0.55.1

* feat: adding missing Czech translation strings

* feat: adding more missing Czech translation strings

* feat: adding more missing Czech translation strings

* feat: adding more missing Czech translation strings

.github/workflows/test-only.yml

@@ -20,10 +20,84 @@ jobs:
           pip install openapi-spec-validator
           python3 -c "from openapi_spec_validator import validate_spec; import yaml; validate_spec(yaml.safe_load(open('docs/api-spec.yaml')))"
 
+  lint-translations:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Check .po files with msgfmt
+        run: |
+          sudo apt-get install -y gettext
+          find changedetectionio/translations -name "*.po" | while read f; do
+            echo "Checking $f"
+            msgfmt --check-format -o /dev/null "$f"
+          done
+      - name: Check translation catalog is up-to-date
+        run: |
+          pip install "$(grep -E '^babel==' requirements.txt)"
+          python setup.py extract_messages
+          python setup.py update_catalog
+          python setup.py compile_catalog
+          # Ignore POT-Creation-Date timestamp lines — they change on every extract_messages run
+          if git diff changedetectionio/translations | grep -v 'POT-Creation-Date' | grep -qE '^[+-][^+-]'; then
+            echo "ERROR: Translation catalog is out of sync. Run: python setup.py extract_messages && python setup.py update_catalog && python setup.py compile_catalog"
+            git diff --stat changedetectionio/translations
+            exit 1
+          fi
+
+  lint-template-i18n:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Check for fragmented gettext calls in templates
+        run: |
+          python3 << 'PYEOF'
+          import re, sys
+          from pathlib import Path
+
+          # Detects adjacent {{ _(...) }} calls on the same line separated only by HTML
+          # tags, whitespace, or non-translating Jinja2 variables — the anti-pattern of
+          # splitting a single sentence across multiple msgids.
+          # See https://github.com/dgtlmoon/changedetection.io/issues/4074 for background.
+          #
+          # The correct fix is to consolidate fragments into one entire-sentence msgid,
+          # injecting dynamic values via %(name)s kwargs — per the GNU gettext manual
+          # sections "Entire sentences" and "No string concatenation". See PR #4076 for
+          # worked examples of each consolidation pattern.
+          #
+          # BASELINE: this limit reflects pre-existing violations present when this check
+          # was introduced. It must only ever go DOWN. Each time you fix a template, lower
+          # the limit by the number of lines fixed so the improvement is locked in.
+          # When the count reaches 0, replace the baseline check with a hard sys.exit(1).
+          BASELINE_LIMIT = 44
+
+          FRAGMENT_RE = re.compile(
+              r'\{\{[^{}]*\b_\s*\([^)]*\)[^{}]*\}\}'
+              r'(?:\s*(?:<[^>]+>|\{\{(?![^}]*\b_\s*\()[^}]*\}\})\s*)+'
+              r'\{\{[^{}]*\b_\s*\([^)]*\)[^{}]*\}\}'
+          )
+
+          violations = []
+          for f in sorted(Path('changedetectionio').rglob('*.html')):
+              for lineno, line in enumerate(f.read_text().splitlines(), 1):
+                  if FRAGMENT_RE.search(line):
+                      violations.append(f"{f}:{lineno}: {line.strip()[:120]}")
+
+          count = len(violations)
+          print(f"Fragmented i18n calls found: {count} (limit: {BASELINE_LIMIT})")
+          for v in violations:
+              print(v)
+
+          if count > BASELINE_LIMIT:
+              print(f"\nERROR: {count} fragmented gettext calls exceed the baseline of {BASELINE_LIMIT}.")
+              print("Consolidate adjacent _() calls into a single entire-sentence msgid.")
+              print("See https://github.com/dgtlmoon/changedetection.io/issues/4074 for patterns.")
+              sys.exit(1)
+          PYEOF
+
   test-application-3-10:
     # Only run on push to master (including PR merges)
     if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-    needs: lint-code
+    needs: [lint-code, lint-translations, lint-template-i18n]
     uses: ./.github/workflows/test-stack-reusable-workflow.yml
     with:
       python-version: '3.10'
@@ -31,7 +105,7 @@ jobs:
 
   test-application-3-11:
     # Always run
-    needs: lint-code
+    needs: [lint-code, lint-translations, lint-template-i18n]
     uses: ./.github/workflows/test-stack-reusable-workflow.yml
     with:
       python-version: '3.11'
@@ -39,7 +113,7 @@ jobs:
   test-application-3-12:
     # Only run on push to master (including PR merges)
     if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-    needs: lint-code
+    needs: [lint-code, lint-translations, lint-template-i18n]
     uses: ./.github/workflows/test-stack-reusable-workflow.yml
     with:
       python-version: '3.12'
@@ -48,7 +122,7 @@ jobs:
   test-application-3-13:
     # Only run on push to master (including PR merges)
     if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-    needs: lint-code
+    needs: [lint-code, lint-translations, lint-template-i18n]
     uses: ./.github/workflows/test-stack-reusable-workflow.yml
     with:
       python-version: '3.13'
@@ -57,7 +131,7 @@ jobs:
 
   test-application-3-14:
     #if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-    needs: lint-code
+    needs: [lint-code, lint-translations, lint-template-i18n]
     uses: ./.github/workflows/test-stack-reusable-workflow.yml
     with:
       python-version: '3.14'

.github/workflows/test-stack-reusable-workflow.yml

@@ -99,11 +99,7 @@ jobs:
 
       - name: Run Unit Tests
         run: |
-          docker run test-changedetectionio bash -c 'python3 -m unittest changedetectionio.tests.unit.test_notification_diff'
-          docker run test-changedetectionio bash -c 'python3 -m unittest changedetectionio.tests.unit.test_watch_model'
-          docker run test-changedetectionio bash -c 'python3 -m unittest changedetectionio.tests.unit.test_jinja2_security'
-          docker run test-changedetectionio bash -c 'python3 -m unittest changedetectionio.tests.unit.test_semver'
-          docker run test-changedetectionio bash -c 'python3 -m unittest changedetectionio.tests.unit.test_html_to_text'         
+          docker run test-changedetectionio bash -c 'cd changedetectionio;pytest tests/unit/ tests/llm/'
 
   # Basic pytest tests with ancillary services
   basic-tests:
@@ -587,6 +583,10 @@ jobs:
         run: |
           docker run  -e EXTRA_PACKAGES=changedetection.io-osint-processor test-changedetectionio bash -c 'cd changedetectionio;pytest -vvv -s  tests/plugins/test_processor.py::test_check_plugin_processor'
 
+      - name: Plugin get_html_head_extras hook injects into base.html
+        run: |
+          docker run test-changedetectionio bash -c 'cd changedetectionio;pytest -vvv -s tests/plugins/test_html_head_extras.py'
+
   # Container startup tests
   container-tests:
     runs-on: ubuntu-latest

README.md

@@ -22,6 +22,20 @@ Ideal for monitoring price changes, content edits, conditional changes and more.
 - Get started watching and receiving website change notifications straight away.
 - See our [tutorials and how-to page for more inspiration](https://changedetection.io/tutorials) 
 
+## AI-powered website change detection — smart alerts and plain-language summaries
+
+Stop drowning in noise. Connect any LLM (OpenAI, Gemini, Anthropic, Ollama and more) and go from _"something changed"_ to _"only the thing you care about changed"_.
+
+**AI change detection rules** — write a plain-English intent once: _"notify me only when the price drops below $50"_, _"alert me when the item comes back in stock"_, _"ignore navigation and footer changes"_. The AI evaluates every detected diff against your intent and silently suppresses everything irrelevant. Fewer false positives, zero noise.
+
+**AI change summaries** — instead of staring at a raw diff, your notification reads _"Price dropped from $89.99 to $67.00"_ or _"3 new products added to the listing"_. Works globally or per-watch, with full control over the prompt.
+
+Works with any model you already pay for — GPT-4o-mini and Gemini Flash handle this well at fractions of a cent per check. Or run it entirely locally with Ollama. Powered by [LiteLLM](https://github.com/BerriAI/litellm), giving you seamless access to [100+ supported providers and models](https://docs.litellm.ai/docs/providers).
+
+[<img src="./docs/LLM-change-summary.jpeg" style="max-width:100%;" alt="AI-powered website change detection — plain language change summaries and smart alert rules"  title="AI website change detection with LLM change summaries and intelligent alert filtering" />](https://changedetection.io?src=github)
+
+_Note: Available in our subscription/hosted service from June 2026_
+
 ### Target specific parts of the webpage using the Visual Selector tool.
 
 Available when connected to a <a href="https://github.com/dgtlmoon/changedetection.io/wiki/Playwright-content-fetcher">playwright content fetcher</a> (included as part of our subscription service)
@@ -308,9 +322,27 @@ I offer commercial support, this software is depended on by network security, ae
 [release-link]: https://github.com/dgtlmoon/changedetection.io/releases
 [docker-link]: https://hub.docker.com/r/dgtlmoon/changedetection.io
 
-## Commercial Licencing
 
-If you are reselling this software either in part or full as part of any commercial arrangement, you must abide by our COMMERCIAL_LICENCE.md found in our code repository, please contact dgtlmoon@gmail.com and contact@changedetection.io .
+## Disclaimer
+
+**This software is provided "as-is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, and non-infringement. In no event shall the authors or copyright holders be liable for any claim, damages, or other liability, whether in an action of contract, tort, or otherwise, arising from, out of, or in connection with the software or the use or other dealings in the software.**
+
+### Website content monitoring
+
+You are solely responsible for ensuring that your use of this software complies with the terms of service, `robots.txt` directives, access policies, and all applicable laws of any website or service you choose to monitor. The authors and contributors of this software accept no liability whatsoever for how you choose to use it or for any consequences arising from that use.
+
+### AI / LLM features
+
+If you choose to enable AI / LLM features, content detected on monitored websites — including page diffs and extracted text — will be transmitted to a third-party AI provider of your choosing, outside of this installation. You are solely responsible for:
+
+- Ensuring such transmission is permitted by the terms of service of every website you monitor.
+- Compliance with all applicable data-protection and privacy laws (including but not limited to GDPR) with respect to any personal data that may appear in monitored content.
+- All API costs and charges levied by your chosen AI provider. This software has no visibility into or control over those charges.
+- Any consequences arising from acting on AI-generated output.
+
+**AI and LLM models are known to hallucinate** — producing plausible-sounding but factually incorrect, incomplete, or entirely fabricated output with apparent confidence. By design, LLMs may also omit or silently truncate relevant information during summarisation. **AI output must never be relied upon as complete or accurate.**
+
+By using this software, and in particular any AI / LLM features, you personally indemnify and hold harmless the author(s), contributor(s), and any associated parties from and against any and all claims, damages, losses, costs, and expenses (including reasonable legal fees) arising out of or in connection with your use of this software.
 
 ## Third-party licenses
 
@@ -320,4 +352,6 @@ changedetectionio.html_tools.elementpath_tostring: Copyright (c), 2018-2021, SIS
 
 Recognition of fantastic contributors to the project
 
+<sub>Developer note: see [translation guide](changedetectionio/translations/README.md) for i18n template patterns and workflow.</sub>
+
 - Constantin Hong https://github.com/Constantin1489

babel.cfg

@@ -1,5 +1,6 @@
 [python: **.py]
-keywords = _:1,_l:1,gettext:1
+keywords = _ _l gettext pgettext:1c,2
 
 [jinja2: **/templates/**.html]
 encoding = utf-8
+keywords = _ _l gettext pgettext:1c,2

changedetectionio/__init__.py

@@ -2,7 +2,7 @@
 
 # Read more https://github.com/dgtlmoon/changedetection.io/wiki
 # Semver means never use .01, or 00. Should be .1.
-__version__ = '0.54.7'
+__version__ = '0.55.1'
 
 from changedetectionio.strtobool import strtobool
 from json.decoder import JSONDecodeError
@@ -400,8 +400,11 @@ def main():
         datastore.data['settings']['application']['all_paused'] = all_paused
         logger.info(f"Setting all watches paused: {all_paused}")
 
+    # Register built-in restock plugins (deferred here to avoid circular imports at module load time)
+    from changedetectionio.pluggy_interface import inject_datastore_into_plugins, register_builtin_restock_plugins
+    register_builtin_restock_plugins()
+
     # Inject datastore into plugins that need access to settings
-    from changedetectionio.pluggy_interface import inject_datastore_into_plugins
     inject_datastore_into_plugins(datastore)
 
     # Step 1: Add URLs with their options (if provided via -u flags)
@@ -624,12 +627,14 @@ def main():
 
     @app.context_processor
     def inject_template_globals():
+        from changedetectionio.llm.evaluator import get_llm_config as _get_llm_config
         return dict(right_sticky="v"+__version__,
                     new_version_available=app.config['NEW_VERSION_AVAILABLE'],
                     has_password=datastore.data['settings']['application']['password'] != False,
                     socket_io_enabled=datastore.data['settings']['application'].get('ui', {}).get('socket_io_enabled', True),
                     all_paused=datastore.data['settings']['application'].get('all_paused', False),
-                    all_muted=datastore.data['settings']['application'].get('all_muted', False)
+                    all_muted=datastore.data['settings']['application'].get('all_muted', False),
+                    llm_configured=bool(_get_llm_config(datastore)),
                     )
 
     # Monitored websites will not receive a Referer header when a user clicks on an outgoing link.

changedetectionio/blueprint/backups/__init__.py

@@ -98,8 +98,8 @@ def construct_blueprint(datastore: ChangeDetectionStore):
     backups_blueprint.register_blueprint(construct_restore_blueprint(datastore))
     backup_threads = []
 
-    @login_optionally_required
     @backups_blueprint.route("/request-backup", methods=['GET'])
+    @login_optionally_required
     def request_backup():
         if any(thread.is_alive() for thread in backup_threads):
             flash(gettext("A backup is already running, check back in a few minutes"), "error")
@@ -141,8 +141,8 @@ def construct_blueprint(datastore: ChangeDetectionStore):
 
         return backup_info
 
-    @login_optionally_required
     @backups_blueprint.route("/download/<string:filename>", methods=['GET'])
+    @login_optionally_required
     def download_backup(filename):
         import re
         filename = filename.strip()
@@ -165,9 +165,9 @@ def construct_blueprint(datastore: ChangeDetectionStore):
         logger.debug(f"Backup download request for '{full_path}'")
         return send_from_directory(os.path.abspath(datastore.datastore_path), filename, as_attachment=True)
 
-    @login_optionally_required
     @backups_blueprint.route("/", methods=['GET'])
     @backups_blueprint.route("/create", methods=['GET'])
+    @login_optionally_required
     def create():
         backups = find_backups()
         output = render_template("backup_create.html",
@@ -176,8 +176,8 @@ def construct_blueprint(datastore: ChangeDetectionStore):
                                  )
         return output
 
-    @login_optionally_required
     @backups_blueprint.route("/remove-backups", methods=['GET'])
+    @login_optionally_required
     def remove_backups():
 
         backup_filepath = os.path.join(datastore.datastore_path, BACKUP_FILENAME_FORMAT.format("*"))

changedetectionio/blueprint/backups/restore.py

@@ -174,8 +174,8 @@ def construct_restore_blueprint(datastore):
     restore_blueprint = Blueprint('restore', __name__, template_folder="templates")
     restore_threads = []
 
-    @login_optionally_required
     @restore_blueprint.route("/restore", methods=['GET'])
+    @login_optionally_required
     def restore():
         form = RestoreForm()
         return render_template("backup_restore.html",
@@ -184,8 +184,8 @@ def construct_restore_blueprint(datastore):
                                max_upload_mb=_MAX_UPLOAD_BYTES // (1024 * 1024),
                                max_decompressed_mb=_MAX_DECOMPRESSED_BYTES // (1024 * 1024))
 
-    @login_optionally_required
     @restore_blueprint.route("/restore/start", methods=['POST'])
+    @login_optionally_required
     def backups_restore_start():
         if any(t.is_alive() for t in restore_threads):
             flash(gettext("A restore is already running, check back in a few minutes"), "error")

changedetectionio/blueprint/backups/templates/backup_restore.html

@@ -20,8 +20,7 @@
                 <p>{{ _('Restore a backup. Must be a .zip backup file created on/after v0.53.1 (new database layout).') }}</p>
                 <p>{{ _('Note: This does not override the main application settings, only watches and groups.') }}</p>
                 <p class="pure-form-message">
-                    {{ _('Max upload size: %(upload)s MB &nbsp;·&nbsp; Max decompressed size: %(decomp)s MB',
-                         upload=max_upload_mb, decomp=max_decompressed_mb) }}
+                    {{ _('Max upload size: %(upload)s MB, Max decompressed size: %(decomp)s MB', upload=max_upload_mb, decomp=max_decompressed_mb) }}
                 </p>
 
                 <form class="pure-form pure-form-stacked settings"

changedetectionio/blueprint/browser_steps/__init__.py

@@ -268,8 +268,8 @@ def construct_blueprint(datastore: ChangeDetectionStore):
         return browsersteps_start_session
 
 
-    @login_optionally_required
     @browser_steps_blueprint.route("/browsersteps_start_session", methods=['GET'])
+    @login_optionally_required
     def browsersteps_start_session():
         # A new session was requested, return sessionID
         import uuid
@@ -304,8 +304,8 @@ def construct_blueprint(datastore: ChangeDetectionStore):
         logger.debug("Starting connection with playwright - done")
         return {'browsersteps_session_id': browsersteps_session_id}
 
-    @login_optionally_required
     @browser_steps_blueprint.route("/browsersteps_image", methods=['GET'])
+    @login_optionally_required
     def browser_steps_fetch_screenshot_image():
         from flask import (
             make_response,
@@ -330,8 +330,8 @@ def construct_blueprint(datastore: ChangeDetectionStore):
             return make_response('Unable to fetch image, is the URL correct? does the watch exist? does the step_type-n.jpeg exist?', 401)
 
     # A request for an action was received
-    @login_optionally_required
     @browser_steps_blueprint.route("/browsersteps_update", methods=['POST'])
+    @login_optionally_required
     def browsersteps_ui_update():
         import base64
 

changedetectionio/blueprint/imports/importer.py

@@ -160,8 +160,7 @@ class import_xlsx_wachete(Importer):
             flash(gettext("Unable to read export XLSX file, something wrong with the file?"), 'error')
             return
 
-        row_id = 2
-        for row in wb.active.iter_rows(min_row=row_id):
+        for row_id, row in enumerate(wb.active.iter_rows(min_row=2), start=2):
             try:
                 extras = {}
                 data = {}
@@ -212,8 +211,6 @@ class import_xlsx_wachete(Importer):
             except Exception as e:
                 logger.error(e)
                 flash(gettext("Error processing row number {}, check all cell data types are correct, row was skipped.").format(row_id), 'error')
-            else:
-                row_id += 1
 
         flash(gettext("{} imported from Wachete .xlsx in {:.2f}s").format(len(self.new_uuids), time.time() - now))
 
@@ -241,10 +238,10 @@ class import_xlsx_custom(Importer):
 
         # @todo cehck atleast 2 rows, same in other method
         from changedetectionio.forms import validate_url
-        row_i = 1
+        row_i = 0
 
         try:
-            for row in wb.active.iter_rows():
+            for row_i, row in enumerate(wb.active.iter_rows(), start=1):
                 url = None
                 tags = None
                 extras = {}
@@ -295,7 +292,5 @@ class import_xlsx_custom(Importer):
         except Exception as e:
             logger.error(e)
             flash(gettext("Error processing row number {}, check all cell data types are correct, row was skipped.").format(row_i), 'error')
-        else:
-            row_i += 1
 
         flash(gettext("{} imported from custom .xlsx in {:.2f}s").format(len(self.new_uuids), time.time() - now))

changedetectionio/blueprint/imports/templates/import.html

@@ -9,6 +9,7 @@
             <li class="tab" id=""><a href="#url-list">{{ _('URL List') }}</a></li>
             <li class="tab"><a href="#distill-io">{{ _('Distill.io') }}</a></li>
             <li class="tab"><a href="#xlsx">{{ _('.XLSX & Wachete') }}</a></li>
+            <li class="tab"><a href="{{url_for('backups.restore.restore')}}">{{ _('Backup Restore') }}</a></li>
         </ul>
     </div>
 
@@ -24,7 +25,7 @@
                 <div class="pure-control-group">
                         {{ _('Enter one URL per line, and optionally add tags for each URL after a space, delineated by comma (,):') }}
                         <br>
-                        <p><strong>{{ _('Example:') }}  </strong><code>https://example.com tag1, tag2, last tag</code></p>
+                        <p><strong>{{ _('Example') }}:  </strong><code>https://example.com tag1, tag2, last tag</code></p>
                         {{ _('URLs which do not pass validation will stay in the textarea.') }}
                 </div>
                 {{ render_field(form.processor, class="processor") }}
@@ -44,7 +45,7 @@
             <div class="tab-pane-inner" id="distill-io">
                     <div class="pure-control-group">
                         {{ _('Copy and Paste your Distill.io watch \'export\' file, this should be a JSON file.') }}<br>
-                        {{ _('This is') }} <i>{{ _('experimental') }}</i>, {{ _('supported fields are') }} <code>name</code>, <code>uri</code>, <code>tags</code>, <code>config:selections</code>, {{ _('the rest (including') }} <code>schedule</code>) {{ _('are ignored.') }}
+                        {{ _('This is <i>experimental</i>, supported fields are <code>name</code>, <code>uri</code>, <code>tags</code>, <code>config:selections</code>, the rest (including <code>schedule</code>) are ignored.')|safe }}
                         <br>
                         <p>
                         {{ _('How to export?') }} <a href="https://distill.io/docs/web-monitor/how-export-and-import-monitors/">https://distill.io/docs/web-monitor/how-export-and-import-monitors/</a><br>

changedetectionio/blueprint/settings/__init__.py

@@ -13,7 +13,9 @@ from changedetectionio.auth_decorator import login_optionally_required
 
 
 def construct_blueprint(datastore: ChangeDetectionStore):
+    from changedetectionio.blueprint.settings.llm import construct_llm_blueprint
     settings_blueprint = Blueprint('settings', __name__, template_folder="templates")
+    settings_blueprint.register_blueprint(construct_llm_blueprint(datastore), url_prefix='/llm')
 
     @settings_blueprint.route("", methods=['GET', "POST"])
     @login_optionally_required
@@ -27,6 +29,23 @@ def construct_blueprint(datastore: ChangeDetectionStore):
 
 
         default = deepcopy(datastore.data['settings'])
+
+        # Pre-populate LLM sub-form fields from stored config (text fields only —
+        # PasswordField for api_key is intentionally left blank on GET).
+        _stored_llm = datastore.data['settings']['application'].get('llm') or {}
+        default['llm'] = {
+            'llm_model':                         _stored_llm.get('model', ''),
+            'llm_api_base':                      _stored_llm.get('api_base', ''),
+            'llm_change_summary_default':        datastore.data['settings']['application'].get('llm_change_summary_default', ''),
+            'llm_override_diff_with_summary':    datastore.data['settings']['application'].get('llm_override_diff_with_summary', True),
+            'llm_restock_use_fallback_extract':  datastore.data['settings']['application'].get('llm_restock_use_fallback_extract', True),
+            'llm_budget_action':                 datastore.data['settings']['application'].get('llm_budget_action', 'skip_llm'),
+            'llm_thinking_budget':               str(datastore.data['settings']['application'].get('llm_thinking_budget', 0)),
+            'llm_max_summary_tokens':            str(datastore.data['settings']['application'].get('llm_max_summary_tokens', 3000)),
+            'llm_token_budget_month':            _stored_llm.get('token_budget_month', 0),
+            'llm_max_input_chars':               _stored_llm.get('max_input_chars', 0),
+        }
+
         if datastore.proxy_list is not None:
             available_proxies = list(datastore.proxy_list.keys())
             # When enabled
@@ -76,6 +95,73 @@ def construct_blueprint(datastore: ChangeDetectionStore):
 
                 datastore.data['settings']['application'].update(app_update)
 
+                # Save LLM config separately under settings.application.llm.
+                # Token counters (tokens_total_cumulative, tokens_this_month, tokens_month_key)
+                # are system-managed and must never be overwritten by form submissions.
+                _LLM_PROTECTED_FIELDS = {
+                    'tokens_total_cumulative', 'tokens_this_month', 'tokens_month_key',
+                    'cost_usd_total_cumulative', 'cost_usd_this_month',
+                }
+                existing_llm = datastore.data['settings']['application'].get('llm') or {}
+                preserved_counters = {k: v for k, v in existing_llm.items() if k in _LLM_PROTECTED_FIELDS}
+
+                llm_data = form.data.get('llm') or {}
+
+                # PasswordField never re-populates its value on GET, so the submitted value
+                # is only non-empty when the user explicitly typed a new key.
+                # If blank, preserve the existing key so a settings save doesn't accidentally clear it.
+                submitted_api_key = (llm_data.get('llm_api_key') or '').strip()
+                effective_api_key = submitted_api_key if submitted_api_key else existing_llm.get('api_key', '')
+
+                # Application-level LLM settings (survive provider changes)
+                datastore.data['settings']['application']['llm_change_summary_default'] = (
+                    llm_data.get('llm_change_summary_default') or ''
+                ).strip()
+                datastore.data['settings']['application']['llm_override_diff_with_summary'] = (
+                    bool(llm_data.get('llm_override_diff_with_summary', True))
+                )
+                datastore.data['settings']['application']['llm_restock_use_fallback_extract'] = (
+                    bool(llm_data.get('llm_restock_use_fallback_extract', True))
+                )
+                datastore.data['settings']['application']['llm_budget_action'] = (
+                    llm_data.get('llm_budget_action') or 'skip_llm'
+                )
+                datastore.data['settings']['application']['llm_thinking_budget'] = (
+                    int(llm_data.get('llm_thinking_budget') or 0)
+                )
+                datastore.data['settings']['application']['llm_max_summary_tokens'] = (
+                    int(llm_data.get('llm_max_summary_tokens') or 3000)
+                )
+
+                # Monthly token budget — only save if env var is not set
+                import os as _os
+                if not _os.getenv('LLM_TOKEN_BUDGET_MONTH', '').strip():
+                    _budget = llm_data.get('llm_token_budget_month') or 0
+                    existing_llm['token_budget_month'] = int(_budget) if _budget else 0
+
+                # Max input chars — only save if env var is not set
+                if not _os.getenv('LLM_MAX_INPUT_CHARS', '').strip():
+                    _max_chars = llm_data.get('llm_max_input_chars') or 0
+                    existing_llm['max_input_chars'] = int(_max_chars) if _max_chars else 0
+
+                llm_config = {
+                    'model': (llm_data.get('llm_model') or '').strip(),
+                    'api_key': effective_api_key,
+                    'api_base': (llm_data.get('llm_api_base') or '').strip(),
+                    'token_budget_month': existing_llm.get('token_budget_month', 0),
+                    'max_input_chars': existing_llm.get('max_input_chars', 0),
+                    **preserved_counters,
+                }
+                # Only store if a model is set
+                if llm_config['model']:
+                    datastore.data['settings']['application']['llm'] = llm_config
+                else:
+                    # Remove model config but retain counters for historical record
+                    if preserved_counters:
+                        datastore.data['settings']['application']['llm'] = preserved_counters
+                    else:
+                        datastore.data['settings']['application'].pop('llm', None)
+
                 # Handle dynamic worker count adjustment
                 old_worker_count = datastore.data['settings']['requests'].get('workers', 1)
                 new_worker_count = form.data['requests'].get('workers', 1)
@@ -164,9 +250,34 @@ def construct_blueprint(datastore: ChangeDetectionStore):
             # Instantiate the form with existing settings
             plugin_forms[plugin_id] = form_class(data=settings)
 
+        from changedetectionio.llm.evaluator import (
+            get_llm_config as _get_llm_cfg,
+            llm_configured_via_env,
+            get_global_token_budget_month,
+        )
+        llm_config = _get_llm_cfg(datastore) or {}
+        llm_env_configured = llm_configured_via_env()
+        llm_stored = datastore.data['settings']['application'].get('llm') or {}
+        llm_token_budget_month = get_global_token_budget_month(datastore)
+        llm_token_budget_month_env = get_global_token_budget_month()  # env var only, for readonly logic
+        _max_input_chars_env_str = os.getenv('LLM_MAX_INPUT_CHARS', '').strip()
+        llm_max_input_chars_env = int(_max_input_chars_env_str) if _max_input_chars_env_str.isdigit() else 0
+        from changedetectionio.llm.evaluator import _get_max_input_chars, _DEFAULT_MAX_INPUT_CHARS
+        llm_effective_max_input_chars = _get_max_input_chars(datastore)
+        # Cost display: only when user configured their own key (not hosted/operator-managed)
+        llm_show_costs = not llm_env_configured
+
         output = render_template("settings.html",
                                 active_plugins=active_plugins,
                                 api_key=datastore.data['settings']['application'].get('api_access_token'),
+                                llm_config=llm_config,
+                                llm_env_configured=llm_env_configured,
+                                llm_stored=llm_stored,
+                                llm_token_budget_month=llm_token_budget_month,
+                                llm_token_budget_month_env=llm_token_budget_month_env,
+                                llm_max_input_chars_env=llm_max_input_chars_env,
+                                llm_effective_max_input_chars=llm_effective_max_input_chars,
+                                llm_show_costs=llm_show_costs,
                                 python_version=python_version,
                                 uptime_seconds=uptime_seconds,
                                 available_timezones=sorted(available_timezones()),

changedetectionio/blueprint/settings/llm.py

@@ -0,0 +1,128 @@
+import os
+
+from flask import Blueprint, jsonify, redirect, url_for, flash
+from flask_babel import gettext
+from loguru import logger
+
+from changedetectionio.store import ChangeDetectionStore
+from changedetectionio.auth_decorator import login_optionally_required
+
+
+def construct_llm_blueprint(datastore: ChangeDetectionStore):
+    llm_blueprint = Blueprint('llm', __name__)
+
+    @llm_blueprint.route("/models", methods=['GET'])
+    @login_optionally_required
+    def llm_get_models():
+        from flask import request
+        provider = request.args.get('provider', '').strip()
+        api_key  = request.args.get('api_key',  '').strip()
+        api_base = request.args.get('api_base', '').strip()
+
+        logger.debug(f"LLM model list requested for provider={provider!r} api_base={api_base!r}")
+
+        if not provider:
+            logger.debug("LLM model list: no provider specified, returning 400")
+            return jsonify({'models': [], 'error': 'No provider specified'}), 400
+
+        # Fall back to the stored key if the user hasn't typed one yet
+        if not api_key:
+            api_key = (datastore.data['settings']['application'].get('llm') or {}).get('api_key', '')
+            logger.debug("LLM model list: no api_key in request, using stored key")
+
+        _PREFIXES = {'gemini': 'gemini/', 'ollama': 'ollama/', 'openrouter': 'openrouter/'}
+        prefix = _PREFIXES.get(provider, '')
+
+        try:
+            import litellm
+            logger.debug(f"LLM model list: calling litellm.get_valid_models provider={provider!r} api_base={api_base!r}")
+            raw = litellm.get_valid_models(
+                check_provider_endpoint=True,
+                custom_llm_provider=provider,
+                api_key=api_key or None,
+                api_base=api_base or None,
+            ) or []
+            models = sorted({(m if m.startswith(prefix) else prefix + m) for m in raw})
+            logger.debug(f"LLM model list: got {len(models)} models for provider={provider!r}")
+            return jsonify({'models': models, 'error': None})
+        except Exception as e:
+            logger.error(f"LLM model list failed for provider={provider!r}: {e}")
+            logger.exception("LLM model list full traceback:")
+            return jsonify({'models': [], 'error': str(e)}), 400
+
+    @llm_blueprint.route("/test", methods=['GET'])
+    @login_optionally_required
+    def llm_test():
+        from changedetectionio.llm.client import completion
+
+        llm_cfg = datastore.data['settings']['application'].get('llm') or {}
+        model    = llm_cfg.get('model', '').strip()
+        api_base = llm_cfg.get('api_base', '') or ''
+
+        logger.debug(f"LLM connection test requested: model={model!r} api_base={api_base!r}")
+
+        if not model:
+            logger.error("LLM connection test failed: no model configured in datastore")
+            return jsonify({'ok': False, 'error': 'No model configured.'}), 400
+
+        try:
+            logger.debug(f"LLM connection test: sending test prompt to model={model!r}")
+            text, total_tokens, input_tokens, output_tokens = completion(
+                model=model,
+                messages=[{'role': 'user', 'content':
+                    'Reply with exactly five words confirming you are ready.'}],
+                api_key=llm_cfg.get('api_key') or None,
+                api_base=api_base or None,
+                timeout=20,
+                max_tokens=200,
+            )
+            reply = text.strip()
+            if not reply:
+                logger.warning(
+                    f"LLM connection test: model={model!r} responded but returned empty content "
+                    f"tokens={total_tokens} (in={input_tokens} out={output_tokens}) — "
+                    f"check finish_reason in client debug log above"
+                )
+                return jsonify({'ok': False, 'error': 'Model responded but returned empty content — check server logs.'}), 400
+
+            logger.success(
+                f"LLM connection test OK: model={model!r} "
+                f"tokens={total_tokens} (in={input_tokens} out={output_tokens}) "
+                f"reply={reply!r}"
+            )
+            return jsonify({'ok': True, 'text': reply, 'tokens': total_tokens})
+
+        except Exception as e:
+            logger.error(f"LLM connection test FAILED: model={model!r} api_base={api_base!r} error={e}")
+            logger.exception("LLM connection test full traceback:")
+            return jsonify({'ok': False, 'error': str(e)}), 400
+
+    @llm_blueprint.route("/clear", methods=['GET'])
+    @login_optionally_required
+    def llm_clear():
+        logger.debug("LLM configuration cleared by user")
+        datastore.data['settings']['application'].pop('llm', None)
+        datastore.commit()
+        flash(gettext("AI / LLM configuration removed."), 'notice')
+        return redirect(url_for('settings.settings_page') + '#ai')
+
+    @llm_blueprint.route("/clear-summary-cache", methods=['GET'])
+    @login_optionally_required
+    def llm_clear_summary_cache():
+        import glob
+        count = 0
+        for watch in datastore.data['watching'].values():
+            if not watch.data_dir:
+                continue
+            for f in glob.glob(os.path.join(watch.data_dir, 'change-summary-*.txt')):
+                try:
+                    os.remove(f)
+                    logger.info(f"LLM summary cache removed: {f}")
+                    count += 1
+                except OSError as e:
+                    logger.warning(f"Could not remove LLM summary cache file {f}: {e}")
+        logger.info(f"LLM summary cache cleared: {count} file(s) removed")
+        flash(gettext("AI summary cache cleared (%(n)s file(s) removed).", n=count), 'notice')
+        return redirect(url_for('settings.settings_page') + '#ai')
+
+    return llm_blueprint

changedetectionio/blueprint/settings/templates/settings.html

@@ -9,6 +9,7 @@
     const email_notification_prefix=JSON.parse('{{emailprefix|tojson}}');
 {% endif %}
 </script>
+<script src="{{url_for('static_content', group='js', filename='modal.js')}}"></script>
 <script src="{{url_for('static_content', group='js', filename='tabs.js')}}" defer></script>
 <script src="{{url_for('static_content', group='js', filename='plugins.js')}}" defer></script>
 <script src="{{url_for('static_content', group='js', filename='notifications.js')}}" defer></script>
@@ -33,6 +34,7 @@
             <li class="tab"><a href="#plugin-{{ tab.plugin_id }}">{{ tab.tab_label }}</a></li>
                 {% endfor %}
             {% endif %}
+            <li class="tab"><a href="#ai">{{ _('AI / LLM') }}</a></li>
             <li class="tab"><a href="#info">{{ _('Info') }}</a></li>
         </ul>
     </div>
@@ -56,7 +58,7 @@
                         {{ render_field(form.application.form.filter_failure_notification_threshold_attempts, class="filter_failure_notification_threshold_attempts") }}
                         <span class="pure-form-message-inline">{{ _('After this many consecutive times that the CSS/xPath filter is missing, send a notification') }}
                             <br>
-                        {{ _('Set to') }} <strong>0</strong> {{ _('to disable') }}
+                        {{ _('Set to <strong>0</strong> to disable')|safe }}
                         </span>
                     </div>
                     <div class="pure-control-group">
@@ -118,15 +120,15 @@
                 <div class="pure-control-group inline-radio">
                     {{ render_field(form.application.form.fetch_backend, class="fetch-backend") }}
                     <span class="pure-form-message-inline">
-                        <p>{{ _('Use the') }} <strong>{{ _('Basic') }}</strong> {{ _('method (default) where your watched sites don\'t need Javascript to render.') }}</p>
-                        <p>{{ _('The') }} <strong>{{ _('Chrome/Javascript') }}</strong> {{ _('method requires a network connection to a running WebDriver+Chrome server, set by the ENV var') }} 'WEBDRIVER_URL'. </p>
+                        <p>{{ _('Use the <strong>Basic</strong> method (default) where your watched sites don\'t need Javascript to render.')|safe }}</p>
+                        <p>{{ _('The <strong>Chrome/Javascript</strong> method requires a network connection to a running WebDriver+Chrome server, set by the ENV var \'WEBDRIVER_URL\'.')|safe }}</p>
                     </span>
                 </div>
                 <fieldset class="pure-group" id="webdriver-override-options" data-visible-for="application-fetch_backend=html_webdriver">
                     <div class="pure-form-message-inline">
                         <strong>{{ _('If you\'re having trouble waiting for the page to be fully rendered (text missing etc), try increasing the \'wait\' time here.') }}</strong>
                         <br>
-                        {{ _('This will wait') }} <i>n</i> {{ _('seconds before extracting the text.') }}
+                        {{ _('This will wait <i>n</i> seconds before extracting the text.')|safe }}
                     </div>
                     <div class="pure-control-group">
                         {{ render_field(form.application.form.webdriver_delay) }}
@@ -195,7 +197,7 @@ nav
                     <span class="pure-form-message-inline">{{ _('Note: This is applied globally in addition to the per-watch rules.') }}</span><br>
                     <span class="pure-form-message-inline">
                         <ul>
-                            <li>{{ _('Matching text will be') }} <strong>{{ _('ignored') }}</strong> {{ _('in the text snapshot (you can still see it but it wont trigger a change)') }}</li>
+                            <li>{{ _('Matching text will be ignored in the text snapshot (you can still see it but it wont trigger a change)') }}</li>
                             <li>{{ _('Note: This is applied globally in addition to the per-watch rules.') }}</li>
                             <li>{{ _('Each line processed separately, any line matching will be ignored (removed before creating the checksum)') }}</li>
                             <li>{{ _('Regular Expression support, wrap the entire line in forward slash') }} <code>/regex/</code></li>
@@ -263,7 +265,7 @@ nav
                     </div>
                     <div>
                        {{ render_field(form.application.form.rss_template_override) }}
-                        {{ show_token_placeholders(extra_notification_token_placeholder_info=extra_notification_token_placeholder_info, suffix="-rss") }}
+                        {{ show_token_placeholders(extra_notification_token_placeholder_info=extra_notification_token_placeholder_info, suffix="-rss", settings_application=settings_application) }}
                     </div>
                 </div>
                 <br>
@@ -392,6 +394,7 @@ nav
             </div>
                 {% endfor %}
             {% endif %}
+            {% include 'settings_llm_tab.html' %}
             <div class="tab-pane-inner" id="info">
                 <p><strong>{{ _('Uptime:') }}</strong> {{ uptime_seconds|format_duration }}</p>
                 <p><strong>{{ _('Python version:') }}</strong> {{ python_version }}</p>

changedetectionio/blueprint/settings/templates/settings_llm_tab.html

@@ -0,0 +1,528 @@
+{% from '_helpers.html' import render_field %}
+{% from '_stab.html' import stab_shell, stab_pane %}
+{#
+  AI / LLM settings tab content — included from settings.html.
+  Requires template context: form, llm_config, llm_env_configured
+#}
+<div class="tab-pane-inner" id="ai">
+<script src="{{ url_for('static_content', group='js', filename='sub-tabs.js') }}"></script>
+
+{# TRANSLATORS: 'Usage' here means token consumption/cost stats for the AI provider, not a how-to guide #}
+{% set _usage_label = pgettext('AI usage stats', 'Usage') %}
+{% call stab_shell('ai-settings', [
+    {'id': 'overview',  'label': _('Overview'),  'icon': '✦'},
+    {'id': 'provider',  'label': _('Provider'),  'icon': '⚙'},
+    {'id': 'prompts',   'label': _('Prompts'),   'icon': '≡'},
+    {'id': 'behaviour', 'label': _('Behaviour'), 'icon': '⚑'},
+    {'id': 'usage',     'label': _usage_label,   'icon': '$'},
+]) %}
+
+  {# ── Overview ──────────────────────────────────────────────────────────── #}
+  {% call stab_pane('overview') %}
+  <div class="stab-overview-hero">
+    <h3><span class="stab-overview-glyph">✦</span> {{ _('AI-powered change monitoring') }}</h3>
+    <p>{{ _('Connect an LLM to move from "something changed" to "only the thing you care about changed".') }}</p>
+  </div>
+
+  <div class="stab-overview-features">
+    <div class="stab-overview-feature">
+      <div class="stab-overview-icon">⊞</div>
+      <div class="stab-overview-text">
+        <strong>{{ _('Intent filtering') }}</strong>
+        <p>{{ _('Each watch or tag can carry a plain-text intent — %(ex1)s or %(ex2)s. On every detected change the AI evaluates the diff against it and suppresses irrelevant noise.', ex1='<strong>"notify me only when the price drops"</strong>', ex2='<strong>"alert when the item goes out of stock"</strong>') | safe }}</p>
+      </div>
+    </div>
+    <div class="stab-overview-feature">
+      <div class="stab-overview-icon">≡</div>
+      <div class="stab-overview-text">
+        <strong>{{ _('AI Change Summary') }}</strong>
+        <p>{{ _('Instead of raw diffs, receive plain-language summaries in notifications — %(ex1)s or %(ex2)s. Set a global default prompt here, or override per watch or tag.', ex1='<strong>"Price dropped from $89 to $67"</strong>', ex2='<strong>"3 new items added to the listing"</strong>') | safe }}</p>
+      </div>
+    </div>
+    <div class="stab-overview-feature">
+      <div class="stab-overview-icon">≈</div>
+      <div class="stab-overview-text">
+        <strong>{{ _('Minimal cost') }}</strong>
+        <p>{{ _('The AI sees only a unified diff of what changed — never full page HTML. Low-cost models like %(gpt)s or %(gemini)s handle this well, typically fractions of a cent per check.',
+              gpt='<a href="https://platform.openai.com/api-keys" target="_blank" rel="noopener">gpt-4o-mini</a>',
+              gemini='<a href="https://aistudio.google.com/apikey" target="_blank" rel="noopener">Gemini Flash</a>') | safe }}</p>
+      </div>
+    </div>
+  </div>
+
+  <div class="stab-overview-cta">
+    {% if llm_config and llm_config.get('model') %}
+    <span class="stab-configured-badge">&#10003; {{ _('AI / LLM configured:') }} {{ llm_config.get('model') }}</span>
+    {% else %}
+    <button type="button" class="pure-button pure-button-primary" data-stab-goto="provider">
+      ⚙ {{ _('Configure AI Provider') }} &rarr;
+    </button>
+    {% endif %}
+  </div>
+  {% endcall %}
+
+  {# ── Provider ──────────────────────────────────────────────────────────── #}
+  {% call stab_pane('provider') %}
+  <p class="stab-section-title">{{ _('AI Provider') }}</p>
+
+  {% if not llm_env_configured and not (llm_config and llm_config.get('model')) %}
+  <div class="stab-overview-disclaimer">
+    <div class="stab-disclaimer-icon">⚠</div>
+    <div class="stab-disclaimer-body">
+      <strong>{{ _('Third-party data transfer — please read') }}</strong>
+      <p>{{ _('When AI features are active, change data from the websites you monitor — including page diffs and extracted text — is sent to an external AI provider of your choice.') }}</p>
+      <ul>
+        <li>{{ _('You are solely responsible for ensuring this complies with the terms of service of each website you monitor.') }}</li>
+        <li>{{ _("You are solely responsible for compliance with applicable data-protection laws (e.g. GDPR) regarding any personal data that may appear in monitored content.") }}</li>
+        <li>{{ _('API costs charged by your chosen provider are your own responsibility; this software has no visibility into or control over those charges.') }}</li>
+        <li>{{ _('AI / LLM models are known to hallucinate — producing plausible-sounding but factually incorrect or entirely fabricated output with apparent confidence — and by design may omit or truncate relevant data during summarisation. AI output must never be relied upon as complete or accurate. This software is provided as-is with no warranty of any kind.') }}</li>
+        <li>{{ _('By enabling AI features you personally indemnify and hold harmless the creator(s) and contributor(s) of this software from any claims, damages, or liability arising from this data transfer or your use of AI features.') }}</li>
+      </ul>
+      <label class="stab-disclaimer-check">
+        <input type="checkbox" id="llm-disclaimer-accept" onchange="llmDisclaimerToggle(this)">
+        <span>{{ _('I have read and understood the above. I accept full responsibility and indemnify the creator(s) of this software.') }}</span>
+      </label>
+    </div>
+  </div>
+  <div id="llm-provider-fields" style="display:none">
+  {% endif %}
+
+  {% if llm_env_configured %}
+  <div class="inline-warning" style="margin-bottom: 1em;">
+    <img class="inline-warning-icon" src="{{ url_for('static_content', group='images', filename='notice.svg') }}" alt="{{ _('Note') }}">
+    {{ _('AI / LLM is configured via environment variables (<code>LLM_MODEL=%(model)s</code>%(api_base)s). Remove the <code>LLM_MODEL</code> environment variable to configure via this form instead.',
+         model=llm_config.get('model', '')|e,
+         api_base=(', <code>LLM_API_BASE=' ~ (llm_config.get('api_base')|e) ~ '</code>') if llm_config.get('api_base') else '') | safe }}
+  </div>
+  {% else %}
+
+  <div class="pure-control-group">
+    <label for="llm-provider">{{ _('Provider') }}</label>
+    <select id="llm-provider" onchange="llmOnProviderChange(this.value)">
+      <option value="">— {{ _('select a provider') }} —</option>
+      <optgroup label="OpenAI">
+        <option value="openai">OpenAI</option>
+      </optgroup>
+      <optgroup label="Anthropic">
+        <option value="anthropic">Anthropic</option>
+      </optgroup>
+      <optgroup label="Google">
+        <option value="gemini">Google (Gemini)</option>
+      </optgroup>
+      <optgroup label="{{ _('Local / Self-hosted') }}">
+        <option value="ollama">Ollama (local)</option>
+      </optgroup>
+      <optgroup label="OpenRouter">
+        <option value="openrouter">OpenRouter (200+ models)</option>
+      </optgroup>
+    </select>
+  </div>
+
+  <div class="pure-control-group">
+    {{ render_field(form.llm.form.llm_api_key) }}
+    <span class="pure-form-message-inline" id="llm-key-hint"></span>
+  </div>
+  <div class="pure-control-group" id="llm-base-group" style="display:none">
+    {{ render_field(form.llm.form.llm_api_base) }}
+    <span class="pure-form-message-inline">{{ _('Only needed for Ollama or custom/self-hosted endpoints. Leave blank for cloud providers.') }}</span>
+  </div>
+
+  <div class="pure-control-group" id="llm-fetch-group" style="display:none">
+    <label></label>
+    <button type="button" id="llm-fetch-btn" class="pure-button button-xsmall" onclick="llmFetchModels()"
+            style="background:#27ae60;color:#fff;border:none;">
+      &#8635; {{ _('Load available models') }}
+    </button>
+    <span id="llm-fetch-status" style="margin-left:.6em;font-size:.85em;color:#888;"></span>
+  </div>
+
+  <div class="pure-control-group" id="llm-model-select-group" style="display:none">
+    <label for="llm-model-select">{{ _('Available models') }}</label>
+    <select id="llm-model-select" class="pure-input-1-2" onchange="llmOnModelPick(this.value)">
+      <option value="">— {{ _('choose a model') }} —</option>
+    </select>
+  </div>
+
+  <div class="pure-control-group">
+    {{ render_field(form.llm.form.llm_model,
+                    readonly=True,
+                    placeholder=_("Enter API key and click 'Load available models'")) }}
+  </div>
+
+  {% if llm_config and llm_config.get('model') %}
+  <div class="pure-control-group">
+    <label></label>
+    <span style="color:#4a7c59;font-weight:bold;">
+      &#10003; {{ _('AI / LLM configured:') }} {{ llm_config.get('model') }}
+    </span>
+    &nbsp;
+    <a href="{{ url_for('settings.llm.llm_clear') }}"
+       class="pure-button button-xsmall"
+       style="background:#c0392b;color:#fff;"
+       data-requires-confirm
+       data-confirm-type="danger"
+       data-confirm-title="{{ _('Remove AI / LLM configuration?') }}"
+       data-confirm-message="<p>{{ _('This will remove your saved AI provider, model, and API key.') }}</p>"
+       data-confirm-button="{{ _('Remove') }}"
+       data-cancel-button="{{ _('Cancel') }}">
+      &#10005; {{ _('Remove') }}
+    </a>
+    &nbsp;
+    <button type="button" id="llm-test-btn" class="pure-button button-xsmall" onclick="llmRunTest()"
+            style="background:#2980b9;color:#fff;border:none;">
+      &#9654; {{ _('Test connection') }}
+    </button>
+  </div>
+  <div id="llm-test-result" style="display:none; margin-top:0.6em; padding:0.6em 0.85em; border-radius:5px; font-size:0.88em; line-height:1.45;"></div>
+  {% endif %}
+
+  <p class="pure-form-message-inline" style="margin-top:0.5em;">
+    {{ _("Your API key is stored locally and sent only to your chosen provider. On each detected change, the watch's diff and extracted text are sent to the LLM — no full page HTML.") }}
+  </p>
+
+  <div class="pure-control-group" style="margin-top:1.2em; padding-top:1em; border-top:1px solid rgba(128,128,128,0.15);">
+    <label style="color:#888; font-size:0.85em;">{{ _('Cache') }}</label>
+    <a href="{{ url_for('settings.llm.llm_clear_summary_cache') }}"
+       class="pure-button button-xsmall"
+       style="background:#7f8c8d;color:#fff;"
+       data-requires-confirm
+       data-confirm-type="warning"
+       data-confirm-title="{{ _('Clear all summary cache?') }}"
+       data-confirm-message="<p>{{ _('This will remove all cached AI change summaries across all watches.') }}</p><p>{{ _('They will be regenerated on the next check.') }}</p>"
+       data-confirm-button="{{ _('Clear cache') }}"
+       data-cancel-button="{{ _('Cancel') }}">
+      &#10005; {{ _('Clear all summary cache') }}
+    </a>
+    <span class="pure-form-message-inline">{{ _('Removes all cached AI change summaries across all watches. They will be regenerated on the next check.') }}</span>
+  </div>
+  {% endif %}{# llm_env_configured #}
+
+  {% if not llm_env_configured and not (llm_config and llm_config.get('model')) %}
+  </div>{# llm-provider-fields #}
+  {% endif %}
+  {% endcall %}
+
+  {# ── Prompts ───────────────────────────────────────────────────────────── #}
+  {% call stab_pane('prompts') %}
+  <p class="stab-section-title">{{ _('Default AI Change Summary') }}</p>
+
+  <div class="pure-control-group">
+    {{ render_field(form.llm.form.llm_change_summary_default) }}
+    <span class="pure-form-message-inline">
+      {{ _('Used for all watches unless overridden by the watch or its tag/group.') }}
+      &nbsp;<a href="#" class="pure-button button-small" onclick="var t=document.getElementById('llm-llm_change_summary_default'); if(!t.value && t.placeholder) t.value=t.placeholder; return false;">{{ _('Modify default prompt') }}</a>
+    </span>
+  </div>
+
+  {% endcall %}
+
+  {# ── Behaviour ─────────────────────────────────────────────────────────── #}
+  {% call stab_pane('behaviour') %}
+  <p class="stab-section-title">{{ _('Behaviour') }}</p>
+
+  {% if llm_config and llm_config.get('model') %}
+  <div class="pure-control-group">
+    <label></label>
+    {{ form.llm.form.llm_override_diff_with_summary() }}
+    <label for="{{ form.llm.form.llm_override_diff_with_summary.id }}" style="display:inline; font-weight:normal;">
+      {{ form.llm.form.llm_override_diff_with_summary.label.text }}
+    </label>
+    <span class="pure-form-message-inline">
+      {{ _('When enabled, the <code>%(diff)s</code> notification token shows the AI summary instead of the raw diff. Use <code>%(raw_diff)s</code> to always get the original.',
+           diff='{{diff}}', raw_diff='{{raw_diff}}') | safe }}
+    </span>
+  </div>
+
+  <div class="pure-control-group">
+    <label></label>
+    {{ form.llm.form.llm_restock_use_fallback_extract() }}
+    <label for="{{ form.llm.form.llm_restock_use_fallback_extract.id }}" style="display:inline; font-weight:normal;">
+      {{ form.llm.form.llm_restock_use_fallback_extract.label.text }}
+    </label>
+    <span class="pure-form-message-inline">
+      {{ _('When enabled, the AI will be used as a last resort to extract price and stock status from product pages where no structured metadata (JSON-LD, microdata, OpenGraph) is found.') }}
+    </span>
+  </div>
+
+  <div class="pure-control-group">
+    <label for="{{ form.llm.form.llm_thinking_budget.id }}">{{ form.llm.form.llm_thinking_budget.label.text }}</label>
+    {{ form.llm.form.llm_thinking_budget() }}
+    <span class="pure-form-message-inline">{{ _('For Gemini 2.5+ models only. Thinking tokens improve reasoning quality but count against the output budget. Set to Off if summaries are being cut short.') }}</span>
+  </div>
+
+  <div class="pure-control-group">
+    <label for="{{ form.llm.form.llm_max_summary_tokens.id }}">{{ form.llm.form.llm_max_summary_tokens.label.text }}</label>
+    {{ form.llm.form.llm_max_summary_tokens() }}
+    <span class="pure-form-message-inline">{{ _('Upper limit on tokens the AI may use when writing a change summary. Higher values allow longer summaries but cost more.') }}</span>
+  </div>
+
+  <div class="pure-control-group">
+    <label>{{ form.llm.form.llm_budget_action.label.text }}</label>
+    <div>
+      {% for subfield in form.llm.form.llm_budget_action %}
+      <label class="pure-radio" style="display:block; font-weight:normal; margin-bottom:0.3em;">
+        {{ subfield() }} {{ subfield.label.text }}
+      </label>
+      {% endfor %}
+    </div>
+  </div>
+  {% else %}
+  <p class="pure-form-message-inline" style="margin-top:0.5em;">
+    {{ _('Configure a provider first to unlock behaviour settings.') }}
+  </p>
+  {% endif %}
+  {% endcall %}
+
+  {# ── Usage ─────────────────────────────────────────────────────────────── #}
+  {% call stab_pane('usage') %}
+  <p class="stab-section-title">{{ _('Token & Cost Tracking') }}</p>
+
+  {% if llm_stored.get('tokens_total_cumulative') or llm_stored.get('tokens_this_month') %}
+
+  <div class="llm-usage-grid">
+    <div class="llm-stat-card">
+      <div class="llm-stat-label">{{ _('This month') }}</div>
+      <div class="llm-stat-value">{{ '{:,}'.format(llm_stored.get('tokens_this_month', 0)) }}</div>
+      <div class="llm-stat-sub">{{ _('tokens') }}{% if llm_show_costs and llm_stored.get('cost_usd_this_month') %} &nbsp;·&nbsp; ≈&thinsp;${{ '%.4f'|format(llm_stored.get('cost_usd_this_month', 0)) }}{% endif %}</div>
+      {% if llm_token_budget_month %}
+      {% set pct = (llm_stored.get('tokens_this_month', 0) / llm_token_budget_month * 100)|int %}
+      <div class="llm-stat-bar-wrap">
+        <div class="llm-stat-bar-fill {% if pct >= 100 %}bar-over{% elif pct >= 80 %}bar-warn{% else %}bar-ok{% endif %}"
+             style="width:{{ [pct, 100]|min }}%"></div>
+      </div>
+      <div class="llm-stat-budget-text">{{ _('%(percent)s%% of %(budget)s', percent=pct, budget='{:,}'.format(llm_token_budget_month)) }}</div>
+      {% endif %}
+    </div>
+
+    <div class="llm-stat-card">
+      <div class="llm-stat-label">{{ _('All-time total') }}</div>
+      <div class="llm-stat-value">{{ '{:,}'.format(llm_stored.get('tokens_total_cumulative', 0)) }}</div>
+      <div class="llm-stat-sub">{{ _('tokens') }}{% if llm_show_costs and llm_stored.get('cost_usd_total_cumulative') %} &nbsp;·&nbsp; ≈&thinsp;${{ '%.4f'|format(llm_stored.get('cost_usd_total_cumulative', 0)) }}{% endif %}</div>
+    </div>
+  </div>
+
+  {% if llm_token_budget_month and llm_stored.get('tokens_this_month', 0) >= llm_token_budget_month %}
+  <p class="llm-budget-alert">&#9888; {{ _('Monthly token budget reached. AI summarisation is paused until next month.') }}</p>
+  {% endif %}
+
+  <div class="llm-usage-settings">
+    <div class="llm-usage-row">
+      <span class="llm-usage-row-label">{{ _('Token budget this period') }}</span>
+      <span class="llm-usage-row-value">
+        {% if llm_token_budget_month_env %}
+          <strong>{{ '{:,}'.format(llm_token_budget_month_env) }}</strong>
+          <span class="llm-env-badge">{{ _('(set via <code>LLM_TOKEN_BUDGET_MONTH</code>)') | safe }}</span>
+          <input type="hidden" name="llm-llm_token_budget_month" value="{{ llm_token_budget_month_env }}">
+        {% else %}
+          {{ form.llm.form.llm_token_budget_month(placeholder=_('0 = unlimited'), value=llm_stored.get('token_budget_month', 0) or '') }}
+          <span class="llm-field-hint">{{ _('tokens (0 = unlimited)') }}</span>
+        {% endif %}
+      </span>
+    </div>
+    {% if llm_stored.get('tokens_month_key') %}
+    <div class="llm-usage-row">
+      <span class="llm-usage-row-label">{{ _('Current billing period') }}</span>
+      <span class="llm-usage-row-value">{{ llm_stored.get('tokens_month_key') }}</span>
+    </div>
+    {% endif %}
+    <div class="llm-usage-row">
+      <span class="llm-usage-row-label">{{ _('Max input characters') }}</span>
+      <span class="llm-usage-row-value">
+        {% if llm_max_input_chars_env %}
+          {{ form.llm.form.llm_max_input_chars(value=llm_max_input_chars_env, readonly=True, style="width:10em;opacity:0.6;cursor:not-allowed;") }}
+          <span class="llm-env-badge">{{ _('(set via <code>LLM_MAX_INPUT_CHARS</code>)') | safe }}</span>
+        {% else %}
+          {{ form.llm.form.llm_max_input_chars(placeholder='100000', value=llm_stored.get('max_input_chars', 100000) or '') }}
+          <span class="llm-field-hint">{{ _('characters — currently enforcing: %(n)s', n='{:,}'.format(llm_effective_max_input_chars)) }}</span>
+        {% endif %}
+      </span>
+    </div>
+  </div>
+
+  {% else %}
+  <p class="llm-no-usage">{{ _('No AI usage recorded yet.') }}</p>
+
+  <div class="llm-usage-settings">
+    <div class="llm-usage-row">
+      <span class="llm-usage-row-label">{{ _('Token budget') }}</span>
+      <span class="llm-usage-row-value">
+        {% if llm_token_budget_month_env %}
+          <strong>{{ '{:,}'.format(llm_token_budget_month_env) }}</strong>
+          <span class="llm-env-badge">{{ _('(set via <code>LLM_TOKEN_BUDGET_MONTH</code>)') | safe }}</span>
+          <input type="hidden" name="llm-llm_token_budget_month" value="{{ llm_token_budget_month_env }}">
+        {% else %}
+          {{ form.llm.form.llm_token_budget_month(placeholder=_('0 = unlimited'), value=llm_stored.get('token_budget_month', 0) or '') }}
+          <span class="llm-field-hint">{{ _('tokens per month (0 = unlimited)') }}</span>
+        {% endif %}
+      </span>
+    </div>
+    <div class="llm-usage-row">
+      <span class="llm-usage-row-label">{{ _('Max input characters') }}</span>
+      <span class="llm-usage-row-value">
+        {% if llm_max_input_chars_env %}
+          {{ form.llm.form.llm_max_input_chars(value=llm_max_input_chars_env, readonly=True, style="width:10em;opacity:0.6;cursor:not-allowed;") }}
+          <span class="llm-env-badge">{{ _('(set via <code>LLM_MAX_INPUT_CHARS</code>)') | safe }}</span>
+        {% else %}
+          {{ form.llm.form.llm_max_input_chars(placeholder='100000', value=llm_stored.get('max_input_chars', 100000) or '') }}
+          <span class="llm-field-hint">{{ _('characters — currently enforcing: %(n)s', n='{:,}'.format(llm_effective_max_input_chars)) }}</span>
+        {% endif %}
+      </span>
+    </div>
+  </div>
+  {% endif %}
+  {% endcall %}
+
+{% endcall %}{# stab_shell #}
+</div>
+
+<script>
+(function () {
+  const LIVE_PROVIDERS = ['openai', 'anthropic', 'gemini', 'ollama'];
+  const BASE_DEFAULTS  = { ollama: 'http://localhost:11434' };
+  const KEY_HINTS = {
+    openai:     '{{ _("platform.openai.com → API keys") }}',
+    anthropic:  '{{ _("console.anthropic.com → API keys") }}',
+    gemini:     '{{ _("aistudio.google.com → Get API key") }}',
+    ollama:     '{{ _("No API key needed for local Ollama") }}',
+    openrouter: '{{ _("openrouter.ai → Keys") }}',
+  };
+
+  window.llmDisclaimerToggle = function (cb) {
+    const fields = document.getElementById('llm-provider-fields');
+    if (fields) fields.style.display = cb.checked ? '' : 'none';
+  };
+
+  window.llmOnProviderChange = function (provider) {
+    const fetchGroup  = document.getElementById('llm-fetch-group');
+    const baseGroup   = document.getElementById('llm-base-group');
+    const modelSelGrp = document.getElementById('llm-model-select-group');
+    const baseField   = document.querySelector('[name="llm-llm_api_base"]');
+    const hint        = document.getElementById('llm-key-hint');
+
+    fetchGroup.style.display = LIVE_PROVIDERS.includes(provider) ? '' : 'none';
+
+    const needsBase = provider === 'ollama' || provider === 'openrouter';
+    baseGroup.style.display = needsBase ? '' : 'none';
+    if (BASE_DEFAULTS[provider] !== undefined) {
+      if (!baseField.value) baseField.value = BASE_DEFAULTS[provider];
+    }
+
+    hint.textContent = KEY_HINTS[provider] || '';
+    modelSelGrp.style.display = 'none';
+    document.getElementById('llm-fetch-status').textContent = '';
+  };
+
+  window.llmFetchModels = async function () {
+    const provider  = document.getElementById('llm-provider').value;
+    const apiKey    = document.querySelector('[name="llm-llm_api_key"]').value.trim();
+    const apiBase   = document.querySelector('[name="llm-llm_api_base"]').value.trim();
+    const btn       = document.getElementById('llm-fetch-btn');
+    const statusEl  = document.getElementById('llm-fetch-status');
+    const selGroup  = document.getElementById('llm-model-select-group');
+    const modelSel  = document.getElementById('llm-model-select');
+
+    if (!provider) { statusEl.textContent = '{{ _("Select a provider first.") }}'; return; }
+
+    btn.disabled = true;
+    btn.textContent = '⏳ {{ _("Loading…") }}';
+    statusEl.textContent = '';
+
+    const params = new URLSearchParams({ provider });
+    if (apiKey)  params.set('api_key',  apiKey);
+    if (apiBase) params.set('api_base', apiBase);
+
+    try {
+      const resp = await fetch('{{ url_for("settings.llm.llm_get_models") }}?' + params);
+      const data = await resp.json();
+
+      if (data.error) {
+        statusEl.style.color = '#c0392b';
+        statusEl.textContent = '✗ ' + data.error;
+        selGroup.style.display = 'none';
+        return;
+      }
+
+      if (!data.models || data.models.length === 0) {
+        statusEl.style.color = '#e67e22';
+        statusEl.textContent = '{{ _("No models returned — check your API key.") }}';
+        selGroup.style.display = 'none';
+        return;
+      }
+
+      modelSel.innerHTML = '<option value="">{{ _("— choose a model —") }}</option>';
+      const currentModel = document.querySelector('[name="llm-llm_model"]').value.trim();
+      for (const m of data.models) {
+        const opt = document.createElement('option');
+        opt.value = m;
+        opt.textContent = m;
+        if (m === currentModel) opt.selected = true;
+        modelSel.appendChild(opt);
+      }
+
+      selGroup.style.display = '';
+      statusEl.style.color = '#27ae60';
+      statusEl.textContent = '✓ ' + data.models.length + ' {{ _("models available with your key") }}';
+    } catch (e) {
+      statusEl.style.color = '#c0392b';
+      statusEl.textContent = '✗ {{ _("Request failed") }}: ' + e.message;
+    } finally {
+      btn.disabled = false;
+      btn.textContent = '↻ {{ _("Load available models") }}';
+    }
+  };
+
+  window.llmOnModelPick = function (value) {
+    if (value) document.querySelector('[name="llm-llm_model"]').value = value;
+  };
+
+  window.llmRunTest = async function () {
+    const btn    = document.getElementById('llm-test-btn');
+    const result = document.getElementById('llm-test-result');
+    if (!btn || !result) return;
+
+    btn.disabled = true;
+    btn.textContent = '⏳ {{ _("Testing…") }}';
+    result.style.display = 'none';
+
+    try {
+      const resp = await fetch('{{ url_for("settings.llm.llm_test") }}');
+      const data = await resp.json();
+      if (data.ok) {
+        result.style.cssText = 'display:block; background:rgba(39,174,96,0.08); border:1px solid rgba(39,174,96,0.3); border-radius:5px; padding:0.6em 0.85em; font-size:0.88em; line-height:1.45;';
+        result.innerHTML = '<span style="color:#27ae60; font-weight:600;">&#10003; {{ _("Connected") }}</span>'
+          + (data.tokens ? ' <span style="opacity:0.55; font-size:0.9em;">(' + data.tokens + ' {{ _("tokens") }})</span>' : '')
+          + '<br><em style="opacity:0.75;">' + data.text.replace(/</g,'&lt;') + '</em>';
+      } else {
+        result.style.cssText = 'display:block; background:rgba(192,57,43,0.07); border:1px solid rgba(192,57,43,0.25); border-radius:5px; padding:0.6em 0.85em; font-size:0.88em; line-height:1.45;';
+        result.innerHTML = '<span style="color:#c0392b; font-weight:600;">&#10007; {{ _("Failed") }}</span><br><code style="font-size:0.92em; word-break:break-all;">' + (data.error || '').replace(/</g,'&lt;') + '</code>';
+      }
+    } catch (e) {
+      result.style.cssText = 'display:block; background:rgba(192,57,43,0.07); border:1px solid rgba(192,57,43,0.25); border-radius:5px; padding:0.6em 0.85em; font-size:0.88em;';
+      result.innerHTML = '<span style="color:#c0392b; font-weight:600;">&#10007; {{ _("Request failed") }}</span>: ' + e.message.replace(/</g,'&lt;');
+    } finally {
+      btn.disabled = false;
+      btn.textContent = '&#9654; {{ _("Test connection") }}';
+    }
+  };
+
+  // On page load: detect and pre-select provider from current model
+  (function detectCurrentProvider() {
+    const modelField = document.querySelector('[name="llm-llm_model"]');
+    if (!modelField) return;
+    const m = modelField.value.trim();
+    if (!m) return;
+
+    let guessed = '';
+    if (m.startsWith('gemini/'))       guessed = 'gemini';
+    else if (m.startsWith('ollama/'))  guessed = 'ollama';
+    else if (m.startsWith('openrouter/')) guessed = 'openrouter';
+    else if (m.startsWith('claude'))   guessed = 'anthropic';
+    else if (m.startsWith('gpt') || m.startsWith('o1') || m.startsWith('o3')) guessed = 'openai';
+
+    if (guessed) {
+      const sel = document.getElementById('llm-provider');
+      if (sel) { sel.value = guessed; llmOnProviderChange(guessed); }
+    }
+  })();
+}());
+</script>

changedetectionio/blueprint/tags/__init__.py

@@ -5,6 +5,7 @@ from loguru import logger
 
 from changedetectionio.store import ChangeDetectionStore
 from changedetectionio.flask_app import login_optionally_required
+from changedetectionio.llm.evaluator import get_llm_config as _get_llm_config
 
 
 def construct_blueprint(datastore: ChangeDetectionStore):
@@ -22,11 +23,14 @@ def construct_blueprint(datastore: ChangeDetectionStore):
 
         tag_count = Counter(tag for watch in datastore.data['watching'].values() if watch.get('tags') for tag in watch['tags'])
 
+        from changedetectionio import processors
         output = render_template("groups-overview.html",
                                  app_rss_token=datastore.data['settings']['application'].get('rss_access_token'),
                                  available_tags=sorted_tags,
                                  form=add_form,
+                                 generate_tag_colors=processors.generate_processor_badge_colors,
                                  tag_count=tag_count,
+                                 wcag_text_color=processors.wcag_text_color,
                                  )
 
         return output
@@ -180,6 +184,7 @@ def construct_blueprint(datastore: ChangeDetectionStore):
             'form': form,
             'watch': default,
             'extra_notification_token_placeholder_info': datastore.get_unique_notification_token_placeholders_available(),
+            'llm_configured': bool(_get_llm_config(datastore)),
         }
 
         included_content = {}
@@ -208,9 +213,17 @@ def construct_blueprint(datastore: ChangeDetectionStore):
             template = env.from_string(template_str)
             included_content = template.render(**template_args)
 
+        # Watches whose URL currently matches this tag's pattern
+        matching_watches = {
+            w_uuid: watch
+            for w_uuid, watch in datastore.data['watching'].items()
+            if default.matches_url(watch.get('url', ''))
+        }
+
         output = render_template("edit-tag.html",
                                  extra_form_content=included_content,
                                  extra_tab_content=form.extra_tab_content() if form.extra_tab_content() else None,
+                                 matching_watches=matching_watches,
                                  settings_application=datastore.data['settings']['application'],
                                  **template_args
                                  )

changedetectionio/blueprint/tags/form.py

@@ -2,20 +2,31 @@ from wtforms import (
     Form,
     StringField,
     SubmitField,
+    TextAreaField,
     validators,
 )
 from wtforms.fields.simple import BooleanField
+from flask_babel import lazy_gettext as _l
 
 from changedetectionio.processors.restock_diff.forms import processor_settings_form as restock_settings_form
+from changedetectionio.llm.ui_strings import LLM_INTENT_TAG_PLACEHOLDER
+from changedetectionio.llm.evaluator import DEFAULT_CHANGE_SUMMARY_PROMPT
 
 class group_restock_settings_form(restock_settings_form):
-    overrides_watch = BooleanField('Activate for individual watches in this tag/group?', default=False)
+    overrides_watch = BooleanField(_l('Activate for individual watches in this tag/group?'), default=False)
+    url_match_pattern = StringField(_l('Auto-apply to watches with URLs matching'),
+                                    render_kw={"placeholder": _l("e.g. *://example.com/* or github.com/myorg")})
+    tag_colour = StringField(_l('Tag colour'), default='')
+    llm_intent = TextAreaField('AI Change Intent',
+                               validators=[validators.Optional(), validators.Length(max=2000)],
+                               render_kw={"rows": "5", "placeholder": LLM_INTENT_TAG_PLACEHOLDER})
+
+    llm_change_summary = TextAreaField('AI Change Summary',
+                               validators=[validators.Optional(), validators.Length(max=2000)],
+                               render_kw={"rows": "5", "placeholder": DEFAULT_CHANGE_SUMMARY_PROMPT},
+                               default='')
 
 class SingleTag(Form):
 
-    name = StringField('Tag name', [validators.InputRequired()], render_kw={"placeholder": "Name"})
-    save_button = SubmitField('Save', render_kw={"class": "pure-button pure-button-primary"})
-
-
-
-
+    name = StringField(_l('Tag name'), [validators.InputRequired()], render_kw={"placeholder": _l("Name")})
+    save_button = SubmitField(_l('Save'), render_kw={"class": "pure-button pure-button-primary"})

changedetectionio/blueprint/tags/templates/edit-tag.html

@@ -17,6 +17,8 @@
 
 </script>
 
+<script src="{{url_for('static_content', group='js', filename='plugins.js')}}" defer></script>
+<script src="{{url_for('static_content', group='js', filename='global-settings.js')}}" defer></script>
 <script src="{{url_for('static_content', group='js', filename='watch-settings.js')}}" defer></script>
 <script src="{{url_for('static_content', group='js', filename='notifications.js')}}" defer></script>
 
@@ -25,6 +27,9 @@
     <div class="tabs collapsable">
         <ul>
             <li class="tab" id=""><a href="#general">{{ _('General') }}</a></li>
+            {% if llm_configured %}
+            <li class="tab"><a href="#ai-llm">{{ _('AI / LLM') }}</a></li>
+            {% endif %}
             <li class="tab"><a href="#filters-and-triggers">{{ _('Filters & Triggers') }}</a></li>
             {% if extra_tab_content %}
             <li class="tab"><a href="#extras_tab">{{ extra_tab_content }}</a></li>
@@ -43,11 +48,58 @@
                     <div class="pure-control-group">
                         {{ render_field(form.title, placeholder="https://...", required=true, class="m-d") }}
                     </div>
+                    <div class="pure-control-group">
+                        {{ render_field(form.url_match_pattern, class="m-d") }}
+                        <span class="pure-form-message-inline">{{ _('Automatically applies this tag to any watch whose URL matches. Supports wildcards: <code>*example.com*</code> or plain substring: <code>github.com/myorg</code>')|safe }}</span>
+                    </div>
+                    {% if matching_watches %}
+                    <div class="pure-control-group">
+                        <label>{{ _('Currently matching watches') }} ({{ matching_watches|length }})</label>
+                        <ul class="tag-url-match-list">
+                            {% for w_uuid, w in matching_watches.items() %}
+                            <li><a href="{{ url_for('ui.ui_edit.edit_page', uuid=w_uuid) }}">{{ w.label }}</a></li>
+                            {% endfor %}
+                        </ul>
+                    </div>
+                    {% endif %}
+                    <div class="pure-control-group">
+                        <label>{{ _('Tag colour') }}</label>
+                        <div style="display:flex; align-items:center; gap:0.75em;">
+                            <input type="checkbox" id="use_custom_colour"
+                                   {% if data.get('tag_colour') %}checked{% endif %}>
+                            <label for="use_custom_colour" style="margin:0">{{ _('Custom colour') }}</label>
+                            <input type="color" id="tag_colour_picker"
+                                   value="{{ data.get('tag_colour') or '#4f8ef7' }}"
+                                   {% if not data.get('tag_colour') %}disabled{% endif %}>
+                            <input type="hidden" name="tag_colour" id="tag_colour_hidden"
+                                   value="{{ data.get('tag_colour', '') }}">
+                        </div>
+                        <span class="pure-form-message-inline">{{ _('Leave unchecked to use the auto-generated colour based on the tag name.') }}</span>
+                    </div>
+                    <script>
+                    (function () {
+                        var cb = document.getElementById('use_custom_colour');
+                        var picker = document.getElementById('tag_colour_picker');
+                        var hidden = document.getElementById('tag_colour_hidden');
+                        picker.addEventListener('input', function () { hidden.value = this.value; });
+                        cb.addEventListener('change', function () {
+                            picker.disabled = !this.checked;
+                            hidden.value = this.checked ? picker.value : '';
+                        });
+                    })();
+                    </script>
                 </fieldset>
             </div>
 
+            {% if llm_configured %}
+            <div class="tab-pane-inner" id="ai-llm">
+                {% include "edit/include_llm_intent.html" %}
+            </div>
+            {% endif %}
+
             <div class="tab-pane-inner" id="filters-and-triggers">
-                <p>{{ _('These settings are') }} <strong><i>{{ _('added') }}</i></strong> {{ _('to any existing watch configurations.') }}</p>
+                <p>{{ _('These settings are <strong><i>added</i></strong> to any existing watch configurations.')|safe }}</p>
+
                 {% include "edit/include_subtract.html" %}
                 <div class="text-filtering border-fieldset">
                     <h3>{{ _('Text filtering') }}</h3>
@@ -78,7 +130,7 @@
                         {% if has_default_notification_urls %}
                         <div class="inline-warning">
                             <img class="inline-warning-icon" src="{{url_for('static_content', group='images', filename='notice.svg')}}" alt="{{ _('Look out!') }}" title="{{ _('Lookout!') }}" >
-                            {{ _('There are') }} <a href="{{ url_for('settings.settings_page')}}#notifications">{{ _('system-wide notification URLs enabled') }}</a>, {{ _('this form will override notification settings for this watch only') }} &dash; {{ _('an empty Notification URL list here will still send notifications.') }}
+                            {{ _('There are <a href="%(url)s">system-wide notification URLs enabled</a>, this form will override notification settings for this watch only &dash; an empty Notification URL list here will still send notifications.', url=url_for('settings.settings_page') ~ '#notifications')|safe }}
                         </div>
                         {% endif %}
                         <a href="#notifications" id="notification-setting-reset-to-default" class="pure-button button-xsmall" style="right: 20px; top: 20px; position: absolute; background-color: #5f42dd; border-radius: 4px; font-size: 70%; color: #fff">{{ _('Use system defaults') }}</a>

changedetectionio/blueprint/tags/templates/groups-overview.html

@@ -3,6 +3,26 @@
 {% from '_helpers.html' import render_simple_field, render_field %}
 <script src="{{url_for('static_content', group='js', filename='jquery-3.6.0.min.js')}}"></script>
 <script src="{{url_for('static_content', group='js', filename='modal.js')}}"></script>
+<style>
+{%- for uuid, tag in available_tags -%}
+{%- if tag and tag.title -%}
+{%- set class_name = tag.title|sanitize_tag_class -%}
+{%- if tag.get('tag_colour') -%}
+.watch-tag-list.tag-{{ class_name }} { background-color: {{ tag.tag_colour }}; color: {{ wcag_text_color(tag.tag_colour) }}; }
+{%- else -%}
+{%- set colors = generate_tag_colors(tag.title) -%}
+.watch-tag-list.tag-{{ class_name }} {
+  background-color: {{ colors['light']['bg'] }};
+  color: {{ colors['light']['color'] }};
+}
+html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
+  background-color: {{ colors['dark']['bg'] }};
+  color: {{ colors['dark']['color'] }};
+}
+{%- endif -%}
+{%- endif -%}
+{%- endfor -%}
+</style>
 
 <div class="box">
     <form class="pure-form" action="{{ url_for('tags.form_tag_add') }}" method="POST" id="new-watch-form">
@@ -45,10 +65,10 @@
             {% for uuid, tag in available_tags  %}
             <tr id="{{ uuid }}" class="{{ loop.cycle('pure-table-odd', 'pure-table-even') }}">
                 <td class="watch-controls">
-                    <a class="link-mute state-{{'on' if tag.notification_muted else 'off'}}" href="{{url_for('tags.mute', uuid=tag.uuid)}}"><img src="{{url_for('static_content', group='images', filename='bell-off.svg')}}" alt="Mute notifications" title="Mute notifications" class="icon icon-mute" ></a>
+                    <a class="link-mute state-{{'on' if tag.notification_muted else 'off'}}" href="{{url_for('tags.mute', uuid=tag.uuid)}}"><img src="{{url_for('static_content', group='images', filename='bell-off.svg')}}" alt="{{ _('Mute notifications') }}" title="{{ _('Mute notifications') }}" class="icon icon-mute" ></a>
                 </td>
                 <td>{{ "{:,}".format(tag_count[uuid]) if uuid in tag_count else 0 }}</td>
-                <td class="title-col inline"> <a href="{{url_for('watchlist.index', tag=uuid) }}">{{ tag.title }}</a></td>
+                <td class="title-col inline"> <a href="{{url_for('watchlist.index', tag=uuid) }}" class="watch-tag-list tag-{{ tag.title|sanitize_tag_class }}">{{ tag.title }}</a></td>
                 <td>
                     <a class="pure-button pure-button-primary" href="{{ url_for('tags.form_tag_edit', uuid=uuid) }}">{{ _('Edit') }}</a>
                     <a href="{{ url_for('ui.form_watch_checknow', tag=uuid) }}" class="pure-button pure-button-primary" >{{ _('Recheck') }}</a>

changedetectionio/blueprint/ui/diff.py

@@ -17,6 +17,34 @@ from changedetectionio.store import ChangeDetectionStore
 from changedetectionio.auth_decorator import login_optionally_required
 
 
+def _clean_litellm_error(exc) -> str:
+    """Return a short, human-readable error string from a litellm exception.
+
+    litellm embeds the raw provider JSON in str(exc), which can be hundreds of
+    characters of verbose quota detail.  We try to pull just the provider's
+    'message' field; failing that we return the first non-empty line with the
+    'litellm.XxxError:' class prefix stripped.
+    """
+    import json, re
+    raw = str(exc)
+    # Try to parse the embedded JSON block (starts at first '{')
+    brace = raw.find('{')
+    if brace >= 0:
+        try:
+            payload = json.loads(raw[brace:])
+            msg = (payload.get('error') or {}).get('message') or ''
+            if msg:
+                # Take only the first sentence / line — provider messages can be long
+                return msg.split('\n')[0].split('. ')[0].strip() + '.'
+        except Exception:
+            pass
+    # Fallback: strip the "litellm.XxxError: litellm.XxxError: providerException - " prefix
+    first_line = raw.split('\n')[0]
+    first_line = re.sub(r'^(litellm\.\w+:\s*)+', '', first_line)
+    first_line = re.sub(r'\w+Exception\s*-\s*', '', first_line).strip()
+    return first_line or raw.split('\n')[0]
+
+
 def construct_blueprint(datastore: ChangeDetectionStore):
     diff_blueprint = Blueprint('ui_diff', __name__, template_folder="../ui/templates")
 
@@ -128,6 +156,168 @@ def construct_blueprint(datastore: ChangeDetectionStore):
             redirect=redirect
         )
 
+    @diff_blueprint.route("/diff/<uuid_str:uuid>/llm-summary/prompt", methods=['GET'])
+    @login_optionally_required
+    def diff_llm_summary_prompt(uuid):
+        """Return the effective LLM summary prompt for a watch immediately (no LLM call)."""
+        from flask import jsonify
+        watch = datastore.data['watching'].get(uuid)
+        if not watch:
+            return jsonify({'prompt': ''}), 404
+        try:
+            from changedetectionio.llm.evaluator import get_effective_summary_prompt
+            prompt = get_effective_summary_prompt(watch, datastore)
+        except Exception:
+            prompt = ''
+        return jsonify({'prompt': prompt})
+
+    @diff_blueprint.route("/diff/<uuid_str:uuid>/llm-summary", methods=['GET'])
+    @login_optionally_required
+    def diff_llm_summary(uuid):
+        """
+        Generate (or return cached) an AI summary of the diff between two snapshots.
+        Called via AJAX from the diff page when no cached summary exists.
+        Returns JSON: {"summary": "...", "error": null} or {"summary": null, "error": "..."}
+        """
+        import difflib
+        from flask import jsonify
+
+        try:
+            watch = datastore.data['watching'][uuid]
+        except KeyError:
+            return jsonify({'summary': None, 'error': 'Watch not found'}), 404
+
+        llm_cfg = datastore.data.get('settings', {}).get('application', {}).get('llm', {})
+        if not llm_cfg.get('model'):
+            return jsonify({'summary': None, 'error': 'LLM not configured'}), 400
+
+        dates = list(watch.history.keys())
+        if len(dates) < 2:
+            return jsonify({'summary': None, 'error': 'Not enough history'}), 400
+
+        best_from = watch.get_from_version_based_on_last_viewed
+        from_version      = request.args.get('from_version', best_from if best_from else dates[-2])
+        to_version        = request.args.get('to_version', dates[-1])
+        all_changes       = request.args.get('all_changes', '0') == '1'
+        ignore_whitespace = request.args.get('ignore_whitespace', '0') == '1'
+        show_removed      = request.args.get('removed', '1') == '1'
+        show_added        = request.args.get('added', '1') == '1'
+
+        def _prep(text):
+            """Optionally normalise whitespace on each line before diffing."""
+            if not ignore_whitespace:
+                return text.splitlines()
+            return [' '.join(line.split()) for line in text.splitlines()]
+
+        def _make_unified_diff(a_text, b_text):
+            lines = list(difflib.unified_diff(_prep(a_text), _prep(b_text), lineterm='', n=3))
+            return '\n'.join(lines[2:]) if len(lines) > 2 else '\n'.join(lines)
+
+        def _apply_filters(diff_text):
+            """Strip +/- lines the user has hidden in the UI so the LLM matches what they see."""
+            if show_removed and show_added:
+                return diff_text
+            out = []
+            for line in diff_text.splitlines():
+                if line.startswith('-') and not show_removed:
+                    continue
+                if line.startswith('+') and not show_added:
+                    continue
+                out.append(line)
+            return '\n'.join(out)
+
+        try:
+            from_text = watch.get_history_snapshot(timestamp=from_version)
+            to_text = watch.get_history_snapshot(timestamp=to_version)
+        except Exception as e:
+            return jsonify({'summary': None, 'error': f'Could not read snapshots: {e}'}), 500
+
+        if all_changes:
+            # Build sequential diffs for every intermediate snapshot between from and to
+            # so the LLM sees the full timeline of changes, not just start→end
+            sorted_dates = sorted(dates)
+            try:
+                start_idx = sorted_dates.index(from_version)
+                end_idx   = sorted_dates.index(to_version)
+            except ValueError:
+                start_idx, end_idx = 0, len(sorted_dates) - 1
+
+            steps = sorted_dates[start_idx:end_idx + 1]
+            segments = []
+            for i in range(len(steps) - 1):
+                a_ts, b_ts = steps[i], steps[i + 1]
+                try:
+                    a_text = watch.get_history_snapshot(timestamp=a_ts) or ''
+                    b_text = watch.get_history_snapshot(timestamp=b_ts) or ''
+                except Exception:
+                    continue
+                seg = _apply_filters(_make_unified_diff(a_text, b_text))
+                if seg.strip():
+                    segments.append(f'=== {a_ts} → {b_ts} ===\n{seg}')
+
+            diff_text = '\n\n'.join(segments) if segments else ''
+        else:
+            diff_text = _apply_filters(_make_unified_diff(from_text, to_text))
+
+        if not diff_text.strip():
+            return jsonify({'summary': None, 'error': 'No differences found'})
+
+        from changedetectionio.llm.evaluator import (
+            summarise_change, get_effective_summary_prompt,
+            is_global_token_budget_exceeded, get_global_token_budget_month,
+            LLMInputTooLargeError,
+        )
+
+        effective_prompt = get_effective_summary_prompt(watch, datastore)
+        from changedetectionio.llm.prompt_builder import build_change_summary_system_prompt
+        # Diff-pref flags + system prompt are part of the cache key so prompt changes bust the cache
+        _max_summary_tokens = datastore.data['settings']['application'].get('llm_max_summary_tokens', 3000)
+        cache_prompt = (
+            effective_prompt
+            + f'\x00prefs:all={int(all_changes)},ws={int(ignore_whitespace)}'
+              f',rm={int(show_removed)},add={int(show_added)}'
+            + f'\x00sys:{build_change_summary_system_prompt()}'
+            + f'\x00max_tokens:{_max_summary_tokens}'
+        )
+
+        # Check cache — keyed by version pair + prompt hash (invalidates if prompt changes)
+        cached = watch.get_llm_diff_summary(from_version, to_version, prompt=cache_prompt)
+        if cached:
+            return jsonify({'summary': cached, 'error': None, 'cached': True})
+
+        # Check global monthly token budget before making an LLM call
+        if is_global_token_budget_exceeded(datastore):
+            budget = get_global_token_budget_month(datastore)
+            llm_cfg = datastore.data.get('settings', {}).get('application', {}).get('llm', {})
+            used = llm_cfg.get('tokens_this_month', 0)
+            return jsonify({
+                'summary': None,
+                'error': gettext(
+                    'Monthly AI token budget of %(budget)s tokens reached (%(used)s used). Resets next month.',
+                    budget=f'{budget:,}',
+                    used=f'{used:,}',
+                ),
+                'budget_exceeded': True,
+            }), 429
+
+        try:
+            summary = summarise_change(watch, datastore, diff=diff_text, current_snapshot=to_text)
+        except LLMInputTooLargeError as e:
+            return jsonify({'summary': None, 'error': str(e)}), 400
+        except Exception as e:
+            logger.error(f"LLM summary generation failed for {uuid}: {e}")
+            return jsonify({'summary': None, 'error': _clean_litellm_error(e)}), 500
+
+        if not summary:
+            return jsonify({'summary': None, 'error': 'LLM returned empty summary'})
+
+        try:
+            watch.save_llm_diff_summary(summary, from_version, to_version, prompt=cache_prompt)
+        except Exception as e:
+            logger.warning(f"Could not cache llm summary for {uuid}: {e}")
+
+        return jsonify({'summary': summary, 'error': None, 'cached': False})
+
     @diff_blueprint.route("/diff/<uuid_str:uuid>/extract", methods=['GET'])
     @login_optionally_required
     def diff_history_page_extract_GET(uuid):
@@ -238,6 +428,47 @@ def construct_blueprint(datastore: ChangeDetectionStore):
             redirect=redirect
         )
 
+    @diff_blueprint.route("/diff/<uuid_str:uuid>/download-patch", methods=['GET'])
+    @login_optionally_required
+    def download_patch(uuid):
+        """
+        Generate and return a unified diff patch file between two snapshots.
+        Query params: from_version, to_version (timestamp strings from watch history).
+        Returns the patch as a downloadable .patch file — the same content fed to the LLM.
+        """
+        import difflib
+
+        try:
+            watch = datastore.data['watching'][uuid]
+        except KeyError:
+            return make_response('Watch not found', 404)
+
+        dates = list(watch.history.keys())
+        if len(dates) < 2:
+            return make_response('Not enough history', 400)
+
+        from_version = request.args.get('from_version', dates[-2])
+        to_version   = request.args.get('to_version',   dates[-1])
+
+        try:
+            from_text = watch.get_history_snapshot(timestamp=from_version)
+            to_text   = watch.get_history_snapshot(timestamp=to_version)
+        except Exception as e:
+            return make_response(f'Could not read snapshots: {e}', 500)
+
+        diff_lines = list(difflib.unified_diff(
+            from_text.splitlines(keepends=True),
+            to_text.splitlines(keepends=True),
+            fromfile=f'snapshot-{from_version}',
+            tofile=f'snapshot-{to_version}',
+            lineterm='',
+        ))
+        patch_text = ''.join(diff_lines) if diff_lines else '(no differences)\n'
+
+        response = make_response(patch_text)
+        response.headers['Content-Type'] = 'text/plain; charset=utf-8'
+        return response
+
     @diff_blueprint.route("/diff/<uuid_str:uuid>/processor-asset/<string:asset_name>", methods=['GET'])
     @login_optionally_required
     def processor_asset(uuid, asset_name):

changedetectionio/blueprint/ui/edit.py

@@ -10,10 +10,32 @@ from changedetectionio.store import ChangeDetectionStore
 from changedetectionio.auth_decorator import login_optionally_required
 from changedetectionio.time_handler import is_within_schedule
 from changedetectionio import worker_pool
+from changedetectionio.llm.evaluator import get_llm_config as _get_llm_config
 
 def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMetaData):
     edit_blueprint = Blueprint('ui_edit', __name__, template_folder="../ui/templates")
-    
+
+    def _resolve_llm_group_overrides(watch, datastore) -> dict:
+        """
+        For each LLM field (llm_intent, llm_change_summary): if the watch has no own
+        value but a linked tag does, return {'value': ..., 'group_name': ...} so the
+        edit template can render the textarea as readonly with a group-sourced placeholder.
+        Returns None for each field when the watch has its own value (editable).
+        """
+        result = {'llm_intent': None, 'llm_change_summary': None}
+        for field in ('llm_intent', 'llm_change_summary'):
+            if (watch.get(field) or '').strip():
+                continue  # watch has its own value — editable, no group override
+            for tag_uuid in watch.get('tags', []):
+                tag = datastore.data['settings']['application'].get('tags', {}).get(tag_uuid)
+                if tag and (tag.get(field) or '').strip():
+                    result[field] = {
+                        'value': tag.get(field).strip(),
+                        'group_name': tag.get('title', 'tag'),
+                    }
+                    break
+        return result
+
     def _watch_has_tag_options_set(watch):
         """This should be fixed better so that Tag is some proper Model, a tag is just a Watch also"""
         for tag_uuid, tag in datastore.data['settings']['application'].get('tags', {}).items():
@@ -142,7 +164,7 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
         for p in datastore.extra_browsers:
             form.fetch_backend.choices.append(p)
 
-        form.fetch_backend.choices.append(("system", 'System settings default'))
+        form.fetch_backend.choices.append(("system", gettext('System settings default')))
 
         # form.browser_steps[0] can be assumed that we 'goto url' first
 
@@ -150,7 +172,7 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
             # @todo - Couldn't get setattr() etc dynamic addition working, so remove it instead
             del form.proxy
         else:
-            form.proxy.choices = [('', 'Default')]
+            form.proxy.choices = [('', gettext('Default'))]
             for p in datastore.proxy_list:
                 form.proxy.choices.append(tuple((p, datastore.proxy_list[p]['label'])))
 
@@ -301,7 +323,7 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
                 'extra_classes': ' '.join(c),
                 'extra_notification_token_placeholder_info': datastore.get_unique_notification_token_placeholders_available(),
                 'extra_processor_config': form.extra_tab_content(),
-                'extra_title': f" - Edit - {watch.label}",
+                'extra_title': f" - {gettext('Edit')} - {watch.label}",
                 'form': form,
                 'has_default_notification_urls': True if len(datastore.data['settings']['application']['notification_urls']) else False,
                 'has_extra_headers_file': len(datastore.get_all_headers_in_textfile_for_watch(uuid=uuid)) > 0,
@@ -320,7 +342,15 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
                 'using_global_webdriver_wait': not default['webdriver_delay'],
                 'uuid': uuid,
                 'watch': watch,
-                'capabilities': capabilities
+                'capabilities': capabilities,
+                'auto_applied_tags': {
+                    tag_uuid: tag
+                    for tag_uuid, tag in datastore.data['settings']['application']['tags'].items()
+                    if tag_uuid not in watch.get('tags', []) and tag.matches_url(watch.get('url', ''))
+                },
+                # LLM intent context
+                'llm_configured': bool(_get_llm_config(datastore)),
+                'llm_group_overrides': _resolve_llm_group_overrides(watch, datastore),
             }
 
             included_content = None

changedetectionio/blueprint/ui/preview.py

@@ -107,7 +107,7 @@ def construct_blueprint(datastore: ChangeDetectionStore):
                                  current_diff_url=watch['url'],
                                  current_version=timestamp,
                                  extra_stylesheets=extra_stylesheets,
-                                 extra_title=f" - Diff - {watch.label} @ {timestamp}",
+                                 extra_title=f" - {gettext('Diff')} - {watch.label} @ {timestamp}",
                                  highlight_ignored_line_numbers=ignored_line_numbers,
                                  highlight_triggered_line_numbers=triggered_line_numbers,
                                  highlight_blocked_line_numbers=blocked_line_numbers,

changedetectionio/blueprint/ui/templates/diff.html

@@ -25,7 +25,8 @@
         <fieldset class="diff-fieldset">
             {% if versions|length >= 1 %}
                 <span style="white-space: nowrap;">
-                <label id="change-from" for="diff-from-version" class="from-to-label">{{ _('From') }}</label>
+                {# TRANSLATORS: 'From' labels the older snapshot version selector on the diff page #}
+                <label id="change-from" for="diff-from-version" class="from-to-label">{{ pgettext('diff version', 'From') }}</label>
                 <select id="diff-from-version" name="from_version" class="needs-localtime">
                     {%- for version in versions|reverse -%}
                         <option value="{{ version }}" {% if version== from_version %} selected="" {% endif %}>
@@ -35,7 +36,8 @@
                 </select>
                 </span>
                 <span style="white-space: nowrap;">
-                <label id="change-to" for="diff-to-version" class="from-to-label">{{ _('To') }}</label>
+                {# TRANSLATORS: 'To' labels the newer snapshot version selector on the diff page #}
+                <label id="change-to" for="diff-to-version" class="from-to-label">{{ pgettext('diff version', 'To') }}</label>
                 <select id="diff-to-version" name="to_version" class="needs-localtime">
                     {%- for version in versions|reverse -%}
                         <option value="{{ version }}" {% if version== to_version %} selected="" {% endif %}>
@@ -76,6 +78,12 @@
                 <label for="replaced" class="pure-checkbox" id="label-diff-replaced">
                 <input type="checkbox" id="replaced"  name="replaced" {% if diff_prefs.replaced %}checked=""{% endif %}> {{ _('Replaced') }}</label>
             </span>
+            {%- if llm_configured -%}
+            <span>
+                <label for="llm_all_changes" class="pure-checkbox" id="label-diff-llm-all-changes" title="{{ _('Include all intermediate snapshots between the selected versions in the AI summary') }}">
+                <input type="checkbox" id="llm_all_changes" name="llm_all_changes" {% if diff_prefs.llm_all_changes %}checked=""{% endif %}> &#x2728; {{ _('AI: every change between versions') }}</label>
+            </span>
+            {%- endif -%}
         </fieldset>
         {%- if versions|length >= 2 -%}
             <div id="keyboard-nav">
@@ -124,9 +132,22 @@
         </div>
     {%- endif -%}
         {%- if password_enabled_and_share_is_off -%}
-            <div class="tip">{{ _('Pro-tip: You can enable') }} <strong>{{ _('"share access when password is enabled"') }}</strong> {{ _('from settings.') }}
+            <div class="tip">{{ _('Pro-tip: You can enable <strong>"share access when password is enabled"</strong> from settings.')|safe }}
             </div>
         {%- endif -%}
+        {%- if llm_configured -%}
+        <div id="llm-diff-summary-area"{% if not llm_diff_summary %} data-pending="1"{% endif %}>
+            <span class="llm-diff-summary-label">&#x2728; {{ _('AI Change Summary') }}</span>
+            {%- if llm_diff_summary -%}
+            <p class="llm-diff-summary-text">{{ llm_diff_summary }}</p>
+            {%- else -%}
+            <p class="llm-diff-summary-text llm-diff-summary-loading">{{ _('Generating summary…') }}</p>
+            {%- if llm_summary_prompt -%}
+            <p class="llm-diff-summary-prompt"><span class="llm-diff-summary-prompt-text">{{ llm_summary_prompt }}</span></p>
+            {%- endif -%}
+            {%- endif -%}
+        </div>
+        {%- endif -%}
         <div id="text-diff-heading-area"  style="user-select: none;">
             <div class="snapshot-age"><span>{{ from_version|format_timestamp_timeago }}</span>
                 {%- if note -%}<span class="note"><strong>{{ note }}</strong></span>{%- endif -%}
@@ -136,6 +157,7 @@
         <pre id="difference" style="border-left: 2px solid #ddd;">{{ content| diff_unescape_difference_spans }}</pre>
     <div id="diff-visualiser-area-after" style="user-select: none;">
         <strong>{{ _('Tip:') }}</strong> {{ _('Highlight text to share or add to ignore lists.') }}
+        &nbsp;&mdash;&nbsp;<a href="{{ url_for('ui.ui_diff.download_patch', uuid=uuid, from_version=from_version, to_version=to_version) }}" target="_blank" rel="noopener" style="font-size:0.85em;">{{ _('Download difference patch') }}</a>
     </div>
     </div>
 
@@ -162,5 +184,58 @@
 </script>
 <script src="{{url_for('static_content', group='js', filename='diff-render.js')}}"></script>
 
+{% if llm_configured %}
+<script>
+$(function () {
+    var $area = $('#llm-diff-summary-area');
+    if (!$area.length || !$area.data('pending')) return;
+
+    var fromVersion = $('#diff-from-version').val();
+    var toVersion   = $('#diff-to-version').val();
+    var summaryUrl  = "{{ url_for('ui.ui_diff.diff_llm_summary', uuid=uuid) }}";
+
+    function showLlmError(msg) {
+        $area.find('.llm-diff-summary-text')
+             .removeClass('llm-diff-summary-loading')
+             .addClass('llm-error')
+             .text(msg);
+        $area.removeAttr('data-pending');
+    }
+
+    var llmAllChanges      = $('#llm_all_changes').is(':checked')    ? 1 : 0;
+    var ignoreWhitespace   = $('#ignoreWhitespace').is(':checked')   ? 1 : 0;
+    var showRemoved        = $('#removed').is(':checked')            ? 1 : 0;
+    var showAdded          = $('#added').is(':checked')              ? 1 : 0;
+    $.getJSON(summaryUrl, {
+        from_version:      fromVersion,
+        to_version:        toVersion,
+        all_changes:       llmAllChanges,
+        ignore_whitespace: ignoreWhitespace,
+        removed:           showRemoved,
+        added:             showAdded,
+    })
+        .done(function (data) {
+            if (data.summary) {
+                $area.find('.llm-diff-summary-text')
+                     .removeClass('llm-diff-summary-loading')
+                     .text(data.summary);
+                $area.removeAttr('data-pending');
+            } else if (data.error) {
+                showLlmError(data.error);
+            } else {
+                $area.remove();
+            }
+        })
+        .fail(function (xhr) {
+            var resp = xhr.responseJSON;
+            if (resp && resp.error) {
+                showLlmError(resp.error);
+            } else {
+                showLlmError('AI summary request failed (HTTP ' + xhr.status + ').');
+            }
+        });
+});
+</script>
+{% endif %}
 
 {% endblock %}

changedetectionio/blueprint/ui/templates/edit.html

@@ -1,6 +1,6 @@
 {% extends 'base.html' %}
 {% block content %}
-{% from '_helpers.html' import render_field, render_checkbox_field, render_button, render_time_schedule_form, playwright_warning, only_playwright_type_watches_warning, highlight_trigger_ignored_explainer, render_conditions_fieldlist_of_formfields_as_table, render_ternary_field %}
+{% from '_helpers.html' import render_field, render_checkbox_field, render_button, render_time_schedule_form, only_playwright_type_watches_warning, highlight_trigger_ignored_explainer, render_conditions_fieldlist_of_formfields_as_table, render_ternary_field %}
 {% from '_common_fields.html' import render_common_settings_form %}
 <script src="{{url_for('static_content', group='js', filename='tabs.js')}}" defer></script>
 <script src="{{url_for('static_content', group='js', filename='vis.js')}}" defer></script>
@@ -57,6 +57,7 @@
             {% if capabilities.supports_visual_selector %}
             <li class="tab"><a id="visualselector-tab" href="#visualselector">{{ _('Visual Filter Selector') }}</a></li>
             {% endif %}
+            <li class="tab"><a href="#ai-llm">{{ _('AI / LLM') }}</a></li>
             {% if capabilities.supports_text_filters_and_triggers %}
             <li class="tab" id="filters-and-triggers-tab"><a href="#filters-and-triggers">{{ _('Filters & Triggers') }}</a></li>
             <li class="tab" id="conditions-tab"><a href="#conditions">{{ _('Conditions') }}</a></li>
@@ -81,6 +82,14 @@
                     <div class="pure-control-group">
                         {{ render_field(form.tags) }}
                         <span class="pure-form-message-inline">{{ _('Organisational tag/group name used in the main listing page') }}</span>
+                        {% if auto_applied_tags %}
+                        <span class="pure-form-message-inline">
+                            {{ _('Also automatically applied by URL pattern:') }}
+                            {% for tag_uuid, tag in auto_applied_tags.items() %}
+                            <a href="{{ url_for('tags.form_tag_edit', uuid=tag_uuid) }}" class="watch-tag-list tag-{{ tag.title|sanitize_tag_class }}">{{ tag.title }}</a>
+                            {% endfor %}
+                        </span>
+                        {% endif %}
                     </div>
                     <div class="pure-control-group inline-radio">
                         {{ render_field(form.processor) }}
@@ -133,8 +142,8 @@
                     <div class="pure-control-group inline-radio">
                         {{ render_field(form.fetch_backend, class="fetch-backend") }}
                         <span class="pure-form-message-inline">
-                            <p>{{ _('Use the') }} <strong>{{ _('Basic') }}</strong> {{ _('method (default) where your watched site doesn\'t need Javascript to render.') }}</p>
-                            <p>{{ _('The') }} <strong>{{ _('Chrome/Javascript') }}</strong> {{ _('method requires a network connection to a running WebDriver+Chrome server, set by the ENV var \'WEBDRIVER_URL\'.') }} </p>
+                            <p>{{ _('Use the <strong>Basic</strong> method (default) where your watched sites don\'t need Javascript to render.')|safe }}</p>
+                            <p>{{ _('The <strong>Chrome/Javascript</strong> method requires a network connection to a running WebDriver+Chrome server, set by the ENV var \'WEBDRIVER_URL\'.')|safe }}</p>
                             {{ _('Tip:') }} <a href="https://github.com/dgtlmoon/changedetection.io/wiki/Proxy-configuration#brightdata-proxy-support">{{ _('Connect using Bright Data and Oxylabs Proxies, find out more here.') }}</a>
                         </span>
                     </div>
@@ -155,7 +164,7 @@
                         <div class="pure-form-message-inline">
                             <strong>{{ _('If you\'re having trouble waiting for the page to be fully rendered (text missing etc), try increasing the \'wait\' time here.') }}</strong>
                             <br>
-                            {{ _('This will wait') }} <i>n</i> {{ _('seconds before extracting the text.') }}
+                            {{ _('This will wait <i>n</i> seconds before extracting the text.')|safe }}
                             {% if using_global_webdriver_wait %}
                             <br><strong>{{ _('Using the current global default settings') }}</strong>
                             {% endif %}
@@ -288,7 +297,7 @@ Math: {{ 1 + 1 }}") }}
                         {% if has_default_notification_urls %}
                         <div class="inline-warning">
                             <img class="inline-warning-icon" src="{{url_for('static_content', group='images', filename='notice.svg')}}" alt="{{ _('Look out!') }}" title="{{ _('Lookout!') }}" >
-                            {{ _('There are') }} <a href="{{ url_for('settings.settings_page')}}#notifications">{{ _('system-wide notification URLs enabled') }}</a>, {{ _('this form will override notification settings for this watch only') }} &dash; {{ _('an empty Notification URL list here will still send notifications.') }}
+                            {{ _('There are <a href="%(url)s">system-wide notification URLs enabled</a>, this form will override notification settings for this watch only &dash; an empty Notification URL list here will still send notifications.', url=url_for('settings.settings_page') ~ '#notifications')|safe }}
                         </div>
                         {% endif %}
                         <a href="#notifications" id="notification-setting-reset-to-default" class="pure-button button-xsmall" style="right: 20px; top: 20px; position: absolute; background-color: #5f42dd; border-radius: 4px; font-size: 70%; color: #fff">{{ _('Use system defaults') }}</a>
@@ -312,7 +321,11 @@ Math: {{ 1 + 1 }}") }}
                     </div>
                 </div>
             </div>
+            <div class="tab-pane-inner" id="ai-llm">
+                {% include "edit/include_llm_intent.html" %}
+            </div>
             <div class="tab-pane-inner" id="filters-and-triggers">
+
                 <span id="activate-text-preview" class="pure-button pure-button-primary button-xsmall">{{ _('Activate preview') }}</span>
               <div>
               <div id="edit-text-filter">
@@ -338,7 +351,7 @@ Math: {{ 1 + 1 }}") }}
                         {{ render_checkbox_field(form.filter_text_added) }}
                         {{ render_checkbox_field(form.filter_text_replaced) }}
                         {{ render_checkbox_field(form.filter_text_removed) }}
-                    <span class="pure-form-message-inline">{{ _('Note: Depending on the length and similarity of the text on each line, the algorithm may consider an') }} <strong>{{ _('addition') }}</strong> {{ _('instead of') }} <strong>{{ _('replacement') }}</strong> {{ _('for example.') }}</span><br>
+                    <span class="pure-form-message-inline">{{ _('Note: Depending on the length and similarity of the text on each line, the algorithm may consider an <strong>addition</strong> instead of <strong>replacement</strong> for example.')|safe }}</span><br>
                     <span class="pure-form-message-inline">&nbsp;{{ _('So it\'s always better to select') }} <strong>{{ _('Added') }}</strong>+<strong>{{ _('Replaced') }}</strong> {{ _('when you\'re interested in new content.') }}</span><br>
                     <span class="pure-form-message-inline">&nbsp;{{ _('When content is merely moved in a list, it will also trigger an') }} <strong>{{ _('addition') }}</strong>, {{ _('consider enabling') }} <code><strong>{{ _('Only trigger when unique lines appear') }}</strong></code></span>
                 </fieldset>
@@ -352,7 +365,7 @@ Math: {{ 1 + 1 }}") }}
                 </fieldset>
                 <fieldset class="pure-control-group">
                     {{ render_checkbox_field(form.sort_text_alphabetically) }}
-                    <span class="pure-form-message-inline">{{ _('Helps reduce changes detected caused by sites shuffling lines around, combine with') }} <i>{{ _('check unique lines') }}</i> {{ _('below.') }}</span>
+                    <span class="pure-form-message-inline">{{ _('Helps reduce changes detected caused by sites shuffling lines around, combine with <i>check unique lines</i> below.')|safe }}</span>
                 </fieldset>
                 <fieldset class="pure-control-group">
                     {{ render_checkbox_field(form.trim_text_whitespace) }}
@@ -366,7 +379,20 @@ Math: {{ 1 + 1 }}") }}
                     const preview_text_edit_filters_url="{{url_for('ui.ui_edit.watch_get_preview_rendered', uuid=uuid)}}";
                 </script>
                 <br>
-                {#<div id="text-preview-controls"><span id="text-preview-refresh" class="pure-button button-xsmall">Refresh</span></div>#}
+                {% if llm_configured %}
+                <div id="llm-preview-result" style="display:none; margin-bottom: 0.8em; padding: 0.8em 1.1em; border-radius: 4px; border-left: 4px solid #ccc; font-size: 0.9em;">
+                    <div style="font-size:0.75em; text-transform:uppercase; letter-spacing:0.06em; opacity:0.55; margin-bottom:0.35em;">{{ _('AI Intent preview') }}</div>
+                    <span class="llm-preview-verdict" style="font-weight: bold;"></span>
+                    <div class="llm-preview-answer" style="margin-top: 0.5em; white-space: pre-wrap; line-height: 1.5; font-style: italic;"></div>
+                </div>
+                <style>
+                    #llm-preview-result { transition: border-color 0.2s, background 0.2s; }
+                    #llm-preview-result[data-found="1"] { border-color: #2ecc71; background: rgba(46,204,113,0.07); }
+                    #llm-preview-result[data-found="1"] .llm-preview-verdict { color: #27ae60; }
+                    #llm-preview-result[data-found="0"] { border-color: #aaa; background: rgba(0,0,0,0.03); }
+                    #llm-preview-result[data-found="0"] .llm-preview-verdict { color: #888; }
+                </style>
+                {% endif %}
                 <div class="minitabs-wrapper">
                   <div class="minitabs-content">
                       <div id="text-preview-inner" class="monospace-preview">
@@ -476,6 +502,16 @@ Math: {{ 1 + 1 }}") }}
                             <td>{{ _('Server type reply') }}</td>
                             <td>{{ watch.get('remote_server_reply') }}</td>
                         </tr>
+                        {% if settings_application.get('llm', {}).get('model') %}
+                        <tr>
+                            <td>{{ _('AI tokens (last check)') }}</td>
+                            <td>{{ "{:,}".format(watch.get('llm_last_tokens_used') or 0) }}</td>
+                        </tr>
+                        <tr>
+                            <td>{{ _('AI tokens (total)') }}</td>
+                            <td>{{ "{:,}".format(watch.get('llm_tokens_used_cumulative') or 0) }}</td>
+                        </tr>
+                        {% endif %}
                         </tbody>
                     </table>
 

changedetectionio/blueprint/ui/views.py

@@ -26,7 +26,11 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
         add_paused = request.form.get('edit_and_watch_submit_button') != None
         from changedetectionio import processors
         processor = request.form.get('processor', processors.get_default_processor())
-        new_uuid = datastore.add_watch(url=url, tag=request.form.get('tags','').strip(), extras={'paused': add_paused, 'processor': processor})
+        llm_intent = request.form.get('llm_intent', '').strip()
+        extras = {'paused': add_paused, 'processor': processor}
+        if llm_intent:
+            extras['llm_intent'] = llm_intent
+        new_uuid = datastore.add_watch(url=url, tag=request.form.get('tags','').strip(), extras=extras)
 
         if new_uuid:
             if add_paused:

changedetectionio/blueprint/watchlist/__init__.py

@@ -82,6 +82,11 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
         sorted_tags = sorted(datastore.data['settings']['application'].get('tags').items(), key=lambda x: x[1]['title'])
 
         proxy_list = datastore.proxy_list
+
+        from changedetectionio.llm.evaluator import get_llm_config as _get_llm_config
+        from changedetectionio.llm.ui_strings import LLM_INTENT_WATCH_PLACEHOLDER
+        llm_configured = bool(_get_llm_config(datastore))
+
         output = render_template(
             "watch-overview.html",
             active_tag=active_tag,
@@ -89,9 +94,10 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
             app_rss_token=datastore.data['settings']['application'].get('rss_access_token'),
             datastore=datastore,
             errored_count=errored_count,
-            extra_classes='has-queue' if not update_q.empty() else '',
+            extra_classes=' '.join(filter(None, ['has-queue' if not update_q.empty() else '', 'llm-configured' if llm_configured else ''])),
             form=form,
             generate_tag_colors=processors.generate_processor_badge_colors,
+            wcag_text_color=processors.wcag_text_color,
             guid=datastore.data['app_guid'],
             has_proxies=proxy_list,
             hosted_sticky=os.getenv("SALTED_PASS", False) == False,
@@ -108,7 +114,9 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
             system_default_fetcher=datastore.data['settings']['application'].get('fetch_backend'),
             tags=sorted_tags,
             unread_changes_count=datastore.unread_changes_count,
-            watches=sorted_watches
+            watches=sorted_watches,
+            llm_configured=llm_configured,
+            llm_intent_watch_placeholder=LLM_INTENT_WATCH_PLACEHOLDER,
         )
 
         # Return freed template-building memory to the OS immediately.

changedetectionio/blueprint/watchlist/templates/watch-overview.html

@@ -71,6 +71,13 @@ document.addEventListener('DOMContentLoaded', function() {
 {%- for uuid, tag in tags -%}
 {%- if tag and tag.title -%}
 {%- set class_name = tag.title|sanitize_tag_class -%}
+{%- if tag.get('tag_colour') -%}
+.button-tag.tag-{{ class_name }},
+.watch-tag-list.tag-{{ class_name }} {
+  background-color: {{ tag.tag_colour }};
+  color: {{ wcag_text_color(tag.tag_colour) }};
+}
+{%- else -%}
 {%- set colors = generate_tag_colors(tag.title) -%}
 .button-tag.tag-{{ class_name }} {
   background-color: {{ colors['light']['bg'] }};
@@ -92,6 +99,7 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
   color: {{ colors['dark']['color'] }};
 }
 {%- endif -%}
+{%- endif -%}
 {%- endfor -%}
 </style>
 <div class="box" id="form-quick-watch-add">
@@ -105,6 +113,16 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
                     {{ render_nolabel_field(form.watch_submit_button, title=_("Watch this URL!") ) }}
                     {{ render_nolabel_field(form.edit_and_watch_submit_button, title=_("Edit first then Watch") ) }}
             </div>
+            {% if llm_configured %}
+            <div id="quick-watch-llm-intent" style="display:none; margin-top: 0.5em;">
+                <textarea name="llm_intent"
+                          id="quick_watch_llm_intent"
+                          rows="2"
+                          class="pure-input-1"
+                          placeholder="{{ _('AI — Notify when…') }} {{ llm_intent_watch_placeholder }}"
+                ></textarea>
+            </div>
+            {% endif %}
             <div id="watch-group-tag">
                {{ render_field(form.tags, value=active_tag.title if active_tag_uuid else '', placeholder=_("Watch group / tag"), class="transparent-field") }}
             </div>
@@ -118,6 +136,14 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
         </span>
     </form>
 </div>
+{% if llm_configured %}
+<script>
+window.watchOverviewI18n = {
+    generatingSummary: {{ _('Generating summary…')|tojson }},
+    gotoHistory:       {{ _('Goto full history')|tojson }}
+};
+</script>
+{% endif %}
 <div class="box">
     <form class="pure-form" action="{{ url_for('ui.form_watch_list_checkbox_operations') }}" method="POST" id="watch-list-form">
     <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" >
@@ -237,10 +263,10 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
                 <td class="inline checkbox-uuid" ><div><input name="uuids"  type="checkbox" value="{{ watch.uuid}} " > <span class="counter-i">{{ loop.index+pagination.skip }}</span></div></td>
                 <td class="inline watch-controls">
                     <div>
-                    <a class="ajax-op state-off pause-toggle" data-op="pause" href="{{url_for('watchlist.index', op='pause', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='pause.svg')}}" alt="Pause checks" title="Pause checks" class="icon icon-pause" ></a>
-                    <a class="ajax-op state-on pause-toggle"  data-op="pause" style="display: none" href="{{url_for('watchlist.index', op='pause', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='play.svg')}}" alt="UnPause checks" title="UnPause checks" class="icon icon-unpause" ></a>
-                    <a class="ajax-op state-off mute-toggle" data-op="mute" href="{{url_for('watchlist.index', op='mute', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='bell-off.svg')}}" alt="Mute notification" title="Mute notification" class="icon icon-mute" ></a>
-                    <a class="ajax-op state-on mute-toggle" data-op="mute"  style="display: none" href="{{url_for('watchlist.index', op='mute', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='bell-off.svg')}}" alt="UnMute notification" title="UnMute notification" class="icon icon-mute" ></a>
+                    <a class="ajax-op state-off pause-toggle" data-op="pause" href="{{url_for('watchlist.index', op='pause', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='pause.svg')}}" alt="{{ _('Pause checks') }}" title="{{ _('Pause checks') }}" class="icon icon-pause" ></a>
+                    <a class="ajax-op state-on pause-toggle"  data-op="pause" style="display: none" href="{{url_for('watchlist.index', op='pause', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='play.svg')}}" alt="{{ _('UnPause checks') }}" title="{{ _('UnPause checks') }}" class="icon icon-unpause" ></a>
+                    <a class="ajax-op state-off mute-toggle" data-op="mute" href="{{url_for('watchlist.index', op='mute', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='bell-off.svg')}}" alt="{{ _('Mute notification') }}" title="{{ _('Mute notification') }}" class="icon icon-mute" ></a>
+                    <a class="ajax-op state-on mute-toggle" data-op="mute"  style="display: none" href="{{url_for('watchlist.index', op='mute', uuid=watch.uuid, tag=active_tag_uuid)}}"><img src="{{url_for('static_content', group='images', filename='bell-off.svg')}}" alt="{{ _('UnMute notification') }}" title="{{ _('UnMute notification') }}" class="icon icon-mute" ></a>
                     </div>
                 </td>
 
@@ -284,7 +310,7 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
                             {%- endfor -%}
                         </div>
                     <div class="status-icons">
-                            <a class="link-spread" href="{{url_for('ui.form_share_put_watch', uuid=watch.uuid)}}"><img src="{{url_for('static_content', group='images', filename='spread.svg')}}" class="status-icon icon icon-spread" title="Create a link to share watch config with others" ></a>
+                            <a class="link-spread" href="{{url_for('ui.form_share_put_watch', uuid=watch.uuid)}}"><img src="{{url_for('static_content', group='images', filename='spread.svg')}}" class="status-icon icon icon-spread" title="{{ _('Create a link to share watch config with others') }}" ></a>
                             {%- set effective_fetcher = watch.get_fetch_backend if watch.get_fetch_backend != "system" else system_default_fetcher -%}
                             {%- if effective_fetcher and ("html_webdriver" in effective_fetcher or "html_" in effective_fetcher or "extra_browser_" in effective_fetcher) -%}
                                 {{ effective_fetcher|fetcher_status_icons }}
@@ -327,13 +353,13 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
                 </td>
 {%- endif -%}
             {#last_checked becomes fetch-start-time#}
-                <td class="last-checked" data-timestamp="{{ watch.last_checked }}" data-fetchduration={{ watch.fetch_time }} data-eta_complete="{{ watch.last_checked+watch.fetch_time }}" >
+                <td class="last-checked" data-timestamp="{{ watch.last_checked }}" data-fetchduration={{ watch.fetch_time }} data-eta_complete="{{ watch.last_checked+watch.fetch_time }}" data-label="{{ _('Last Checked') }}">
                     <div class="spinner-wrapper" style="display:none;" >
                         <span class="spinner"></span><span class="status-text">&nbsp;{{ _('Checking now') }}</span>
                     </div>
                     <span class="innertext">{{watch|format_last_checked_time|safe}}</span>
                 </td>
-                <td class="last-changed" data-timestamp="{{ watch.last_changed }}">{%- if watch.history_n >=2 and watch.last_changed >0 -%}
+                <td class="last-changed" data-timestamp="{{ watch.last_changed }}" data-label="{{ _('Last Changed') }}">{%- if watch.history_n >=2 and watch.last_changed >0 -%}
                     {{watch.last_changed|format_timestamp_timeago}}
                     {%- else -%}
                     {{ _('Not yet') }}
@@ -345,7 +371,7 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
                     <a href="" class="already-in-queue-button recheck pure-button pure-button-primary" style="display: none;" disabled="disabled">{{ _('Queued') }}</a>
                     <a href="{{ url_for('ui.form_watch_checknow', uuid=watch.uuid, tag=request.args.get('tag')) }}" data-op='recheck' class="ajax-op recheck pure-button pure-button-primary">{{ _('Recheck') }}</a>
                     <a href="{{ url_for('ui.ui_edit.edit_page', uuid=watch.uuid, tag=active_tag_uuid)}}#general" class="pure-button pure-button-primary">{{ _('Edit') }}</a>
-                    <a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=watch.uuid)}}" {{target_attr}} class="pure-button pure-button-primary history-link" style="display: none;">{{ _('History') }}</a>
+                    <a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=watch.uuid)}}" {{target_attr}} class="pure-button pure-button-primary history-link ai-history-btn" style="display: none;" data-uuid="{{ watch.uuid }}" data-summary-url="{{ url_for('ui.ui_diff.diff_llm_summary', uuid=watch.uuid) }}"><span class="btn-label-history">{{ _('History') }}</span><span class="btn-label-summary">&#x2728; {{ _('Summary') }}</span></a>
                     <a href="{{ url_for('ui.ui_preview.preview_page', uuid=watch.uuid)}}" {{target_attr}} class="pure-button pure-button-primary preview-link" style="display: none;">{{ _('Preview') }}</a>
                     </div>
                 </td>

changedetectionio/conditions/__init__.py

@@ -1,4 +1,5 @@
 from json_logic.builtins import BUILTINS
+from flask_babel import lazy_gettext as _l
 
 from .exceptions import EmptyConditionRuleRowNotUsable
 from .pluggy_interface import plugin_manager  # Import the pluggy plugin manager
@@ -6,19 +7,19 @@ from . import default_plugin
 from loguru import logger
 # List of all supported JSON Logic operators
 operator_choices = [
-    (None, "Choose one - Operator"),
-    (">", "Greater Than"),
-    ("<", "Less Than"),
-    (">=", "Greater Than or Equal To"),
-    ("<=", "Less Than or Equal To"),
-    ("==", "Equals"),
-    ("!=", "Not Equals"),
-    ("in", "Contains"),
+    (None, _l("Choose one - Operator")),
+    (">", _l("Greater Than")),
+    ("<", _l("Less Than")),
+    (">=", _l("Greater Than or Equal To")),
+    ("<=", _l("Less Than or Equal To")),
+    ("==", _l("Equals")),
+    ("!=", _l("Not Equals")),
+    ("in", _l("Contains")),
 ]
 
 # Fields available in the rules
 field_choices = [
-    (None, "Choose one - Field"),
+    (None, _l("Choose one - Field")),
 ]
 
 # The data we will feed the JSON Rules to see if it passes the test/conditions or not

changedetectionio/conditions/default_plugin.py

@@ -3,6 +3,7 @@ import re
 import pluggy
 from price_parser import Price
 from loguru import logger
+from flask_babel import lazy_gettext as _l
 
 hookimpl = pluggy.HookimplMarker("changedetectionio_conditions")
 
@@ -47,22 +48,22 @@ def register_operators():
 @hookimpl
 def register_operator_choices():
     return [
-        ("!in", "Does NOT Contain"),
-        ("starts_with", "Text Starts With"),
-        ("ends_with", "Text Ends With"),
-        ("length_min", "Length minimum"),
-        ("length_max", "Length maximum"),
-        ("contains_regex", "Text Matches Regex"),
-        ("!contains_regex", "Text Does NOT Match Regex"),
+        ("!in", _l("Does NOT Contain")),
+        ("starts_with", _l("Text Starts With")),
+        ("ends_with", _l("Text Ends With")),
+        ("length_min", _l("Length minimum")),
+        ("length_max", _l("Length maximum")),
+        ("contains_regex", _l("Text Matches Regex")),
+        ("!contains_regex", _l("Text Does NOT Match Regex")),
     ]
 
 @hookimpl
 def register_field_choices():
     return [
-        ("extracted_number", "Extracted number after 'Filters & Triggers'"),
+        ("extracted_number", _l("Extracted number after 'Filters & Triggers'")),
 #        ("meta_description", "Meta Description"),
 #        ("meta_keywords", "Meta Keywords"),
-        ("page_filtered_text", "Page text after 'Filters & Triggers'"),
+        ("page_filtered_text", _l("Page text after 'Filters & Triggers'")),
         #("page_title", "Page <title>"), # actual page title <title>
     ]
 

changedetectionio/conditions/form.py

@@ -1,6 +1,7 @@
 # Condition Rule Form (for each rule row)
 from wtforms import Form, SelectField, StringField, validators
 from wtforms import validators
+from flask_babel import lazy_gettext as _l
 
 class ConditionFormRow(Form):
 
@@ -8,18 +9,18 @@ class ConditionFormRow(Form):
     from changedetectionio.conditions import plugin_manager
     from changedetectionio.conditions import operator_choices, field_choices
     field = SelectField(
-        "Field",
+        _l("Field"),
         choices=field_choices,
         validators=[validators.Optional()]
     )
 
     operator = SelectField(
-        "Operator",
+        _l("Operator"),
         choices=operator_choices,
         validators=[validators.Optional()]
     )
 
-    value = StringField("Value", validators=[validators.Optional()], render_kw={"placeholder": "A value"})
+    value = StringField(_l("Value"), validators=[validators.Optional()], render_kw={"placeholder": _l("A value")})
 
     def validate(self, extra_validators=None):
         # First, run the default validators
@@ -30,15 +31,15 @@ class ConditionFormRow(Form):
         # If any of the operator/field/value is set, then they must be all set
         if any(value not in ("", False, "None", None) for value in [self.operator.data, self.field.data, self.value.data]):
             if not self.operator.data or self.operator.data == 'None':
-                self.operator.errors.append("Operator is required.")
+                self.operator.errors.append(_l("Operator is required."))
                 return False
 
             if not self.field.data or self.field.data == 'None':
-                self.field.errors.append("Field is required.")
+                self.field.errors.append(_l("Field is required."))
                 return False
 
             if not self.value.data:
-                self.value.errors.append("Value is required.")
+                self.value.errors.append(_l("Value is required."))
                 return False
 
         return True  # Only return True if all conditions pass

changedetectionio/conditions/plugins/levenshtein_plugin.py

@@ -4,6 +4,7 @@ Provides metrics for measuring text similarity between snapshots.
 """
 import pluggy
 from loguru import logger
+from flask_babel import gettext as _, lazy_gettext as _l
 
 LEVENSHTEIN_MAX_LEN_FOR_EDIT_STATS=100000
 
@@ -53,8 +54,8 @@ def register_operator_choices():
 @conditions_hookimpl
 def register_field_choices():
     return [
-        ("levenshtein_ratio", "Levenshtein - Text similarity ratio"),
-        ("levenshtein_distance", "Levenshtein - Text change distance"),
+        ("levenshtein_ratio", _l("Levenshtein - Text similarity ratio")),
+        ("levenshtein_distance", _l("Levenshtein - Text change distance")),
     ]
 
 @conditions_hookimpl
@@ -77,7 +78,7 @@ def ui_edit_stats_extras(watch):
     """Add Levenshtein stats to the UI using the global plugin system"""
     """Generate the HTML for Levenshtein stats - shared by both plugin systems"""
     if len(watch.history.keys()) < 2:
-        return "<p>Not enough history to calculate Levenshtein metrics</p>"
+        return f"<p>{_('Not enough history to calculate Levenshtein metrics')}</p>"
 
 
     # Protection against the algorithm getting stuck on huge documents
@@ -87,37 +88,37 @@ def ui_edit_stats_extras(watch):
             for idx in (-1, -2)
             if len(k) >= abs(idx)
     ):
-        return "<p>Snapshot too large for edit statistics, skipping.</p>"
+        return f"<p>{_('Snapshot too large for edit statistics, skipping.')}</p>"
 
     try:
         lev_data = levenshtein_ratio_recent_history(watch)
         if not lev_data or not isinstance(lev_data, dict):
-            return "<p>Unable to calculate Levenshtein metrics</p>"
-            
+            return f"<p>{_('Unable to calculate Levenshtein metrics')}</p>"
+
         html = f"""
         <div class="levenshtein-stats">
-            <h4>Levenshtein Text Similarity Details</h4>
+            <h4>{_('Levenshtein Text Similarity Details')}</h4>
             <table class="pure-table">
                 <tbody>
                     <tr>
-                        <td>Raw distance (edits needed)</td>
+                        <td>{_('Raw distance (edits needed)')}</td>
                         <td>{lev_data['distance']}</td>
                     </tr>
                     <tr>
-                        <td>Similarity ratio</td>
+                        <td>{_('Similarity ratio')}</td>
                         <td>{lev_data['ratio']:.4f}</td>
                     </tr>
                     <tr>
-                        <td>Percent similar</td>
+                        <td>{_('Percent similar')}</td>
                         <td>{lev_data['percent_similar']}%</td>
                     </tr>
                 </tbody>
             </table>
-            <p style="font-size: 80%;">Levenshtein metrics compare the last two snapshots, measuring how many character edits are needed to transform one into the other.</p>
+            <p style="font-size: 80%;">{_('Levenshtein metrics compare the last two snapshots, measuring how many character edits are needed to transform one into the other.')}</p>
         </div>
         """
         return html
     except Exception as e:
         logger.error(f"Error generating Levenshtein UI extras: {str(e)}")
-        return "<p>Error calculating Levenshtein metrics</p>"
+        return f"<p>{_('Error calculating Levenshtein metrics')}</p>"
         

changedetectionio/conditions/plugins/wordcount_plugin.py

@@ -4,6 +4,7 @@ Provides word count metrics for snapshot content.
 """
 import pluggy
 from loguru import logger
+from flask_babel import gettext as _, lazy_gettext as _l
 
 # Support both plugin systems
 conditions_hookimpl = pluggy.HookimplMarker("changedetectionio_conditions")
@@ -40,7 +41,7 @@ def register_operator_choices():
 def register_field_choices():
     # Add a field that will be available in conditions
     return [
-        ("word_count", "Word count of content"),
+        ("word_count", _l("Word count of content")),
     ]
 
 @conditions_hookimpl
@@ -61,16 +62,16 @@ def _generate_stats_html(watch):
     
     html = f"""
     <div class="word-count-stats">
-        <h4>Content Analysis</h4>
+        <h4>{_('Content Analysis')}</h4>
         <table class="pure-table">
             <tbody>
                 <tr>
-                    <td>Word count (latest snapshot)</td>
+                    <td>{_('Word count (latest snapshot)')}</td>
                     <td>{word_count}</td>
                 </tr>
             </tbody>
         </table>
-        <p style="font-size: 80%;">Word count is a simple measure of content length, calculated by splitting text on whitespace.</p>
+        <p style="font-size: 80%;">{_('Word count is a simple measure of content length, calculated by splitting text on whitespace.')}</p>
     </div>
     """
     return html

changedetectionio/content_fetchers/playwright.py

@@ -49,6 +49,9 @@ async def capture_full_page_async(page, screenshot_format='JPEG', watch_uuid=Non
     if page_height > page.viewport_size['height']:
         if page_height < step_size:
             step_size = page_height # Incase page is bigger than default viewport but smaller than proposed step size
+        # Never set viewport taller than our max capture height - otherwise one screenshot chunk
+        # captures the whole (e.g. 8098px) page even when SCREENSHOT_MAX_HEIGHT=1000
+        step_size = min(step_size, SCREENSHOT_MAX_TOTAL_HEIGHT)
         viewport_start = time.time()
         logger.debug(f"{watch_info}Setting bigger viewport to step through large page width W{page.viewport_size['width']}xH{step_size} because page_height > viewport_size")
         # Set viewport to a larger size to capture more content at once

changedetectionio/content_fetchers/puppeteer.py

@@ -75,6 +75,9 @@ async def capture_full_page(page, screenshot_format='JPEG', watch_uuid=None, loc
     if page_height > page.viewport['height']:
         if page_height < step_size:
             step_size = page_height # Incase page is bigger than default viewport but smaller than proposed step size
+        # Never set viewport taller than our max capture height - otherwise one screenshot chunk
+        # captures the whole page even when SCREENSHOT_MAX_HEIGHT is set smaller
+        step_size = min(step_size, SCREENSHOT_MAX_TOTAL_HEIGHT)
         viewport_start = time.time()
         await page.setViewport({'width': page.viewport['width'], 'height': step_size})
         viewport_time = time.time() - viewport_start

changedetectionio/content_fetchers/requests.py

@@ -1,3 +1,4 @@
+from flask_babel import lazy_gettext as _l
 from loguru import logger
 from urllib.parse import urljoin, urlparse
 import hashlib
@@ -13,7 +14,7 @@ from changedetectionio.validate_url import is_private_hostname
 
 # "html_requests" is listed as the default fetcher in store.py!
 class fetcher(Fetcher):
-    fetcher_description = "Basic fast Plaintext/HTTP Client"
+    fetcher_description = _l("Basic fast Plaintext/HTTP Client")
 
     def __init__(self, proxy_override=None, custom_browser_connection_url=None, **kwargs):
         super().__init__(**kwargs)

changedetectionio/content_fetchers/res/favicon-fetcher.js

@@ -38,26 +38,39 @@
       if (a.size !== b.size) {
         return b.size - a.size;
       }
-      
+
       // Second priority: apple-touch-icon over regular icon
       const isAppleA = /apple-touch-icon/.test(a.rel);
       const isAppleB = /apple-touch-icon/.test(b.rel);
       if (isAppleA && !isAppleB) return -1;
       if (!isAppleA && isAppleB) return 1;
-      
+
       // Third priority: icons with no size attribute (fallback icons) last
       const hasNoSizeA = !a.hasSizes;
       const hasNoSizeB = !b.hasSizes;
       if (hasNoSizeA && !hasNoSizeB) return 1;
       if (!hasNoSizeA && hasNoSizeB) return -1;
-      
+
       return 0;
     });
 
     const timeoutMs = 2000;
+    // 1 MB — matches the server-side limit in bump_favicon()
+    const MAX_BYTES = 1 * 1024 * 1024;
 
     for (const icon of icons) {
       try {
+        // Inline data URI — no network fetch needed, data is already here
+        if (icon.href.startsWith('data:')) {
+          const match = icon.href.match(/^data:([^;]+);base64,([A-Za-z0-9+/=]+)$/);
+          if (!match) continue;
+          const mime_type = match[1];
+          const base64 = match[2];
+          // Rough size check: base64 is ~4/3 the binary size
+          if (base64.length * 0.75 > MAX_BYTES) continue;
+          return { url: icon.href, mime_type, base64 };
+        }
+
         const controller = new AbortController();
         const timeout = setTimeout(() => controller.abort(), timeoutMs);
 
@@ -74,12 +87,15 @@
 
         const blob = await resp.blob();
 
+        if (blob.size > MAX_BYTES) continue;
+
         // Convert blob to base64
         const reader = new FileReader();
         return await new Promise(resolve => {
           reader.onloadend = () => {
             resolve({
               url: icon.href,
+              mime_type: blob.type,
               base64: reader.result.split(",")[1]
             });
           };
@@ -98,4 +114,3 @@
   // Auto-execute and return result for page.evaluate()
   return await window.getFaviconAsBlob();
 })();
-

changedetectionio/content_fetchers/screenshot_handler.py

@@ -56,6 +56,10 @@ def stitch_images_worker_raw_bytes(pipe_conn, original_page_height, capture_heig
             im.close()
         del images
 
+        # Clip stitched image to capture_height (chunks may overshoot by up to step_size-1 px)
+        if total_height > capture_height:
+            stitched = stitched.crop((0, 0, max_width, capture_height))
+
         # Draw caption only if page was trimmed
         if original_page_height > capture_height:
             draw = ImageDraw.Draw(stitched)

changedetectionio/content_fetchers/webdriver_selenium.py

@@ -104,15 +104,17 @@ class fetcher(Fetcher):
 
             from selenium.webdriver.remote.remote_connection import RemoteConnection
             from selenium.webdriver.remote.webdriver import WebDriver as RemoteWebDriver
+            from selenium.webdriver.remote.client_config import ClientConfig
+            from urllib3.util import Timeout
             driver = None
             try:
-                # Create the RemoteConnection and set timeout (e.g., 30 seconds)
-                remote_connection = RemoteConnection(
-                    self.browser_connection_url,
+                connection_timeout = int(os.getenv("WEBDRIVER_CONNECTION_TIMEOUT", 90))
+                client_config = ClientConfig(
+                    remote_server_addr=self.browser_connection_url,
+                    timeout=Timeout(connect=connection_timeout, total=connection_timeout)
                 )
-                remote_connection.set_timeout(30)  # seconds
+                remote_connection = RemoteConnection(client_config=client_config)
 
-                # Now create the driver with the RemoteConnection
                 driver = RemoteWebDriver(
                     command_executor=remote_connection,
                     options=options

changedetectionio/diff/__init__.py

@@ -45,8 +45,38 @@ CHANGED_INTO_PLACEMARKER_CLOSED = '@changed_into_PLACEMARKER_CLOSED'
 # Compiled regex patterns for performance
 WHITESPACE_NORMALIZE_RE = re.compile(r'\s+')
 
+# Regexes built from the constants above — no brittle hardcoded strings
+_EXTRACT_REMOVED_RE = re.compile(
+    re.escape(REMOVED_PLACEMARKER_OPEN) + r'(.*?)' + re.escape(REMOVED_PLACEMARKER_CLOSED)
+    + r'|' +
+    re.escape(CHANGED_PLACEMARKER_OPEN) + r'(.*?)' + re.escape(CHANGED_PLACEMARKER_CLOSED)
+)
+_EXTRACT_ADDED_RE = re.compile(
+    re.escape(ADDED_PLACEMARKER_OPEN) + r'(.*?)' + re.escape(ADDED_PLACEMARKER_CLOSED)
+    + r'|' +
+    re.escape(CHANGED_INTO_PLACEMARKER_OPEN) + r'(.*?)' + re.escape(CHANGED_INTO_PLACEMARKER_CLOSED)
+)
 
-def render_inline_word_diff(before_line: str, after_line: str, ignore_junk: bool = False, markdown_style: str = None, tokenizer: str = 'words_and_html') -> tuple[str, bool]:
+
+def extract_changed_from(raw_diff: str) -> str:
+    """Extract only the removed/changed-from fragments from a raw diff string.
+
+    Useful for {{diff_changed_from}} — gives just the old value (e.g. old price),
+    not the full surrounding line. Multiple fragments joined with newlines.
+    """
+    return '\n'.join(next((g for g in m.groups() if g is not None), '') for m in _EXTRACT_REMOVED_RE.finditer(raw_diff))
+
+
+def extract_changed_to(raw_diff: str) -> str:
+    """Extract only the added/changed-into fragments from a raw diff string.
+
+    Useful for {{diff_changed_to}} — gives just the new value (e.g. new price),
+    not the full surrounding line. Multiple fragments joined with newlines.
+    """
+    return '\n'.join(next((g for g in m.groups() if g is not None), '') for m in _EXTRACT_ADDED_RE.finditer(raw_diff))
+
+
+def render_inline_word_diff(before_line: str, after_line: str, ignore_junk: bool = False, markdown_style: str = None, tokenizer: str = 'words_and_html', include_change_type_prefix: bool = True) -> tuple[str, bool]:
     """
     Render word-level differences between two lines inline using diff-match-patch library.
 
@@ -133,14 +163,20 @@ def render_inline_word_diff(before_line: str, after_line: str, ignore_junk: bool
         if removed_tokens:
             removed_full = ''.join(removed_tokens).rstrip()
             trailing_removed = ''.join(removed_tokens)[len(removed_full):] if len(''.join(removed_tokens)) > len(removed_full) else ''
-            result_parts.append(f'{CHANGED_PLACEMARKER_OPEN}{removed_full}{CHANGED_PLACEMARKER_CLOSED}{trailing_removed}')
+            if include_change_type_prefix:
+                result_parts.append(f'{CHANGED_PLACEMARKER_OPEN}{removed_full}{CHANGED_PLACEMARKER_CLOSED}{trailing_removed}')
+            else:
+                result_parts.append(f'{removed_full}{trailing_removed}')
 
         if added_tokens:
             if result_parts:  # Add newline between removed and added
                 result_parts.append('\n')
             added_full = ''.join(added_tokens).rstrip()
             trailing_added = ''.join(added_tokens)[len(added_full):] if len(''.join(added_tokens)) > len(added_full) else ''
-            result_parts.append(f'{CHANGED_INTO_PLACEMARKER_OPEN}{added_full}{CHANGED_INTO_PLACEMARKER_CLOSED}{trailing_added}')
+            if include_change_type_prefix:
+                result_parts.append(f'{CHANGED_INTO_PLACEMARKER_OPEN}{added_full}{CHANGED_INTO_PLACEMARKER_CLOSED}{trailing_added}')
+            else:
+                result_parts.append(f'{added_full}{trailing_added}')
 
         return ''.join(result_parts), has_changes
     else:
@@ -150,21 +186,27 @@ def render_inline_word_diff(before_line: str, after_line: str, ignore_junk: bool
             if op == 0:  # Equal
                 result_parts.append(text)
             elif op == 1:  # Insertion
-                # Don't wrap empty content (e.g., whitespace-only tokens after rstrip)
-                content = text.rstrip()
-                trailing = text[len(content):] if len(text) > len(content) else ''
-                if content:
-                    result_parts.append(f'{ADDED_PLACEMARKER_OPEN}{content}{ADDED_PLACEMARKER_CLOSED}{trailing}')
+                if not include_change_type_prefix:
+                    result_parts.append(text)
                 else:
-                    result_parts.append(trailing)
+                    # Don't wrap empty content (e.g., whitespace-only tokens after rstrip)
+                    content = text.rstrip()
+                    trailing = text[len(content):] if len(text) > len(content) else ''
+                    if content:
+                        result_parts.append(f'{ADDED_PLACEMARKER_OPEN}{content}{ADDED_PLACEMARKER_CLOSED}{trailing}')
+                    else:
+                        result_parts.append(trailing)
             elif op == -1:  # Deletion
-                # Don't wrap empty content (e.g., whitespace-only tokens after rstrip)
-                content = text.rstrip()
-                trailing = text[len(content):] if len(text) > len(content) else ''
-                if content:
-                    result_parts.append(f'{REMOVED_PLACEMARKER_OPEN}{content}{REMOVED_PLACEMARKER_CLOSED}{trailing}')
+                if not include_change_type_prefix:
+                    result_parts.append(text)
                 else:
-                    result_parts.append(trailing)
+                    # Don't wrap empty content (e.g., whitespace-only tokens after rstrip)
+                    content = text.rstrip()
+                    trailing = text[len(content):] if len(text) > len(content) else ''
+                    if content:
+                        result_parts.append(f'{REMOVED_PLACEMARKER_OPEN}{content}{REMOVED_PLACEMARKER_CLOSED}{trailing}')
+                    else:
+                        result_parts.append(trailing)
 
         return ''.join(result_parts), has_changes
 
@@ -360,7 +402,7 @@ def customSequenceMatcher(
 
             # Use inline word-level diff for single line replacements when word_diff is enabled
             if word_diff and len(before_lines) == 1 and len(after_lines) == 1:
-                inline_diff, has_changes = render_inline_word_diff(before_lines[0], after_lines[0], ignore_junk=ignore_junk, tokenizer=tokenizer)
+                inline_diff, has_changes = render_inline_word_diff(before_lines[0], after_lines[0], ignore_junk=ignore_junk, tokenizer=tokenizer, include_change_type_prefix=include_change_type_prefix)
                 # Check if there are any actual changes (not just whitespace when ignore_junk is enabled)
                 if ignore_junk and not has_changes:
                     # No real changes, skip this line
@@ -415,8 +457,8 @@ def render_diff(
     Returns:
         str: Rendered difference
     """
-    newest_lines = [line.rstrip() for line in newest_version_file_contents.splitlines()]
-    previous_lines = [line.rstrip() for line in previous_version_file_contents.splitlines()] if previous_version_file_contents else []
+    newest_lines = [line.rstrip() for line in (newest_version_file_contents or '').splitlines()]
+    previous_lines = [line.rstrip() for line in (previous_version_file_contents or '').splitlines()]
     now = time.time()
     logger.debug(
         f"diff options: "

changedetectionio/flask_app.py

@@ -212,6 +212,11 @@ def _is_safe_valid_url(test_url):
     from .validate_url import is_safe_valid_url
     return is_safe_valid_url(test_url)
 
+@app.template_global('get_html_head_extras')
+def _get_html_head_extras():
+    from .pluggy_interface import collect_html_head_extras
+    return collect_html_head_extras()
+
 
 @app.template_filter('format_number_locale')
 def _jinja2_filter_format_number_locale(value: float) -> str:
@@ -976,6 +981,11 @@ def changedetection_app(config=None, datastore_o=None):
                     "queued_data": all_queued
                 })
 
+    if strtobool(os.getenv('HISTORY_SNAPSHOT_FILE_ALLOW_OUTSIDE_WATCH_DATADIR', 'False')):
+        logger.warning("SECURITY WARNING: HISTORY_SNAPSHOT_FILE_ALLOW_OUTSIDE_WATCH_DATADIR is enabled — "
+                       "snapshot reads are NOT confined to the watch data directory. "
+                       "This disables protection against path traversal via restored backups (GHSA-8757-69j2-hx56).")
+
     # Start the async workers during app initialization
     # Can be overridden by ENV or use the default settings
     n_workers = int(os.getenv("FETCH_WORKERS", datastore.data['settings']['requests']['workers']))

changedetectionio/forms.py

@@ -5,6 +5,8 @@ from wtforms.widgets.core import TimeInput
 from flask_babel import lazy_gettext as _l, gettext
 
 from changedetectionio.blueprint.rss import RSS_FORMAT_TYPES, RSS_TEMPLATE_TYPE_OPTIONS, RSS_TEMPLATE_HTML_DEFAULT
+from changedetectionio.llm.ui_strings import LLM_INTENT_WATCH_PLACEHOLDER
+from changedetectionio.llm.evaluator import DEFAULT_CHANGE_SUMMARY_PROMPT, LLM_DEFAULT_MAX_SUMMARY_TOKENS, LLM_DEFAULT_THINKING_BUDGET
 from changedetectionio.conditions.form import ConditionFormRow
 from changedetectionio.notification_service import NotificationContextData
 from changedetectionio.strtobool import strtobool
@@ -16,6 +18,7 @@ from wtforms import (
     Field,
     FloatField,
     IntegerField,
+    PasswordField,
     RadioField,
     SelectField,
     StringField,
@@ -725,7 +728,7 @@ class ValidateStartsWithRegex(object):
                 raise ValidationError(self.message or _l("Invalid value."))
 
 class quickWatchForm(Form):
-    url = fields.URLField(_l('URL'), validators=[validateURL()])
+    url = StringField(_l('URL'), validators=[validateURL()])
     tags = StringTagUUID(_l('Group tag'), validators=[validators.Optional()])
     watch_submit_button = SubmitField(_l('Watch'), render_kw={"class": "pure-button pure-button-primary"})
     processor = RadioField(_l('Processor'), choices=lambda: processors.available_processors(), default=processors.get_default_processor)
@@ -771,16 +774,16 @@ class SingleBrowserStep(Form):
     operation = SelectField(_l('Operation'), [validators.Optional()], choices=browser_step_ui_config.keys())
 
     # maybe better to set some <script>var..
-    selector = StringField(_l('Selector'), [validators.Optional()], render_kw={"placeholder": "CSS or xPath selector"})
-    optional_value = StringField(_l('value'), [validators.Optional()], render_kw={"placeholder": "Value"})
+    selector = StringField(_l('Selector'), [validators.Optional()], render_kw={"placeholder": _l("CSS or xPath selector")})
+    optional_value = StringField(_l('value'), [validators.Optional()], render_kw={"placeholder": _l("Value")})
 #   @todo move to JS? ajax fetch new field?
 #    remove_button = SubmitField(_l('-'), render_kw={"type": "button", "class": "pure-button pure-button-primary", 'title': 'Remove'})
 #    add_button = SubmitField(_l('+'), render_kw={"type": "button", "class": "pure-button pure-button-primary", 'title': 'Add new step after'})
 
 class processor_text_json_diff_form(commonSettingsForm):
 
-    url = fields.URLField('Web Page URL', validators=[validateURL()])
-    tags = StringTagUUID('Group Tag', [validators.Optional()], default='')
+    url = StringField(_l('Web Page URL'), validators=[validateURL()])
+    tags = StringTagUUID(_l('Group Tag'), [validators.Optional()], default='')
 
     time_between_check = EnhancedFormField(
         TimeBetweenCheckForm,
@@ -794,10 +797,18 @@ class processor_text_json_diff_form(commonSettingsForm):
 
     time_between_check_use_default = BooleanField(_l('Use global settings for time between check and scheduler.'), default=False)
 
+    llm_intent = TextAreaField(_l('AI Change Intent'), validators=[validators.Optional(), validators.Length(max=2000)],
+                               render_kw={"rows": "5", "placeholder": LLM_INTENT_WATCH_PLACEHOLDER})
+
+    llm_change_summary = TextAreaField(_l('AI Change Summary'), validators=[validators.Optional(), validators.Length(max=2000)],
+                               render_kw={"rows": "5", "placeholder": DEFAULT_CHANGE_SUMMARY_PROMPT},
+                               default='')
+
     include_filters = StringListField(_l('CSS/JSONPath/JQ/XPath Filters'), [ValidateCSSJSONXPATHInput()], default='')
 
     subtractive_selectors = StringListField(_l('Remove elements'), [ValidateCSSJSONXPATHInput(allow_json=False)])
 
+    extract_lines_containing = StringListField(_l('Extract lines containing'), [validators.Optional()])
     extract_text = StringListField(_l('Extract text'), [ValidateListRegex()])
 
     title = StringField(_l('Title'), default='')
@@ -917,7 +928,7 @@ class processor_text_json_diff_form(commonSettingsForm):
 
 class SingleExtraProxy(Form):
     # maybe better to set some <script>var..
-    proxy_name = StringField(_l('Name'), [validators.Optional()], render_kw={"placeholder": "Name"})
+    proxy_name = StringField(_l('Name'), [validators.Optional()], render_kw={"placeholder": _l("Name")})
     proxy_url = StringField(_l('Proxy URL'), [
         validators.Optional(),
         ValidateStartsWithRegex(
@@ -929,7 +940,7 @@ class SingleExtraProxy(Form):
     ], render_kw={"placeholder": "socks5:// or regular proxy http://user:pass@...:3128", "size":50})
 
 class SingleExtraBrowser(Form):
-    browser_name = StringField(_l('Name'), [validators.Optional()], render_kw={"placeholder": "Name"})
+    browser_name = StringField(_l('Name'), [validators.Optional()], render_kw={"placeholder": _l("Name")})
     browser_connection_url = StringField(_l('Browser connection URL'), [
         validators.Optional(),
         ValidateStartsWithRegex(
@@ -988,7 +999,7 @@ class globalSettingsApplicationForm(commonSettingsForm):
     api_access_token_enabled = BooleanField(_l('API access token security check enabled'), default=True, validators=[validators.Optional()])
     base_url = StringField(_l('Notification base URL override'),
                            validators=[validators.Optional()],
-                           render_kw={"placeholder": os.getenv('BASE_URL', 'Not set')}
+                           render_kw={"placeholder": os.getenv('BASE_URL', _l('Not set'))}
                            )
     empty_pages_are_a_change =  BooleanField(_l('Treat empty pages as a change?'), default=False)
     fetch_backend = RadioField(_l('Fetch Method'), default="html_requests", choices=content_fetchers.available_fetchers(), validators=[ValidateContentFetcherIsReady()])
@@ -998,7 +1009,7 @@ class globalSettingsApplicationForm(commonSettingsForm):
 
     # Screenshot comparison settings
     min_change_percentage = FloatField(
-        'Screenshot: Minimum Change Percentage',
+        _l('Screenshot: Minimum Change Percentage'),
         validators=[
             validators.Optional(),
             validators.NumberRange(min=0.0, max=100.0, message=_l('Must be between 0 and 100'))
@@ -1038,6 +1049,126 @@ class globalSettingsApplicationForm(commonSettingsForm):
     ui = FormField(globalSettingsApplicationUIForm)
 
 
+class globalSettingsLLMForm(Form):
+    """
+    LLM / AI provider settings — stored under datastore['settings']['application']['llm'].
+
+    Uses litellm under the hood, so the model string encodes both the provider and model.
+    No separate provider dropdown needed — litellm routes automatically:
+      gpt-4o-mini                           → OpenAI
+      claude-3-5-haiku-20251001             → Anthropic
+      ollama/llama3.2                       → Ollama (local)
+      openrouter/google/gemma-3-12b-it:free → OpenRouter (free tier)
+      gemini/gemini-2.0-flash               → Google Gemini
+      azure/gpt-4o                          → Azure OpenAI
+    """
+    llm_model = StringField(
+        _l('Model'),
+        validators=[validators.Optional()],
+        render_kw={"placeholder": "gpt-4o-mini", "style": "width: 24em;"},
+    )
+    llm_api_key = PasswordField(
+        _l('API Key'),
+        validators=[validators.Optional()],
+        render_kw={
+            "placeholder": _l('Leave blank to use LITELLM_API_KEY env var'),
+            "autocomplete": "off",
+            "style": "width: 24em;",
+        },
+    )
+    llm_api_base = StringField(
+        _l('API Base URL'),
+        validators=[validators.Optional()],
+        render_kw={
+            "placeholder": "http://localhost:11434  (Ollama / custom endpoints only)",
+            "style": "width: 24em;",
+        },
+    )
+    llm_change_summary_default = TextAreaField(
+        _l('Default AI Change Summary prompt'),
+        validators=[validators.Optional(), validators.Length(max=2000)],
+        render_kw={
+            "rows": "5",
+            "placeholder": DEFAULT_CHANGE_SUMMARY_PROMPT,
+            "style": "width: 100%; ",
+        },
+        default='',
+    )
+    llm_max_tokens_per_check = IntegerField(
+        _l('Max tokens per check'),
+        validators=[validators.Optional(), validators.NumberRange(min=0)],
+        default=0,
+        render_kw={
+            "placeholder": "0 = unlimited",
+            "style": "width: 8em;",
+        },
+    )
+    llm_max_tokens_cumulative = IntegerField(
+        _l('Max cumulative tokens (per watch)'),
+        validators=[validators.Optional(), validators.NumberRange(min=0)],
+        default=0,
+        render_kw={
+            "placeholder": "0 = unlimited",
+            "style": "width: 8em;",
+        },
+    )
+    llm_token_budget_month = IntegerField(
+        _l('Monthly token budget'),
+        validators=[validators.Optional(), validators.NumberRange(min=0)],
+        default=0,
+        render_kw={"style": "width: 10em;"},
+    )
+    llm_max_input_chars = IntegerField(
+        _l('Max input characters'),
+        validators=[validators.Optional(), validators.NumberRange(min=1)],
+        default=100000,
+        render_kw={
+            "placeholder": "100000",
+            "style": "width: 10em;",
+        },
+    )
+    llm_override_diff_with_summary = BooleanField(
+        _l('Replace {{diff}} notification token with AI summary'),
+        default=True,
+    )
+    llm_restock_use_fallback_extract = BooleanField(
+        _l('Use LLM as a fallback for extracting price and restock info'),
+        default=True,
+    )
+    llm_thinking_budget = SelectField(
+        _l('AI thinking budget (tokens)'),
+        choices=[
+            ('0',    _l('Off (no thinking)')),
+            ('100',  '100'),
+            ('500',  '500'),
+            ('2000', '2000'),
+        ],
+        default=str(LLM_DEFAULT_THINKING_BUDGET),
+        validators=[validators.Optional()],
+    )
+    llm_max_summary_tokens = SelectField(
+        _l('Max AI summary length (tokens)'),
+        choices=[
+            ('500',   '500'),
+            ('1000',  '1000'),
+            ('3000',  '3000'),
+            ('5000',  '5000'),
+            ('10000', '10000'),
+            ('15000', '15000'),
+        ],
+        default=str(LLM_DEFAULT_MAX_SUMMARY_TOKENS),
+        validators=[validators.Optional()],
+    )
+    llm_budget_action = RadioField(
+        _l('When monthly token budget is reached'),
+        choices=[
+            ('skip_llm',   _l('Skip AI summarisation only (watch still checks)')),
+            ('skip_check', _l('Skip the watch check entirely')),
+        ],
+        default='skip_llm',
+    )
+
+
 class globalSettingsForm(Form):
     # Define these as FormFields/"sub forms", this way it matches the JSON storage
     # datastore.data['settings']['application']..
@@ -1050,6 +1181,7 @@ class globalSettingsForm(Form):
 
     requests = FormField(globalSettingsRequestForm)
     application = FormField(globalSettingsApplicationForm)
+    llm = FormField(globalSettingsLLMForm)
     save_button = SubmitField(_l('Save'), render_kw={"class": "pure-button pure-button-primary"})
 
 

changedetectionio/html_tools.py

@@ -282,7 +282,7 @@ def xpath_filter(xpath_filter, html_content, append_pretty_line_formatting=False
     try:
         if is_xml:
             # So that we can keep CDATA for cdata_in_document_to_text() to process
-            parser = etree.XMLParser(strip_cdata=False)
+            parser = etree.XMLParser(strip_cdata=False, resolve_entities=False, no_network=True)
             # For XML/RSS content, use etree.fromstring to properly handle XML declarations
             tree = etree.fromstring(html_content.encode('utf-8') if isinstance(html_content, str) else html_content, parser=parser)
         else:
@@ -346,7 +346,7 @@ def xpath1_filter(xpath_filter, html_content, append_pretty_line_formatting=Fals
     try:
         if is_xml:
             # So that we can keep CDATA for cdata_in_document_to_text() to process
-            parser = etree.XMLParser(strip_cdata=False)
+            parser = etree.XMLParser(strip_cdata=False, resolve_entities=False, no_network=True)
             # For XML/RSS content, use etree.fromstring to properly handle XML declarations
             tree = etree.fromstring(html_content.encode('utf-8') if isinstance(html_content, str) else html_content, parser=parser)
         else:

changedetectionio/languages.py

@@ -28,18 +28,20 @@ def get_timeago_locale(flask_locale):
         str: timeago library locale code (e.g., 'en', 'zh_CN', 'pt_PT')
     """
     locale_map = {
-        'zh': 'zh_CN',      # Chinese Simplified
+        'zh': 'zh_CN',          # Chinese Simplified
         # timeago library just hasn't been updated to use the more modern locale naming convention, before BCP 47 / RFC 5646.
-        'zh_TW': 'zh_TW',   # Chinese Traditional (timeago uses zh_TW)
+        'zh_TW': 'zh_TW',       # Chinese Traditional (timeago uses zh_TW)
         'zh_Hant_TW': 'zh_TW',  # Flask-Babel normalizes zh_TW to zh_Hant_TW, map back to timeago's zh_TW
-        'pt': 'pt_PT',      # Portuguese (Portugal)
-        'sv': 'sv_SE',      # Swedish
-        'no': 'nb_NO',      # Norwegian Bokmål
-        'hi': 'in_HI',      # Hindi
-        'cs': 'en',         # Czech not supported by timeago, fallback to English
-        'uk': 'uk',         # Ukrainian
-        'en_GB': 'en',      # British English - timeago uses 'en'
-        'en_US': 'en',      # American English - timeago uses 'en'
+        'pt': 'pt_PT',          # Portuguese (Portugal)
+        'pt_BR': 'pt_BR',       # Portuguese (Brasil)
+        'sv': 'sv_SE',          # Swedish
+        'no': 'nb_NO',          # Norwegian Bokmål
+        'hi': 'in_HI',          # Hindi
+        'cs': 'en',             # Czech not supported by timeago, fallback to English
+        'ja': 'ja',             # Japanese
+        'uk': 'uk',             # Ukrainian
+        'en_GB': 'en',          # British English - timeago uses 'en'
+        'en_US': 'en',          # American English - timeago uses 'en'
     }
     return locale_map.get(flask_locale, flask_locale)
 
@@ -53,7 +55,8 @@ LANGUAGE_DATA = {
     'ko': {'flag': 'fi fi-kr fis', 'name': '한국어'},
     'cs': {'flag': 'fi fi-cz fis', 'name': 'Čeština'},
     'es': {'flag': 'fi fi-es fis', 'name': 'Español'},
-    'pt': {'flag': 'fi fi-pt fis', 'name': 'Português'},
+    'pt': {'flag': 'fi fi-pt fis', 'name': 'Português (Portugal)'},
+    'pt_BR': {'flag': 'fi fi-br fis', 'name': 'Português (Brasil)'},
     'it': {'flag': 'fi fi-it fis', 'name': 'Italiano'},
     'ja': {'flag': 'fi fi-jp fis', 'name': '日本語'},
     'zh': {'flag': 'fi fi-cn fis', 'name': '中文 (简体)'},

changedetectionio/llm/__init__.py

@@ -0,0 +1 @@
+# LLM intent-based change evaluation

changedetectionio/llm/bm25_trim.py

@@ -0,0 +1,52 @@
+"""
+BM25-based relevance trimming for large snapshot text.
+
+When a snapshot is large and no CSS pre-filter has narrowed it down,
+we use BM25 to select the lines most relevant to the user's intent
+before sending to the LLM. This keeps the context focused without
+an arbitrary char truncation.
+
+Pure functions — no side effects, fully testable.
+"""
+
+MAX_CONTEXT_CHARS = 15_000
+
+
+def trim_to_relevant(text: str, query: str, max_chars: int = MAX_CONTEXT_CHARS) -> str:
+    """
+    Return the lines from `text` most relevant to `query` up to `max_chars`.
+    If text fits within budget, return it unchanged.
+    Falls back to head-truncation if rank_bm25 is unavailable.
+    """
+    if not text or not query:
+        return text or ''
+
+    if len(text) <= max_chars:
+        return text
+
+    lines = [l for l in text.splitlines() if l.strip()]
+    if not lines:
+        return text[:max_chars]
+
+    try:
+        from rank_bm25 import BM25Okapi
+    except ImportError:
+        # rank-bm25 not installed — fall back to simple head truncation
+        return text[:max_chars]
+
+    tokenized = [line.lower().split() for line in lines]
+    bm25 = BM25Okapi(tokenized)
+    scores = bm25.get_scores(query.lower().split())
+
+    ranked = sorted(enumerate(zip(scores, lines)), key=lambda x: x[1][0], reverse=True)
+
+    selected_indices, total = [], 0
+    for idx, (_score, line) in ranked:
+        if total + len(line) + 1 > max_chars:
+            break
+        selected_indices.append(idx)
+        total += len(line) + 1
+
+    # Re-order selected lines to preserve original document order
+    ordered = [lines[i] for i in sorted(selected_indices)]
+    return '\n'.join(ordered)

changedetectionio/llm/client.py

@@ -0,0 +1,115 @@
+"""
+Thin wrapper around litellm.completion.
+Keeps litellm import isolated so the rest of the codebase doesn't depend on it directly,
+and makes the call easy to mock in tests.
+"""
+
+import os
+from loguru import logger
+
+# Default output token cap for JSON-returning calls (intent eval, preview, setup).
+# These return small JSON objects — 400 is enough for a verbose explanation while
+# still preventing runaway cost. Change summaries pass their own max_tokens via
+# _summary_max_tokens() and are NOT subject to this cap.
+_MAX_COMPLETION_TOKENS = 400
+
+DEFAULT_TIMEOUT = int(os.getenv('LLM_TIMEOUT', 60))
+DEFAULT_RETRIES = 3
+
+
+def completion(model: str, messages: list, api_key: str = None,
+               api_base: str = None, timeout: int = DEFAULT_TIMEOUT,
+               max_tokens: int = None, extra_body: dict = None) -> tuple[str, int, int, int]:
+    """
+    Call the LLM and return (response_text, total_tokens, input_tokens, output_tokens).
+    Retries up to DEFAULT_RETRIES times on timeout or connection errors.
+    Token counts are 0 if the provider doesn't return usage data.
+    Raises on network/auth errors — callers handle gracefully.
+    """
+    try:
+        import litellm
+    except ImportError:
+        raise RuntimeError("litellm is not installed. Add it to requirements.txt.")
+
+    _timeout = timeout if timeout is not None else DEFAULT_TIMEOUT
+
+    kwargs = {
+        'model': model,
+        'messages': messages,
+        'timeout': _timeout,
+        'temperature': 0,
+        'max_tokens': max_tokens if max_tokens is not None else _MAX_COMPLETION_TOKENS,
+    }
+    if api_key:
+        kwargs['api_key'] = api_key
+    if api_base:
+        kwargs['api_base'] = api_base
+    if extra_body:
+        kwargs['extra_body'] = extra_body
+
+    _retryable = (litellm.Timeout, litellm.APIConnectionError)
+
+    for attempt in range(1, DEFAULT_RETRIES + 1):
+        try:
+            response = litellm.completion(**kwargs)
+            choice   = response.choices[0]
+            message  = choice.message
+            finish   = getattr(choice, 'finish_reason', None)
+
+            text = message.content or ''
+
+            if not text:
+                # Some providers (e.g. Gemini) put text in message.parts instead of .content
+                parts = getattr(message, 'parts', None)
+                if parts:
+                    text = ''.join(getattr(p, 'text', '') or '' for p in parts).strip()
+                    logger.debug(f"LLM client: extracted text from message.parts ({len(parts)} parts) model={model!r}")
+
+            if finish == 'length':
+                logger.warning(
+                    f"LLM client: response truncated (finish_reason='length') model={model!r} "
+                    f"— increase max_tokens; got {len(text)} chars so far"
+                )
+
+            if not text:
+                logger.warning(
+                    f"LLM client: empty content from model={model!r} "
+                    f"finish_reason={finish!r} "
+                    f"message={message!r}"
+                )
+
+            usage = getattr(response, 'usage', None)
+            input_tokens  = int(getattr(usage, 'prompt_tokens',     0) or 0) if usage else 0
+            output_tokens = int(getattr(usage, 'completion_tokens', 0) or 0) if usage else 0
+            total_tokens  = int(getattr(usage, 'total_tokens',      0) or 0) if usage else (input_tokens + output_tokens)
+            logger.debug(
+                f"LLM client: model={model!r} finish={finish!r} "
+                f"tokens={total_tokens} (in={input_tokens} out={output_tokens}) "
+                f"text_len={len(text)}"
+            )
+            return text, total_tokens, input_tokens, output_tokens
+
+        except _retryable as e:
+            # litellm formats its Timeout message with None when the provider doesn't
+            # propagate the timeout value — patch the exception args in-place so every
+            # caller that logs str(e) sees the real number.
+            _fix = f'after {_timeout} seconds'
+            try:
+                e.args = tuple(str(a).replace('after None seconds', _fix) for a in e.args)
+            except Exception:
+                pass
+            if attempt < DEFAULT_RETRIES:
+                logger.warning(
+                    f"LLM call timed out/connection error (attempt {attempt}/{DEFAULT_RETRIES}), "
+                    f"retrying — model={model!r} timeout={_timeout}s error={e}"
+                )
+                continue
+            logger.warning(
+                f"LLM call failed after {DEFAULT_RETRIES} attempts ({_timeout}s timeout) "
+                f"model={model!r} error={e}"
+            )
+            raise
+
+        except Exception as e:
+            logger.warning(f"LLM call failed: model={model!r} error={e}")
+            raise

changedetectionio/llm/evaluator.py

@@ -0,0 +1,611 @@
+"""
+LLM evaluation orchestration.
+
+Two public entry points:
+  - run_setup(watch, datastore)        — one-time: decide if pre-filter needed
+  - evaluate_change(watch, datastore, diff, current_snapshot) — per-change evaluation
+
+Intent resolution: watch.llm_intent → first tag with llm_intent → None (no evaluation)
+Cache: each (intent, diff) pair is evaluated exactly once, result stored in watch.
+
+Environment variable overrides (take priority over datastore settings):
+  LLM_MODEL    — model string (e.g. "gpt-4o-mini", "ollama/llama3.2")
+  LLM_API_KEY  — API key for cloud providers
+  LLM_API_BASE — base URL for local/custom endpoints (e.g. http://localhost:11434)
+"""
+
+import hashlib
+import os
+from datetime import datetime, timezone
+from loguru import logger
+
+from . import client as llm_client
+from .prompt_builder import (
+    build_change_summary_prompt, build_change_summary_system_prompt,
+    build_eval_prompt, build_eval_system_prompt,
+    build_preview_prompt, build_preview_system_prompt,
+    build_setup_prompt, build_setup_system_prompt,
+)
+from .response_parser import parse_eval_response, parse_preview_response, parse_setup_response
+
+_DEFAULT_MAX_INPUT_CHARS = 100_000
+
+def _get_max_input_chars(datastore) -> int:
+    """Max input characters to send to the LLM. Resolution: env var → datastore → 100,000.
+    Always returns at least 1 — unlimited is not permitted.
+    """
+    env_val = os.getenv('LLM_MAX_INPUT_CHARS', '').strip()
+    if env_val.isdigit() and int(env_val) > 0:
+        return int(env_val)
+    cfg = datastore.data.get('settings', {}).get('application', {}).get('llm') or {}
+    stored = cfg.get('max_input_chars')
+    if stored and int(stored) > 0:
+        return int(stored)
+    return _DEFAULT_MAX_INPUT_CHARS
+
+
+class LLMInputTooLargeError(Exception):
+    pass
+
+
+def _check_input_size(text: str, max_chars: int) -> None:
+    """Raise LLMInputTooLargeError if text exceeds max_chars."""
+    if len(text) > max_chars:
+        raise LLMInputTooLargeError(
+            f"Change too large for AI summary ({len(text):,} chars, limit {max_chars:,})"
+        )
+
+
+LLM_DEFAULT_THINKING_BUDGET = 0  # 0 = thinking disabled by default
+
+def _thinking_extra_body(model: str, budget: int) -> dict | None:
+    """Return litellm extra_body to control thinking for models that support it.
+    For Gemini 2.5+: passes thinkingConfig with the given budget (0 = disabled).
+    For all other models: returns None (no-op).
+    """
+    if not model.startswith('gemini/gemini-2.5'):
+        return None
+    return {'generationConfig': {'thinkingConfig': {'thinkingBudget': budget}}}
+
+
+def _cached_system(text: str, model: str = '') -> dict:
+    """Wrap a system prompt, adding Anthropic prompt-caching headers only for Anthropic models.
+    Gemini and other providers have their own caching APIs that break when they receive
+    cache_control, so we only apply it where it's supported.
+    """
+    is_anthropic = model.startswith('claude') or model.startswith('anthropic/')
+    if is_anthropic:
+        return {'role': 'system', 'content': [{'type': 'text', 'text': text, 'cache_control': {'type': 'ephemeral'}}]}
+    return {'role': 'system', 'content': text}
+
+
+LLM_DEFAULT_MAX_SUMMARY_TOKENS = 3000
+
+# Default prompt used when the user hasn't configured llm_change_summary
+DEFAULT_CHANGE_SUMMARY_PROMPT = "Describe in plain English what changed — list what was added or removed as bullet points, including key details for each item. Be careful of content that merely just moved around, you should mention that it moved but dont report that it was added/removed etc. Be considerate of the style content you are summarising the change of, adjust your report accordingly. Do not quote non-English text verbatim; translate and summarise all content into English. Your entire response must be in English."
+
+
+def _summary_max_tokens(diff: str, max_cap: int = LLM_DEFAULT_MAX_SUMMARY_TOKENS) -> int:
+    """Scale completion tokens to diff size: floor 400, ~1 token per 4 chars, ceiling max_cap."""
+    return max(400, min(len(diff) // 4, max_cap))
+
+
+# ---------------------------------------------------------------------------
+# Intent resolution
+# ---------------------------------------------------------------------------
+
+def resolve_llm_field(watch, datastore, field: str) -> tuple[str, str]:
+    """
+    Generic cascade resolver for any LLM per-watch field.
+    Returns (value, source) where source is 'watch' or tag title.
+    Returns ('', '') if not set anywhere.
+    """
+    value = (watch.get(field) or '').strip()
+    if value:
+        return value, 'watch'
+
+    for tag_uuid in watch.get('tags', []):
+        tag = datastore.data['settings']['application'].get('tags', {}).get(tag_uuid)
+        if tag:
+            tag_value = (tag.get(field) or '').strip()
+            if tag_value:
+                return tag_value, tag.get('title', 'tag')
+
+    return '', ''
+
+
+def resolve_intent(watch, datastore) -> tuple[str, str]:
+    """
+    Return (intent, source) where source is 'watch' or tag title.
+    Returns ('', '') if no intent is configured anywhere.
+    """
+    intent = (watch.get('llm_intent') or '').strip()
+    if intent:
+        return intent, 'watch'
+
+    for tag_uuid in watch.get('tags', []):
+        tag = datastore.data['settings']['application'].get('tags', {}).get(tag_uuid)
+        if tag:
+            tag_intent = (tag.get('llm_intent') or '').strip()
+            if tag_intent:
+                return tag_intent, tag.get('title', 'tag')
+
+    return '', ''
+
+
+# ---------------------------------------------------------------------------
+# LLM config helper
+# ---------------------------------------------------------------------------
+
+def get_llm_config(datastore) -> dict | None:
+    """
+    Return LLM config dict or None if not configured.
+
+    Resolution order (first non-empty model wins):
+      1. Environment variables: LLM_MODEL, LLM_API_KEY, LLM_API_BASE
+      2. Datastore settings (set via UI)
+    """
+    # 1. Environment variable override
+    env_model = os.getenv('LLM_MODEL', '').strip()
+    if env_model:
+        return {
+            'model': env_model,
+            'api_key': os.getenv('LLM_API_KEY', '').strip(),
+            'api_base': os.getenv('LLM_API_BASE', '').strip(),
+        }
+
+    # 2. Datastore settings
+    cfg = datastore.data['settings']['application'].get('llm') or {}
+    if not cfg.get('model'):
+        return None
+    return cfg
+
+
+def llm_configured_via_env() -> bool:
+    """True when LLM config comes from environment variables, not the UI."""
+    return bool(os.getenv('LLM_MODEL', '').strip())
+
+
+# ---------------------------------------------------------------------------
+# Global monthly token budget
+# ---------------------------------------------------------------------------
+
+def _get_month_key() -> str:
+    """Returns 'YYYY-MM' for the current UTC month."""
+    return datetime.now(timezone.utc).strftime("%Y-%m")
+
+
+def get_global_token_budget_month(datastore=None) -> int:
+    """
+    Monthly token budget ceiling. Resolution order:
+      1. LLM_TOKEN_BUDGET_MONTH env var (takes priority, makes field read-only in UI)
+      2. datastore settings (set via UI)
+    Returns 0 (no limit) if not set anywhere.
+    """
+    try:
+        env_val = int(os.getenv('LLM_TOKEN_BUDGET_MONTH', '0'))
+        if env_val > 0:
+            return env_val
+    except (ValueError, TypeError):
+        pass
+    if datastore is not None:
+        try:
+            stored = datastore.data['settings']['application'].get('llm') or {}
+            val = int(stored.get('token_budget_month') or 0)
+            return max(0, val)
+        except (ValueError, TypeError):
+            pass
+    return 0
+
+
+def _estimate_cost_usd(model: str, input_tokens: int, output_tokens: int) -> float:
+    """
+    Return estimated cost in USD using litellm's pricing database.
+    Returns 0.0 for unknown models (local/Ollama/custom endpoints).
+    Never raises — cost estimation is best-effort.
+    """
+    if not model or (not input_tokens and not output_tokens):
+        return 0.0
+    try:
+        from litellm.cost_calculator import cost_per_token
+        prompt_cost, completion_cost = cost_per_token(
+            model=model,
+            prompt_tokens=input_tokens,
+            completion_tokens=output_tokens,
+        )
+        return float(prompt_cost + completion_cost)
+    except Exception:
+        return 0.0
+
+
+def accumulate_global_tokens(datastore, tokens: int,
+                              input_tokens: int = 0, output_tokens: int = 0,
+                              model: str = '') -> None:
+    """
+    Add *tokens* to both the all-time and this-month global counters.
+    When input_tokens / output_tokens / model are supplied the estimated
+    USD cost is accumulated alongside the token counts.
+    Resets monthly counters automatically on month rollover.
+
+    These counters live at datastore.data['settings']['application']['llm']
+    and are intentionally read-only from the API/form side — they are only
+    ever written here, in a controlled way.
+    """
+    if tokens <= 0:
+        return
+
+    current_month = _get_month_key()
+    cost = _estimate_cost_usd(model, input_tokens, output_tokens)
+
+    # Work on the live dict in-place (or create a stub if llm key is absent)
+    app_settings = datastore.data['settings']['application']
+    if 'llm' not in app_settings:
+        app_settings['llm'] = {}
+    llm_cfg = app_settings['llm']
+
+    # Month rollover: reset monthly counters
+    if llm_cfg.get('tokens_month_key') != current_month:
+        llm_cfg['tokens_this_month'] = 0
+        llm_cfg['cost_usd_this_month'] = 0.0
+        llm_cfg['tokens_month_key'] = current_month
+
+    llm_cfg['tokens_total_cumulative'] = (llm_cfg.get('tokens_total_cumulative') or 0) + tokens
+    llm_cfg['tokens_this_month']       = (llm_cfg.get('tokens_this_month') or 0) + tokens
+    llm_cfg['cost_usd_total_cumulative'] = (llm_cfg.get('cost_usd_total_cumulative') or 0.0) + cost
+    llm_cfg['cost_usd_this_month']       = (llm_cfg.get('cost_usd_this_month') or 0.0) + cost
+
+    # Persist immediately — token accounting must survive restarts
+    datastore.commit()
+
+
+def is_global_token_budget_exceeded(datastore) -> bool:
+    """
+    Returns True when a monthly token budget is configured (via
+    LLM_TOKEN_BUDGET_MONTH) and the current month's usage has reached
+    or exceeded that budget.
+    """
+    budget = get_global_token_budget_month(datastore)
+    if not budget:
+        return False
+
+    llm_cfg = datastore.data['settings']['application'].get('llm') or {}
+    if llm_cfg.get('tokens_month_key') != _get_month_key():
+        # Counter hasn't been updated yet this month → zero usage
+        return False
+
+    return (llm_cfg.get('tokens_this_month') or 0) >= budget
+
+
+# ---------------------------------------------------------------------------
+# One-time setup: derive pre-filter
+# ---------------------------------------------------------------------------
+
+def _check_token_budget(watch, cfg, tokens_this_call: int = 0) -> bool:
+    """
+    Check token budget limits.  Returns True if within budget, False if exceeded.
+    Also accumulates tokens_this_call into watch['llm_tokens_used_cumulative'].
+    """
+    if tokens_this_call > 0:
+        current = watch.get('llm_tokens_used_cumulative') or 0
+        watch['llm_tokens_used_cumulative'] = current + tokens_this_call
+
+    max_per_check = int(cfg.get('max_tokens_per_check') or 0)
+    max_cumulative = int(cfg.get('max_tokens_cumulative') or 0)
+
+    if max_per_check and tokens_this_call > max_per_check:
+        logger.warning(
+            f"LLM token budget exceeded for {watch.get('uuid')}: "
+            f"{tokens_this_call} tokens > per-check limit {max_per_check}"
+        )
+        return False
+
+    if max_cumulative:
+        total = watch.get('llm_tokens_used_cumulative') or 0
+        if total > max_cumulative:
+            logger.warning(
+                f"LLM cumulative token budget exceeded for {watch.get('uuid')}: "
+                f"{total} tokens > limit {max_cumulative}"
+            )
+            return False
+
+    return True
+
+
+def run_setup(watch, datastore, snapshot_text: str) -> None:
+    """
+    Ask the LLM whether a CSS pre-filter would improve precision for this intent.
+    Stores result in watch['llm_prefilter'] (str selector or None).
+    Called once when intent is first set, and again if pre-filter returns zero matches.
+    """
+    cfg = get_llm_config(datastore)
+    if not cfg:
+        return
+
+    intent, _ = resolve_intent(watch, datastore)
+    if not intent:
+        return
+
+    url = watch.get('url', '')
+    system_prompt = build_setup_system_prompt()
+    user_prompt = build_setup_prompt(intent, snapshot_text, url=url)
+
+    try:
+        raw, tokens, *_ = llm_client.completion(
+            model=cfg['model'],
+            messages=[
+                _cached_system(system_prompt, model=cfg['model']),
+                {'role': 'user', 'content': user_prompt},
+            ],
+            api_key=cfg.get('api_key'),
+            api_base=cfg.get('api_base'),
+            extra_body=_thinking_extra_body(cfg['model'], int(datastore.data['settings']['application'].get('llm_thinking_budget', LLM_DEFAULT_THINKING_BUDGET) or 0)),
+        )
+        _check_token_budget(watch, cfg, tokens)
+        accumulate_global_tokens(datastore, tokens, model=cfg['model'])
+        result = parse_setup_response(raw)
+        watch['llm_prefilter'] = result['selector']
+        logger.debug(f"LLM setup for {watch.get('uuid')}: prefilter={result['selector']} reason={result['reason']}")
+    except Exception as e:
+        logger.warning(f"LLM setup call failed for {watch.get('uuid')}: {e}")
+        watch['llm_prefilter'] = None
+
+
+# ---------------------------------------------------------------------------
+# AI Change Summary — human-readable description of what changed
+# ---------------------------------------------------------------------------
+
+def get_effective_summary_prompt(watch, datastore) -> str:
+    """Return the prompt that summarise_change will use.
+
+    Cascade: watch → tag → global settings default → hardcoded fallback.
+    """
+    prompt, _ = resolve_llm_field(watch, datastore, 'llm_change_summary')
+    if prompt:
+        return prompt
+    global_default = (
+        datastore.data.get('settings', {})
+        .get('application', {})
+        .get('llm_change_summary_default', '') or ''
+    ).strip()
+    return global_default or DEFAULT_CHANGE_SUMMARY_PROMPT
+
+
+def compute_summary_cache_key(diff_text: str, prompt: str) -> str:
+    """Stable 16-char hex key for a (diff, prompt) pair.  Stored alongside the summary file."""
+    h = hashlib.md5()
+    h.update(diff_text.encode('utf-8', errors='replace'))
+    h.update(b'\x00')
+    h.update(prompt.encode('utf-8', errors='replace'))
+    return h.hexdigest()[:16]
+
+
+def summarise_change(watch, datastore, diff: str, current_snapshot: str = '') -> str:
+    """
+    Generate a plain-language summary of the change using the watch's
+    llm_change_summary prompt (cascades from tag if not set on watch).
+
+    Returns the summary string, or '' on failure.
+    The result replaces {{ diff }} in notifications so the user gets a
+    readable description instead of raw +/- diff lines.
+    """
+    cfg = get_llm_config(datastore)
+    if not cfg:
+        return ''
+
+    if is_global_token_budget_exceeded(datastore):
+        budget = get_global_token_budget_month(datastore)
+        llm_cfg = datastore.data['settings']['application'].get('llm') or {}
+        used = llm_cfg.get('tokens_this_month', 0)
+        logger.warning(
+            f"LLM summarise_change skipped: monthly budget {budget:,} reached "
+            f"({used:,} used this month)"
+        )
+        return ''
+
+    custom_prompt = get_effective_summary_prompt(watch, datastore)
+    if not diff.strip():
+        return ''
+
+    _check_input_size(diff, _get_max_input_chars(datastore))
+    url = watch.get('url', '')
+    title = watch.get('page_title') or watch.get('title') or ''
+
+    system_prompt = build_change_summary_system_prompt()
+    user_prompt = build_change_summary_prompt(
+        diff=diff,
+        custom_prompt=custom_prompt,
+        current_snapshot=current_snapshot,
+        url=url,
+        title=title,
+    )
+
+    _thinking_budget = int(datastore.data['settings']['application'].get('llm_thinking_budget', LLM_DEFAULT_THINKING_BUDGET) or 0)
+    _extra_body = _thinking_extra_body(cfg['model'], _thinking_budget)
+
+    try:
+        _resp = llm_client.completion(
+            model=cfg['model'],
+            messages=[
+                _cached_system(system_prompt, model=cfg['model']),
+                {'role': 'user', 'content': user_prompt},
+            ],
+            api_key=cfg.get('api_key'),
+            api_base=cfg.get('api_base'),
+            max_tokens=_summary_max_tokens(
+                diff,
+                max_cap=int(datastore.data['settings']['application'].get('llm_max_summary_tokens', LLM_DEFAULT_MAX_SUMMARY_TOKENS) or LLM_DEFAULT_MAX_SUMMARY_TOKENS),
+            ),
+            extra_body=_extra_body,
+        )
+        raw, tokens = _resp[0], _resp[1]
+        input_tokens  = _resp[2] if len(_resp) > 2 else 0
+        output_tokens = _resp[3] if len(_resp) > 3 else 0
+        summary = raw.strip()
+        _check_token_budget(watch, cfg, tokens)
+        watch['llm_last_tokens_used'] = tokens
+        watch['llm_tokens_used_cumulative'] = (watch.get('llm_tokens_used_cumulative') or 0) + tokens
+        accumulate_global_tokens(datastore, tokens,
+                                 input_tokens=input_tokens,
+                                 output_tokens=output_tokens,
+                                 model=cfg['model'])
+        logger.debug(
+            f"LLM change summary {watch.get('uuid')}: tokens={tokens} "
+            f"summary={summary[:80]}"
+        )
+        return summary
+    except Exception as e:
+        raise
+
+
+# ---------------------------------------------------------------------------
+# Live-preview extraction (current content, no diff)
+# ---------------------------------------------------------------------------
+
+def preview_extract(watch, datastore, content: str) -> dict | None:
+    """
+    For the live-preview endpoint: extract relevant information from the
+    *current* page content according to the watch's intent.
+
+    Unlike evaluate_change (which compares a diff), this asks the LLM to
+    directly answer the intent against the current snapshot — giving the user
+    immediate feedback like "30 articles listed" or "Price: $149, 25% off".
+
+    Returns {'found': bool, 'answer': str} or None if LLM not configured / no intent.
+    """
+    cfg = get_llm_config(datastore)
+    if not cfg:
+        return None
+
+    intent, _ = resolve_intent(watch, datastore)
+    if not intent or not content.strip():
+        return None
+
+    _check_input_size(content, _get_max_input_chars(datastore))
+    url = watch.get('url', '')
+    title = watch.get('page_title') or watch.get('title') or ''
+
+    system_prompt = build_preview_system_prompt()
+    user_prompt = build_preview_prompt(intent, content, url=url, title=title)
+
+    try:
+        raw, tokens, *_ = llm_client.completion(
+            model=cfg['model'],
+            messages=[
+                _cached_system(system_prompt, model=cfg['model']),
+                {'role': 'user', 'content': user_prompt},
+            ],
+            api_key=cfg.get('api_key'),
+            api_base=cfg.get('api_base'),
+            extra_body=_thinking_extra_body(cfg['model'], int(datastore.data['settings']['application'].get('llm_thinking_budget', LLM_DEFAULT_THINKING_BUDGET) or 0)),
+        )
+        accumulate_global_tokens(datastore, tokens, model=cfg['model'])
+        result = parse_preview_response(raw)
+        logger.debug(
+            f"LLM preview {watch.get('uuid')}: found={result['found']} "
+            f"tokens={tokens} answer={result['answer'][:80]}"
+        )
+        return result
+    except Exception as e:
+        logger.warning(f"LLM preview extraction failed for {watch.get('uuid')}: {e}")
+        return None
+
+
+# ---------------------------------------------------------------------------
+# Per-change evaluation
+# ---------------------------------------------------------------------------
+
+def evaluate_change(watch, datastore, diff: str, current_snapshot: str = '') -> dict | None:
+    """
+    Evaluate whether `diff` matches the watch's intent.
+    Returns {'important': bool, 'summary': str} or None if LLM not configured / no intent.
+
+    Results are cached by (intent, diff) hash — each unique diff is evaluated exactly once.
+    """
+    cfg = get_llm_config(datastore)
+    if not cfg:
+        return None
+
+    intent, source = resolve_intent(watch, datastore)
+    if not intent:
+        return None
+
+    if not diff or not diff.strip():
+        return {'important': False, 'summary': ''}
+
+    _check_input_size(diff, _get_max_input_chars(datastore))
+
+    # Cache lookup — evaluations are deterministic once cached
+    cache_key = hashlib.sha256(f"{intent}||{diff}".encode()).hexdigest()
+    cache = watch.get('llm_evaluation_cache') or {}
+    if cache_key in cache:
+        logger.debug(f"LLM cache hit for {watch.get('uuid')} key={cache_key[:8]}")
+        return cache[cache_key]
+
+    # Check global monthly budget before making the call
+    if is_global_token_budget_exceeded(datastore):
+        budget = get_global_token_budget_month(datastore)
+        llm_cfg = datastore.data['settings']['application'].get('llm') or {}
+        used = llm_cfg.get('tokens_this_month', 0)
+        logger.warning(
+            f"LLM evaluate_change skipped for {watch.get('uuid')}: monthly budget {budget:,} reached "
+            f"({used:,} used this month) — passing change through as important"
+        )
+        # Fail open: don't suppress notifications when budget is exhausted
+        return {'important': True, 'summary': ''}
+
+    # Check per-watch cumulative budget before making the call
+    if not _check_token_budget(watch, cfg):
+        # Already over budget — fail open (don't suppress notification)
+        return {'important': True, 'summary': ''}
+
+    url = watch.get('url', '')
+    title = watch.get('page_title') or watch.get('title') or ''
+
+    system_prompt = build_eval_system_prompt()
+    user_prompt = build_eval_prompt(
+        intent=intent,
+        diff=diff,
+        current_snapshot=current_snapshot,
+        url=url,
+        title=title,
+    )
+
+    try:
+        _resp = llm_client.completion(
+            model=cfg['model'],
+            messages=[
+                _cached_system(system_prompt, model=cfg['model']),
+                {'role': 'user', 'content': user_prompt},
+            ],
+            api_key=cfg.get('api_key'),
+            api_base=cfg.get('api_base'),
+            extra_body=_thinking_extra_body(cfg['model'], int(datastore.data['settings']['application'].get('llm_thinking_budget', LLM_DEFAULT_THINKING_BUDGET) or 0)),
+        )
+        raw, tokens = _resp[0], _resp[1]
+        input_tokens  = _resp[2] if len(_resp) > 2 else 0
+        output_tokens = _resp[3] if len(_resp) > 3 else 0
+        result = parse_eval_response(raw)
+    except Exception as e:
+        logger.warning(f"LLM evaluation failed for {watch.get('uuid')}: {e}")
+        # On failure: don't suppress the notification — pass through as important
+        watch['llm_last_tokens_used'] = 0
+        return {'important': True, 'summary': ''}
+
+    # Accumulate token usage: per-watch limit and global monthly budget
+    _check_token_budget(watch, cfg, tokens)
+    watch['llm_last_tokens_used'] = tokens
+    accumulate_global_tokens(datastore, tokens,
+                             input_tokens=input_tokens,
+                             output_tokens=output_tokens,
+                             model=cfg['model'])
+
+    # Store in cache
+    if 'llm_evaluation_cache' not in watch or watch['llm_evaluation_cache'] is None:
+        watch['llm_evaluation_cache'] = {}
+    watch['llm_evaluation_cache'][cache_key] = result
+
+    logger.debug(
+        f"LLM eval {watch.get('uuid')} (intent from {source}): "
+        f"important={result['important']} tokens={tokens} summary={result['summary'][:80]}"
+    )
+    return result

changedetectionio/llm/prompt_builder.py

@@ -0,0 +1,212 @@
+"""
+Prompt construction for LLM evaluation calls.
+Pure functions — no side effects, fully testable.
+"""
+
+import re
+
+from .bm25_trim import trim_to_relevant
+
+_AGO_RE = re.compile(r'^\d+\s+\w+\s+ago$', re.IGNORECASE)
+
+SNAPSHOT_CONTEXT_CHARS = 3_000   # current page state excerpt sent alongside the diff
+
+
+def _annotate_moved_lines(diff_text: str) -> str:
+    """
+    Pre-process a unified diff to mark lines that appear on both the + and - sides
+    as [MOVED] rather than genuinely added/removed. This prevents the LLM from
+    incorrectly classifying repositioned content as new or deleted.
+
+    Lines are compared after stripping leading +/- and whitespace so that
+    indentation changes don't prevent matching.
+    """
+    lines = diff_text.splitlines()
+    added_texts   = {l[1:].strip().lower() for l in lines if l.startswith('+') and l[1:].strip()}
+    removed_texts = {l[1:].strip().lower() for l in lines if l.startswith('-') and l[1:].strip()}
+    moved_texts   = added_texts & removed_texts
+
+    if not moved_texts:
+        return diff_text
+
+    result = []
+    for line in lines:
+        if line.startswith(('+', '-')):
+            bare = line[1:].strip().lower()
+            if bare in moved_texts or _AGO_RE.match(line[1:].strip()):
+                result.append(f'~{line[1:]}')  # ~ prefix = moved/reordered/trivial, skip
+                continue
+        result.append(line)
+    return '\n'.join(result)
+
+
+def build_eval_prompt(intent: str, diff: str, current_snapshot: str = '',
+                      url: str = '', title: str = '') -> str:
+    """
+    Build the user message for a diff evaluation call.
+    The system prompt is kept separate (see build_eval_system_prompt).
+    """
+    parts = []
+
+    if url:
+        parts.append(f"URL: {url}")
+    if title:
+        parts.append(f"Page title: {title}")
+
+    parts.append(f"Intent: {intent}")
+
+    if current_snapshot:
+        excerpt = trim_to_relevant(current_snapshot, intent, max_chars=SNAPSHOT_CONTEXT_CHARS)
+        if excerpt:
+            parts.append(f"\nCurrent page state (relevant excerpt):\n{excerpt}")
+
+    parts.append(f"\nWhat changed (diff):\n{diff}")
+
+    return '\n'.join(parts)
+
+
+def build_eval_system_prompt() -> str:
+    return (
+        "You are a precise, reliable website-change evaluator for a monitoring tool.\n"
+        "Your job is to read a unified diff and decide whether it matches a user's stated intent.\n"
+        "Accuracy is critical — false positives waste the user's attention; false negatives miss what they care about.\n\n"
+        "Diff format:\n"
+        "- Lines starting with '+' are newly ADDED content\n"
+        "- Lines starting with '-' are REMOVED content\n"
+        "- Lines starting with ' ' (space) are unchanged context\n\n"
+        "Respond with ONLY a JSON object — no markdown, no explanation outside it:\n"
+        '{"important": true/false, "summary": "one sentence describing the relevant change, or why it doesn\'t match"}\n\n'
+        "Rules:\n"
+        "- important=true ONLY when the diff clearly and specifically matches the intent — be strict\n"
+        "- Pay close attention to direction: an intent about price drops means removed (-) prices and added (+) lower prices\n"
+        "- Empty, trivial, or cosmetic diffs (timestamps, counters, whitespace, navigation) → important=false\n"
+        "- If the same text appears in both removed (-) and added (+) lines the content has likely just "
+        "shifted or been reordered. Treat pure reordering as important=false unless the intent "
+        "explicitly asks about order or position.\n"
+        "- Use OR logic when the intent lists multiple triggers — any one matching is sufficient\n"
+        "- When uncertain whether a change truly matches, prefer important=false and explain why in the summary\n"
+        "- Summary must be in the same language as the intent\n"
+        "- If important=false, the summary must clearly explain what changed and why it does not match"
+    )
+
+
+def build_preview_prompt(intent: str, content: str, url: str = '', title: str = '') -> str:
+    """
+    Build the user message for a live-preview extraction call.
+    Unlike build_eval_prompt (which analyses a diff), this asks the LLM to
+    extract relevant information from the *current* page content — giving the
+    user a direct answer to their intent so they can verify it makes sense
+    before saving.
+    """
+    parts = []
+    if url:
+        parts.append(f"URL: {url}")
+    if title:
+        parts.append(f"Page title: {title}")
+    parts.append(f"Intent / question: {intent}")
+    parts.append(f"\nPage content:\n{content[:6_000]}")
+    return '\n'.join(parts)
+
+
+def build_preview_system_prompt() -> str:
+    return (
+        "You are a precise, detail-oriented web page content analyst for a website monitoring tool.\n"
+        "Given the user's intent or question and the current page content, extract and directly answer "
+        "what the intent is looking for. Never guess or paraphrase — report only what the page actually contains.\n\n"
+        "Respond with ONLY a JSON object — no markdown, no explanation outside it:\n"
+        '{"found": true/false, "answer": "concise direct answer or extraction"}\n\n'
+        "Rules:\n"
+        "- found=true when the page clearly contains something relevant to the intent\n"
+        "- answer must directly address the intent with specific values where possible "
+        "(e.g. for 'current price?' → '$149.99', not 'a price is shown')\n"
+        "- answer must be in the same language as the intent\n"
+        "- Keep answer brief — one or two sentences maximum\n"
+        "- If found=false, briefly state what the page contains instead"
+    )
+
+
+def build_change_summary_prompt(diff: str, custom_prompt: str,
+                                current_snapshot: str = '', url: str = '', title: str = '') -> str:
+    """
+    Build the user message for an AI Change Summary call.
+    The user supplies their own instructions (custom_prompt); this wraps them
+    with the diff and optional page context.
+    """
+    parts = []
+    if url:
+        parts.append(f"URL: {url}")
+    if title:
+        parts.append(f"Page title: {title}")
+    parts.append(f"Instructions: {custom_prompt}")
+    if current_snapshot:
+        excerpt = trim_to_relevant(current_snapshot, custom_prompt, max_chars=2_000)
+        if excerpt:
+            parts.append(f"\nCurrent page (excerpt):\n{excerpt}")
+    parts.append(f"\nWhat changed (diff):\n{_annotate_moved_lines(diff)}")
+    return '\n'.join(parts)
+
+
+def build_change_summary_system_prompt() -> str:
+    return (
+        "You are a meticulous, accurate summariser of website changes for monitoring notifications.\n"
+        "Your goal is to describe exactly what changed — never omit significant details, "
+        "never add information that isn't in the diff, and never speculate.\n\n"
+        "Rules for reading the diff:\n"
+        "- Lines starting with + are genuinely new content. List them specifically.\n"
+        "- Lines starting with - are genuinely removed content. List them specifically.\n"
+        "- Lines starting with ~ have been PRE-IDENTIFIED as moved/reordered or trivial — "
+        "the same text exists on both sides of the diff, or the line is a standalone timestamp. "
+        "Do NOT report ~ lines as added or removed. "
+        "If many ~ lines exist, note briefly that some content was reordered.\n"
+        "- Never list standalone timestamps like '3 hours ago', 'Yesterday', '2 minutes ago' "
+        "as added or removed items — they are not meaningful content changes.\n"
+        "For content-heavy pages (news, listings, feeds): quote or paraphrase the specific new "
+        "headlines, items, or entries that were added — do not collapse them into vague phrases "
+        "like 'new articles were added' or 'section was expanded'.\n"
+        "For large blocks of new text (full articles, documents, long paragraphs): briefly summarise "
+        "the substance in 1-2 sentences capturing the key point — do not just repeat the title.\n\n"
+        "Structure your response using these sections, in this fixed order — "
+        "omit a section entirely if there is nothing to report for it:\n"
+        "  Added: ...\n"
+        "  Changed: ...\n"
+        "  Removed: ...\n"
+        "The Removed section MUST always be last. Never place removals before additions or changes.\n\n"
+        "Follow the user's formatting instructions exactly for structure, language, and length.\n"
+        "Respond with ONLY the summary text — no JSON, no markdown code fences, no preamble. "
+        "Just the description."
+    )
+
+
+def build_setup_prompt(intent: str, snapshot_text: str, url: str = '') -> str:
+    """
+    Build the prompt for the one-time setup call that decides whether
+    a CSS pre-filter would improve evaluation precision.
+    """
+    excerpt = trim_to_relevant(snapshot_text, intent, max_chars=4_000)
+
+    parts = []
+    if url:
+        parts.append(f"URL: {url}")
+    parts.append(f"Intent: {intent}")
+    parts.append(f"\nPage content excerpt:\n{excerpt}")
+
+    return '\n'.join(parts)
+
+
+def build_setup_system_prompt() -> str:
+    return (
+        "You help configure a website change monitor.\n"
+        "Given a monitoring intent and a sample of the page content, decide if a CSS pre-filter "
+        "would improve evaluation precision by scoping the content to a specific structural section.\n\n"
+        "Respond with ONLY a JSON object:\n"
+        '{"needs_prefilter": true/false, "selector": "CSS selector or null", "reason": "one sentence"}\n\n'
+        "Rules:\n"
+        "- Only recommend a pre-filter when the intent references a specific structural section "
+        "(e.g. 'footer', 'sidebar', 'nav', 'header', 'main', 'article') OR the page clearly "
+        "has high-noise sections unrelated to the intent\n"
+        "- Use ONLY semantic element selectors: footer, nav, header, main, article, aside, "
+        "or attribute-based like [id*='price'], [class*='sidebar'] — NEVER positional selectors "
+        "like div:nth-child(3) or //*[2]\n"
+        "- Default to needs_prefilter=false — most intents don't need one\n"
+        "- selector must be null when needs_prefilter=false"
+    )

changedetectionio/llm/response_parser.py

@@ -0,0 +1,84 @@
+"""
+Parse and validate LLM JSON responses.
+Pure functions — no side effects, fully testable.
+
+LLMs occasionally return JSON wrapped in markdown fences or with trailing
+text. This module handles those cases gracefully.
+"""
+
+import json
+import re
+
+# Positional selectors are fragile — reject them even if the LLM generates them
+_POSITIONAL_SELECTOR_RE = re.compile(
+    r'nth-child|nth-of-type|:eq\(|\[\d+\]|\/\/\*\[\d',
+    re.IGNORECASE
+)
+
+
+def _extract_json(raw: str) -> str:
+    """Strip markdown fences and extract the first JSON object."""
+    raw = raw.strip()
+    # Remove ```json ... ``` or ``` ... ``` fences
+    raw = re.sub(r'^```(?:json)?\s*', '', raw, flags=re.MULTILINE)
+    raw = re.sub(r'\s*```$', '', raw, flags=re.MULTILINE)
+    # Find the first { ... } block
+    match = re.search(r'\{.*\}', raw, re.DOTALL)
+    return match.group(0) if match else raw
+
+
+def parse_eval_response(raw: str) -> dict:
+    """
+    Parse a diff evaluation response.
+    Returns {'important': bool, 'summary': str}.
+    Falls back to important=False on any parse error.
+    """
+    try:
+        data = json.loads(_extract_json(raw))
+        return {
+            'important': bool(data.get('important', False)),
+            'summary': str(data.get('summary', '')).strip(),
+        }
+    except (json.JSONDecodeError, AttributeError):
+        return {'important': False, 'summary': ''}
+
+
+def parse_preview_response(raw: str) -> dict:
+    """
+    Parse a live-preview extraction response.
+    Returns {'found': bool, 'answer': str}.
+    Falls back to found=False on any parse error.
+    """
+    try:
+        data = json.loads(_extract_json(raw))
+        return {
+            'found': bool(data.get('found', False)),
+            'answer': str(data.get('answer', '')).strip(),
+        }
+    except (json.JSONDecodeError, AttributeError):
+        return {'found': False, 'answer': ''}
+
+
+def parse_setup_response(raw: str) -> dict:
+    """
+    Parse a setup/pre-filter decision response.
+    Returns {'needs_prefilter': bool, 'selector': str|None, 'reason': str}.
+    Rejects positional selectors even if the LLM generates them.
+    """
+    try:
+        data = json.loads(_extract_json(raw))
+        needs = bool(data.get('needs_prefilter', False))
+        selector = data.get('selector') or None
+
+        # Sanitise: reject positional selectors
+        if selector and _POSITIONAL_SELECTOR_RE.search(selector):
+            selector = None
+            needs = False
+
+        return {
+            'needs_prefilter': needs,
+            'selector': selector if needs else None,
+            'reason': str(data.get('reason', '')).strip(),
+        }
+    except (json.JSONDecodeError, AttributeError):
+        return {'needs_prefilter': False, 'selector': None, 'reason': ''}

changedetectionio/llm/ui_strings.py

@@ -0,0 +1,18 @@
+"""
+Shared UI placeholder strings for LLM fields.
+
+Used by WTForms field definitions in forms.py and blueprint/tags/form.py.
+Templates use their own _()-translated variants but should stay in sync with these.
+"""
+
+# llm_intent field — placeholder text for per-watch context
+LLM_INTENT_WATCH_PLACEHOLDER = (
+    "e.g. Alert me when the price drops below $300, or a new product is launched. "
+    "Ignore footer and navigation changes."
+)
+
+# llm_intent field — placeholder text for tag/group context
+LLM_INTENT_TAG_PLACEHOLDER = (
+    "e.g. Flag price changes or new product launches across all watches in this group"
+)
+

changedetectionio/model/App.py

@@ -2,6 +2,7 @@ from os import getenv
 from copy import deepcopy
 
 from changedetectionio.blueprint.rss import RSS_FORMAT_TYPES, RSS_CONTENT_FORMAT_DEFAULT
+from changedetectionio.llm.evaluator import LLM_DEFAULT_MAX_SUMMARY_TOKENS, LLM_DEFAULT_THINKING_BUDGET
 from changedetectionio.model.Tags import TagsDict
 
 from changedetectionio.notification import (
@@ -70,6 +71,8 @@ class model(dict):
                     'shared_diff_access': False,
                     'strip_ignored_lines': False,
                     'tags': None,  # Initialized in __init__ with real datastore_path
+                    'llm_thinking_budget': LLM_DEFAULT_THINKING_BUDGET,
+                    'llm_max_summary_tokens': LLM_DEFAULT_MAX_SUMMARY_TOKENS,
                     'webdriver_delay': None , # Extra delay in seconds before extracting text
                     'ui': {
                         'use_page_title_in_list': True,

changedetectionio/model/Tag.py

@@ -46,11 +46,26 @@ class model(EntityPersistenceMixin, watch_base):
         super(model, self).__init__(*arg, **kw)
 
         self['overrides_watch'] = kw.get('default', {}).get('overrides_watch')
+        self['url_match_pattern'] = kw.get('default', {}).get('url_match_pattern', '')
 
         if kw.get('default'):
             self.update(kw['default'])
             del kw['default']
 
+    def matches_url(self, url: str) -> bool:
+        """Return True if this tag should be auto-applied to the given watch URL.
+
+        Wildcard patterns (*,?,[ ) use fnmatch; anything else is a case-insensitive
+        substring match. Returns False if no pattern is configured.
+        """
+        import fnmatch
+        pattern = self.get('url_match_pattern', '').strip()
+        if not pattern or not url:
+            return False
+        if any(c in pattern for c in ('*', '?', '[')):
+            return fnmatch.fnmatch(url.lower(), pattern.lower())
+        return pattern.lower() in url.lower()
+
     # _save_to_disk() method provided by EntityPersistenceMixin
     # commit() and _get_commit_data() methods inherited from watch_base
     # Tag uses default _get_commit_data() (includes all keys)

changedetectionio/model/Watch.py

@@ -465,22 +465,21 @@ class model(EntityPersistenceMixin, watch_base):
                     if ',' in i:
                         k, v = i.strip().split(',', 2)
 
-                        # The index history could contain a relative path, so we need to make the fullpath
-                        # so that python can read it
-                        # Cross-platform: check for any path separator (works on Windows and Unix)
-                        if os.sep not in v and '/' not in v and '\\' not in v:
-                            # Relative filename only, no path separators
-                            v = os.path.join(self.data_dir, v)
-                        else:
-                            # It's possible that they moved the datadir on older versions
-                            # So the snapshot exists but is in a different path
-                            # Cross-platform: use os.path.basename instead of split('/')
-                            snapshot_fname = os.path.basename(v)
-                            proposed_new_path = os.path.join(self.data_dir, snapshot_fname)
-                            if not os.path.exists(v) and os.path.exists(proposed_new_path):
-                                v = proposed_new_path
+                        # Always resolve history entries to within the watch's own data directory.
+                        # Entries restored from backup could contain absolute or traversal paths —
+                        # never trust them. Use realpath to also block symlink-based escapes.
+                        safe_data_dir = os.path.realpath(self.data_dir)
+                        snapshot_fname = os.path.basename(v.strip())
+                        resolved_path = os.path.realpath(os.path.join(self.data_dir, snapshot_fname))
 
-                        tmp_history[k] = v
+                        if not resolved_path.startswith(safe_data_dir + os.sep) and resolved_path != safe_data_dir:
+                            logger.warning(f"Skipping unsafe history entry for {self.get('uuid')}: {v!r}")
+                            continue
+
+                        if not os.path.exists(resolved_path):
+                            continue
+
+                        tmp_history[k] = resolved_path
 
         if len(tmp_history):
             self.__newest_history_key = list(tmp_history.keys())[-1]
@@ -563,6 +562,15 @@ class model(EntityPersistenceMixin, watch_base):
         if not filepath:
             filepath = self.history[timestamp]
 
+        # Confine every read to the watch's own data directory — defence in depth
+        # against any path that bypasses the history parser (e.g. direct filepath= callers).
+        # Set HISTORY_SNAPSHOT_FILE_ALLOW_OUTSIDE_WATCH_DATADIR=true to disable (not recommended).
+        if self.data_dir and not strtobool(os.getenv('HISTORY_SNAPSHOT_FILE_ALLOW_OUTSIDE_WATCH_DATADIR', 'False')):
+            safe_data_dir = os.path.realpath(self.data_dir)
+            resolved = os.path.realpath(filepath)
+            if not (resolved.startswith(safe_data_dir + os.sep) or resolved == safe_data_dir):
+                raise PermissionError(f"Snapshot path {filepath!r} is outside the watch data directory")
+
         # Check if binary file (image, PDF, etc.)
         # Binary files are NEVER saved with .br compression, only text files are
         binary_extensions = ('.png', '.jpg', '.jpeg', '.gif', '.webp', '.pdf', '.bin', '.jfif')
@@ -798,24 +806,50 @@ class model(EntityPersistenceMixin, watch_base):
         # Also in the case that the file didnt exist
         return True
 
-    def bump_favicon(self, url, favicon_base_64: str) -> None:
+    def bump_favicon(self, url, favicon_base_64: str, mime_type: str = None) -> None:
         from urllib.parse import urlparse
         import base64
         import binascii
-        decoded = None
+        import re
 
-        if url:
+        MAX_FAVICON_BYTES = 1 * 1024 * 1024  # 1 MB
+
+        MIME_TO_EXT = {
+            'image/png': 'png',
+            'image/x-icon': 'ico',
+            'image/vnd.microsoft.icon': 'ico',
+            'image/jpeg': 'jpg',
+            'image/gif': 'gif',
+            'image/svg+xml': 'svg',
+            'image/webp': 'webp',
+            'image/bmp': 'bmp',
+        }
+
+        extension = None
+
+        # If the caller already resolved the MIME type (e.g. from blob.type or a data URI),
+        # use that directly — it's more reliable than guessing from a URL path.
+        if mime_type:
+            extension = MIME_TO_EXT.get(mime_type.lower().split(';')[0].strip(), None)
+
+        # Fall back to extracting extension from URL path, unless it's a data URI.
+        if not extension and url and not url.startswith('data:'):
             try:
                 parsed = urlparse(url)
                 filename = os.path.basename(parsed.path)
-                (base, extension) = filename.lower().strip().rsplit('.', 1)
+                (_base, ext) = filename.lower().strip().rsplit('.', 1)
+                extension = ext
             except ValueError:
-                logger.error(f"UUID: {self.get('uuid')} Cant work out file extension from '{url}'")
-                return None
-        else:
-            # Assume favicon.ico
-            base = "favicon"
-            extension = "ico"
+                logger.warning(f"UUID: {self.get('uuid')} Cant work out file extension from '{url}', defaulting to ico")
+
+        # Handle data URIs: extract MIME type from the URI itself when not already known
+        if not extension and url and url.startswith('data:'):
+            m = re.match(r'^data:([^;]+);base64,', url)
+            if m:
+                extension = MIME_TO_EXT.get(m.group(1).lower(), None)
+
+        if not extension:
+            extension = 'ico'
 
         fname = os.path.join(self.data_dir, f"favicon.{extension}")
 
@@ -824,22 +858,27 @@ class model(EntityPersistenceMixin, watch_base):
             decoded = base64.b64decode(favicon_base_64, validate=True)
         except (binascii.Error, ValueError) as e:
             logger.warning(f"UUID: {self.get('uuid')} FavIcon save data (Base64) corrupt? {str(e)}")
-        else:
-            if decoded:
-                try:
-                    with open(fname, 'wb') as f:
-                        f.write(decoded)
+            return None
 
-                    # Invalidate module-level favicon filename cache for this watch
-                    _FAVICON_FILENAME_CACHE.pop(self.data_dir, None)
+        if len(decoded) > MAX_FAVICON_BYTES:
+            logger.warning(f"UUID: {self.get('uuid')} Favicon too large ({len(decoded)} bytes), skipping")
+            return None
 
-                    # A signal that could trigger the socket server to update the browser also
-                    watch_check_update = signal('watch_favicon_bump')
-                    if watch_check_update:
-                        watch_check_update.send(watch_uuid=self.get('uuid'))
+        try:
+            with open(fname, 'wb') as f:
+                f.write(decoded)
 
-                except Exception as e:
-                    logger.warning(f"UUID: {self.get('uuid')} error saving FavIcon to {fname} - {str(e)}")
+            # Invalidate module-level favicon filename cache for this watch
+            _FAVICON_FILENAME_CACHE.pop(self.data_dir, None)
+
+            # A signal that could trigger the socket server to update the browser also
+            watch_check_update = signal('watch_favicon_bump')
+            if watch_check_update:
+                watch_check_update.send(watch_uuid=self.get('uuid'))
+
+        except Exception as e:
+            logger.warning(f"UUID: {self.get('uuid')} error saving FavIcon to {fname} - {str(e)}")
+            return None
 
         # @todo - Store some checksum and only write when its different
         logger.debug(f"UUID: {self.get('uuid')} updated favicon to at {fname}")
@@ -970,6 +1009,38 @@ class model(EntityPersistenceMixin, watch_base):
         return False
 
 
+    @staticmethod
+    def _llm_summary_prompt_hash(prompt: str) -> str:
+        """8-char hex hash of the prompt — used to detect when the prompt changes."""
+        import hashlib
+        return hashlib.md5(prompt.encode('utf-8', errors='replace')).hexdigest()[:8]
+
+    def get_llm_diff_summary(self, from_version, to_version, prompt: str = '') -> str:
+        """Return the cached AI Change Summary for this from→to + prompt combination, or ''.
+
+        The prompt hash is embedded in the filename so that a changed prompt
+        automatically produces a cache miss and triggers regeneration.
+        """
+        prompt_hash = self._llm_summary_prompt_hash(prompt)
+        fname = os.path.join(self.data_dir, f'change-summary-{from_version}-to-{to_version}-{prompt_hash}.txt')
+        if not os.path.isfile(fname):
+            return ''
+        with open(fname, 'r', encoding='utf-8') as f:
+            return f.read().strip()
+
+    def save_llm_diff_summary(self, summary: str, from_version, to_version, prompt: str = ''):
+        """Persist the AI Change Summary keyed by version pair + prompt hash."""
+        self.ensure_data_dir_exists()
+        prompt_hash = self._llm_summary_prompt_hash(prompt)
+        fname = os.path.join(self.data_dir, f'change-summary-{from_version}-to-{to_version}-{prompt_hash}.txt')
+        tmp = fname + '.tmp'
+        try:
+            with open(tmp, 'w', encoding='utf-8') as f:
+                f.write(summary)
+            os.replace(tmp, fname)
+        except OSError as e:
+            logger.warning(f"Could not write LLM summary cache {fname}: {e}")
+
     def pause(self):
         self['paused'] = True
 

changedetectionio/model/__init__.py

@@ -186,7 +186,13 @@ class watch_base(dict):
             'consecutive_filter_failures': 0,  # Every time the CSS/xPath filter cannot be located, reset when all is fine.
             'content-type': None,
             'date_created': None,
+            'extract_lines_containing': [],  # Keep only lines containing these substrings (plain text, case-insensitive)
             'extract_text': [],  # Extract text by regex after filters
+            # LLM intent-based evaluation
+            'llm_intent': '',                # Plain-English description of what the user cares about (change filter)
+            'llm_change_summary': '',        # Prompt for AI Change Summary — replaces {{ diff }} in notifications
+            'llm_prefilter': None,           # CSS selector derived at setup time (semantic only, e.g. "footer")
+            'llm_evaluation_cache': {},      # {sha256(intent+diff): {important, summary}} - evaluated once, cached
             'fetch_backend': 'system',  # plaintext, playwright etc
             'fetch_time': 0.0,
             'filter_failure_notification_send': strtobool(os.getenv('FILTER_FAILURE_NOTIFICATION_SEND_DEFAULT', 'True')),
@@ -337,8 +343,17 @@ class watch_base(dict):
         # These are set by processors/workers and should not trigger edited flag
         additional_system_fields = {
             'last_check_status',  # Set by processors
+            'last_filter_config_hash',  # Set by text_json_diff processor, internal skip-cache
             'restock',  # Set by restock processor
             'last_viewed',  # Set by mark_all_viewed endpoint
+            # LLM runtime fields written back by worker/evaluator
+            '_llm_result',
+            '_llm_intent',
+            '_llm_change_summary',
+            'llm_prefilter',
+            'llm_evaluation_cache',
+            'llm_last_tokens_used',
+            'llm_tokens_used_cumulative',
         }
 
         # Only mark as edited if this is a user-writable field

changedetectionio/notification/apprise_plugin/custom_handlers.py

@@ -48,8 +48,9 @@ To verify this works:
 """
 
 import json
+import os
 import re
-from urllib.parse import unquote_plus
+from urllib.parse import unquote_plus, urlparse
 
 import requests
 from apprise import plugins
@@ -59,6 +60,8 @@ from apprise.utils.logic import dict_full_update
 from loguru import logger
 from requests.structures import CaseInsensitiveDict
 
+from changedetectionio.validate_url import is_private_hostname
+
 SUPPORTED_HTTP_METHODS = {"get", "post", "put", "delete", "patch", "head"}
 
 
@@ -195,6 +198,15 @@ def apprise_http_custom_handler(
 
     url = re.sub(rf"^{schema}", "https" if schema.endswith("s") else "http", parsed_url.get("url"))
 
+    # SSRF protection — block private/loopback addresses unless explicitly allowed
+    if not os.getenv('ALLOW_IANA_RESTRICTED_ADDRESSES', '').lower() in ('true', '1', 'yes'):
+        hostname = urlparse(url).hostname or ''
+        if hostname and is_private_hostname(hostname):
+            raise ValueError(
+                f"Notification target '{hostname}' is a private/reserved address. "
+                f"Set ALLOW_IANA_RESTRICTED_ADDRESSES=true to allow."
+            )
+
     response = requests.request(
         method=method,
         url=url,

changedetectionio/notification/handler.py

@@ -259,9 +259,12 @@ def apply_service_tweaks(url, n_body, n_title, requested_output_format):
     elif (url.startswith('discord://') or url.startswith('https://discordapp.com/api/webhooks')
           or url.startswith('https://discord.com/api'))\
             and 'html' in requested_output_format:
-        # Discord doesn't support HTML, replace <br> with newlines
+        # Discord doesn't render HTML — convert markup to plain text equivalents.
+        # &nbsp; is injected upstream to preserve double-spaces for HTML email clients;
+        # Discord displays it as the literal string "&nbsp;" so strip it here.
         n_body = n_body.strip().replace('<br>', '\n')
         n_body = n_body.replace('</br>', '\n')
+        n_body = n_body.replace('&nbsp;', ' ')
         n_body = newline_re.sub('\n', n_body)
 
         # Don't replace placeholders or truncate here - let the custom Discord plugin handle it
@@ -361,6 +364,21 @@ def process_notification(n_object: NotificationContextData, datastore):
         )
     )
 
+    # {{ raw_diff }} always holds the actual diff regardless of AI Change Summary
+    n_object['raw_diff'] = n_object.get('diff', '')
+
+    # AI Change Summary: optionally replace {{ diff }} with the AI summary
+    _llm_change_summary = (n_object.get('_llm_change_summary') or '').strip()
+    _override_diff = datastore.data['settings']['application'].get('llm_override_diff_with_summary', True)
+    if _llm_change_summary and _override_diff:
+        n_object['diff'] = _llm_change_summary
+
+    # Lazily populate llm_summary / llm_intent if used in notification template
+    scan_text = n_object.get('notification_body', '') + n_object.get('notification_title', '')
+    if 'llm_summary' in scan_text or 'llm_intent' in scan_text or 'raw_diff' in scan_text:
+        n_object['llm_summary'] = _llm_change_summary or (n_object.get('_llm_result') or {}).get('summary', '')
+        n_object['llm_intent'] = n_object.get('_llm_intent', '')
+
     with (apprise.LogCapture(level=apprise.logging.DEBUG) as logs):
         for url in n_object['notification_urls']:
 

changedetectionio/notification_service.py

@@ -88,6 +88,29 @@ class FormattableTimestamp(str):
             return self._dt.isoformat()
 
 
+class FormattableExtract(str):
+    """
+    A str subclass that holds only the extracted changed fragments from a diff.
+    Used for {{diff_changed_from}} and {{diff_changed_to}} tokens.
+
+        {{ diff_changed_from }}   → old value(s) only, e.g. "$99.99"
+        {{ diff_changed_to }}     → new value(s) only, e.g. "$109.99"
+
+    Multiple changed fragments are joined with newlines.
+    Being a str subclass means it is natively JSON serializable.
+    """
+    def __new__(cls, prev_snapshot, current_snapshot, extract_fn):
+        if prev_snapshot or current_snapshot:
+            from changedetectionio import diff as diff_module
+            # word_diff=True is required — placemarker extraction regexes only exist in word-diff output
+            raw = diff_module.render_diff(prev_snapshot or '', current_snapshot or '', word_diff=True)
+            extracted = extract_fn(raw)
+        else:
+            extracted = ''
+        instance = super().__new__(cls, extracted)
+        return instance
+
+
 class FormattableDiff(str):
     """
     A str subclass representing a rendered diff. As a plain string it renders
@@ -161,6 +184,8 @@ class NotificationContextData(dict):
             'diff_patch': FormattableDiff('', '', patch_format=True),
             'diff_removed': FormattableDiff('', '', include_added=False),
             'diff_removed_clean': FormattableDiff('', '', include_added=False, include_change_type_prefix=False),
+            'diff_changed_from': FormattableExtract('', '', extract_fn=lambda x: x),
+            'diff_changed_to': FormattableExtract('', '', extract_fn=lambda x: x),
             'diff_url': None,
             'markup_text_links_to_html_links': False, # If automatic conversion of plaintext to HTML should happen
             'notification_timestamp': time.time(),
@@ -170,6 +195,8 @@ class NotificationContextData(dict):
             'timestamp_from': None,
             'timestamp_to': None,
             'triggered_text': None,
+            'llm_summary': None,     # AI plain-English summary of what changed (requires AI intent to be configured)
+            'llm_intent': None,      # The intent that was evaluated (watch-level or inherited from tag)
             'uuid': 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX',  # Converted to 'watch_uuid' in create_notification_parameters
             'watch_mime_type': None,
             'watch_tag': None,
@@ -244,16 +271,27 @@ def add_rendered_diff_to_notification_vars(notification_scan_text:str, prev_snap
         'diff_removed_clean': {'word_diff': word_diff, 'include_added': False, 'include_change_type_prefix': False},
     }
 
+    from changedetectionio.diff import extract_changed_from, extract_changed_to
+    extract_specs = {
+        'diff_changed_from': extract_changed_from,
+        'diff_changed_to':   extract_changed_to,
+    }
+
     ret = {}
     rendered_count = 0
-    # Only create FormattableDiff objects for diff keys actually used in the notification text
+    # Only create FormattableDiff/FormattableExtract objects for diff keys actually used in the notification text
     for key in NotificationContextData().keys():
-        if key.startswith('diff') and key in diff_specs:
-            # Check if this placeholder is actually used in the notification text
-            pattern = rf"(?<![A-Za-z0-9_]){re.escape(key)}(?![A-Za-z0-9_])"
-            if re.search(pattern, notification_scan_text, re.IGNORECASE):
-                ret[key] = FormattableDiff(prev_snapshot, current_snapshot, **diff_specs[key])
-                rendered_count += 1
+        if not key.startswith('diff'):
+            continue
+        pattern = rf"(?<![A-Za-z0-9_]){re.escape(key)}(?![A-Za-z0-9_])"
+        if not re.search(pattern, notification_scan_text, re.IGNORECASE):
+            continue
+        if key in diff_specs:
+            ret[key] = FormattableDiff(prev_snapshot, current_snapshot, **diff_specs[key])
+            rendered_count += 1
+        elif key in extract_specs:
+            ret[key] = FormattableExtract(prev_snapshot, current_snapshot, extract_fn=extract_specs[key])
+            rendered_count += 1
 
     if rendered_count:
         logger.trace(f"Rendered {rendered_count} diff placeholder(s) {sorted(ret.keys())} in {time.time() - now:.3f}s")
@@ -375,6 +413,11 @@ class NotificationService:
         n_object['notification_body'] = _check_cascading_vars(self.datastore,'notification_body', watch)
         n_object['notification_format'] = _check_cascading_vars(self.datastore,'notification_format', watch)
 
+        # Attach LLM results so notification tokens render correctly
+        n_object['_llm_result'] = watch.get('_llm_result')
+        n_object['_llm_intent'] = watch.get('_llm_intent', '')
+        n_object['_llm_change_summary'] = watch.get('_llm_change_summary', '')
+
         # (Individual watch) Only prepare to notify if the rules above matched
         queued = False
         if n_object and n_object.get('notification_urls'):
@@ -461,7 +504,7 @@ Thanks - Your omniscient changedetection.io installation.
         n_object = NotificationContextData({
             'notification_title': f"Changedetection.io - Alert - Browser step at position {step} could not be run",
             'notification_body': body,
-            'notification_format': self._check_cascading_vars('notification_format', watch),
+            'notification_format': _check_cascading_vars(self.datastore, 'notification_format', watch),
         })
         n_object['markup_text_links_to_html_links'] = n_object.get('notification_format').startswith('html')
 

changedetectionio/pluggy_interface.py

@@ -61,7 +61,7 @@ class ChangeDetectionSpec:
         pass
 
     @hookspec
-    def get_itemprop_availability_override(self, content, fetcher_name, fetcher_instance, url):
+    def get_itemprop_availability_override(self, content, fetcher_name, fetcher_instance, url, llm_intent=None):
         """Provide custom implementation of get_itemprop_availability for a specific fetcher.
 
         This hook allows plugins to provide their own product availability detection
@@ -73,6 +73,7 @@ class ChangeDetectionSpec:
             fetcher_name: The name of the fetcher being used (e.g., 'html_js_zyte')
             fetcher_instance: The fetcher instance that generated the content
             url: The URL being watched/checked
+            llm_intent: Optional user-supplied intent string (e.g. "alert when price drops below $300")
 
         Returns:
             dict or None: Dictionary with availability data:
@@ -174,6 +175,64 @@ class ChangeDetectionSpec:
         """
         pass
 
+    @hookspec
+    def get_html_head_extras():
+        """Return HTML to inject into the <head> of every page via base.html.
+
+        Plugins can use this to add <script>, <style>, or <link> tags that should
+        be present on all pages.  Return a raw HTML string or None.
+
+        IMPORTANT: Always use Flask's url_for() for any src/href URLs so that
+        sub-path deployments (nginx reverse proxy with USE_X_SETTINGS / X-Forwarded-Prefix)
+        work correctly.  This hook is called inside a request context so url_for() is
+        always available.
+
+        For small amounts of CSS/JS, return them inline — no file-serving needed::
+
+            from changedetectionio.pluggy_interface import hookimpl
+
+            @hookimpl
+            def get_html_head_extras(self):
+                return (
+                    '<style>.my-module-banner { color: red; }</style>\\n'
+                    '<script>console.log("my_module_content loaded");</script>'
+                )
+
+        For larger assets, register your own lightweight Flask routes in the plugin
+        module and point to them with url_for() so the sub-path prefix is handled
+        automatically::
+
+            from flask import url_for, Response
+            from changedetectionio.pluggy_interface import hookimpl
+            from changedetectionio.flask_app import app as _app
+
+            MY_CSS = ".my-module-example { color: red; }"
+            MY_JS  = "console.log('my_module_content loaded');"
+
+            @_app.route('/my_module_content/css')
+            def my_module_content_css():
+                return Response(MY_CSS, mimetype='text/css',
+                                headers={'Cache-Control': 'max-age=3600'})
+
+            @_app.route('/my_module_content/js')
+            def my_module_content_js():
+                return Response(MY_JS, mimetype='application/javascript',
+                                headers={'Cache-Control': 'max-age=3600'})
+
+            @hookimpl
+            def get_html_head_extras(self):
+                css = url_for('my_module_content_css')
+                js  = url_for('my_module_content_js')
+                return (
+                    f'<link rel="stylesheet" href="{css}">\\n'
+                    f'<script src="{js}" defer></script>'
+                )
+
+        Returns:
+            str or None: Raw HTML string to inject inside <head>, or None
+        """
+        pass
+
 
 # Set up Plugin Manager
 plugin_manager = pluggy.PluginManager(PLUGIN_NAMESPACE)
@@ -183,24 +242,27 @@ plugin_manager.add_hookspecs(ChangeDetectionSpec)
 
 # Load plugins from subdirectories
 def load_plugins_from_directories():
-    # Dictionary of directories to scan for plugins
-    plugin_dirs = {
-        'conditions': os.path.join(os.path.dirname(__file__), 'conditions', 'plugins'),
-        # Add more plugin directories here as needed
-    }
-    
-    # Note: Removed the direct import of example_word_count_plugin as it's now in the conditions/plugins directory
-    
-    for dir_name, dir_path in plugin_dirs.items():
+    # List of (python_package_prefix, filesystem_path) pairs to scan for plugins.
+    # NOTE: processors/restock_diff/plugins is intentionally excluded here — those
+    # plugins are registered via register_builtin_restock_plugins() to avoid the
+    # circular import: restock_diff/__init__.py → model.Watch → content_fetchers → pluggy_interface.
+    plugin_dirs = [
+        (
+            'changedetectionio.conditions.plugins',
+            os.path.join(os.path.dirname(__file__), 'conditions', 'plugins'),
+        ),
+    ]
+
+    for module_prefix, dir_path in plugin_dirs:
         if not os.path.exists(dir_path):
             continue
-            
+
         # Get all Python files (excluding __init__.py)
         for filename in os.listdir(dir_path):
             if filename.endswith(".py") and filename != "__init__.py":
                 module_name = filename[:-3]  # Remove .py extension
-                module_path = f"changedetectionio.{dir_name}.plugins.{module_name}"
-                
+                module_path = f"{module_prefix}.{module_name}"
+
                 try:
                     module = importlib.import_module(module_path)
                     # Register the plugin with pluggy
@@ -252,6 +314,24 @@ def register_builtin_fetchers():
     if hasattr(webdriver_selenium, 'webdriver_selenium_plugin'):
         plugin_manager.register(webdriver_selenium.webdriver_selenium_plugin, 'builtin_webdriver_selenium')
 
+
+def register_builtin_restock_plugins():
+    """Register built-in restock processor plugins after all imports are complete.
+
+    Called from content_fetchers/__init__.py alongside register_builtin_fetchers()
+    to avoid the circular import that occurs when loading via load_plugins_from_directories()
+    (restock_diff/__init__.py → model.Watch → content_fetchers → pluggy_interface).
+    """
+    import importlib
+    module_path = 'changedetectionio.processors.restock_diff.plugins.llm_restock'
+    try:
+        module = importlib.import_module(module_path)
+        if not plugin_manager.is_registered(module):
+            plugin_manager.register(module, 'llm_restock')
+            logger.debug("Registered built-in restock plugin: llm_restock")
+    except Exception as e:
+        logger.error(f"Failed to register llm_restock plugin: {e}")
+
 # Helper function to collect UI stats extras from all plugins
 def collect_ui_edit_stats_extras(watch):
     """Collect and combine HTML content from all plugins that implement ui_edit_stats_extras"""
@@ -288,7 +368,7 @@ def collect_fetcher_status_icons(fetcher_name):
 
     return None
 
-def get_itemprop_availability_from_plugin(content, fetcher_name, fetcher_instance, url):
+def get_itemprop_availability_from_plugin(content, fetcher_name, fetcher_instance, url, llm_intent=None):
     """Get itemprop availability data from plugins as a fallback.
 
     This is called when the built-in get_itemprop_availability doesn't find good data.
@@ -298,6 +378,7 @@ def get_itemprop_availability_from_plugin(content, fetcher_name, fetcher_instanc
         fetcher_name: The name of the fetcher being used (e.g., 'html_js_zyte')
         fetcher_instance: The fetcher instance that generated the content
         url: The URL being watched (watch.link - includes Jinja2 evaluation)
+        llm_intent: Optional user-supplied intent string passed through to plugins
 
     Returns:
         dict or None: Availability data dictionary from first matching plugin, or None
@@ -307,7 +388,8 @@ def get_itemprop_availability_from_plugin(content, fetcher_name, fetcher_instanc
         content=content,
         fetcher_name=fetcher_name,
         fetcher_instance=fetcher_instance,
-        url=url
+        url=url,
+        llm_intent=llm_intent,
     )
 
     # Return first non-None result with actual data
@@ -606,4 +688,20 @@ def apply_update_finalize(update_handler, watch, datastore, processing_exception
     except Exception as e:
         # Don't let plugin errors crash the worker
         logger.error(f"Error in update_finalize hook: {e}")
-        logger.exception(f"update_finalize hook exception details:")
+        logger.exception(f"update_finalize hook exception details:")
+
+
+def collect_html_head_extras():
+    """Collect and combine HTML head extras from all plugins.
+
+    Called from a Flask template global so it always runs inside a request context.
+    This means url_for() works correctly in plugin implementations, including when the
+    app is deployed under a sub-path via USE_X_SETTINGS / X-Forwarded-Prefix (ProxyFix
+    sets SCRIPT_NAME so url_for() automatically prepends the prefix).
+
+    Returns:
+        str: Combined HTML string to inject inside <head>, or empty string
+    """
+    results = plugin_manager.hook.get_html_head_extras()
+    parts = [r for r in results if r]
+    return "\n".join(parts) if parts else ""

changedetectionio/processors/__init__.py

@@ -341,6 +341,18 @@ def get_processor_descriptions():
     return descriptions
 
 
+def wcag_text_color(hex_bg: str) -> str:
+    """Return #000000 or #ffffff for maximum WCAG contrast against hex_bg."""
+    hex_bg = hex_bg.lstrip('#')
+    if len(hex_bg) != 6:
+        return '#000000'
+    r, g, b = (int(hex_bg[i:i+2], 16) / 255 for i in (0, 2, 4))
+    def lin(c):
+        return c / 12.92 if c <= 0.04045 else ((c + 0.055) / 1.055) ** 2.4
+    L = 0.2126 * lin(r) + 0.7152 * lin(g) + 0.0722 * lin(b)
+    return '#000000' if L > 0.179 else '#ffffff'
+
+
 def generate_processor_badge_colors(processor_name):
     """
     Generate consistent colors for a processor badge based on its name.

changedetectionio/processors/base.py

@@ -97,7 +97,6 @@ class difference_detection_processor():
             logger.warning(f"Failed to read checksum file for {self.watch_uuid}: {e}")
             self.last_raw_content_checksum = None
 
-
     async def validate_iana_url(self):
         """Pre-flight SSRF check — runs DNS lookup in executor to avoid blocking the event loop.
         Covers all fetchers (requests, playwright, puppeteer, plugins) since every fetch goes

changedetectionio/processors/extract.py

@@ -61,7 +61,7 @@ def render_form(watch, datastore, request, url_for, render_template, flash, redi
         screenshot=screenshot_url,
         is_html_webdriver=is_html_webdriver,
         password_enabled_and_share_is_off=password_enabled_and_share_is_off,
-        extra_title=f" - {watch.label} - Extract Data",
+        extra_title=f" - {watch.label} - {gettext('Extract Data')}",
         extra_stylesheets=[url_for('static_content', group='styles', filename='diff.css')],
         pure_menu_fixed=False
     )

changedetectionio/processors/restock_diff/plugins/llm_restock.py

@@ -0,0 +1,295 @@
+"""
+LLM fallback plugin for price and restock info extraction.
+
+When the built-in structured-metadata extraction (JSON-LD, microdata, OpenGraph)
+fails to produce both a price and availability, this plugin is called as a last
+resort.  It sends a trimmed, HTML-stripped version of the page to the configured
+LLM and asks it to return a structured JSON answer.
+
+The module-level `datastore` variable is injected at startup by
+`inject_datastore_into_plugins()` in pluggy_interface.py.
+"""
+import json
+import re
+from loguru import logger
+from changedetectionio.pluggy_interface import hookimpl
+
+# Injected at startup by inject_datastore_into_plugins()
+datastore = None
+
+SYSTEM_PROMPT = (
+    'You are an expert price and restock extraction utility. '
+    'Your task is to analyse a product page and determine the price and stock status of the MAIN product only.\n\n'
+
+    'AVAILABILITY — treat as "in stock":\n'
+    '- Action buttons near the product: "Add to cart", "Add to basket", "Buy now", '
+    '"Order now", "Purchase", "Import", "Add to bag", "Add to trolley", "In stock", '
+    '"Available", "Ships in X days/weeks", "In store", "Pick up today".\n'
+    '- "Pre-order" or "Reserve" — the item is orderable, treat as "in stock".\n'
+    '- "Only X left", "Almost gone", "Low stock", "Limited availability" — still in stock.\n'
+    '- "Request a quote" or "Contact us for pricing" — item is available, price is null.\n'
+    '- IMPORTANT: Ignore cart/basket/bag links in the page HEADER or navigation bar '
+    '(e.g. a shopping cart icon showing item count). That reflects what is already in '
+    'the visitor\'s cart — it says nothing about whether THIS product is available.\n\n'
+
+    'PRICE — what NOT to use:\n'
+    '- A "$0.00" or "0" that appears near header/nav links such as "Login", "Wishlist", '
+    '"Contact Us", "My Account" is an empty shopping-cart indicator, NOT the product price. '
+    'Ignore it entirely — return null for price rather than 0 in this situation.\n'
+    '- Only return 0 (free) when the page clearly states the product itself costs nothing '
+    '(e.g. "Free", "Free download", "Price: $0").\n\n'
+
+    'AVAILABILITY — treat as "out of stock":\n'
+    '- "Out of stock", "Sold out", "Unavailable", "Currently unavailable", '
+    '"Temporarily out of stock", "Discontinued", "No longer available", '
+    '"Notify me when available", "Email me when back", "Join waitlist".\n\n'
+
+    'AVAILABILITY — return null when uncertain:\n'
+    '- The page asks the user to select a size, colour, or other variant first '
+    '("Select an option", "Choose a size") — availability depends on the variant, so return null.\n'
+    '- You cannot clearly tell from the page content whether the item is available.\n\n'
+
+    'PRICE rules:\n'
+    '- Extract the main selling price as a plain number, no currency symbol.\n'
+    '- Prices may use any popular locale format — interpret them all correctly and return a plain decimal number. '
+    'Examples: "10 000 Kč" = 10000, "1.299,95 €" = 1299.95, "1,299.95" = 1299.95, '
+    '"10 000,50" = 10000.50, "£1.299" = 1299, "¥10000" = 10000.\n'
+    '- If both an original (crossed-out) price and a sale/current price appear, use the sale price.\n'
+    '- "From $X" or "Starting at $X" are teaser prices — prefer a definite price or return null.\n'
+    '- A price of 0 (free) is valid — return 0, not null.\n'
+    '- If pricing requires a quote or login, return null for price.\n'
+    '- Ignore prices shown in search/filter UI elements (e.g. "Price from: — to:").\n'
+    '- IMPORTANT: Ignore ALL prices that appear inside or below recommendation/discovery blocks '
+    'such as: "Similar items", "You may also like", "Customers also bought", '
+    '"Based on your browsing", "Based on your shopping", "Frequently bought together", '
+    '"People also viewed", "Related products", "Sponsored products", "More like this", '
+    '"Other sellers", "Compare with similar items". '
+    'These sections contain prices for OTHER products, not the main product.\n'
+    '- When multiple prices appear on the page, prefer the price that is positioned '
+    'earliest/highest in the page content — it is almost always the main product price. '
+    'Prices appearing after large blocks of descriptive text or review sections are '
+    'likely from recommendation widgets and should be ignored.\n\n'
+
+    'CLASSIFIEDS AND LISTING PAGES:\n'
+    '- On classifieds or marketplace sites (e.g. eBay listings, Craigslist, Bazoš, Gumtree), '
+    'if a price is shown alongside seller contact details or a "Contact seller" link, '
+    'treat the item as "instock" — the listing being active means it is available.\n\n'
+
+    'Return ONLY a JSON object with exactly these three keys:\n'
+    '  "price"        — number or null\n'
+    '  "currency"     — ISO-4217 code (USD, EUR, GBP …) or null\n'
+    '  "availability" — exactly one of: "instock", "outofstock", or null\n'
+    '                   Use "instock" when the product can be ordered/purchased.\n'
+    '                   Use "outofstock" when it cannot.\n'
+    '                   Use null when you genuinely cannot tell.\n'
+    'No markdown, no backticks, no explanation — pure JSON only.'
+)
+
+_MAX_CONTENT_CHARS = 8_000
+
+
+def _extract_jsonld(html_content: str) -> str:
+    """Extract JSON-LD blocks — these contain reliable structured product data."""
+    blocks = re.findall(
+        r'<script[^>]+type=["\']application/ld\+json["\'][^>]*>(.*?)</script>',
+        html_content, flags=re.DOTALL | re.IGNORECASE
+    )
+    if not blocks:
+        return ''
+    combined = ' '.join(b.strip() for b in blocks)
+    return combined[:2000]
+
+
+# Semantic tags always treated as chrome (nav/header/footer)
+_CHROME_TAGS = {'nav', 'header', 'footer', 'aside'}
+
+# id/class fragments that strongly indicate navigation or site-chrome
+_CHROME_PATTERNS = re.compile(
+    r'\b(nav|navigation|navbar|menu|mega-menu|breadcrumb|breadcrumbs?|'
+    r'site-header|page-header|top-bar|top-nav|top-header|mobile-nav|header-bar|'
+    r'site-footer|page-footer|footer-links|related|similar|'
+    r'you-?may-?also|customers?-?also|frequently-?bought|'
+    r'people-?also|sponsored|recommendation|widget|sidebar|'
+    r'cross-?sell|up-?sell)\b',
+    re.IGNORECASE,
+)
+
+
+def _remove_chrome(html_content: str) -> str:
+    """Use BS4 to strip navigation, header, footer and recommendation noise.
+
+    Uses html.parser (built-in, no lxml) to avoid memory leak issues.
+    Falls back to the original HTML string if BS4 fails for any reason.
+    """
+    try:
+        from bs4 import BeautifulSoup, Tag
+        soup = BeautifulSoup(html_content, 'html.parser')
+
+        # Snapshot the full tag list before any decompositions so we don't
+        # mutate the tree while iterating it.  After a parent is decomposed
+        # its children become orphans (parent=None) — skip those.
+        for tag in list(soup.find_all(True)):
+            if not isinstance(tag, Tag) or tag.parent is None:
+                continue
+            name = tag.name or ''
+            if name in _CHROME_TAGS:
+                tag.decompose()
+                continue
+            try:
+                cls_list = tag.get('class') or []
+                cls_str = ' '.join(cls_list) if isinstance(cls_list, list) else str(cls_list)
+                id_str = tag.get('id') or ''
+            except Exception:
+                continue
+            if _CHROME_PATTERNS.search(cls_str + ' ' + id_str):
+                tag.decompose()
+
+        return str(soup)
+    except Exception as e:
+        logger.debug(f"BS4 chrome removal failed ({e}), using raw HTML")
+        return html_content
+
+
+def _strip_html(html_content: str) -> str:
+    """HTML-to-text for LLM consumption.
+
+    1. Extracts JSON-LD (structured product data) to prepend.
+    2. Strips nav/header/footer/recommendation blocks via BS4.
+    3. Removes all remaining tags and collapses whitespace.
+    JSON-LD is prepended so reliable price/availability data is always visible
+    to the LLM regardless of how deep it sits in the page.
+    """
+    jsonld = _extract_jsonld(html_content)
+
+    # Remove site-chrome before generic tag stripping
+    cleaned = _remove_chrome(html_content)
+
+    # Drop HTML comments (can contain large disabled markup blocks)
+    text = re.sub(r'<!--.*?-->', ' ', cleaned, flags=re.DOTALL)
+    # Drop all <script> and <style> blocks
+    text = re.sub(r'<(script|style)[^>]*>.*?</(script|style)>', ' ', text, flags=re.DOTALL | re.IGNORECASE)
+    # Strip remaining tags
+    text = re.sub(r'<[^>]+>', ' ', text)
+    # Decode common entities
+    text = (text
+            .replace('&nbsp;', ' ')
+            .replace('&amp;', '&')
+            .replace('&lt;', '<')
+            .replace('&gt;', '>')
+            .replace('&quot;', '"')
+            .replace('&#39;', "'"))
+    text = re.sub(r'\s+', ' ', text).strip()
+
+    if jsonld:
+        budget = _MAX_CONTENT_CHARS - len(jsonld) - 1
+        return (jsonld + ' ' + text[:budget]).strip()
+    return text[:_MAX_CONTENT_CHARS]
+
+
+@hookimpl
+def get_itemprop_availability_override(content, fetcher_name, fetcher_instance, url, llm_intent=None):
+    """Use an LLM as a last-resort fallback for price and restock extraction."""
+    global datastore
+
+    if datastore is None:
+        logger.debug("LLM restock fallback: no datastore injected yet, skipping")
+        return None
+
+    # Gate on the user setting (default True — enabled out of the box)
+    app_settings = datastore.data.get('settings', {}).get('application', {})
+    if not app_settings.get('llm_restock_use_fallback_extract', True):
+        logger.debug("LLM restock fallback: disabled in settings")
+        return None
+
+    try:
+        from changedetectionio.llm.evaluator import get_llm_config, accumulate_global_tokens
+        from changedetectionio.llm import client as llm_client
+    except ImportError as e:
+        logger.debug(f"LLM restock fallback: LLM libraries not available ({e})")
+        return None
+
+    llm_cfg = get_llm_config(datastore)
+    if not llm_cfg or not llm_cfg.get('model'):
+        logger.debug("LLM restock fallback: no LLM model configured, skipping")
+        return None
+
+    text_content = _strip_html(content) if content else ''
+    logger.debug(f"LLM restock fallback: stripped HTML to {len(text_content)} chars for {url}")
+    if not text_content.strip():
+        logger.debug("LLM restock fallback: no text content after stripping HTML")
+        return None
+
+    logger.info(f"LLM restock fallback: using LLM ({llm_cfg['model']}) for price/stock extraction - {url}")
+
+    user_prompt = f'URL: {url or "unknown"}\n\nPage content:\n{text_content}'
+    if llm_intent:
+        user_prompt += f'\n\nUser notification intent: {llm_intent}'
+
+    try:
+        raw, tokens, input_tokens, output_tokens = llm_client.completion(
+            model=llm_cfg['model'],
+            messages=[
+                {'role': 'system', 'content': SYSTEM_PROMPT},
+                {'role': 'user', 'content': user_prompt},
+            ],
+            api_key=llm_cfg.get('api_key'),
+            api_base=llm_cfg.get('api_base'),
+            max_tokens=80,
+        )
+
+        accumulate_global_tokens(
+            datastore, tokens,
+            input_tokens=input_tokens,
+            output_tokens=output_tokens,
+            model=llm_cfg['model'],
+        )
+
+        # Strip optional markdown fences the model might add
+        raw = raw.strip()
+        if raw.startswith('```'):
+            raw = re.sub(r'^```[a-z]*\n?', '', raw)
+            raw = raw.rstrip('`').strip()
+
+        logger.debug(f"LLM restock fallback raw response: {raw!r}")
+
+        result = json.loads(raw)
+
+        price = result.get('price')
+        currency = result.get('currency') or None
+        availability = result.get('availability') or None
+
+        # Normalise price to float
+        if price is not None:
+            try:
+                if isinstance(price, str):
+                    price = float(re.sub(r'[^\d.]', '', price))
+                else:
+                    price = float(price)
+            except (ValueError, TypeError):
+                logger.warning(f"LLM restock fallback: could not convert price {price!r} to float, ignoring")
+                price = None
+
+        if price is None and not availability:
+            logger.info(f"LLM restock fallback: LLM returned no usable price or availability for {url} (raw: {raw!r})")
+            return None
+
+        logger.info(
+            f"LLM restock fallback result: price={price} currency={currency} "
+            f"availability={availability!r} url={url}"
+        )
+        return {
+            'price': price,
+            'currency': currency,
+            'availability': availability,
+            '_tokens': tokens,
+            '_input_tokens': input_tokens,
+            '_output_tokens': output_tokens,
+            '_model': llm_cfg['model'],
+        }
+
+    except json.JSONDecodeError as e:
+        logger.warning(f"LLM restock fallback: JSON parse failed ({e}) - raw response was: {raw!r}")
+        return None
+    except Exception as e:
+        logger.warning(f"LLM restock fallback: extraction failed for {url}: {e}")
+        return None

changedetectionio/processors/restock_diff/processor.py

@@ -486,8 +486,7 @@ class perform_site_check(difference_detection_processor):
         has_price = itemprop_availability.get('price') is not None
         has_availability = itemprop_availability.get('availability') is not None
 
-        # @TODO !!! some setting like "Use as fallback" or "always use", "t
-        if not (has_price and has_availability) or True:
+        if not (has_price and has_availability):
             from changedetectionio.pluggy_interface import get_itemprop_availability_from_plugin
             fetcher_name = watch.get('fetch_backend', 'html_requests')
 
@@ -506,9 +505,23 @@ class perform_site_check(difference_detection_processor):
             # Try plugin override - plugins can decide if they support this fetcher
             if fetcher_name:
                 logger.debug(f"Calling extra plugins for getting item price/availability (fetcher: {fetcher_name})")
-                plugin_availability = get_itemprop_availability_from_plugin(self.fetcher.content, fetcher_name, self.fetcher, watch.link)
+                from changedetectionio.llm.evaluator import resolve_intent
+                _llm_intent, _ = resolve_intent(watch, self.datastore)
+                plugin_availability = get_itemprop_availability_from_plugin(self.fetcher.content, fetcher_name, self.fetcher, watch.link, llm_intent=_llm_intent or None)
 
                 if plugin_availability:
+                    # Extract and strip LLM token metadata before using as Restock data
+                    _plugin_tokens = plugin_availability.pop('_tokens', 0)
+                    _plugin_input_tokens = plugin_availability.pop('_input_tokens', 0)
+                    _plugin_output_tokens = plugin_availability.pop('_output_tokens', 0)
+                    _plugin_model = plugin_availability.pop('_model', '')
+
+                    # Update per-watch token counters directly on the watch (same
+                    # pattern as evaluator.py) so they're committed when update_watch runs
+                    if _plugin_tokens:
+                        watch['llm_last_tokens_used'] = _plugin_tokens
+                        watch['llm_tokens_used_cumulative'] = (watch.get('llm_tokens_used_cumulative') or 0) + _plugin_tokens
+
                     # Plugin provided better data, use it
                     plugin_has_price = plugin_availability.get('price') is not None
                     plugin_has_availability = plugin_availability.get('availability') is not None

changedetectionio/processors/templates/extract.html

@@ -3,11 +3,11 @@
 {% block content %}
     <div class="tabs">
     <ul>
-        {% if last_error_text %}<li class="tab" id="error-text-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#error-text">Error Text</a></li> {% endif %}
-        {% if last_error_screenshot %}<li class="tab" id="error-screenshot-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#error-screenshot">Error Screenshot</a></li> {% endif %}
-        <li class="tab" id=""><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#text">Text</a></li>
-        <li class="tab" id="screenshot-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#screenshot">Screenshot</a></li>
-        <li class="tab active" id="extract-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page_extract_GET', uuid=uuid)}}">Extract Data</a></li>
+        {% if last_error_text %}<li class="tab" id="error-text-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#error-text">{{ _('Error Text') }}</a></li> {% endif %}
+        {% if last_error_screenshot %}<li class="tab" id="error-screenshot-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#error-screenshot">{{ _('Error Screenshot') }}</a></li> {% endif %}
+        <li class="tab" id=""><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#text">{{ _('Text') }}</a></li>
+        <li class="tab" id="screenshot-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page', uuid=uuid)}}#screenshot">{{ _('Screenshot') }}</a></li>
+        <li class="tab active" id="extract-tab"><a href="{{ url_for('ui.ui_diff.diff_history_page_extract_GET', uuid=uuid)}}">{{ _('Extract Data') }}</a></li>
     </ul>
 </div>
 
@@ -17,23 +17,23 @@
         <form id="extract-data-form" class="pure-form pure-form-stacked edit-form"  action="{{ url_for('ui.ui_diff.diff_history_page_extract_POST', uuid=uuid) }}"  method="POST">
             <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
 
-            <p>This tool will extract text data from all of the watch history.</p>
+            <p>{{ _('This tool will extract text data from all of the watch history.') }}</p>
 
             <div class="pure-control-group">
                 {{ render_field(extract_form.extract_regex) }}
                 <span class="pure-form-message-inline">
-                    A <strong>RegEx</strong> is a pattern that identifies exactly which part inside of the text that you want to extract.<br>
+                    {{ _('A <strong>RegEx</strong> is a pattern that identifies exactly which part inside of the text that you want to extract.')|safe }}<br>
 
                     <p>
-                        For example, to extract only the numbers from text &dash;<br>
-                        <strong>Raw text</strong>: <code>Temperature <span style="color: red">5.5</span>°C in Sydney</code><br>
-                        <strong>RegEx to extract:</strong> <code>Temperature <span style="color: red">([0-9\.]+)</span></code><br>
+                        {{ _('For example, to extract only the numbers from text') }} &dash;<br>
+                        <strong>{{ _('Raw text') }}</strong>: <code>Temperature <span style="color: red">5.5</span>°C in Sydney</code><br>
+                        <strong>{{ _('RegEx to extract:') }}</strong> <code>Temperature <span style="color: red">([0-9\.]+)</span></code><br>
                     </p>
                     <p>
-                        <a href="https://RegExr.com/">Be sure to test your RegEx here.</a>
+                        <a href="https://RegExr.com/">{{ _('Be sure to test your RegEx here.') }}</a>
                     </p>
                     <p>
-                        Each RegEx group bracket <code>()</code> will be in its own column, the first column value is always the date.
+                        {{ _('Each RegEx group bracket') }} <code>()</code> {{ _('will be in its own column, the first column value is always the date.') }}
                     </p>
                 </span>
             </div>

changedetectionio/processors/text_json_diff/__init__.py

@@ -65,6 +65,12 @@ def prepare_filter_prevew(datastore, watch_uuid, form_data):
         # Only update vars that came in via the AJAX post
         p = {k: v for k, v in form.data.items() if k in form_data.keys()}
         tmp_watch.update(p)
+
+        # Apply llm_intent from form directly — it's not part of processor_text_json_diff_form
+        # but the AJAX sends all visible inputs, so it arrives in form_data
+        if hasattr(form_data, 'get') and 'llm_intent' in form_data:
+            tmp_watch['llm_intent'] = (form_data.get('llm_intent') or '').strip()
+
         blank_watch_no_filters = watch_model(datastore_path=datastore.datastore_path, __datastore=datastore.data)
         blank_watch_no_filters['url'] = tmp_watch.get('url')
 
@@ -120,6 +126,18 @@ def prepare_filter_prevew(datastore, watch_uuid, form_data):
     except Exception as e:
         text_before_filter = f"Error: {str(e)}"
 
+    # LLM preview extraction — asks the LLM to directly answer the intent
+    # against the current filtered content (no diff comparison).
+    # e.g. intent "how many articles?" → answer "30 articles listed"
+    # Results are NOT cached back to the real watch.
+    llm_evaluation = None
+    try:
+        from changedetectionio.llm.evaluator import preview_extract
+        if text_after_filter and text_after_filter.strip() not in ('', 'Empty content'):
+            llm_evaluation = preview_extract(tmp_watch, datastore, content=text_after_filter)
+    except Exception as e:
+        logger.warning(f"LLM preview evaluation failed for {watch_uuid}: {e}")
+
     logger.trace(f"Parsed in {time.time() - now:.3f}s")
 
     return ({
@@ -128,6 +146,7 @@ def prepare_filter_prevew(datastore, watch_uuid, form_data):
         'blocked_line_numbers': blocked_line_numbers,
         'duration': time.time() - now,
         'ignore_line_numbers': ignore_line_numbers,
+        'llm_evaluation': llm_evaluation,
         'trigger_line_numbers': trigger_line_numbers,
         })
 

changedetectionio/processors/text_json_diff/difference.py

@@ -7,6 +7,7 @@ a side-by-side or unified diff view with syntax highlighting and change markers.
 
 import os
 import time
+from flask_babel import gettext
 from loguru import logger
 
 from changedetectionio import diff, strtobool
@@ -97,6 +98,7 @@ DIFF_PREFERENCES_CONFIG = {
     'added': {'default': True, 'type': 'bool'},
     'replaced': {'default': True, 'type': 'bool'},
     'type': {'default': 'diffLines', 'type': 'value'},
+    'llm_all_changes': {'default': False, 'type': 'bool'},
 }
 
 def render(watch, datastore, request, url_for, render_template, flash, redirect, extract_form=None):
@@ -198,6 +200,23 @@ def render(watch, datastore, request, url_for, render_template, flash, redirect,
     if str(from_version) != str(dates[-2]) or str(to_version) != str(dates[-1]):
         note = 'Note: You are not viewing the latest changes.'
 
+    llm_configured = bool(
+        datastore.data.get('settings', {}).get('application', {}).get('llm', {}).get('model')
+    )
+
+    # Load cached AI diff summary for this exact from→to + prompt combination
+    viewing_latest = str(to_version) == str(dates[-1])
+    llm_diff_summary = ''
+    llm_summary_prompt = ''
+    if llm_configured:
+        try:
+            from changedetectionio.llm.evaluator import get_effective_summary_prompt
+            _prompt = get_effective_summary_prompt(watch, datastore)
+            llm_summary_prompt = _prompt
+            llm_diff_summary = watch.get_llm_diff_summary(from_version, to_version, prompt=_prompt)
+        except Exception as e:
+            logger.warning(f"Could not load llm-diff-summary for {uuid}: {e}")
+
     output = render_template("diff.html",
                              #initial_scroll_line_number=100,
                              bottom_horizontal_offscreen_contents=offscreen_content,
@@ -205,9 +224,9 @@ def render(watch, datastore, request, url_for, render_template, flash, redirect,
                              current_diff_url=watch['url'],
                              diff_cell_grid=diff_cell_grid,
                              diff_prefs=diff_prefs,
-                             extra_classes='difference-page',
+                             extra_classes=' '.join(filter(None, ['difference-page', 'llm-configured' if llm_configured else ''])),
                              extra_stylesheets=extra_stylesheets,
-                             extra_title=f" - {watch.label} - History",
+                             extra_title=f" - {watch.label} - {gettext('History')}",
                              extract_form=extract_form,
                              from_version=str(from_version),
                              is_html_webdriver=is_html_webdriver,
@@ -224,5 +243,9 @@ def render(watch, datastore, request, url_for, render_template, flash, redirect,
                              uuid=uuid,
                              versions=dates,  # All except current/last
                              watch_a=watch,
+                             llm_configured=llm_configured,
+                             llm_diff_summary=llm_diff_summary,
+                             llm_summary_prompt=llm_summary_prompt,
+                             viewing_latest=viewing_latest,
                              )
     return output

changedetectionio/processors/text_json_diff/processor.py

@@ -85,6 +85,10 @@ class FilterConfig:
             self._subtractive_selectors_cache = [*tag_selectors, *watch_selectors, *global_selectors]
         return self._subtractive_selectors_cache
 
+    @property
+    def extract_lines_containing(self):
+        return self._get_merged_rules('extract_lines_containing')
+
     @property
     def extract_text(self):
         return self._get_merged_rules('extract_text')
@@ -101,6 +105,30 @@ class FilterConfig:
     def text_should_not_be_present(self):
         return self._get_merged_rules('text_should_not_be_present')
 
+    def get_filter_config_hash(self):
+        """
+        Stable hash of the effective filter configuration.
+
+        Used by the skip-logic in run_changedetection() so that any change to
+        global settings, tag overrides, or watch filters automatically invalidates
+        the raw-content-unchanged shortcut — without needing scattered
+        clear_all_last_checksums() calls at every settings mutation site.
+        """
+        app = self.datastore.data['settings']['application']
+        config = {
+            'extract_lines_containing': sorted(self.extract_lines_containing),
+            'extract_text':             sorted(self.extract_text),
+            'ignore_text':              sorted(self.ignore_text),
+            'include_filters':          sorted(self.include_filters),
+            'subtractive_selectors':    sorted(self.subtractive_selectors),
+            'text_should_not_be_present': sorted(self.text_should_not_be_present),
+            'trigger_text':             sorted(self.trigger_text),
+            # Global processing flags not captured by the filter lists above
+            'ignore_whitespace':        app.get('ignore_whitespace', False),
+            'strip_ignored_lines':      app.get('strip_ignored_lines', False),
+        }
+        return hashlib.md5(json.dumps(config, sort_keys=True).encode()).hexdigest()
+
     @property
     def has_include_filters(self):
         return bool(self.include_filters) and bool(self.include_filters[0].strip())
@@ -135,6 +163,17 @@ class ContentTransformer:
         text = text.replace("\n\n", "\n")
         return '\n'.join(sorted(text.splitlines(), key=lambda x: x.lower()))
 
+    @staticmethod
+    def extract_lines_containing(text, substrings):
+        """Keep only lines that contain at least one of the given substrings (case-insensitive)."""
+        needles = [s.lower() for s in substrings if s.strip()]
+        if not needles:
+            return text
+        return '\n'.join(
+            line for line in text.splitlines()
+            if any(needle in line.lower() for needle in needles)
+        )
+
     @staticmethod
     def extract_by_regex(text, regex_patterns):
         """Extract text matching regex patterns."""
@@ -377,19 +416,26 @@ class perform_site_check(difference_detection_processor):
             raise Exception("Watch no longer exists.")
 
         current_raw_document_checksum = self.get_raw_document_checksum()
-        # Skip processing only if BOTH conditions are true:
-        # 1. HTML content unchanged (checksum matches last saved checksum)
-        # 2. Watch configuration was not edited (including trigger_text, filters, etc.)
-        # The was_edited flag handles all watch configuration changes, so we don't need
-        # separate checks for trigger_text or other processing rules.
+
+        # Build filter config up front so we can hash it for the skip check.
+        filter_config = FilterConfig(watch, self.datastore)
+        current_filter_config_hash = filter_config.get_filter_config_hash()
+
+        # Skip only when ALL of these hold:
+        #   1. raw HTML is unchanged
+        #   2. watch config was not edited (was_edited covers per-watch field changes)
+        #   3. effective filter config is unchanged (covers global/tag setting changes that
+        #      bypass was_edited — e.g. global_ignore_text, global_subtractive_selectors)
+        # last_filter_config_hash being False means first run or upgrade: don't skip.
         if (not force_reprocess and
             not watch.was_edited and
             self.last_raw_content_checksum and
-            self.last_raw_content_checksum == current_raw_document_checksum):
+            self.last_raw_content_checksum == current_raw_document_checksum and
+            watch.get('last_filter_config_hash') and
+            watch.get('last_filter_config_hash') == current_filter_config_hash):
             raise checksumFromPreviousCheckWasTheSame()
 
-        # Initialize components
-        filter_config = FilterConfig(watch, self.datastore)
+        # Initialize remaining components
         content_processor = ContentProcessor(self.fetcher, watch, filter_config, self.datastore)
         transformer = ContentTransformer()
         rule_engine = RuleEngine()
@@ -410,6 +456,7 @@ class perform_site_check(difference_detection_processor):
 
         # Save the raw content checksum to file (processor implementation detail, not watch config)
         self.update_last_raw_content_checksum(current_raw_document_checksum)
+        update_obj['last_filter_config_hash'] = current_filter_config_hash
 
         # === CONTENT PREPROCESSING ===
         # Avoid creating unnecessary intermediate string copies by reassigning only when needed
@@ -503,6 +550,10 @@ class perform_site_check(difference_detection_processor):
 
         update_obj["last_check_status"] = self.fetcher.get_last_status_code()
 
+        # === LINE FILTER (plain-text substring) ===
+        if filter_config.extract_lines_containing:
+            stripped_text = transformer.extract_lines_containing(stripped_text, filter_config.extract_lines_containing)
+
         # === REGEX EXTRACTION ===
         if filter_config.extract_text:
             extracted = transformer.extract_by_regex(stripped_text, filter_config.extract_text)
@@ -536,8 +587,8 @@ class perform_site_check(difference_detection_processor):
         # === BLOCKING RULES EVALUATION ===
         blocked = False
 
-        # Check trigger_text
-        if rule_engine.evaluate_trigger_text(stripped_text, filter_config.trigger_text):
+        # Check trigger_text - use text_for_checksuming so ignore_text can suppress trigger_text
+        if rule_engine.evaluate_trigger_text(text_for_checksuming, filter_config.trigger_text):
             blocked = True
 
         # Check text_should_not_be_present

changedetectionio/static/js/modal.js

@@ -3,6 +3,13 @@
  * Provides accessible, animated confirmation dialogs
  */
 
+// Escapes a string for safe insertion via innerHTML
+function _modalEscapeHTML(str) {
+  const div = document.createElement('div');
+  div.textContent = str;
+  return div.innerHTML;
+}
+
 const ModalDialog = {
   /**
    * Show a confirmation dialog
@@ -125,9 +132,10 @@ const ModalDialog = {
    * @param {Function} onConfirm - Callback when confirmed
    */
   confirmDelete: function(itemName, onConfirm) {
+    const safeName = _modalEscapeHTML(itemName);
     return this.confirm({
-      title: 'Delete ' + itemName + '?',
-      message: `<p>Are you sure you want to delete <strong>${itemName}</strong>?</p><p>This action cannot be undone.</p>`,
+      title: 'Delete ' + safeName + '?',
+      message: `<p>Are you sure you want to delete <strong>${safeName}</strong>?</p><p>This action cannot be undone.</p>`,
       type: 'danger',
       confirmText: 'Delete',
       cancelText: 'Cancel',
@@ -141,9 +149,10 @@ const ModalDialog = {
    * @param {Function} onConfirm - Callback when confirmed
    */
   confirmUnlink: function(itemName, onConfirm) {
+    const safeName = _modalEscapeHTML(itemName);
     return this.confirm({
-      title: 'Unlink ' + itemName + '?',
-      message: `<p>Are you sure you want to unlink all watches from <strong>${itemName}</strong>?</p><p>The tag will be kept but watches will be removed from it.</p>`,
+      title: 'Unlink ' + safeName + '?',
+      message: `<p>Are you sure you want to unlink all watches from <strong>${safeName}</strong>?</p><p>The tag will be kept but watches will be removed from it.</p>`,
       type: 'warning',
       confirmText: 'Unlink',
       cancelText: 'Cancel',
@@ -172,11 +181,11 @@ $(document).ready(function() {
     const url = $element.attr('href');
 
     const config = {
-      type: $element.data('confirm-type') || 'danger',
-      title: $element.data('confirm-title') || 'Confirm Action',
-      message: $element.data('confirm-message') || '<p>Are you sure you want to proceed?</p>',
-      confirmText: $element.data('confirm-button') || 'Confirm',
-      cancelText: $element.data('cancel-button') || 'Cancel',
+      type: $element.attr('data-confirm-type') || 'danger',
+      title: $element.attr('data-confirm-title') || 'Confirm Action',
+      message: $element.attr('data-confirm-message') || '<p>Are you sure you want to proceed?</p>',
+      confirmText: $element.attr('data-confirm-button') || 'Confirm',
+      cancelText: $element.attr('data-cancel-button') || 'Cancel',
       onConfirm: function() {
         // If it's a link, navigate to the URL
         if ($element.is('a')) {

changedetectionio/static/js/notifications.js

@@ -1,5 +1,20 @@
+function checkDiscordHtmlWarning() {
+    var urls = $('textarea.notification-urls').val() || '';
+    var format = $('select.notification-format').val() || '';
+    var isDiscord = /discord:\/\/|https:\/\/discord(?:app)?\.com\/api/i.test(urls);
+    var isHtml = format === 'html' || format === 'htmlcolor';
+    if (isDiscord && isHtml) {
+        $('#discord-html-format-warning').show();
+    } else {
+        $('#discord-html-format-warning').hide();
+    }
+}
+
 $(document).ready(function () {
 
+    $('textarea.notification-urls, select.notification-format').on('change input', checkDiscordHtmlWarning);
+    checkDiscordHtmlWarning();
+
     $('#add-email-helper').click(function (e) {
         e.preventDefault();
         email = prompt("Destination email");

changedetectionio/static/js/sub-tabs.js

@@ -0,0 +1,79 @@
+/**
+ * sub-tabs.js — Vertical sub-tab switcher.
+ *
+ * Finds every .stab-shell on the page and wires up tab switching.
+ * The shell needs an id= attribute for localStorage persistence.
+ *
+ * HTML contract (generated by _stab.html macros):
+ *   .stab-shell#some-id
+ *     .stab-nav
+ *       button.stab-btn[data-stab="foo"]
+ *     .stab-body
+ *       .stab-pane[data-stab="foo"]
+ *
+ * Any element inside the shell with data-stab-goto="tab-id" triggers
+ * navigation to that pane when clicked (for CTA buttons etc.).
+ */
+
+(function () {
+  'use strict';
+
+  function initShell(shell) {
+    var shellId    = shell.id;
+    var storageKey = shellId ? 'stab:' + shellId : null;
+
+    var btns  = Array.prototype.slice.call(shell.querySelectorAll('.stab-nav .stab-btn'));
+    var panes = Array.prototype.slice.call(shell.querySelectorAll('.stab-body .stab-pane'));
+
+    if (!btns.length || !panes.length) return;
+
+    var validIds = btns.map(function (b) { return b.dataset.stab; });
+
+    function activate(tabId) {
+      if (validIds.indexOf(tabId) === -1) return;
+
+      btns.forEach(function (b) {
+        b.classList.toggle('active', b.dataset.stab === tabId);
+      });
+      panes.forEach(function (p) {
+        p.classList.toggle('active', p.dataset.stab === tabId);
+      });
+
+      if (storageKey) {
+        try { localStorage.setItem(storageKey, tabId); } catch (e) {}
+      }
+    }
+
+    // Nav button clicks
+    btns.forEach(function (btn) {
+      btn.addEventListener('click', function () { activate(btn.dataset.stab); });
+    });
+
+    // data-stab-goto navigation from CTA buttons anywhere inside the shell
+    shell.addEventListener('click', function (e) {
+      var el = e.target.closest('[data-stab-goto]');
+      if (el && shell.contains(el)) {
+        e.preventDefault();
+        activate(el.dataset.stabGoto);
+      }
+    });
+
+    // Restore persisted tab or fall back to first tab
+    var stored = null;
+    if (storageKey) {
+      try { stored = localStorage.getItem(storageKey); } catch (e) {}
+    }
+    activate(stored && validIds.indexOf(stored) !== -1 ? stored : validIds[0]);
+  }
+
+  function initAll() {
+    var shells = document.querySelectorAll('.stab-shell');
+    shells.forEach(function (shell) { initShell(shell); });
+  }
+
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', initAll);
+  } else {
+    initAll();
+  }
+}());

changedetectionio/static/js/toggle-theme.js

@@ -10,6 +10,27 @@ $(document).ready(function () {
         setCookieValue(!isDark);
     });
 
+    // AI mode toggle — persisted in localStorage
+    (function initAiMode() {
+        const enabled = localStorage.getItem('ai-mode') === 'true';
+        $("html").attr("data-ai-mode", enabled ? "true" : "false");
+    })();
+
+    $(".toggle-ai-mode").on("click", function () {
+        if ($(this).data("llm-configured") !== true && $(this).data("llm-configured") !== "true") {
+            document.getElementById("llm-not-configured-modal").showModal();
+            return;
+        }
+        const current = $("html").attr("data-ai-mode") === "true";
+        const next = !current;
+        $("html").attr("data-ai-mode", next ? "true" : "false");
+        localStorage.setItem('ai-mode', next ? 'true' : 'false');
+    });
+
+    $("#close-llm-not-configured-modal").on("click", function () {
+        document.getElementById("llm-not-configured-modal").close();
+    });
+
     const setCookieValue = (value) => {
         document.cookie = `css_dark_mode=${value};max-age=31536000;path=/`
     }

changedetectionio/static/js/watch-overview.js

@@ -107,5 +107,118 @@ $(function () {
 
         nowtimeserver = nowtimeserver + time_check_step_size_seconds;
     }, time_check_step_size_seconds * 1000);
+
+    // LLM / AI features — only active when the server has LLM configured
+    if ($('body').hasClass('llm-configured')) {
+        var i18n = window.watchOverviewI18n || {};
+        var msgGenerating = i18n.generatingSummary || 'Generating summary…';
+        var msgHistory    = i18n.gotoHistory     || 'Goto full history';
+
+        // Reveal intent textarea on first keydown in the quick-add URL field
+        var $intentWrap = $('#quick-watch-llm-intent');
+        if ($intentWrap.length) {
+            $('#new-watch-form input[name="url"]').one('keydown', function () {
+                $intentWrap.slideDown(200);
+            });
+        }
+
+        // Inline AI summary — clicking the Summary button inserts a row below with AJAX content
+        $(document).on('click', '.ai-history-btn', function (e) {
+            if ($('html').attr('data-ai-mode') !== 'true') return; // normal navigation when AI mode is off
+
+            e.preventDefault();
+
+            var $btn   = $(this);
+            var uuid   = $btn.data('uuid');
+            var url    = $btn.data('summary-url');
+            var $row   = $btn.closest('tr');
+            var rowId  = 'ai-summary-row-' + uuid;
+            var cols   = $row.find('td').length;
+            var $tbody = $row.closest('tbody');
+
+            // Toggle: remove existing row if already open
+            if ($('#' + rowId).length) {
+                $('#' + rowId).remove();
+                $tbody.find('tr:not(.ai-inline-summary-row) td').css('background-color', '');
+                return;
+            }
+
+            // Snapshot row backgrounds BEFORE DOM mutation — inserting a <tr> shifts nth-child parity
+            var $dataRows = $tbody.find('tr:not(.ai-inline-summary-row)');
+            var bgMap = [];
+            $dataRows.each(function () {
+                bgMap.push($(this).find('td:first').css('background-color'));
+            });
+
+            var $summaryRow = $(
+                '<tr class="ai-inline-summary-row" id="' + rowId + '">' +
+                '<td colspan="' + cols + '">' +
+                '<div class="ai-inline-summary-content">' +
+                '<span class="ai-inline-spinner">&#x2728;</span>' +
+                '<div class="ai-inline-body">' +
+                '<span class="ai-inline-text">' + $('<span>').text(msgGenerating).html() + '</span>' +
+                '</div>' +
+                '</div>' +
+                '</td></tr>'
+            );
+            $row.after($summaryRow);
+
+            // Re-apply frozen backgrounds so the nth-child parity shift is invisible
+            $dataRows.each(function (i) {
+                $(this).find('td').css('background-color', bgMap[i]);
+            });
+
+            function formatSummary(text) {
+                var sectionRe = /^(Added|Changed|Removed|Updated|New|Deleted)\s*:/i;
+                return text.split('\n').map(function (line) {
+                    var safe = $('<span>').text(line).html();
+                    return sectionRe.test(line.trim())
+                        ? safe.replace(/^(\w[\w\s]*)(\s*:)/i, '<strong>$1$2</strong>')
+                        : safe;
+                }).join('<br>');
+            }
+
+            var promptUrl = url + '/prompt';
+
+            // Fire both requests simultaneously — prompt returns immediately, summary after LLM
+            $.getJSON(promptUrl)
+                .done(function (data) {
+                    if (data.prompt && $summaryRow.find('.ai-inline-summary-content:not(.loaded)').length) {
+                        $summaryRow.find('.ai-inline-body').append(
+                            '<span class="ai-inline-prompt">' + $('<span>').text(data.prompt).html() + '</span>'
+                        );
+                    }
+                });
+
+            $.getJSON(url)
+                .done(function (data) {
+                    var $content = $summaryRow.find('.ai-inline-summary-content');
+                    var historyUrl = $btn.attr('href');
+                    if (data.summary) {
+                        $content.addClass('loaded');
+                        $content.find('.ai-inline-text').html(formatSummary(data.summary));
+                        $content.find('.ai-inline-prompt').remove();
+                        $content.find('.ai-inline-body').append(
+                            '<a href="' + historyUrl + '" class="ai-inline-history-link">' +
+                            $('<span>').text(msgHistory).html() + '</a>'
+                        );
+                    } else if (data.error) {
+                        $summaryRow.find('td').html(
+                            '<span class="ai-inline-error">' + $('<span>').text(data.error).html() + '</span>'
+                        );
+                    } else {
+                        $summaryRow.remove();
+                    }
+                })
+                .fail(function (xhr) {
+                    var msg = (xhr.responseJSON && xhr.responseJSON.error)
+                        ? xhr.responseJSON.error
+                        : 'AI summary request failed (HTTP ' + xhr.status + ').';
+                    $summaryRow.find('td').html(
+                        '<span class="ai-inline-error">' + $('<span>').text(msg).html() + '</span>'
+                    );
+                });
+        });
+    }
 });
 

changedetectionio/static/js/watch-settings.js

@@ -12,7 +12,14 @@ function request_textpreview_update() {
         data[name] = $element.is(':checkbox') ? ($element.is(':checked') ? $element.val() : false) : $element.val();
     });
 
+    // llm_intent lives in a separate (potentially hidden) tab — include it explicitly
+    const $llmIntent = $('textarea[name="llm_intent"]');
+    if ($llmIntent.length) {
+        data['llm_intent'] = $llmIntent.val();
+    }
+
     $('body').toggleClass('spinner-active', 1);
+    $('#llm-preview-result').hide();
 
     $.abortiveSingularAjax({
         type: "POST",
@@ -41,6 +48,21 @@ function request_textpreview_update() {
                     'title': "No change-detection will occur because this text exists."
                 }
             ])
+
+        // LLM preview extraction result
+        const $llmResult = $('#llm-preview-result');
+        if ($llmResult.length && data['llm_evaluation']) {
+            const ev = data['llm_evaluation'];
+            const found = ev['found'];
+            $llmResult.attr('data-found', found ? '1' : '0');
+            $llmResult.find('.llm-preview-verdict').text(
+                found ? '✓ Would trigger a change' : '✗ Would not trigger a change'
+            );
+            $llmResult.find('.llm-preview-answer').text(ev['answer'] || '');
+            $llmResult.show();
+        } else if ($llmResult.length) {
+            $llmResult.hide();
+        }
     }).fail(function (error) {
         if (error.statusText === 'abort') {
             console.log('Request was aborted due to a new request being fired.');

changedetectionio/static/styles/scss/diff.scss

@@ -245,4 +245,4 @@ body.difference-page {
       padding-right: 1rem;
     }
   }
-}
+}

changedetectionio/static/styles/scss/parts/_edit.scss

@@ -1,3 +1,14 @@
+// LLM intent/summary textareas are prose, not code — override the
+// .monospaced-textarea rules so they wrap vertically, not scroll horizontally.
+#llm-intent-section textarea {
+  white-space: normal;
+  overflow-wrap: break-word;
+  overflow-x: hidden;
+  overflow-y: auto;
+  resize: vertical;
+  font-family: inherit;
+}
+
 ul#conditions_match_logic {
     list-style: none;
   input, label, li {

changedetectionio/static/styles/scss/parts/_llm.scss

@@ -0,0 +1,200 @@
+// ── AI / LLM shared styles ────────────────────────────────────────────────────
+// Used by both the diff page (#llm-diff-summary-area) and the watchlist
+// inline summary row (.ai-inline-summary-row).
+
+// ── Diff page: summary block ──────────────────────────────────────────────────
+#llm-diff-summary-area {
+  margin: 0.6rem 0 0.4rem;
+  padding: 0.65rem 0.9rem;
+  background: linear-gradient(135deg, rgba(120, 80, 200, 0.18), rgba(80, 160, 220, 0.14));
+  border-left: 3px solid rgba(140, 90, 220, 0.8);
+  border-radius: 0 4px 4px 0;
+  min-width: 0;
+  max-width: 100%;
+  box-sizing: border-box;
+  overflow: hidden;
+
+  .llm-diff-summary-label {
+    display: block;
+    font-size: 0.7rem;
+    font-weight: 700;
+    letter-spacing: 0.06em;
+    text-transform: uppercase;
+    opacity: 0.55;
+    margin-bottom: 0.25rem;
+  }
+
+  .llm-diff-summary-text {
+    margin: 0;
+    font-size: 0.9rem;
+    line-height: 1.5;
+    white-space: pre-wrap;
+    overflow-wrap: break-word;
+    word-break: break-word;
+  }
+}
+
+.llm-diff-summary-prompt {
+  margin: 0.4em 0 0;
+  font-size: 0.78rem;
+  font-style: italic;
+  overflow: hidden;
+  max-height: 3.8em;
+  animation: llm-prompt-reveal 0.7s ease-out both;
+
+  .llm-diff-summary-prompt-text {
+    display: block;
+    opacity: 0.55;
+    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.85) 30%, rgba(0,0,0,0) 100%);
+    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.85) 30%, rgba(0,0,0,0) 100%);
+    white-space: pre-wrap;
+    overflow-wrap: break-word;
+    line-height: 1.45;
+  }
+}
+
+@keyframes llm-prompt-reveal {
+  from { opacity: 0; transform: translateY(-3px); }
+  to   { opacity: 1; transform: translateY(0); }
+}
+
+.llm-diff-summary-loading {
+  opacity: 0.5;
+  font-style: italic;
+  animation: llm-pulse 1.4s ease-in-out infinite;
+}
+
+@keyframes llm-pulse {
+  0%, 100% { opacity: 0.5; }
+  50%       { opacity: 0.2; }
+}
+
+.llm-budget-exceeded,
+.llm-error {
+  color: #c0392b;
+  font-weight: 600;
+  font-style: normal;
+  opacity: 1;
+}
+
+// ── Menu: AI mode toggle button ───────────────────────────────────────────────
+.toggle-ai-mode {
+  opacity: 0.4;
+  transition: opacity 0.2s ease, filter 0.2s ease;
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  color: var(--color-text-menu-link);
+
+  svg {
+    height: 1.2rem;
+    width: 1.2rem;
+  }
+
+  .ai-mode-label {
+    font-size: 0.75rem;
+    font-weight: 600;
+    letter-spacing: 0.04em;
+    line-height: 1;
+  }
+}
+
+html[data-ai-mode="true"] .toggle-ai-mode {
+  opacity: 1;
+  filter: drop-shadow(0 0 4px rgba(160, 100, 255, 0.7));
+}
+
+// ── Watchlist: History/Summary dual-label button ──────────────────────────────
+.btn-label-summary {
+  display: none;
+}
+
+html[data-ai-mode="true"] body.llm-configured {
+  .btn-label-history { display: none; }
+  .btn-label-summary { display: inline; }
+}
+
+// ── Watchlist: inline AI summary row ─────────────────────────────────────────
+.ai-inline-summary-row {
+  td {
+    white-space: normal !important;
+    word-break: break-word;
+    padding: 0.5rem 1rem 0.6rem 1.4rem !important;
+    background: linear-gradient(135deg, #f0ebff, #eaf0ff) !important;
+    border-top: 1px solid #c4b5fd !important;
+    border-left: 3px solid #8b5cf6 !important;
+    color: #1a0640 !important;
+    font-size: 0.85rem;
+    line-height: 1.5;
+  }
+
+  html[data-darkmode="true"] & td {
+    background: linear-gradient(135deg, #1c0d35, #0d1535) !important;
+    border-top: 1px solid #3b1f6e !important;
+    border-left-color: #8b5cf6 !important;
+    color: #e9d5ff !important;
+  }
+
+  .ai-inline-summary-content {
+    display: flex;
+    gap: 0.5rem;
+    align-items: flex-start;
+
+    .ai-inline-spinner {
+      flex-shrink: 0;
+      animation: llm-pulse 1.4s ease-in-out infinite;
+    }
+
+    .ai-inline-body {
+      display: flex;
+      flex-direction: column;
+      min-width: 0;
+    }
+
+    .ai-inline-text {
+      font-style: italic;
+      opacity: 0.75;
+      white-space: pre-wrap;
+    }
+
+    &.loaded .ai-inline-spinner {
+      animation: none;
+    }
+
+    &.loaded .ai-inline-text {
+      font-style: normal;
+      opacity: 1;
+    }
+  }
+
+  .ai-inline-history-link {
+    display: inline-block;
+    margin-top: 0.4rem;
+    font-size: 0.78rem;
+    font-weight: 700;
+    opacity: 0.7;
+    white-space: nowrap;
+
+    &:hover { opacity: 1; }
+  }
+
+  .ai-inline-error {
+    color: #c0392b;
+  }
+
+  .ai-inline-prompt {
+    display: block;
+    margin-top: 0.3em;
+    font-size: 0.75rem;
+    font-style: italic;
+    overflow: hidden;
+    max-height: 3.6em;
+    animation: llm-prompt-reveal 0.6s ease-out both;
+    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.7) 30%, rgba(0,0,0,0) 100%);
+    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.7) 30%, rgba(0,0,0,0) 100%);
+    opacity: 0.55;
+    line-height: 1.4;
+    white-space: pre-wrap;
+    overflow-wrap: break-word;
+  }
+}

changedetectionio/static/styles/scss/parts/_sub_tabs.scss

@@ -0,0 +1,476 @@
+// ── Vertical sub-tab layout ───────────────────────────────────────────────────
+// Reusable panel: left nav rail + right content area.
+// HTML structure:
+//   <div class="stab-shell" id="some-id">
+//     <nav class="stab-nav">
+//       <button class="stab-btn" data-stab="foo"><span class="stab-icon">⊞</span> Foo</button>
+//     </nav>
+//     <div class="stab-body">
+//       <div class="stab-pane" data-stab="foo">…content…</div>
+//     </div>
+//   </div>
+// JS: sub-tabs.js initialises all .stab-shell elements, toggles .active.
+// Form fields in hidden panes still submit (visibility:hidden, not display:none).
+
+.stab-shell {
+  display: flex;
+  align-items: stretch;
+  background: var(--color-background);
+  border: 1px solid rgba(0, 0, 0, 0.08);
+  border-radius: 8px;
+  overflow: hidden;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
+  margin-bottom: 1.5rem;
+}
+
+// ── Left nav rail ─────────────────────────────────────────────────────────────
+.stab-nav {
+  display: flex;
+  flex-direction: column;
+  width: 11rem;
+  flex-shrink: 0;
+  padding: 0.75rem 0;
+  gap: 1px;
+  background: linear-gradient(180deg,
+    rgba(0, 0, 0, 0.03) 0%,
+    rgba(0, 0, 0, 0.05) 100%
+  );
+  border-right: 1px solid rgba(0, 0, 0, 0.07);
+}
+
+.stab-btn {
+  position: relative;
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.65rem 0.9rem 0.65rem 1rem;
+  width: 100%;
+  background: none;
+  border: none;
+  border-left: 3px solid transparent;
+  border-radius: 0;
+  cursor: pointer;
+  font: inherit;
+  color: var(--color-text);
+  text-align: left;
+  opacity: 0.65;
+  transition: background 0.12s ease, opacity 0.12s ease, border-color 0.12s ease, color 0.12s ease;
+
+  &:hover {
+    background: rgba(0, 0, 0, 0.04);
+    opacity: 0.85;
+  }
+
+  &.active {
+    border-left-color: var(--color-menu-accent);
+    background: rgba(237, 89, 0, 0.07);
+    color: var(--color-menu-accent);
+    font-weight: 700;
+    opacity: 1;
+  }
+
+  .stab-icon {
+    font-size: 0.95rem;
+    width: 1.1rem;
+    text-align: center;
+    flex-shrink: 0;
+    opacity: 0.8;
+  }
+}
+
+// ── Right content area ────────────────────────────────────────────────────────
+.stab-body {
+  flex: 1;
+  min-width: 0;
+  padding: 1.4rem 1.6rem;
+  overflow-x: hidden;
+}
+
+// ── Individual pane — hidden but field values still submitted ─────────────────
+.stab-pane {
+  visibility: hidden;
+  height: 0;
+  overflow: hidden;
+
+  &.active {
+    visibility: visible;
+    height: auto;
+    overflow: visible;
+    animation: stab-enter 0.16s ease both;
+  }
+}
+
+@keyframes stab-enter {
+  from {
+    opacity: 0;
+    transform: translateY(5px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+// ── Generic overview pane layout (hero + feature cards + CTA) ─────────────────
+.stab-overview-hero {
+  margin-bottom: 1.5rem;
+
+  h3 {
+    margin: 0 0 0.3rem;
+    font-size: 1.05rem;
+  }
+
+  .stab-overview-glyph {
+    color: var(--color-menu-accent);
+    margin-right: 0.2rem;
+  }
+
+  p {
+    margin: 0;
+    font-size: 0.88rem;
+    color: var(--color-text-input-description);
+    max-width: 44rem;
+    line-height: 1.55;
+  }
+}
+
+.stab-overview-features {
+  display: flex;
+  flex-direction: column;
+  gap: 0.7rem;
+  margin-bottom: 1.6rem;
+}
+
+.stab-overview-feature {
+  display: flex;
+  gap: 0.85rem;
+  align-items: flex-start;
+  padding: 0.75rem 1rem;
+  border-radius: 6px;
+  background: rgba(0, 0, 0, 0.022);
+  border: 1px solid rgba(0, 0, 0, 0.05);
+  transition: background 0.12s ease;
+
+  &:hover {
+    background: rgba(0, 0, 0, 0.035);
+  }
+
+  .stab-overview-icon {
+    font-size: 1.1rem;
+    width: 1.6rem;
+    flex-shrink: 0;
+    text-align: center;
+    padding-top: 0.05rem;
+    opacity: 0.7;
+  }
+
+  .stab-overview-text {
+    > strong {
+      display: block;
+      margin-bottom: 0.2rem;
+    }
+
+    p {
+      color: var(--color-text-input-description);
+    }
+  }
+}
+
+.stab-overview-disclaimer {
+  display: flex;
+  gap: 0.75rem;
+  align-items: flex-start;
+  margin: 0 0 1.1rem;
+  padding: 0.85rem 1rem;
+  border-radius: 6px;
+  border: 1px solid rgba(211, 136, 0, 0.35);
+  background: rgba(255, 180, 0, 0.07);
+
+  .stab-disclaimer-icon {
+    font-size: 1.15rem;
+    flex-shrink: 0;
+    padding-top: 0.05rem;
+    color: #c07800;
+  }
+
+  .stab-disclaimer-body {
+    font-size: 0.85rem;
+    line-height: 1.55;
+
+    > strong {
+      display: block;
+      margin-bottom: 0.35rem;
+      color: #8a5500;
+      font-size: 0.87rem;
+    }
+
+    p {
+      margin: 0 0 0.45rem;
+      color: var(--color-text-input-description);
+    }
+
+    ul {
+      margin: 0 0 0.6rem;
+      padding-left: 1.25rem;
+      color: var(--color-text-input-description);
+
+      li {
+        margin-bottom: 0.2rem;
+      }
+    }
+  }
+
+  .stab-disclaimer-check {
+    display: flex;
+    gap: 0.5rem;
+    align-items: flex-start;
+    cursor: pointer;
+    font-size: 0.82rem;
+    color: var(--color-text-input-description);
+    font-weight: 600;
+
+    input[type="checkbox"] {
+      flex-shrink: 0;
+      margin-top: 0.18rem;
+      cursor: pointer;
+    }
+  }
+}
+
+.stab-overview-cta {
+  margin-top: 0.4rem;
+  display: flex;
+  align-items: center;
+  gap: 0.8rem;
+  flex-wrap: wrap;
+}
+
+.stab-configured-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4rem;
+  padding: 0.35rem 0.75rem;
+  background: rgba(39, 174, 96, 0.09);
+  border: 1px solid rgba(39, 174, 96, 0.28);
+  border-radius: 4px;
+  color: #2a7a4e;
+  font-size: 0.82rem;
+  font-weight: 600;
+}
+
+// ── Section header inside a pane ──────────────────────────────────────────────
+.stab-section-title {
+  font-size: 0.72rem;
+  font-weight: 700;
+  letter-spacing: 0.07em;
+  text-transform: uppercase;
+  opacity: 0.45;
+  margin: 1.4rem 0 0.6rem;
+
+  &:first-child {
+    margin-top: 0;
+  }
+}
+
+// ── Mobile: stack nav above content, buttons stay vertical ───────────────────
+@media (max-width: 600px) {
+  .stab-shell {
+    flex-direction: column;
+    min-height: unset;
+  }
+
+  .stab-nav {
+    width: 100%;
+    border-right: none;
+    border-bottom: 1px solid rgba(0, 0, 0, 0.07);
+    padding: 0.4rem 0;
+  }
+
+  .stab-body {
+    padding-left: 1rem;
+  }
+}
+
+// ── LLM Usage pane — stat cards ───────────────────────────────────────────────
+.llm-usage-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
+  gap: 0.9rem;
+  margin-bottom: 1.4rem;
+}
+
+.llm-stat-card {
+  padding: 1rem 1.1rem 0.85rem;
+  border-radius: 7px;
+  background: rgba(0, 0, 0, 0.025);
+  border: 1px solid rgba(0, 0, 0, 0.07);
+
+  .llm-stat-label {
+    font-size: 0.7rem;
+    font-weight: 700;
+    letter-spacing: 0.07em;
+    text-transform: uppercase;
+    opacity: 0.4;
+    margin-bottom: 0.4rem;
+  }
+
+  .llm-stat-value {
+    font-size: 1.65rem;
+    font-weight: 700;
+    letter-spacing: -0.02em;
+    line-height: 1;
+    margin-bottom: 0.25rem;
+  }
+
+  .llm-stat-sub {
+    font-size: 0.79rem;
+    opacity: 0.5;
+  }
+
+  .llm-stat-budget-text {
+    font-size: 0.77rem;
+    opacity: 0.55;
+    margin-top: 0.3rem;
+  }
+}
+
+.llm-stat-bar-wrap {
+  height: 4px;
+  border-radius: 2px;
+  background: rgba(0, 0, 0, 0.1);
+  overflow: hidden;
+  margin-top: 0.65rem;
+}
+
+.llm-stat-bar-fill {
+  height: 100%;
+  border-radius: 2px;
+  transition: width 0.5s ease;
+
+  &.bar-ok   { background: #27ae60; }
+  &.bar-warn { background: #e67e22; }
+  &.bar-over { background: #c0392b; }
+}
+
+// ── Usage settings rows ────────────────────────────────────────────────────────
+.llm-usage-settings {
+  border-top: 1px solid rgba(0, 0, 0, 0.07);
+  padding-top: 0.9rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.65rem;
+}
+
+.llm-usage-row {
+  display: flex;
+  align-items: baseline;
+  gap: 0.9rem;
+  flex-wrap: wrap;
+
+  .llm-usage-row-label {
+    font-size: 0.82rem;
+    font-weight: 600;
+    opacity: 0.6;
+    min-width: 12rem;
+    flex-shrink: 0;
+  }
+
+  .llm-usage-row-value {
+    display: flex;
+    align-items: baseline;
+    gap: 0.5rem;
+    flex-wrap: wrap;
+    font-size: 0.88rem;
+  }
+}
+
+.llm-field-hint {
+  font-size: 0.8rem;
+  opacity: 0.55;
+}
+
+.llm-env-badge {
+  font-size: 0.79rem;
+  opacity: 0.6;
+}
+
+.llm-budget-alert {
+  color: #c0392b;
+  font-weight: 600;
+  font-size: 0.88rem;
+  margin: 0 0 1rem;
+}
+
+.llm-no-usage {
+  opacity: 0.5;
+  font-style: italic;
+  font-size: 0.88rem;
+  margin-bottom: 1rem;
+}
+
+// ── Dark mode ─────────────────────────────────────────────────────────────────
+html[data-darkmode="true"] {
+  .stab-shell {
+    border-color: rgba(255, 255, 255, 0.07);
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
+  }
+
+  .stab-nav {
+    background: linear-gradient(180deg,
+      rgba(255, 255, 255, 0.025) 0%,
+      rgba(255, 255, 255, 0.04) 100%
+    );
+    border-right-color: rgba(255, 255, 255, 0.07);
+  }
+
+  .stab-btn {
+    &:hover {
+      background: rgba(255, 255, 255, 0.05);
+    }
+
+    &.active {
+      background: rgba(237, 89, 0, 0.12);
+    }
+  }
+
+  .stab-overview-feature {
+    background: rgba(255, 255, 255, 0.025);
+    border-color: rgba(255, 255, 255, 0.05);
+
+    &:hover {
+      background: rgba(255, 255, 255, 0.04);
+    }
+  }
+
+  .stab-configured-badge {
+    background: rgba(39, 174, 96, 0.1);
+    border-color: rgba(39, 174, 96, 0.22);
+    color: #5db880;
+  }
+
+  .stab-overview-disclaimer {
+    border-color: rgba(255, 190, 50, 0.22);
+    background: rgba(255, 180, 0, 0.05);
+
+    .stab-disclaimer-icon {
+      color: #c9963a;
+    }
+
+    .stab-disclaimer-body > strong {
+      color: #c9a050;
+    }
+  }
+
+  .llm-stat-card {
+    background: rgba(255, 255, 255, 0.03);
+    border-color: rgba(255, 255, 255, 0.07);
+  }
+
+  .llm-stat-bar-wrap {
+    background: rgba(255, 255, 255, 0.1);
+  }
+
+  .llm-usage-settings {
+    border-top-color: rgba(255, 255, 255, 0.07);
+  }
+}

changedetectionio/static/styles/scss/parts/_watch_table-mobile.scss

@@ -47,12 +47,12 @@ $grid-gap: 0.5rem;
 
     .last-checked::before {
       color: var(--color-text);
-      content: "Last Checked ";
+      content: attr(data-label) " ";
     }
 
     .last-changed::before {
       color: var(--color-text);
-      content: "Last Changed ";
+      content: attr(data-label) " ";
     }
 
     /* Force table to not be like tables anymore */

changedetectionio/static/styles/scss/styles.scss

@@ -28,10 +28,12 @@
 @use "parts/action_sidebar";
 @use "parts/hamburger_menu";
 @use "parts/search_modal";
+@use "parts/llm";
 @use "parts/notification_bubble";
 @use "parts/toast";
 @use "parts/login_form";
 @use "parts/tabs";
+@use "parts/sub_tabs";
 
 // Smooth transitions for theme switching
 body,

changedetectionio/store/__init__.py

@@ -980,12 +980,20 @@ class ChangeDetectionStore(DatastoreUpdatesMixin, FileSavingDataStore):
     def get_all_tags_for_watch(self, uuid):
         """This should be in Watch model but Watch doesn't have access to datastore, not sure how to solve that yet"""
         watch = self.data['watching'].get(uuid)
+        if not watch:
+            return {}
 
-        # Should return a dict of full tag info linked by UUID
-        if watch:
-            return dictfilt(self.__data['settings']['application']['tags'], watch.get('tags', []))
+        # Start with manually assigned tags
+        result = dictfilt(self.__data['settings']['application']['tags'], watch.get('tags', []))
 
-        return {}
+        # Additionally include any tag whose url_match_pattern matches this watch's URL
+        watch_url = watch.get('url', '')
+        if watch_url:
+            for tag_uuid, tag in self.__data['settings']['application']['tags'].items():
+                if tag_uuid not in result and tag.matches_url(watch_url):
+                    result[tag_uuid] = tag
+
+        return result
 
     @property
     def extra_browsers(self):

changedetectionio/templates/_common_fields.html

@@ -1,7 +1,7 @@
 
 {% from '_helpers.html' import render_field %}
 
-{% macro show_token_placeholders(extra_notification_token_placeholder_info, suffix="") %}
+{% macro show_token_placeholders(extra_notification_token_placeholder_info, suffix="", settings_application=None) %}
 
 
     <div class="pure-controls">
@@ -98,6 +98,14 @@
                 <td><code>{{ '{{diff_patch}}' }}</code></td>
                 <td>{{ _('The diff output - patch in unified format') }}</td>
             </tr>
+            <tr>
+                <td><code>{{ '{{diff_changed_from}}' }}</code></td>
+                <td>{{ _('Only the changed words/values from the previous version — e.g. the old price. Best when a single value changes per line; multiple changed fragments are joined by newline.') }}</td>
+            </tr>
+            <tr>
+                <td><code>{{ '{{diff_changed_to}}' }}</code></td>
+                <td>{{ _('Only the changed words/values from the new version — e.g. the new price. Best when a single value changes per line; multiple changed fragments are joined by newline.') }}</td>
+            </tr>
             <tr>
                 <td><code>{{ '{{current_snapshot}}' }}</code></td>
                 <td>{{ _('The current snapshot text contents value, useful when combined with JSON or CSS filters') }}
@@ -106,7 +114,25 @@
             <tr>
                 <td><code>{{ '{{triggered_text}}' }}</code></td>
                 <td>{{ _('Text that tripped the trigger from filters') }}</td>
-
+            </tr>
+            {% if settings_application and settings_application.get('llm', {}).get('model') %}
+            <tr>
+                <td><code>{{ '{{diff}}' }}</code> <small style="opacity:0.6">{{ _('(upgraded)') }}</small></td>
+                <td>{{ _('When AI Change Summary is configured, contains the AI-generated description instead of the raw diff. Falls back to raw diff when not configured.') }}</td>
+            </tr>
+            <tr>
+                <td><code>{{ '{{raw_diff}}' }}</code></td>
+                <td>{{ _('Always the raw +/- diff, regardless of AI Change Summary setting.') }}</td>
+            </tr>
+            <tr>
+                <td><code>{{ '{{llm_summary}}' }}</code></td>
+                <td>{{ _('The AI Change Summary text (same as the upgraded {{diff}} — explicit reference).') }}</td>
+            </tr>
+            <tr>
+                <td><code>{{ '{{llm_intent}}' }}</code></td>
+                <td>{{ _('The AI Change Intent that was evaluated.') }}</td>
+            </tr>
+            {% endif %}
                 {% if extra_notification_token_placeholder_info %}
                     {% for token in extra_notification_token_placeholder_info %}
                         <tr>
@@ -136,7 +162,8 @@
                             }}
                             <div class="pure-form-message-inline">
                                 <p>
-                                <strong>{{ _('Tip:') }}</strong> {{ _('Use') }} <a target="newwindow" href="https://github.com/caronc/apprise">{{ _('AppRise Notification URLs') }}</a> {{ _('for notification to just about any service!') }} <i><a target="newwindow" href="https://github.com/dgtlmoon/changedetection.io/wiki/Notification-configuration-notes">{{ _('Please read the notification services wiki here for important configuration notes') }}</a></i>.<br>
+                                <strong>{{ _('Tip:') }}</strong> {{ _('Use <a target="newwindow" href="%(url)s">AppRise Notification URLs</a> for notification to just about any service!',
+                                    url='https://github.com/caronc/apprise')|safe }} <a target="newwindow" href="https://github.com/dgtlmoon/changedetection.io/wiki/Notification-configuration-notes">{{ _('<i>Please read the notification services wiki here for important configuration notes</i>')|safe }}</a>.<br>
 </p>
                                 <div data-target="#advanced-help-notifications" class="toggle-show pure-button button-tag button-xsmall">{{ _('Show advanced help and tips') }}</div>
                                 <ul style="display: none" id="advanced-help-notifications">
@@ -144,7 +171,7 @@
                                 <li><code><a target="newwindow" href="https://github.com/caronc/apprise/wiki/Notify_telegram">tgram://</a></code> {{ _('bots can\'t send messages to other bots, so you should specify chat ID of non-bot user.') }}</li>
                                 <li><code><a target="newwindow" href="https://github.com/caronc/apprise/wiki/Notify_telegram">tgram://</a></code> {{ _('only supports very limited HTML and can fail when extra tags are sent,') }} <a href="https://core.telegram.org/bots/api#html-style">{{ _('read more here') }}</a> {{ _('(or use plaintext/markdown format)') }}</li>
                                 <li><code>gets://</code>, <code>posts://</code>, <code>puts://</code>, <code>deletes://</code> {{ _('for direct API calls (or omit the') }} "<code>s</code>" {{ _('for non-SSL ie') }} <code>get://</code>) <a href="https://github.com/dgtlmoon/changedetection.io/wiki/Notification-configuration-notes#postposts">{{ _('more help here') }}</a></li>
-                                  <li>{{ _('Accepts the') }} <code>{{ '{{token}}' }}</code> {{ _('placeholders listed below') }}</li>
+                                  <li>{{ _('Accepts the <code>%(token)s</code> placeholders listed below', token='{{token}}')|safe }}</li>
                               </ul>
                             </div>
                             <div class="notifications-wrapper">
@@ -165,7 +192,7 @@
                             </div>
                             <div class="pure-control-group">
                                 {{ render_field(form.notification_body , rows=5, class="notification-body", placeholder=settings_application['notification_body']) }}
-                                {{ show_token_placeholders(extra_notification_token_placeholder_info=extra_notification_token_placeholder_info) }}
+                                {{ show_token_placeholders(extra_notification_token_placeholder_info=extra_notification_token_placeholder_info, settings_application=settings_application) }}
                                 <div class="pure-form-message-inline">
                                     <ul>
                                     <li><span class="pure-form-message-inline">
@@ -187,6 +214,10 @@
                             <div class="">
                                 {{ render_field(form.notification_format , class="notification-format") }}
                                 <span class="pure-form-message-inline">{{ _('Format for all notifications') }}</span>
+                                <div id="discord-html-format-warning" class="inline-warning" style="display: none; margin-top: 6px;">
+                                    <img class="inline-warning-icon" src="{{url_for('static_content', group='images', filename='notice.svg')}}" alt="{{ _('Note') }}" title="{{ _('Note') }}">
+                                    {{ _('Discord does not render HTML — switch to') }} <strong>{{ _('Plain Text') }}</strong> {{ _('format to avoid') }} <code>&amp;nbsp;</code> {{ _('and other HTML entities appearing literally in your notifications.') }}
+                                </div>
                             </div>
                         </div>
 {% endmacro %}

changedetectionio/templates/_helpers.html

@@ -179,13 +179,6 @@
   </div>
 {% endmacro %}
 
-
-{% macro playwright_warning() %}
-    <p><strong>{{ _('Error - This watch needs Chrome (with playwright/sockpuppetbrowser), but Chrome based fetching is not enabled.') }}</strong> {{ _('Alternatively try our') }} <a href="https://changedetection.io">{{ _('very affordable subscription based service which has all this setup for you') }}</a>.</p>
-    <p>{{ _('You may need to') }} <a href="https://github.com/dgtlmoon/changedetection.io/blob/09ebc6ec6338545bdd694dc6eee57f2e9d2b8075/docker-compose.yml#L31">{{ _('Enable playwright environment variable') }}</a> {{ _('and uncomment the') }} <strong>sockpuppetbrowser</strong> {{ _('in the') }} <a href="https://github.com/dgtlmoon/changedetection.io/blob/master/docker-compose.yml">docker-compose.yml</a> {{ _('file') }}.</p>
-    <br>
-{% endmacro %}
-
 {% macro render_time_schedule_form(form, available_timezones, timezone_default_config) %}
     <style>
     .day-schedule *, .day-schedule select {

changedetectionio/templates/_stab.html

@@ -0,0 +1,47 @@
+{#
+  Vertical sub-tab macros — reusable across any settings pane.
+
+  Usage:
+    {% from '_stab.html' import stab_shell, stab_pane %}
+
+    {% call stab_shell('my-shell-id', [
+        {'id': 'overview', 'label': _('Overview'), 'icon': '✦'},
+        {'id': 'settings', 'label': _('Settings'), 'icon': '⚙'},
+    ]) %}
+      {% call stab_pane('overview') %}
+        <p>Overview content…</p>
+      {% endcall %}
+      {% call stab_pane('settings') %}
+        <p>Settings content…</p>
+      {% endcall %}
+    {% endcall %}
+
+  Tabs are switched by sub-tabs.js (looks for .stab-shell elements).
+  Hidden panes use visibility:hidden so form fields inside still submit.
+  Active tab is persisted in localStorage keyed by shell id.
+
+  data-stab-goto="tab-id" on any element inside the shell navigates to that tab.
+#}
+
+{% macro stab_shell(shell_id, tabs) %}
+<div class="stab-shell" id="{{ shell_id }}">
+  <nav class="stab-nav" aria-label="{{ _('Settings sections') }}">
+    {%- for tab in tabs %}
+    <button class="stab-btn" type="button" data-stab="{{ tab.id }}" aria-controls="stab-pane-{{ tab.id }}">
+      {%- if tab.get('icon') %}<span class="stab-icon" aria-hidden="true">{{ tab.icon }}</span>{% endif -%}
+      {{ tab.label }}
+    </button>
+    {%- endfor %}
+  </nav>
+  <div class="stab-body">
+    {{ caller() }}
+  </div>
+</div>
+{% endmacro %}
+
+
+{% macro stab_pane(tab_id) %}
+<div class="stab-pane" data-stab="{{ tab_id }}" id="stab-pane-{{ tab_id }}" role="tabpanel">
+  {{ caller() }}
+</div>
+{% endmacro %}

changedetectionio/templates/base.html

@@ -45,6 +45,10 @@
     <script src="{{url_for('static_content', group='js', filename='socket.io.min.js')}}"></script>
     <script src="{{url_for('static_content', group='js', filename='realtime.js')}}" defer></script>
     {% endif %}
+    {%- set _html_head_extras = get_html_head_extras() -%}
+    {%- if _html_head_extras %}
+    {{ _html_head_extras | safe }}
+    {%- endif %}
   </head>
 
   <body class="{{extra_classes}}">
@@ -65,7 +69,7 @@
         {% else %}
           {% if new_version_available and not(has_password and not current_user.is_authenticated) %}
             <span id="new-version-text" class="pure-menu-heading">
-              <a href="https://changedetection.io">A new version is available</a>
+              <a href="https://changedetection.io">{{ _('A new version is available') }}</a>
             </span>
           {% endif %}
         {% endif %}
@@ -231,7 +235,7 @@
             {% if session['share-link'] %}
               <ul class="messages with-share-link">
                 <li class="message">
-                  Share this link:
+                  {{ _('Share this link:') }}
                   <span id="share-link">{{ session['share-link'] }}</span>
                   <img style="height: 1em; display: inline-block" src="{{url_for('static_content', group='images', filename='copy.svg')}}" >
                 </li>
@@ -277,6 +281,20 @@
       </div>
     </dialog>
 
+    <!-- LLM Not Configured Modal -->
+    <dialog id="llm-not-configured-modal" class="modal-dialog" aria-labelledby="llm-not-configured-modal-title">
+      <div class="modal-header">
+        <h2 class="modal-title" id="llm-not-configured-modal-title">{{ _('AI / LLM not configured') }}</h2>
+      </div>
+      <div class="modal-body">
+        <p>{{ _('LLM-powered summaries are not yet enabled. Configure an AI provider in Settings to get started.') }}</p>
+        <p><a href="{{ url_for('settings.settings_page') }}#ai" class="pure-button pure-button-primary">{{ _('Go to AI / LLM Settings') }}</a></p>
+      </div>
+      <div class="modal-footer">
+        <button type="button" class="pure-button" id="close-llm-not-configured-modal">{{ _('Close') }}</button>
+      </div>
+    </dialog>
+
     <!-- Search Modal -->
     {% if current_user.is_authenticated or not has_password %}
     <dialog id="search-modal" class="modal-dialog" aria-labelledby="search-modal-title">
@@ -286,7 +304,7 @@
       <div class="modal-body">
         <form id="search-form" method="GET">
           <div class="pure-control-group">
-            <label for="search-modal-input">{{ _('URL or Title') }}{% if active_tag_uuid %} {{ _('in') }} '{{ active_tag.title }}'{% endif %}</label>
+            <label for="search-modal-input">{% if active_tag_uuid %}{{ _("URL or Title in '%(title)s'", title=active_tag.title) }}{% else %}{{ _('URL or Title') }}{% endif %}</label>
             <input id="search-modal-input" class="m-d" name="q" placeholder="{{ _('Enter search term...') }}" required type="text" value="" autofocus>
             <input name="tags" type="hidden" value="{% if active_tag_uuid %}{{active_tag_uuid}}{% endif %}">
           </div>

changedetectionio/templates/edit/include_llm_intent.html

@@ -0,0 +1,126 @@
+{#
+  AI Intent + AI Change Summary section — shared include for watch edit and tag/group edit.
+
+  Required template context:
+    llm_configured  — bool: LLM provider is configured in settings
+    form            — the WTForms form (must have .llm_intent and .llm_change_summary fields)
+
+  Optional (watch edit only):
+    watch               — the Watch object (for processor check and prefilter display)
+    llm_group_overrides — dict returned by _resolve_llm_group_overrides():
+                          {'llm_intent': {'value': str, 'group_name': str} | None,
+                           'llm_change_summary': {'value': str, 'group_name': str} | None}
+                          Present only in watch edit context; absent in tag edit context.
+
+  Usage in watch edit (edit.html):
+    {% include "edit/include_llm_intent.html" %}
+
+  Usage in tag edit (edit-tag.html):
+    {% include "edit/include_llm_intent.html" %}
+    (watch is not set → tag mode: no processor check, no examples, different description)
+#}
+{% from '_helpers.html' import render_field %}
+
+{# Processor check only applies in watch-edit context (llm_group_overrides present). #}
+{# In tag/group edit context the AI section is always visible.                        #}
+{% if llm_group_overrides is defined %}
+    {% set is_text_json_diff = not watch.get('processor') or watch.get('processor') == 'text_json_diff' %}
+{% else %}
+    {% set is_text_json_diff = true %}
+{% endif %}
+
+{% if is_text_json_diff %}
+
+{# ── Configured: show the intent + summary fields ────────────────── #}
+{% if llm_configured %}
+<div class="border-fieldset" id="llm-intent-section">
+    <h3>&#x2728; {{ _('AI') }}</h3>
+
+    {# — AI Change Intent — #}
+    <h4 style="margin: 0 0 0.3em 0;">{{ _('AI — Notify when…') }}</h4>
+    <p class="pure-form-message-inline" style="margin-top:0">
+        {% if watch is defined and watch %}
+            {{ _('Describe what you care about. The AI evaluates every detected change against this and only notifies you when it matches.') }}
+        {% else %}
+            {{ _('Set a change intent for all watches in this tag/group. Each watch can override with its own.') }}
+        {% endif %}
+    </p>
+    <div class="pure-control-group">
+        {% if watch is defined and watch and llm_group_overrides is defined and llm_group_overrides.llm_intent %}
+            {% set intent_placeholder = _("From group '%(name)s': %(value)s", name=llm_group_overrides.llm_intent.group_name, value=llm_group_overrides.llm_intent.value) %}
+        {% elif watch is defined and watch %}
+            {% set intent_placeholder = _('e.g. Alert me when the price drops below $300, or a new product is launched. Ignore footer and navigation changes.') %}
+        {% else %}
+            {% set intent_placeholder = _('e.g. Flag price changes or new product launches across all watches in this group') %}
+        {% endif %}
+        {{ render_field(form.llm_intent, placeholder=intent_placeholder, rows=5, class="pure-input-1") }}
+    </div>
+    {% if watch is defined and watch %}
+    <div class="pure-form-message-inline">
+        <strong>{{ _('Examples:') }}</strong>
+        <ul style="margin: 0.3em 0 0 1.2em; padding: 0;">
+            <li><em>{{ _('Only notify if the price drops below $200, or a limited-time deal is added') }}</em></li>
+            <li><em>{{ _('Alert when a new recall, safety notice, or product withdrawal is published') }}</em></li>
+            <li><em>{{ _('Notify when a new grant round opens or an application deadline is announced') }}</em></li>
+            <li><em>{{ _('Only important if package versions change or a CVE is mentioned') }}</em></li>
+        </ul>
+    </div>
+    {% if watch.get('llm_prefilter') %}
+    <div class="pure-form-message-inline" style="margin-top: 0.5em;">
+        <small>{{ _('AI pre-filter active: <code>%(filter)s</code> — narrows content scope before evaluation', filter=watch.get('llm_prefilter')|e) | safe }}</small>
+    </div>
+    {% endif %}
+    {% endif %}
+
+    <hr style="margin: 1.2em 0; border: none; border-top: 1px solid var(--color-border, #ddd);">
+
+    {# — AI Change Summary — #}
+    <h4 style="margin: 0 0 0.3em 0;">{{ _('AI Change Summary') }}</h4>
+    <p class="pure-form-message-inline" style="margin-top:0">
+        {% if watch is defined and watch %}
+            {{ _('When a change is detected, the AI describes it according to your instructions and replaces <code>%(diff)s</code> in your notification. Use <code>%(raw_diff)s</code> if you still want the original diff.',
+                 diff='{{diff}}', raw_diff='{{raw_diff}}') | safe }}
+        {% else %}
+            {{ _('Describe how changes should be summarised in notifications for all watches in this group.') }}
+        {% endif %}
+    </p>
+    <div class="pure-control-group">
+        {% if watch is defined and watch and llm_group_overrides is defined and llm_group_overrides.llm_change_summary %}
+            {% set summary_placeholder = _("From group '%(name)s': %(value)s", name=llm_group_overrides.llm_change_summary.group_name, value=llm_group_overrides.llm_change_summary.value) %}
+        {% else %}
+            {% set summary_placeholder = form.llm_change_summary.render_kw['placeholder'] %}
+        {% endif %}
+        {{ render_field(form.llm_change_summary, placeholder=summary_placeholder, rows=5, class="pure-input-1") }}
+    </div>
+    <div style="margin-top: 0.3em;">
+        <a href="#" class="pure-button button-xsmall" onclick="var t=document.getElementById('llm_change_summary'); if(!t.value&amp;&amp;t.placeholder) t.value=t.placeholder; return false;">{{ _('Modify default prompt') }}</a>
+    </div>
+    {% if watch is defined and watch %}
+    <div class="pure-form-message-inline">
+        <strong>{{ _('Examples:') }}</strong>
+        <ul style="margin: 0.3em 0 0 1.2em; padding: 0;">
+            <li><em>{{ _('List each new item added with its name and price. Translate to English.') }}</em></li>
+            <li><em>{{ _('Summarise what events were added or cancelled. Two sentences maximum.') }}</em></li>
+            <li><em>{{ _('Describe the price change: old price, new price, percentage difference.') }}</em></li>
+        </ul>
+    </div>
+    {% endif %}
+</div>
+
+{# ── Not configured: greyed-out prompt to configure ──────────────── #}
+{% else %}
+<div class="border-fieldset" id="llm-intent-section-disabled" style="opacity: 0.5;">
+    <h3>&#x2728; {{ _('AI') }}</h3>
+    <p>
+       {% if watch is defined and watch %}
+           {{ _('Configure an AI / LLM provider in <a href="%(url)s">Settings → AI / LLM</a> to enable AI Change Intent and AI Change Summary.',
+                url=url_for('settings.settings_page') + '#ai') | safe }}
+       {% else %}
+           {{ _('Configure an AI / LLM provider in <a href="%(url)s">Settings → AI / LLM</a> to enable AI features for this group.',
+                url=url_for('settings.settings_page') + '#ai') | safe }}
+       {% endif %}
+    </p>
+</div>
+{% endif %}
+
+{% endif %}{# is_text_json_diff #}

changedetectionio/templates/edit/include_subtract.html

@@ -7,33 +7,33 @@ xpath://body/div/span[contains(@class, 'example-class')]",
                         %}
                         {{ field }}
                         {% if '/text()' in  field %}
-                          <span class="pure-form-message-inline"><strong>Note!: //text() function does not work where the &lt;element&gt; contains &lt;![CDATA[]]&gt;</strong></span><br>
+                          <span class="pure-form-message-inline"><strong>{{ _('Note!: //text() function does not work where the <element> contains <![CDATA[]]>') }}</strong></span><br>
                         {% endif %}
-                        <span class="pure-form-message-inline">One CSS, xPath 1 &amp; 2, JSON Path/JQ selector per line, <i>any</i> rules that matches will be used.<br>
-                        <span data-target="#advanced-help-selectors" class="toggle-show pure-button button-tag button-xsmall">Show advanced help and tips</span><br>
+                        <span class="pure-form-message-inline">{{ _('One CSS, xPath 1 & 2, JSON Path/JQ selector per line, <i>any</i> rules that matches will be used.') | safe }}<br>
+                        <span data-target="#advanced-help-selectors" class="toggle-show pure-button button-tag button-xsmall">{{ _('Show advanced help and tips') }}</span><br>
                     <ul id="advanced-help-selectors" style="display: none;">
-                        <li>CSS - Limit text to this CSS rule, only text matching this CSS rule is included.</li>
+                        <li>CSS - {{ _('Limit text to this CSS rule, only text matching this CSS rule is included.') }}</li>
                         <li>JSON - Limit text to this JSON rule, using either <a href="https://pypi.org/project/jsonpath-ng/" target="new">JSONPath</a> or <a href="https://stedolan.github.io/jq/" target="new">jq</a> (if installed).
                             <ul>
-                                <li>JSONPath: Prefix with <code>json:</code>, use <code>json:$</code> to force re-formatting if required,  <a href="https://jsonpath.com/" target="new">test your JSONPath here</a>.</li>
+                                <li>JSONPath: {{ _('Prefix with <code>json:</code>, use <code>json:$</code> to force re-formatting if required,') | safe }} <a href="https://jsonpath.com/" target="new">{{ _('test your JSONPath here') }}</a>.</li>
                                 {% if jq_support %}
-                                <li>jq: Prefix with <code>jq:</code> and <a href="https://jqplay.org/" target="new">test your jq here</a>. Using <a href="https://stedolan.github.io/jq/" target="new">jq</a> allows for complex filtering and processing of JSON data with built-in functions, regex, filtering, and more. See examples and documentation <a href="https://stedolan.github.io/jq/manual/" target="new">here</a>. Prefix <code>jqraw:</code> outputs the results as text instead of a JSON list.</li>
+                                <li>jq: Prefix with <code>jq:</code> and <a href="https://jqplay.org/" target="new">test your jq here</a>. Using <a href="https://stedolan.github.io/jq/" target="new">jq</a> allows for complex filtering and processing of JSON data with built-in functions, regex, filtering, and more. See examples and documentation <a href="https://stedolan.github.io/jq/manual/" target="new">here</a>. {{ _('Prefix <code>jqraw:</code> outputs the results as text instead of a JSON list.') | safe }}</li>
                                 {% else %}
-                                <li>jq support not installed</li>
+                                <li>{{ _('jq support not installed') }}</li>
                                 {% endif %}
                             </ul>
                         </li>
-                        <li>XPath - Limit text to this XPath rule, simply start with a forward-slash. To specify XPath to be used explicitly or the XPath rule starts with an XPath function: Prefix with <code>xpath:</code>
+                        <li>XPath - {{ _('Limit text to this XPath rule, simply start with a forward-slash. To specify XPath to be used explicitly or the XPath rule starts with an XPath function: Prefix with <code>xpath:</code>') | safe }}
                             <ul>
-                                <li>Example:  <code>//*[contains(@class, 'sametext')]</code> or <code>xpath:count(//*[contains(@class, 'sametext')])</code>, <a
-                                href="http://xpather.com/" target="new">test your XPath here</a></li>
-                                <li>Example: Get all titles from an RSS feed <code>//title/text()</code></li>
-                                <li>To use XPath1.0: Prefix with <code>xpath1:</code></li>
+                                <li>{{ _('Example') }}:  <code>//*[contains(@class, 'sametext')]</code> or <code>xpath:count(//*[contains(@class, 'sametext')])</code>, <a
+                                href="http://xpather.com/" target="new">{{ _('test your XPath here') }}</a></li>
+                                <li>{{ _('Example') }}: {{ _('Get all titles from an RSS feed <code>//title/text()</code>') | safe }}</li>
+                                <li>{{ _('To use XPath1.0: Prefix with <code>xpath1:</code>') | safe }}</li>
                             </ul>
                             </li>
                     <li>
                         Please be sure that you thoroughly understand how to write CSS, JSONPath, XPath{% if jq_support %}, or jq selector{%endif%} rules before filing an issue on GitHub! <a
-                                href="https://github.com/dgtlmoon/changedetection.io/wiki/CSS-Selector-help">here for more CSS selector help</a>.<br>
+                                href="https://github.com/dgtlmoon/changedetection.io/wiki/CSS-Selector-help">{{ _('here for more CSS selector help') }}</a>.<br>
                     </li>
                     </ul>
 
@@ -47,9 +47,9 @@ nav
 //*[contains(text(), 'Advertisement')]") }}
                     <span class="pure-form-message-inline">
                         <ul>
-                          <li> Remove HTML element(s) by CSS and XPath selectors before text conversion. </li>
-                          <li> Don't paste HTML here, use only CSS and XPath selectors </li>
-                          <li> Add multiple elements, CSS or XPath selectors per line to ignore multiple parts of the HTML. </li>
+                          <li> {{ _('Remove HTML element(s) by CSS and XPath selectors before text conversion.') }} </li>
+                          <li> {{ _("Don't paste HTML here, use only CSS and XPath selectors") }} </li>
+                          <li> {{ _('Add multiple elements, CSS or XPath selectors per line to ignore multiple parts of the HTML.') }} </li>
                         </ul>
                       </span>
                 </fieldset>

changedetectionio/templates/edit/text-options.html

@@ -35,10 +35,10 @@
 
                 <fieldset>
                     <div class="pure-control-group">
-                        {{ render_field(form.text_should_not_be_present, rows=5, placeholder="For example: Out of stock
+                        {{ render_field(form.text_should_not_be_present, rows=5, placeholder=_("For example: Out of stock
 Sold out
 Not in stock
-Unavailable") }}
+Unavailable")) }}
                         <span class="pure-form-message-inline">
                             <ul>
                                 <li>{{ _('Block change-detection while this text is on the page, all text and regex are tested case-insensitive, good for waiting for when a product is available again') }}</li>
@@ -49,6 +49,21 @@ Unavailable") }}
                         </span>
                     </div>
                 </fieldset>
+                <fieldset>
+                    <div class="pure-control-group">
+                        {{ render_field(form.extract_lines_containing, rows=5, placeholder=_("celsius
+temperature
+price")) }}
+                        <span class="pure-form-message-inline">
+                            <ul>
+                                <li>{{ _('Keep only lines that contain any of these words or phrases (plain text, case-insensitive)') }}</li>
+                                <li>{{ _('One entry per line — any line in the page text that contains a match is kept') }}</li>
+                                <li>{{ _('Simpler alternative to regex — use this when you just want lines about a specific topic') }}</li>
+                                <li>{{ _('Example') }}: {{ _('enter <code>celsius</code> to keep only lines mentioning temperature readings')|safe }}</li>
+                            </ul>
+                        </span>
+                    </div>
+                </fieldset>
                 <fieldset>
                     <div class="pure-control-group">
                         {{ render_field(form.extract_text, rows=5, placeholder="/.+?\d+ comments.+?/
@@ -60,8 +75,8 @@ keyword") }}
                             <ul>
                                 <li>{{ _('Regular expression - example') }} <code>/reports.+?2022/i</code></li>
                                 <li>{{ _('Don\'t forget to consider the white-space at the start of a line') }} <code>/.+?reports.+?2022/i</code></li>
-                                <li>{{ _('Use') }} <code>//(?aiLmsux))</code> {{ _('type flags (more') }} <a href="https://docs.python.org/3/library/re.html#index-15">{{ _('information here') }}</a>)<br></li>
-                                <li>{{ _('Keyword example - example') }} <code>Out of stock</code></li>
+                                <li>{{ _('Use <code>//(?aiLmsux))</code> type flags (more <a href="%(url)s">information here</a>)', url='https://docs.python.org/3/library/re.html#index-15')|safe }}<br></li>
+                                <li>{{ _('Keyword example - example: <code>Out of stock</code>')|safe }}</li>
                                 <li>{{ _('Use groups to extract just that text - example') }} <code>/reports.+?(\d+)/i</code> {{ _('returns a list of years only') }}</li>
                                 <li>{{ _('Example - match lines containing a keyword') }} <code>/.*icecream.*/</code></li>
                             </ul>

changedetectionio/templates/menu.html

@@ -37,6 +37,10 @@
     </li>
 {% endif %}
     <li class="pure-menu-item menu-collapsible" id="inline-menu-extras-group">
+        <button class="toggle-button toggle-ai-mode" type="button" title="{{ _('Toggle AI Mode') }}" data-llm-configured="{{ 'true' if llm_configured else 'false' }}" data-llm-settings-url="{{ url_for('settings.settings_page') }}#ai">
+            <span class="visually-hidden">{{ _('Toggle AI mode') }}</span>
+            {% include "svgs/ai-mode-icon.svg" %}<span class="ai-mode-label">LLM</span>
+        </button>
         <button class="toggle-button toggle-light-mode " type="button" title="{{ _('Toggle Light/Dark Mode') }}">
             <span class="visually-hidden">{{ _('Toggle light/dark mode') }}</span>
             <span class="icon-light">

changedetectionio/templates/svgs/ai-mode-icon.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor">
+  <path d="M12 2L13.8 9.2L21 11L13.8 12.8L12 22L10.2 12.8L3 11L10.2 9.2Z"/>
+  <circle cx="20" cy="3.5" r="1.4" opacity="0.75"/>
+  <circle cx="18" cy="18.5" r="0.9" opacity="0.5"/>
+</svg>

changedetectionio/tests/llm/test_evaluator.py

@@ -0,0 +1,571 @@
+"""
+Unit tests for changedetectionio/llm/evaluator.py
+
+Uses mocked LLM calls — no real API key needed.
+"""
+import pytest
+from unittest.mock import patch, MagicMock
+
+
+def _make_datastore(llm_cfg=None, tags=None):
+    """Build a minimal datastore-like dict for testing."""
+    ds = MagicMock()
+    app_settings = {
+        'llm': llm_cfg or {},
+        'tags': tags or {},
+    }
+    ds.data = {
+        'settings': {
+            'application': app_settings,
+        }
+    }
+    return ds
+
+
+def _make_watch(llm_intent='', llm_change_summary='', tags=None, uuid='test-uuid-1234'):
+    w = {}
+    w['llm_intent'] = llm_intent
+    w['llm_change_summary'] = llm_change_summary
+    w['tags'] = tags or []
+    w['uuid'] = uuid
+    w['url'] = 'https://example.com'
+    w['page_title'] = 'Test Page'
+    w['llm_evaluation_cache'] = {}
+    w['llm_prefilter'] = None
+    return w
+
+
+# ---------------------------------------------------------------------------
+# resolve_intent
+# ---------------------------------------------------------------------------
+
+class TestResolveIntent:
+    def test_watch_intent_takes_priority(self):
+        from changedetectionio.llm.evaluator import resolve_intent
+
+        tag = {'title': 'mygroup', 'llm_intent': 'group intent'}
+        ds = _make_datastore(tags={'tag-1': tag})
+        watch = _make_watch(llm_intent='watch intent', tags=['tag-1'])
+
+        intent, source = resolve_intent(watch, ds)
+        assert intent == 'watch intent'
+        assert source == 'watch'
+
+    def test_tag_intent_used_when_watch_has_none(self):
+        from changedetectionio.llm.evaluator import resolve_intent
+
+        tag = {'title': 'pricing-group', 'llm_intent': 'flag price drops'}
+        ds = _make_datastore(tags={'tag-1': tag})
+        watch = _make_watch(llm_intent='', tags=['tag-1'])
+
+        intent, source = resolve_intent(watch, ds)
+        assert intent == 'flag price drops'
+        assert source == 'pricing-group'
+
+    def test_no_intent_anywhere_returns_empty(self):
+        from changedetectionio.llm.evaluator import resolve_intent
+
+        ds = _make_datastore()
+        watch = _make_watch(llm_intent='')
+
+        intent, source = resolve_intent(watch, ds)
+        assert intent == ''
+        assert source == ''
+
+    def test_tag_applied_to_all_watches_in_group(self):
+        """Tag intent propagates to every watch in the tag (no opt-in needed)."""
+        from changedetectionio.llm.evaluator import resolve_intent
+
+        tag = {'title': 'job-board', 'llm_intent': 'new engineering jobs'}
+        ds = _make_datastore(tags={'tag-1': tag})
+
+        # Three different watches, all in the tag, none have their own intent
+        for watch_uuid in ['uuid-A', 'uuid-B', 'uuid-C']:
+            watch = _make_watch(llm_intent='', tags=['tag-1'], uuid=watch_uuid)
+            intent, source = resolve_intent(watch, ds)
+            assert intent == 'new engineering jobs', f"Watch {watch_uuid} should inherit tag intent"
+            assert source == 'job-board'
+
+    def test_whitespace_only_intent_treated_as_empty(self):
+        from changedetectionio.llm.evaluator import resolve_intent
+
+        ds = _make_datastore()
+        watch = _make_watch(llm_intent='   ')
+        intent, source = resolve_intent(watch, ds)
+        assert intent == ''
+
+    def test_missing_tag_in_datastore_skipped(self):
+        from changedetectionio.llm.evaluator import resolve_intent
+
+        ds = _make_datastore(tags={})  # no tags registered
+        watch = _make_watch(llm_intent='', tags=['nonexistent-tag'])
+        intent, source = resolve_intent(watch, ds)
+        assert intent == ''
+
+
+# ---------------------------------------------------------------------------
+# get_llm_config
+# ---------------------------------------------------------------------------
+
+class TestGetLlmConfig:
+    def test_returns_none_when_no_model(self):
+        from changedetectionio.llm.evaluator import get_llm_config
+        ds = _make_datastore(llm_cfg={})
+        assert get_llm_config(ds) is None
+
+    def test_returns_config_when_model_set(self):
+        from changedetectionio.llm.evaluator import get_llm_config
+        cfg = {'model': 'gpt-4o-mini', 'api_key': 'sk-test'}
+        ds = _make_datastore(llm_cfg=cfg)
+        result = get_llm_config(ds)
+        assert result['model'] == 'gpt-4o-mini'
+
+    def test_env_var_overrides_datastore(self):
+        """LLM_MODEL env var takes priority over datastore settings."""
+        from changedetectionio.llm.evaluator import get_llm_config
+        ds = _make_datastore(llm_cfg={'model': 'datastore-model'})
+        with patch.dict('os.environ', {'LLM_MODEL': 'ollama/llama3.2', 'LLM_API_KEY': '', 'LLM_API_BASE': ''}):
+            result = get_llm_config(ds)
+        assert result['model'] == 'ollama/llama3.2'
+
+    def test_env_var_api_key_and_base_included(self):
+        """LLM_API_KEY and LLM_API_BASE are picked up alongside LLM_MODEL."""
+        from changedetectionio.llm.evaluator import get_llm_config
+        ds = _make_datastore()
+        env = {'LLM_MODEL': 'gpt-4o', 'LLM_API_KEY': 'env-key', 'LLM_API_BASE': 'http://localhost:11434'}
+        with patch.dict('os.environ', env):
+            result = get_llm_config(ds)
+        assert result['api_key'] == 'env-key'
+        assert result['api_base'] == 'http://localhost:11434'
+
+    def test_llm_configured_via_env_true_when_model_set(self):
+        """llm_configured_via_env() returns True when LLM_MODEL is set."""
+        from changedetectionio.llm.evaluator import llm_configured_via_env
+        with patch.dict('os.environ', {'LLM_MODEL': 'gpt-4o-mini'}):
+            assert llm_configured_via_env() is True
+
+    def test_llm_configured_via_env_false_when_not_set(self):
+        """llm_configured_via_env() returns False when LLM_MODEL is absent."""
+        from changedetectionio.llm.evaluator import llm_configured_via_env
+        env = {k: '' for k in ['LLM_MODEL', 'LLM_API_KEY', 'LLM_API_BASE']}
+        with patch.dict('os.environ', env, clear=False):
+            # Ensure LLM_MODEL is truly absent
+            import os
+            os.environ.pop('LLM_MODEL', None)
+            assert llm_configured_via_env() is False
+
+
+# ---------------------------------------------------------------------------
+# evaluate_change
+# ---------------------------------------------------------------------------
+
+class TestEvaluateChange:
+    def test_returns_none_when_llm_not_configured(self):
+        from changedetectionio.llm.evaluator import evaluate_change
+        ds = _make_datastore(llm_cfg={})  # no model
+        watch = _make_watch(llm_intent='flag price drops')
+        result = evaluate_change(watch, ds, diff='- $500\n+ $400')
+        assert result is None
+
+    def test_returns_none_when_no_intent(self):
+        from changedetectionio.llm.evaluator import evaluate_change
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_intent='')
+        result = evaluate_change(watch, ds, diff='some diff')
+        assert result is None
+
+    def test_returns_not_important_for_empty_diff(self):
+        from changedetectionio.llm.evaluator import evaluate_change
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_intent='flag price drops')
+        result = evaluate_change(watch, ds, diff='')
+        assert result == {'important': False, 'summary': ''}
+
+    def test_returns_not_important_for_whitespace_diff(self):
+        from changedetectionio.llm.evaluator import evaluate_change
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_intent='flag price drops')
+        result = evaluate_change(watch, ds, diff='   \n  ')
+        assert result == {'important': False, 'summary': ''}
+
+    def test_calls_llm_and_returns_result(self):
+        from changedetectionio.llm.evaluator import evaluate_change
+
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini', 'api_key': 'sk-test'})
+        watch = _make_watch(llm_intent='flag price drops')
+
+        llm_response = '{"important": true, "summary": "Price dropped from $500 to $400"}'
+        with patch('changedetectionio.llm.client.completion', return_value=(llm_response, 150)):
+            result = evaluate_change(watch, ds, diff='- $500\n+ $400')
+
+        assert result['important'] is True
+        assert 'Price dropped' in result['summary']
+
+    def test_cache_hit_skips_llm_call(self):
+        from changedetectionio.llm.evaluator import evaluate_change
+        import hashlib
+
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini', 'api_key': 'sk-test'})
+        watch = _make_watch(llm_intent='flag price drops')
+
+        diff = '- $500\n+ $400'
+        intent = 'flag price drops'
+        cache_key = hashlib.sha256(f"{intent}||{diff}".encode()).hexdigest()
+        watch['llm_evaluation_cache'] = {
+            cache_key: {'important': True, 'summary': 'cached result'}
+        }
+
+        with patch('changedetectionio.llm.client.completion') as mock_llm:
+            result = evaluate_change(watch, ds, diff=diff)
+            mock_llm.assert_not_called()
+
+        assert result['summary'] == 'cached result'
+
+    def test_llm_failure_returns_important_true(self):
+        """On LLM error, notification should NOT be suppressed (fail open)."""
+        from changedetectionio.llm.evaluator import evaluate_change
+
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini', 'api_key': 'sk-test'})
+        watch = _make_watch(llm_intent='flag price drops')
+
+        with patch('changedetectionio.llm.client.completion', side_effect=Exception('API timeout')):
+            result = evaluate_change(watch, ds, diff='- $500\n+ $400')
+
+        assert result['important'] is True
+        assert result['summary'] == ''
+
+    def test_unimportant_result_from_llm(self):
+        from changedetectionio.llm.evaluator import evaluate_change
+
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_intent='only alert on price drops')
+
+        llm_response = '{"important": false, "summary": "Only a footer copyright year changed"}'
+        with patch('changedetectionio.llm.client.completion', return_value=(llm_response, 45)):
+            result = evaluate_change(watch, ds, diff='- Copyright 2023\n+ Copyright 2024')
+
+        assert result['important'] is False
+        assert 'footer' in result['summary'].lower() or 'copyright' in result['summary'].lower()
+
+    def test_last_tokens_used_stored_after_eval(self):
+        """watch['llm_last_tokens_used'] is set to the token count after a successful call."""
+        from changedetectionio.llm.evaluator import evaluate_change
+
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_intent='flag price drops')
+
+        llm_response = '{"important": true, "summary": "Price fell"}'
+        with patch('changedetectionio.llm.client.completion', return_value=(llm_response, 123)):
+            evaluate_change(watch, ds, diff='- $500\n+ $300')
+
+        assert watch.get('llm_last_tokens_used') == 123
+
+    def test_cumulative_tokens_accumulate_across_evals(self):
+        """Each eval adds its tokens to watch['llm_tokens_used_cumulative']."""
+        from changedetectionio.llm.evaluator import evaluate_change
+
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_intent='flag price drops')
+
+        resp1 = '{"important": true, "summary": "First"}'
+        resp2 = '{"important": false, "summary": "Second"}'
+
+        with patch('changedetectionio.llm.client.completion', return_value=(resp1, 80)):
+            evaluate_change(watch, ds, diff='- $500\n+ $400')
+
+        # Second call needs a different diff to avoid cache hit
+        with patch('changedetectionio.llm.client.completion', return_value=(resp2, 60)):
+            evaluate_change(watch, ds, diff='- $400\n+ $350')
+
+        assert watch.get('llm_tokens_used_cumulative') == 140
+
+
+# ---------------------------------------------------------------------------
+# Token budget enforcement
+# ---------------------------------------------------------------------------
+
+class TestTokenBudget:
+    def test_no_limits_always_returns_true(self):
+        """When no limits configured, budget check always passes."""
+        from changedetectionio.llm.evaluator import _check_token_budget
+
+        watch = _make_watch()
+        cfg = {}  # no limits
+
+        assert _check_token_budget(watch, cfg, tokens_this_call=10_000) is True
+
+    def test_per_check_limit_exceeded_returns_false(self):
+        """Tokens on this call exceeding per-check limit → False."""
+        from changedetectionio.llm.evaluator import _check_token_budget
+
+        watch = _make_watch()
+        cfg = {'max_tokens_per_check': 100}
+
+        result = _check_token_budget(watch, cfg, tokens_this_call=150)
+        assert result is False
+
+    def test_per_check_limit_not_exceeded_returns_true(self):
+        """Tokens on this call within per-check limit → True."""
+        from changedetectionio.llm.evaluator import _check_token_budget
+
+        watch = _make_watch()
+        cfg = {'max_tokens_per_check': 200}
+
+        result = _check_token_budget(watch, cfg, tokens_this_call=150)
+        assert result is True
+
+    def test_cumulative_limit_exceeded_returns_false(self):
+        """Total accumulated tokens exceeding cumulative limit → False."""
+        from changedetectionio.llm.evaluator import _check_token_budget
+
+        watch = _make_watch()
+        watch['llm_tokens_used_cumulative'] = 900
+        cfg = {'max_tokens_cumulative': 1000}
+
+        # This call adds 200 → total 1100 > 1000
+        result = _check_token_budget(watch, cfg, tokens_this_call=200)
+        assert result is False
+
+    def test_cumulative_limit_not_yet_exceeded_returns_true(self):
+        """Total accumulated tokens within cumulative limit → True."""
+        from changedetectionio.llm.evaluator import _check_token_budget
+
+        watch = _make_watch()
+        watch['llm_tokens_used_cumulative'] = 500
+        cfg = {'max_tokens_cumulative': 1000}
+
+        result = _check_token_budget(watch, cfg, tokens_this_call=100)
+        assert result is True
+
+    def test_tokens_accumulated_into_watch(self):
+        """tokens_this_call is added to watch['llm_tokens_used_cumulative']."""
+        from changedetectionio.llm.evaluator import _check_token_budget
+
+        watch = _make_watch()
+        watch['llm_tokens_used_cumulative'] = 300
+        cfg = {}
+
+        _check_token_budget(watch, cfg, tokens_this_call=75)
+        assert watch['llm_tokens_used_cumulative'] == 375
+
+    def test_zero_tokens_call_does_not_change_cumulative(self):
+        """Calling with tokens_this_call=0 (pre-flight check) doesn't modify cumulative."""
+        from changedetectionio.llm.evaluator import _check_token_budget
+
+        watch = _make_watch()
+        watch['llm_tokens_used_cumulative'] = 200
+        cfg = {}
+
+        _check_token_budget(watch, cfg, tokens_this_call=0)
+        assert watch['llm_tokens_used_cumulative'] == 200
+
+    def test_evaluate_change_skips_call_when_cumulative_over_budget(self):
+        """Pre-flight cumulative check: if already over budget, skip LLM call and fail open."""
+        from changedetectionio.llm.evaluator import evaluate_change
+
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini', 'max_tokens_cumulative': 100})
+        watch = _make_watch(llm_intent='flag price drops')
+        watch['llm_tokens_used_cumulative'] = 500  # already far over
+
+        with patch('changedetectionio.llm.client.completion') as mock_llm:
+            result = evaluate_change(watch, ds, diff='- $500\n+ $400')
+            mock_llm.assert_not_called()
+
+        # Fail open: important=True so the notification is NOT suppressed
+        assert result == {'important': True, 'summary': ''}
+
+    def test_evaluate_change_per_check_limit_fails_open(self):
+        """Per-check token exceeded after call → result still returned (fail open)."""
+        from changedetectionio.llm.evaluator import evaluate_change
+
+        # max_tokens_per_check is 50, but the call returns 150 tokens
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini', 'max_tokens_per_check': 50})
+        watch = _make_watch(llm_intent='flag price drops')
+
+        llm_response = '{"important": false, "summary": "Only minor change"}'
+        with patch('changedetectionio.llm.client.completion', return_value=(llm_response, 150)):
+            result = evaluate_change(watch, ds, diff='- $500\n+ $499')
+
+        # LLM said not important, but even with per-check warning the result is returned
+        # (budget warning is logged but evaluation result is still used)
+        assert result is not None
+        assert 'important' in result
+
+
+# ---------------------------------------------------------------------------
+# resolve_llm_field (generic cascade)
+# ---------------------------------------------------------------------------
+
+class TestResolveLlmField:
+    def test_watch_value_takes_priority(self):
+        from changedetectionio.llm.evaluator import resolve_llm_field
+        tag = {'title': 'mygroup', 'llm_change_summary': 'tag summary prompt'}
+        ds = _make_datastore(tags={'tag-1': tag})
+        watch = _make_watch(llm_change_summary='watch summary prompt', tags=['tag-1'])
+        value, source = resolve_llm_field(watch, ds, 'llm_change_summary')
+        assert value == 'watch summary prompt'
+        assert source == 'watch'
+
+    def test_tag_value_used_when_watch_empty(self):
+        from changedetectionio.llm.evaluator import resolve_llm_field
+        tag = {'title': 'events-group', 'llm_change_summary': 'list new events'}
+        ds = _make_datastore(tags={'tag-1': tag})
+        watch = _make_watch(llm_change_summary='', tags=['tag-1'])
+        value, source = resolve_llm_field(watch, ds, 'llm_change_summary')
+        assert value == 'list new events'
+        assert source == 'events-group'
+
+    def test_returns_empty_when_not_set_anywhere(self):
+        from changedetectionio.llm.evaluator import resolve_llm_field
+        ds = _make_datastore()
+        watch = _make_watch()
+        value, source = resolve_llm_field(watch, ds, 'llm_change_summary')
+        assert value == ''
+        assert source == ''
+
+    def test_works_for_llm_intent_field_too(self):
+        """resolve_llm_field is generic — works for llm_intent same as llm_change_summary."""
+        from changedetectionio.llm.evaluator import resolve_llm_field
+        tag = {'title': 'grp', 'llm_intent': 'flag price drops'}
+        ds = _make_datastore(tags={'t1': tag})
+        watch = _make_watch(llm_intent='', tags=['t1'])
+        value, source = resolve_llm_field(watch, ds, 'llm_intent')
+        assert value == 'flag price drops'
+
+
+# ---------------------------------------------------------------------------
+# summarise_change
+# ---------------------------------------------------------------------------
+
+class TestSummariseChange:
+    def test_returns_empty_when_llm_not_configured(self):
+        from changedetectionio.llm.evaluator import summarise_change
+        ds = _make_datastore(llm_cfg={})
+        watch = _make_watch(llm_change_summary='List what changed')
+        result = summarise_change(watch, ds, diff='- old\n+ new')
+        assert result == ''
+
+    def test_uses_default_prompt_when_no_summary_prompt(self):
+        """When llm_change_summary is empty, falls back to DEFAULT_CHANGE_SUMMARY_PROMPT."""
+        from changedetectionio.llm.evaluator import summarise_change, DEFAULT_CHANGE_SUMMARY_PROMPT
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini', 'api_key': 'sk-test'})
+        watch = _make_watch(llm_change_summary='')
+        with patch('changedetectionio.llm.client.completion',
+                   return_value=('A new item was added.', 40)) as mock_llm:
+            result = summarise_change(watch, ds, diff='- old\n+ new')
+        mock_llm.assert_called_once()
+        # Default prompt must appear in the user message
+        call_messages = mock_llm.call_args.kwargs['messages']
+        user_msg = next(m['content'] for m in call_messages if m['role'] == 'user')
+        assert DEFAULT_CHANGE_SUMMARY_PROMPT in user_msg
+        assert result == 'A new item was added.'
+
+    def test_returns_empty_when_diff_empty(self):
+        from changedetectionio.llm.evaluator import summarise_change
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_change_summary='List what changed')
+        with patch('changedetectionio.llm.client.completion') as mock_llm:
+            result = summarise_change(watch, ds, diff='')
+            mock_llm.assert_not_called()
+        assert result == ''
+
+    def test_calls_llm_and_returns_plain_text(self):
+        from changedetectionio.llm.evaluator import summarise_change
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini', 'api_key': 'sk-test'})
+        watch = _make_watch(llm_change_summary='List new events in English')
+        with patch('changedetectionio.llm.client.completion',
+                   return_value=('3 new events added: Jazz Night, Art Show, Comedy Gig', 80)):
+            result = summarise_change(watch, ds, diff='+ Jazz Night\n+ Art Show\n+ Comedy Gig')
+        assert 'Jazz Night' in result
+        assert 'Art Show' in result
+
+    def test_cascades_from_tag(self):
+        """llm_change_summary on a tag propagates to watches in that tag."""
+        from changedetectionio.llm.evaluator import summarise_change
+        tag = {'title': 'events', 'llm_change_summary': 'Translate events to English'}
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'}, tags={'tag-1': tag})
+        watch = _make_watch(llm_change_summary='', tags=['tag-1'])
+        with patch('changedetectionio.llm.client.completion',
+                   return_value=('New concert added on Friday', 60)):
+            result = summarise_change(watch, ds, diff='+ Konzert am Freitag')
+        assert result == 'New concert added on Friday'
+
+    def test_llm_failure_raises(self):
+        """On LLM error, summarise_change re-raises so callers can surface the error."""
+        from changedetectionio.llm.evaluator import summarise_change
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_change_summary='Describe the change')
+        with patch('changedetectionio.llm.client.completion', side_effect=Exception('timeout')):
+            with pytest.raises(Exception, match='timeout'):
+                summarise_change(watch, ds, diff='- old\n+ new')
+
+    def test_uses_higher_token_limit_than_eval(self):
+        """summarise_change passes a dynamic max_tokens larger than the eval default (200)."""
+        from changedetectionio.llm.evaluator import summarise_change, _summary_max_tokens
+        ds = _make_datastore(llm_cfg={'model': 'gpt-4o-mini'})
+        watch = _make_watch(llm_change_summary='Describe changes')
+        diff = '- old\n+ new'
+        with patch('changedetectionio.llm.client.completion',
+                   return_value=('Some summary', 100)) as mock_llm:
+            summarise_change(watch, ds, diff=diff)
+        call_kwargs = mock_llm.call_args
+        passed_max_tokens = call_kwargs.kwargs.get('max_tokens')
+        assert passed_max_tokens == _summary_max_tokens(diff)
+        assert passed_max_tokens >= 400  # always more generous than eval cap of 200
+
+    def test_dynamic_token_cap_scales_with_diff_size(self):
+        """Larger diffs produce a higher max_tokens cap, bounded at 3000."""
+        from changedetectionio.llm.evaluator import _summary_max_tokens
+        assert _summary_max_tokens('x' * 100)   == 400   # floor
+        assert _summary_max_tokens('x' * 4000)  == 1000
+        assert _summary_max_tokens('x' * 12000) == 3000  # ceiling
+        assert _summary_max_tokens('x' * 99999) == 3000  # never exceeds ceiling
+
+
+# ---------------------------------------------------------------------------
+# compute_summary_cache_key / get_effective_summary_prompt
+# ---------------------------------------------------------------------------
+
+class TestSummaryCacheKey:
+    def test_same_inputs_produce_same_key(self):
+        from changedetectionio.llm.evaluator import compute_summary_cache_key
+        key1 = compute_summary_cache_key('+ new line', 'describe changes')
+        key2 = compute_summary_cache_key('+ new line', 'describe changes')
+        assert key1 == key2
+
+    def test_different_diff_produces_different_key(self):
+        from changedetectionio.llm.evaluator import compute_summary_cache_key
+        key1 = compute_summary_cache_key('+ line A', 'prompt')
+        key2 = compute_summary_cache_key('+ line B', 'prompt')
+        assert key1 != key2
+
+    def test_different_prompt_produces_different_key(self):
+        from changedetectionio.llm.evaluator import compute_summary_cache_key
+        key1 = compute_summary_cache_key('diff', 'list changes')
+        key2 = compute_summary_cache_key('diff', 'translate to English')
+        assert key1 != key2
+
+    def test_key_is_16_hex_chars(self):
+        from changedetectionio.llm.evaluator import compute_summary_cache_key
+        key = compute_summary_cache_key('diff', 'prompt')
+        assert len(key) == 16
+        assert all(c in '0123456789abcdef' for c in key)
+
+    def test_get_effective_prompt_returns_custom_when_set(self):
+        from changedetectionio.llm.evaluator import get_effective_summary_prompt
+        ds = _make_datastore()
+        watch = _make_watch(llm_change_summary='My custom prompt')
+        assert get_effective_summary_prompt(watch, ds) == 'My custom prompt'
+
+    def test_get_effective_prompt_returns_default_when_empty(self):
+        from changedetectionio.llm.evaluator import get_effective_summary_prompt, DEFAULT_CHANGE_SUMMARY_PROMPT
+        ds = _make_datastore()
+        watch = _make_watch(llm_change_summary='')
+        assert get_effective_summary_prompt(watch, ds) == DEFAULT_CHANGE_SUMMARY_PROMPT
+
+    def test_get_effective_prompt_cascades_from_tag(self):
+        from changedetectionio.llm.evaluator import get_effective_summary_prompt
+        tag = {'title': 'grp', 'llm_change_summary': 'tag-level prompt'}
+        ds = _make_datastore(tags={'t1': tag})
+        watch = _make_watch(llm_change_summary='', tags=['t1'])
+        assert get_effective_summary_prompt(watch, ds) == 'tag-level prompt'

changedetectionio/tests/llm/test_llm_restock_plugin.py

@@ -0,0 +1,313 @@
+"""
+Tests for the LLM restock fallback plugin.
+
+All LLM calls are mocked — no real API key required.
+"""
+import json
+import pytest
+from unittest.mock import patch, MagicMock
+
+
+def _make_datastore(llm_model='gpt-4o-mini', enabled=True):
+    """Minimal datastore mock with the fields the plugin reads."""
+    ds = MagicMock()
+    ds.data = {
+        'settings': {
+            'application': {
+                'llm_restock_use_fallback_extract': enabled,
+                'llm': {
+                    'model': llm_model,
+                    'api_key': 'test-key',
+                    'api_base': '',
+                    'tokens_total_cumulative': 0,
+                    'tokens_this_month': 0,
+                    'tokens_month_key': '2099-01',
+                    'cost_usd_total_cumulative': 0.0,
+                    'cost_usd_this_month': 0.0,
+                },
+            }
+        }
+    }
+    return ds
+
+
+def _call_plugin(content, url='https://example.com/product',
+                 llm_json=None, datastore=None, enabled=True, llm_intent=None):
+    """Helper: import plugin, inject datastore, call the hook, return result."""
+    from changedetectionio.processors.restock_diff.plugins import llm_restock
+
+    if datastore is None:
+        datastore = _make_datastore(enabled=enabled)
+    llm_restock.datastore = datastore
+
+    if llm_json is not None:
+        with patch('changedetectionio.llm.client.completion',
+                   return_value=(llm_json, 50, 40, 10)):
+            return llm_restock.get_itemprop_availability_override(
+                content=content,
+                fetcher_name='html_requests',
+                fetcher_instance=None,
+                url=url,
+                llm_intent=llm_intent,
+            )
+    else:
+        return llm_restock.get_itemprop_availability_override(
+            content=content,
+            fetcher_name='html_requests',
+            fetcher_instance=None,
+            url=url,
+            llm_intent=llm_intent,
+        )
+
+
+class TestLLMRestockPluginDisabled:
+    def test_returns_none_when_no_datastore(self):
+        from changedetectionio.processors.restock_diff.plugins import llm_restock
+        llm_restock.datastore = None
+        result = llm_restock.get_itemprop_availability_override(
+            content='<html><body>Price: $49.99 In Stock</body></html>',
+            fetcher_name='html_requests',
+            fetcher_instance=None,
+            url='https://example.com/product',
+        )
+        assert result is None
+
+    def test_returns_none_when_setting_disabled(self):
+        result = _call_plugin(
+            '<html><body>Price: $49.99 In Stock</body></html>',
+            enabled=False,
+        )
+        assert result is None
+
+    def test_returns_none_when_no_llm_configured(self):
+        ds = MagicMock()
+        ds.data = {
+            'settings': {
+                'application': {
+                    'llm_restock_use_fallback_extract': True,
+                    # No 'llm' key → get_llm_config returns None
+                }
+            }
+        }
+        result = _call_plugin(
+            '<html><body>Price: $49.99 In Stock</body></html>',
+            datastore=ds,
+        )
+        assert result is None
+
+    def test_returns_none_for_empty_content(self):
+        result = _call_plugin('', llm_json='{"price": 9.99, "currency": "USD", "availability": "instock"}')
+        assert result is None
+
+
+class TestLLMRestockPluginExtraction:
+    def test_extracts_price_and_in_stock(self):
+        llm_json = '{"price": 49.99, "currency": "USD", "availability": "instock"}'
+        result = _call_plugin(
+            '<html><body><span class="price">$49.99</span> <span>In Stock</span></body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['price'] == 49.99
+        assert result['currency'] == 'USD'
+        assert result['availability'] == 'instock'
+
+    def test_extracts_out_of_stock(self):
+        llm_json = '{"price": 129.00, "currency": "EUR", "availability": "outofstock"}'
+        result = _call_plugin(
+            '<html><body>129,00 € — Sold out</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['price'] == 129.0
+        assert result['currency'] == 'EUR'
+        assert result['availability'] == 'outofstock'
+
+    def test_returns_availability_only_when_no_price(self):
+        llm_json = '{"price": null, "currency": null, "availability": "instock"}'
+        result = _call_plugin(
+            '<html><body>Item available</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['price'] is None
+        assert result['availability'] == 'instock'
+
+    def test_returns_price_only_when_no_availability(self):
+        llm_json = '{"price": 19.95, "currency": "GBP", "availability": null}'
+        result = _call_plugin(
+            '<html><body>£19.95</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['price'] == 19.95
+        assert result['availability'] is None
+
+    def test_returns_none_when_both_null(self):
+        llm_json = '{"price": null, "currency": null, "availability": null}'
+        result = _call_plugin(
+            '<html><body>No pricing info here</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is None
+
+    def test_strips_markdown_fences(self):
+        llm_json = '```json\n{"price": 9.99, "currency": "USD", "availability": "instock"}\n```'
+        result = _call_plugin(
+            '<html><body>$9.99 In Stock</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['price'] == 9.99
+
+    def test_handles_integer_price(self):
+        llm_json = '{"price": 100, "currency": "USD", "availability": "instock"}'
+        result = _call_plugin(
+            '<html><body>$100 In Stock</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['price'] == 100.0
+
+    def test_handles_string_price(self):
+        """Model might return price as a string despite the prompt."""
+        llm_json = '{"price": "49.99", "currency": "USD", "availability": "instock"}'
+        result = _call_plugin(
+            '<html><body>$49.99</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['price'] == 49.99
+
+
+class TestLLMRestockPluginTokenAccounting:
+    def test_result_includes_token_metadata(self):
+        """Plugin result must carry _tokens/_input_tokens/_output_tokens/_model."""
+        llm_json = '{"price": 49.99, "currency": "USD", "availability": "instock"}'
+        result = _call_plugin(
+            '<html><body>$49.99 In Stock</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is not None
+        assert result['_tokens'] == 50
+        assert result['_input_tokens'] == 40
+        assert result['_output_tokens'] == 10
+        assert result['_model'] == 'gpt-4o-mini'
+
+    def test_token_keys_not_in_none_result(self):
+        """When LLM returns nothing useful, result is None — no token metadata leaked."""
+        llm_json = '{"price": null, "currency": null, "availability": null}'
+        result = _call_plugin(
+            '<html><body>No pricing info</body></html>',
+            llm_json=llm_json,
+        )
+        assert result is None
+
+
+class TestLLMRestockPluginIntent:
+    def test_llm_intent_appended_to_user_prompt(self):
+        """llm_intent should appear in the prompt sent to the LLM."""
+        from changedetectionio.processors.restock_diff.plugins import llm_restock
+        ds = _make_datastore()
+        llm_restock.datastore = ds
+
+        captured = {}
+        def fake_completion(model, messages, api_key, api_base, max_tokens):
+            captured['messages'] = messages
+            return ('{"price": 299.0, "currency": "USD", "availability": "instock"}', 50, 40, 10)
+
+        with patch('changedetectionio.llm.client.completion', side_effect=fake_completion):
+            result = llm_restock.get_itemprop_availability_override(
+                content='<html><body>$299 In Stock</body></html>',
+                fetcher_name='html_requests',
+                fetcher_instance=None,
+                url='https://example.com',
+                llm_intent='Alert me when price drops below $300',
+            )
+
+        assert result is not None
+        user_msg = next(m for m in captured['messages'] if m['role'] == 'user')
+        assert 'Alert me when price drops below $300' in user_msg['content']
+
+    def test_no_intent_prompt_unchanged(self):
+        """Without llm_intent the user prompt should not include the intent line."""
+        from changedetectionio.processors.restock_diff.plugins import llm_restock
+        ds = _make_datastore()
+        llm_restock.datastore = ds
+
+        captured = {}
+        def fake_completion(model, messages, api_key, api_base, max_tokens):
+            captured['messages'] = messages
+            return ('{"price": 9.99, "currency": "USD", "availability": "instock"}', 20, 15, 5)
+
+        with patch('changedetectionio.llm.client.completion', side_effect=fake_completion):
+            llm_restock.get_itemprop_availability_override(
+                content='<html><body>$9.99 In Stock</body></html>',
+                fetcher_name='html_requests',
+                fetcher_instance=None,
+                url='https://example.com',
+                llm_intent=None,
+            )
+
+        user_msg = next(m for m in captured['messages'] if m['role'] == 'user')
+        assert 'notification intent' not in user_msg['content']
+
+
+class TestLLMRestockPluginErrorHandling:
+    def test_returns_none_on_bad_json(self):
+        from changedetectionio.processors.restock_diff.plugins import llm_restock
+        ds = _make_datastore()
+        llm_restock.datastore = ds
+
+        with patch('changedetectionio.llm.client.completion',
+                   return_value=('not valid json at all', 10, 8, 2)):
+            result = llm_restock.get_itemprop_availability_override(
+                content='<html><body>$49.99 In Stock</body></html>',
+                fetcher_name='html_requests',
+                fetcher_instance=None,
+                url='https://example.com',
+            )
+        assert result is None
+
+    def test_returns_none_on_llm_exception(self):
+        from changedetectionio.processors.restock_diff.plugins import llm_restock
+        ds = _make_datastore()
+        llm_restock.datastore = ds
+
+        with patch('changedetectionio.llm.client.completion',
+                   side_effect=Exception("LLM timeout")):
+            result = llm_restock.get_itemprop_availability_override(
+                content='<html><body>$49.99 In Stock</body></html>',
+                fetcher_name='html_requests',
+                fetcher_instance=None,
+                url='https://example.com',
+            )
+        assert result is None
+
+
+class TestLLMRestockPluginHTMLStripping:
+    def test_strip_html_removes_tags(self):
+        from changedetectionio.processors.restock_diff.plugins.llm_restock import _strip_html
+        result = _strip_html('<html><body><p>Price: $10</p></body></html>')
+        assert '<' not in result
+        assert 'Price: $10' in result
+
+    def test_strip_html_removes_scripts(self):
+        from changedetectionio.processors.restock_diff.plugins.llm_restock import _strip_html
+        html = '<html><head><script>var x = 1;</script></head><body>In Stock</body></html>'
+        result = _strip_html(html)
+        assert 'var x' not in result
+        assert 'In Stock' in result
+
+    def test_strip_html_decodes_entities(self):
+        from changedetectionio.processors.restock_diff.plugins.llm_restock import _strip_html
+        result = _strip_html('Price: 49&nbsp;&amp;&nbsp;in stock')
+        assert '&amp;' not in result
+        assert '&nbsp;' not in result
+        assert 'in stock' in result
+
+    def test_strip_html_truncates_long_content(self):
+        from changedetectionio.processors.restock_diff.plugins.llm_restock import _strip_html, _MAX_CONTENT_CHARS
+        long_html = '<p>' + 'x' * (_MAX_CONTENT_CHARS * 2) + '</p>'
+        result = _strip_html(long_html)
+        assert len(result) <= _MAX_CONTENT_CHARS

changedetectionio/tests/llm/test_notification_tokens.py

@@ -0,0 +1,325 @@
+"""
+Tests that {{ llm_summary }} and {{ llm_intent }} notification tokens
+are correctly populated in the notification pipeline.
+
+Covers:
+  1. notification/handler.py — lazy population logic (lines 367-372)
+  2. notification_service.py — _llm_result / _llm_intent from watch → n_object
+  3. End-to-end: tokens render in notification body/title
+"""
+import pytest
+from unittest.mock import MagicMock, patch
+from changedetectionio.notification_service import NotificationContextData
+
+
+def _make_n_object(**extra):
+    n = NotificationContextData()
+    n.update({
+        'notification_body': '',
+        'notification_title': '',
+        'notification_format': 'text',
+        'notification_urls': ['json://localhost/'],
+        'uuid': 'test-uuid',
+        'watch_uuid': 'test-uuid',
+        'watch_url': 'https://example.com',
+        'current_snapshot': 'current text',
+        'prev_snapshot': 'previous text',
+    })
+    n.update(extra)
+    return n
+
+
+# ---------------------------------------------------------------------------
+# handler.py — lazy population of llm_summary / llm_intent
+# ---------------------------------------------------------------------------
+
+class TestHandlerLlmTokenPopulation:
+    """
+    The notification handler checks if llm_summary or llm_intent tokens appear
+    in the notification text and lazily populates them from _llm_result.
+    """
+
+    def _run_handler_llm_section(self, n_object):
+        """
+        Replicate the exact logic from notification/handler.py lines 367-372.
+        This is tested directly to validate the handler's token population.
+        """
+        scan_text = n_object.get('notification_body', '') + n_object.get('notification_title', '')
+        if 'llm_summary' in scan_text or 'llm_intent' in scan_text:
+            llm_result = n_object.get('_llm_result') or {}
+            n_object['llm_summary'] = llm_result.get('summary', '')
+            n_object['llm_intent'] = n_object.get('_llm_intent', '')
+        return n_object
+
+    def test_llm_summary_populated_when_token_in_body(self):
+        n = _make_n_object(
+            notification_body='Change detected! Summary: {{ llm_summary }}',
+            _llm_result={'important': True, 'summary': 'Price dropped from $500 to $400'},
+            _llm_intent='flag price drops',
+        )
+        result = self._run_handler_llm_section(n)
+        assert result['llm_summary'] == 'Price dropped from $500 to $400'
+
+    def test_llm_intent_populated_when_token_in_body(self):
+        n = _make_n_object(
+            notification_body='Intent was: {{ llm_intent }}',
+            _llm_result={'important': True, 'summary': 'some change'},
+            _llm_intent='flag price drops',
+        )
+        result = self._run_handler_llm_section(n)
+        assert result['llm_intent'] == 'flag price drops'
+
+    def test_llm_summary_in_title(self):
+        n = _make_n_object(
+            notification_title='[CD] {{ llm_summary }}',
+            notification_body='some body',
+            _llm_result={'important': True, 'summary': 'New job posted'},
+            _llm_intent='new jobs',
+        )
+        result = self._run_handler_llm_section(n)
+        assert result['llm_summary'] == 'New job posted'
+
+    def test_tokens_not_populated_when_absent_from_template(self):
+        """Don't bother populating when tokens aren't used — avoid needless LLM calls."""
+        n = _make_n_object(
+            notification_body='Change at {{ watch_url }}',
+            notification_title='CD Alert',
+            _llm_result={'important': True, 'summary': 'should not appear'},
+            _llm_intent='test',
+        )
+        result = self._run_handler_llm_section(n)
+        # llm_summary and llm_intent should remain at their default None values
+        assert result.get('llm_summary') is None
+        assert result.get('llm_intent') is None
+
+    def test_empty_summary_when_no_llm_result(self):
+        n = _make_n_object(
+            notification_body='Summary: {{ llm_summary }}',
+            _llm_result=None,
+            _llm_intent='',
+        )
+        result = self._run_handler_llm_section(n)
+        assert result['llm_summary'] == ''
+
+    def test_empty_intent_when_not_set(self):
+        n = _make_n_object(
+            notification_body='Intent: {{ llm_intent }}',
+            _llm_result={'important': False, 'summary': ''},
+        )
+        result = self._run_handler_llm_section(n)
+        assert result['llm_intent'] == ''
+
+    def test_summary_from_unimportant_result(self):
+        """Even when important=False the summary explains why — useful for debugging."""
+        n = _make_n_object(
+            notification_body='Summary: {{ llm_summary }}',
+            _llm_result={'important': False, 'summary': 'Only a copyright year changed'},
+            _llm_intent='flag price drops',
+        )
+        result = self._run_handler_llm_section(n)
+        assert result['llm_summary'] == 'Only a copyright year changed'
+
+
+# ---------------------------------------------------------------------------
+# notification_service.py — _llm_result / _llm_intent wired from watch
+# ---------------------------------------------------------------------------
+
+class TestNotificationServiceLlmAttachment:
+    """
+    send_content_changed_notification() reads _llm_result and _llm_intent
+    from the watch object and attaches them to n_object so the handler can render tokens.
+    """
+
+    def _make_watch(self, llm_result=None, llm_intent=''):
+        watch = MagicMock()
+        watch.get.side_effect = lambda key, default=None: {
+            '_llm_result': llm_result,
+            '_llm_intent': llm_intent,
+            'notification_urls': ['json://localhost/'],
+            'notification_title': '',
+            'notification_body': '',
+            'notification_format': 'text',
+            'notification_muted': False,
+            'notification_alert_count': 0,
+        }.get(key, default)
+        watch.history = {'1000': 'snap1', '2000': 'snap2'}
+        watch.get_history_snapshot = MagicMock(return_value='snapshot text')
+        watch.extra_notification_token_values = MagicMock(return_value={})
+        return watch
+
+    def test_llm_result_attached_to_n_object(self):
+        """_llm_result from watch ends up in n_object for the notification handler."""
+        from changedetectionio.notification_service import NotificationService
+
+        llm_result = {'important': True, 'summary': 'Price dropped'}
+        watch = self._make_watch(llm_result=llm_result, llm_intent='flag price drops')
+
+        datastore = MagicMock()
+        datastore.data = {
+            'settings': {
+                'application': {
+                    'active_base_url': 'http://localhost',
+                    'notification_urls': [],
+                    'notification_title': '',
+                    'notification_body': '',
+                    'notification_format': 'text',
+                    'notification_muted': False,
+                }
+            },
+            'watching': {'test-uuid': watch},
+        }
+        datastore.get_all_tags_for_watch = MagicMock(return_value={})
+
+        captured = {}
+
+        def fake_queue_notification(n_object, watch, **kwargs):
+            captured['n_object'] = dict(n_object)
+
+        svc = NotificationService(datastore, MagicMock())
+        svc.queue_notification_for_watch = fake_queue_notification
+
+        svc.send_content_changed_notification('test-uuid')
+
+        assert '_llm_result' in captured['n_object']
+        assert captured['n_object']['_llm_result'] == llm_result
+
+    def test_llm_intent_attached_to_n_object(self):
+        """_llm_intent from watch ends up in n_object."""
+        from changedetectionio.notification_service import NotificationService
+
+        watch = self._make_watch(
+            llm_result={'important': True, 'summary': 'test'},
+            llm_intent='flag price drops',
+        )
+
+        datastore = MagicMock()
+        datastore.data = {
+            'settings': {
+                'application': {
+                    'active_base_url': 'http://localhost',
+                    'notification_urls': [],
+                    'notification_title': '',
+                    'notification_body': '',
+                    'notification_format': 'text',
+                    'notification_muted': False,
+                }
+            },
+            'watching': {'test-uuid': watch},
+        }
+        datastore.get_all_tags_for_watch = MagicMock(return_value={})
+
+        captured = {}
+
+        def fake_queue_notification(n_object, watch, **kwargs):
+            captured['n_object'] = dict(n_object)
+
+        svc = NotificationService(datastore, MagicMock())
+        svc.queue_notification_for_watch = fake_queue_notification
+
+        svc.send_content_changed_notification('test-uuid')
+
+        assert captured['n_object']['_llm_intent'] == 'flag price drops'
+
+    def test_null_llm_result_when_no_evaluation(self):
+        """When LLM wasn't evaluated, _llm_result is None — tokens render as empty."""
+        from changedetectionio.notification_service import NotificationService
+
+        watch = self._make_watch(llm_result=None, llm_intent='')
+
+        datastore = MagicMock()
+        datastore.data = {
+            'settings': {
+                'application': {
+                    'active_base_url': 'http://localhost',
+                    'notification_urls': [],
+                    'notification_title': '',
+                    'notification_body': '',
+                    'notification_format': 'text',
+                    'notification_muted': False,
+                }
+            },
+            'watching': {'test-uuid': watch},
+        }
+        datastore.get_all_tags_for_watch = MagicMock(return_value={})
+
+        captured = {}
+
+        def fake_queue_notification(n_object, watch, **kwargs):
+            captured['n_object'] = dict(n_object)
+
+        svc = NotificationService(datastore, MagicMock())
+        svc.queue_notification_for_watch = fake_queue_notification
+
+        svc.send_content_changed_notification('test-uuid')
+
+        assert captured['n_object']['_llm_result'] is None
+        assert captured['n_object']['_llm_intent'] == ''
+
+
+# ---------------------------------------------------------------------------
+# End-to-end: Jinja2 template rendering with llm_summary / llm_intent
+# ---------------------------------------------------------------------------
+
+class TestLlmTokenEndToEnd:
+    """
+    Verify that the tokens render correctly through the Jinja2 engine
+    used for notification bodies.
+    """
+
+    def test_llm_summary_renders_in_template(self):
+        from changedetectionio.jinja2_custom import render as jinja_render
+        from changedetectionio.notification_service import NotificationContextData
+
+        n = NotificationContextData()
+        n['llm_summary'] = 'Price dropped from $500 to $400'
+        n['watch_url'] = 'https://example.com'
+
+        rendered = jinja_render(
+            template_str='Change at {{watch_url}}: {{llm_summary}}',
+            **n
+        )
+        assert 'Price dropped from $500 to $400' in rendered
+        assert 'https://example.com' in rendered
+
+    def test_llm_intent_renders_in_template(self):
+        from changedetectionio.jinja2_custom import render as jinja_render
+        from changedetectionio.notification_service import NotificationContextData
+
+        n = NotificationContextData()
+        n['llm_intent'] = 'flag price drops below $300'
+        n['watch_url'] = 'https://example.com'
+
+        rendered = jinja_render(
+            template_str='Intent was: {{llm_intent}}',
+            **n
+        )
+        assert 'flag price drops below $300' in rendered
+
+    def test_llm_summary_empty_string_when_none(self):
+        from changedetectionio.jinja2_custom import render as jinja_render
+        from changedetectionio.notification_service import NotificationContextData
+
+        n = NotificationContextData()
+        # llm_summary defaults to None in NotificationContextData
+        rendered = jinja_render(
+            template_str='Summary: {{llm_summary or ""}}',
+            **n
+        )
+        assert rendered == 'Summary: '
+
+    def test_both_tokens_in_same_template(self):
+        from changedetectionio.jinja2_custom import render as jinja_render
+        from changedetectionio.notification_service import NotificationContextData
+
+        n = NotificationContextData()
+        n['llm_summary'] = 'New senior role posted'
+        n['llm_intent'] = 'alert on new engineering jobs'
+        n['watch_url'] = 'https://jobs.example.com'
+
+        rendered = jinja_render(
+            template_str='[{{llm_intent}}] {{llm_summary}} — {{watch_url}}',
+            **n
+        )
+        assert 'alert on new engineering jobs' in rendered
+        assert 'New senior role posted' in rendered
+        assert 'https://jobs.example.com' in rendered

changedetectionio/tests/llm/test_prompt_builder.py

@@ -0,0 +1,137 @@
+"""
+Unit tests for changedetectionio/llm/prompt_builder.py
+
+All functions are pure — no external dependencies needed.
+"""
+import pytest
+from changedetectionio.llm.prompt_builder import (
+    build_eval_prompt,
+    build_eval_system_prompt,
+    build_setup_prompt,
+    build_setup_system_prompt,
+    SNAPSHOT_CONTEXT_CHARS,
+)
+
+
+class TestBuildEvalPrompt:
+    def test_contains_intent(self):
+        prompt = build_eval_prompt(intent='Alert on price drops', diff='- $500\n+ $400')
+        assert 'Alert on price drops' in prompt
+
+    def test_contains_diff(self):
+        prompt = build_eval_prompt(intent='price', diff='- $500\n+ $400')
+        assert '- $500' in prompt
+        assert '+ $400' in prompt
+
+    def test_optional_url_included_when_provided(self):
+        prompt = build_eval_prompt(
+            intent='price',
+            diff='some diff',
+            url='https://example.com/product',
+        )
+        assert 'https://example.com/product' in prompt
+
+    def test_url_absent_when_not_provided(self):
+        prompt = build_eval_prompt(intent='price', diff='diff')
+        assert 'URL:' not in prompt
+
+    def test_optional_title_included_when_provided(self):
+        prompt = build_eval_prompt(
+            intent='price',
+            diff='diff',
+            title='Example Product Page',
+        )
+        assert 'Example Product Page' in prompt
+
+    def test_snapshot_context_included(self):
+        snapshot = 'Current price: $400. Stock: in stock. Description: widget.'
+        prompt = build_eval_prompt(
+            intent='price',
+            diff='- $500\n+ $400',
+            current_snapshot=snapshot,
+        )
+        # Snapshot excerpt should appear somewhere in the prompt
+        assert 'Current price' in prompt or '$400' in prompt
+
+    def test_large_snapshot_trimmed_to_budget(self):
+        # Snapshot larger than SNAPSHOT_CONTEXT_CHARS should be trimmed
+        large_snapshot = 'irrelevant content line\n' * 2000
+        prompt = build_eval_prompt(
+            intent='price drop',
+            diff='changed',
+            current_snapshot=large_snapshot,
+        )
+        # Prompt should not be astronomically large
+        assert len(prompt) < len(large_snapshot)
+
+    def test_empty_snapshot_skipped(self):
+        prompt_with = build_eval_prompt(intent='x', diff='d', current_snapshot='some text')
+        prompt_without = build_eval_prompt(intent='x', diff='d', current_snapshot='')
+        # Without snapshot should be shorter
+        assert len(prompt_without) < len(prompt_with)
+
+
+class TestBuildEvalSystemPrompt:
+    def test_returns_string(self):
+        result = build_eval_system_prompt()
+        assert isinstance(result, str)
+        assert len(result) > 0
+
+    def test_instructs_json_only_output(self):
+        result = build_eval_system_prompt()
+        assert 'JSON' in result or 'json' in result.lower()
+
+    def test_defines_important_field(self):
+        result = build_eval_system_prompt()
+        assert 'important' in result
+
+    def test_defines_summary_field(self):
+        result = build_eval_system_prompt()
+        assert 'summary' in result
+
+
+class TestBuildSetupPrompt:
+    def test_contains_intent(self):
+        prompt = build_setup_prompt(
+            intent='monitor footer changes',
+            snapshot_text='<footer>Copyright 2024</footer>',
+        )
+        assert 'monitor footer changes' in prompt
+
+    def test_contains_url_when_provided(self):
+        prompt = build_setup_prompt(
+            intent='price',
+            snapshot_text='price: $10',
+            url='https://shop.example.com',
+        )
+        assert 'https://shop.example.com' in prompt
+
+    def test_url_absent_when_not_provided(self):
+        prompt = build_setup_prompt(intent='price', snapshot_text='text')
+        assert 'URL:' not in prompt
+
+    def test_large_snapshot_trimmed(self):
+        big_snapshot = 'unrelated junk line\n' * 500
+        prompt = build_setup_prompt(
+            intent='monitor price section',
+            snapshot_text=big_snapshot,
+        )
+        assert len(prompt) < len(big_snapshot)
+
+
+class TestBuildSetupSystemPrompt:
+    def test_returns_string(self):
+        result = build_setup_system_prompt()
+        assert isinstance(result, str)
+
+    def test_forbids_positional_selectors(self):
+        result = build_setup_system_prompt()
+        assert 'nth-child' in result or 'positional' in result
+
+    def test_defines_needs_prefilter_field(self):
+        result = build_setup_system_prompt()
+        assert 'needs_prefilter' in result
+
+    def test_defines_selector_field(self):
+        result = build_setup_system_prompt()
+        assert 'selector' in result

changedetectionio/tests/llm/test_response_parser.py

@@ -0,0 +1,146 @@
+"""
+Unit tests for changedetectionio/llm/response_parser.py
+
+All functions are pure — no external dependencies needed.
+"""
+import pytest
+from changedetectionio.llm.response_parser import (
+    _extract_json,
+    parse_eval_response,
+    parse_setup_response,
+)
+
+
+class TestExtractJson:
+    def test_plain_json_passes_through(self):
+        raw = '{"important": true, "summary": "price dropped"}'
+        assert _extract_json(raw) == raw
+
+    def test_strips_json_code_fence(self):
+        raw = '```json\n{"important": false, "summary": "no match"}\n```'
+        result = _extract_json(raw)
+        assert result.startswith('{')
+        assert '"important"' in result
+
+    def test_strips_plain_code_fence(self):
+        raw = '```\n{"important": true, "summary": "ok"}\n```'
+        result = _extract_json(raw)
+        assert result.startswith('{')
+
+    def test_extracts_json_from_surrounding_text(self):
+        raw = 'Here is my response: {"important": true, "summary": "match"} — done.'
+        result = _extract_json(raw)
+        assert result == '{"important": true, "summary": "match"}'
+
+    def test_multiline_json(self):
+        raw = '{\n  "important": false,\n  "summary": "nothing relevant"\n}'
+        result = _extract_json(raw)
+        assert '"important"' in result
+
+
+class TestParseEvalResponse:
+    def test_valid_important_true(self):
+        raw = '{"important": true, "summary": "Price dropped from $500 to $400"}'
+        result = parse_eval_response(raw)
+        assert result['important'] is True
+        assert result['summary'] == 'Price dropped from $500 to $400'
+
+    def test_valid_important_false(self):
+        raw = '{"important": false, "summary": "Only a date counter changed"}'
+        result = parse_eval_response(raw)
+        assert result['important'] is False
+        assert 'date counter' in result['summary']
+
+    def test_markdown_fenced_response(self):
+        raw = '```json\n{"important": true, "summary": "New job posted"}\n```'
+        result = parse_eval_response(raw)
+        assert result['important'] is True
+        assert result['summary'] == 'New job posted'
+
+    def test_malformed_json_falls_back_to_safe_default(self):
+        result = parse_eval_response('this is not json at all')
+        assert result['important'] is False
+        assert result['summary'] == ''
+
+    def test_empty_string_falls_back(self):
+        result = parse_eval_response('')
+        assert result['important'] is False
+
+    def test_truthy_integer_coerced_to_bool(self):
+        raw = '{"important": 1, "summary": "yes"}'
+        result = parse_eval_response(raw)
+        assert result['important'] is True
+
+    def test_summary_stripped_of_whitespace(self):
+        raw = '{"important": false, "summary": "  no match  "}'
+        result = parse_eval_response(raw)
+        assert result['summary'] == 'no match'
+
+    def test_missing_summary_defaults_to_empty_string(self):
+        raw = '{"important": true}'
+        result = parse_eval_response(raw)
+        assert result['summary'] == ''
+
+    def test_extra_keys_ignored(self):
+        raw = '{"important": false, "summary": "skip", "confidence": 0.3, "debug": "xyz"}'
+        result = parse_eval_response(raw)
+        assert result['important'] is False
+        assert result['summary'] == 'skip'
+
+
+class TestParseSetupResponse:
+    def test_no_prefilter_needed(self):
+        raw = '{"needs_prefilter": false, "selector": null, "reason": "intent is global"}'
+        result = parse_setup_response(raw)
+        assert result['needs_prefilter'] is False
+        assert result['selector'] is None
+
+    def test_semantic_selector_accepted(self):
+        raw = '{"needs_prefilter": true, "selector": "footer", "reason": "intent references footer"}'
+        result = parse_setup_response(raw)
+        assert result['needs_prefilter'] is True
+        assert result['selector'] == 'footer'
+
+    def test_attribute_selector_accepted(self):
+        raw = '{"needs_prefilter": true, "selector": "[class*=\'price\']", "reason": "pricing section"}'
+        result = parse_setup_response(raw)
+        assert result['needs_prefilter'] is True
+        assert result['selector'] is not None
+
+    def test_nth_child_positional_selector_rejected(self):
+        raw = '{"needs_prefilter": true, "selector": "div:nth-child(3)", "reason": "third div"}'
+        result = parse_setup_response(raw)
+        assert result['selector'] is None
+        assert result['needs_prefilter'] is False
+
+    def test_nth_of_type_positional_selector_rejected(self):
+        raw = '{"needs_prefilter": true, "selector": "p:nth-of-type(2)", "reason": "second p"}'
+        result = parse_setup_response(raw)
+        assert result['selector'] is None
+        assert result['needs_prefilter'] is False
+
+    def test_eq_positional_selector_rejected(self):
+        raw = '{"needs_prefilter": true, "selector": "div:eq(0)", "reason": "first div"}'
+        result = parse_setup_response(raw)
+        assert result['selector'] is None
+
+    def test_xpath_positional_selector_rejected(self):
+        raw = '{"needs_prefilter": true, "selector": "//*[2]", "reason": "second element"}'
+        result = parse_setup_response(raw)
+        assert result['selector'] is None
+
+    def test_selector_forced_to_null_when_needs_prefilter_false(self):
+        # Even if selector is provided alongside needs_prefilter=false, selector is nulled
+        raw = '{"needs_prefilter": false, "selector": "main", "reason": "not needed"}'
+        result = parse_setup_response(raw)
+        assert result['selector'] is None
+
+    def test_malformed_json_safe_defaults(self):
+        result = parse_setup_response('garbage text')
+        assert result['needs_prefilter'] is False
+        assert result['selector'] is None
+        assert result['reason'] == ''
+
+    def test_empty_response_safe_defaults(self):
+        result = parse_setup_response('')
+        assert result['needs_prefilter'] is False

changedetectionio/tests/plugins/test_html_head_extras.py

@@ -0,0 +1,83 @@
+"""Test that plugins can inject HTML into base.html <head> via get_html_head_extras hookimpl."""
+import pytest
+from flask import url_for, Response
+
+from changedetectionio.pluggy_interface import hookimpl, plugin_manager
+
+_MY_JS = "console.log('my_module_content loaded');"
+_MY_CSS = ".my-module-example { color: red; }"
+
+
+class _HeadExtrasPlugin:
+    """Test plugin that injects tags pointing at its own Flask routes."""
+
+    @hookimpl
+    def get_html_head_extras(self):
+        css_url = url_for('test_plugin_my_module_content_css')
+        js_url  = url_for('test_plugin_my_module_content_js')
+        return (
+            f'<link rel="stylesheet" id="test-head-extra-css" href="{css_url}">\n'
+            f'<script id="test-head-extra-js" src="{js_url}" defer></script>'
+        )
+
+
+@pytest.fixture(scope='module')
+def plugin_routes(live_server):
+    """Register plugin asset routes once per module (Flask routes can't be added twice)."""
+    app = live_server.app
+
+    @app.route('/test-plugin/my_module_content/css')
+    def test_plugin_my_module_content_css():
+        return Response(_MY_CSS, mimetype='text/css',
+                        headers={'Cache-Control': 'max-age=3600'})
+
+    @app.route('/test-plugin/my_module_content/js')
+    def test_plugin_my_module_content_js():
+        return Response(_MY_JS, mimetype='application/javascript',
+                        headers={'Cache-Control': 'max-age=3600'})
+
+
+@pytest.fixture
+def head_extras_plugin(plugin_routes):
+    """Register the hookimpl for one test then unregister it — function-scoped for clean isolation."""
+    plugin = _HeadExtrasPlugin()
+    plugin_manager.register(plugin, name="test_head_extras")
+    yield plugin
+    plugin_manager.unregister(name="test_head_extras")
+
+
+def test_plugin_html_injected_into_head(client, live_server, measure_memory_usage, datastore_path, head_extras_plugin):
+    """get_html_head_extras output must appear inside <head> in the rendered page."""
+    res = client.get(url_for("watchlist.index"), follow_redirects=True)
+    assert res.status_code == 200
+    assert b'id="test-head-extra-css"' in res.data, "Plugin <link> tag missing from rendered page"
+    assert b'id="test-head-extra-js"' in res.data,  "Plugin <script> tag missing from rendered page"
+
+    head_end = res.data.find(b'</head>')
+    assert head_end != -1
+    for marker in (b'id="test-head-extra-css"', b'id="test-head-extra-js"'):
+        pos = res.data.find(marker)
+        assert pos != -1 and pos < head_end, f"{marker} must appear before </head>"
+
+
+def test_plugin_js_route_returns_correct_content(client, live_server, measure_memory_usage, datastore_path, plugin_routes):
+    """The plugin-registered JS route must return JS with the right Content-Type."""
+    res = client.get(url_for('test_plugin_my_module_content_js'))
+    assert res.status_code == 200
+    assert 'javascript' in res.content_type
+    assert _MY_JS.encode() in res.data
+
+
+def test_plugin_css_route_returns_correct_content(client, live_server, measure_memory_usage, datastore_path, plugin_routes):
+    """The plugin-registered CSS route must return CSS with the right Content-Type."""
+    res = client.get(url_for('test_plugin_my_module_content_css'))
+    assert res.status_code == 200
+    assert 'css' in res.content_type
+    assert _MY_CSS.encode() in res.data
+
+
+def test_no_extras_without_plugin(client, live_server, measure_memory_usage, datastore_path):
+    """With no hookimpl registered the markers must not appear (isolation check)."""
+    res = client.get(url_for("watchlist.index"), follow_redirects=True)
+    assert b'id="test-head-extra-css"' not in res.data
+    assert b'id="test-head-extra-js"' not in res.data

changedetectionio/tests/smtp/test_notification_smtp.py

@@ -11,10 +11,10 @@ from changedetectionio.tests.util import set_original_response, set_modified_res
     set_longer_modified_response, delete_all_watches
 
 import logging
-
+import os
 
 # NOTE - RELIES ON mailserver as hostname running, see github build recipes
-smtp_test_server = 'mailserver'
+smtp_test_server = os.getenv('SMTP_TEST_MAILSERVER', 'mailserver')
 
 ALL_MARKUP_TOKENS = ''.join(f"TOKEN: '{t}'\n{{{{{t}}}}}\n" for t in NotificationContextData().keys())
 

changedetectionio/tests/test_api.py

@@ -374,6 +374,9 @@ def test_roundtrip_API(client, live_server, measure_memory_usage, datastore_path
     watch['last_changed'] = 454444444444
     watch['date_created'] = 454444444444
 
+    # Exercise the new extract_lines_containing field
+    watch['extract_lines_containing'] = ['celsius', 'temperature']
+
     # HTTP PUT ( UPDATE an existing watch )
     res = client.put(
         url_for("watch", uuid=uuid),
@@ -397,6 +400,9 @@ def test_roundtrip_API(client, live_server, measure_memory_usage, datastore_path
     assert date_created != 454444444444
     assert date_created != "454444444444"
 
+    assert res.json.get('extract_lines_containing') == ['celsius', 'temperature'], \
+        "extract_lines_containing should be persisted and returned via API"
+
 
 def test_access_denied(client, live_server, measure_memory_usage, datastore_path):
     # `config_api_token_enabled` Should be On by default