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SinghAman21andsafishamsi
0d018b4c6d
The semantic cache keyed entries on sha256(file content + path) alone, with
no component for the extraction prompt that produced them. After an upgrade
that changed the prompt, every unchanged file was a cache hit and replayed
the older prompt's extraction: the run exited 0, cost.json looked cheap, and
the graph silently carried two prompt generations side by side. The reporter
saw 506 of 512 docs replay an older vintage on a rebuild they expected to be
cold; deleting the whole cache was the only workaround.
output, and invalidating them on every release would re-bill extraction for
unchanged files. Fingerprinting the prompt itself keeps both properties:
entries survive releases that don't touch the prompt, and invalidate only
when it actually changed.
Semantic entries now live under cache/semantic/p{fingerprint}/, mirroring the
AST cache's v{version}/ layout. Both extraction paths pass their prompt: the
Python/CLI path from llm.py's _EXTRACTION_SYSTEM (shared by every backend),
and the skill path via a new prompt_file argument in Step B0/B3 naming the
references/extraction-spec.md the subagents were handed. The fingerprint
normalizes line endings so a CRLF checkout isn't mistaken for a new prompt.
Pre-existing entries predate fingerprinting and have unknowable vintage, so
they are still served rather than re-billing a whole corpus on upgrade — but
check_semantic_cache now warns with the count, turning "no signal at all"
into a visible one. merge_existing refuses to fuse such an entry into a
current-vintage write, which would mix two prompts inside one entry and then
attest the result to a prompt that produced half of it.
Old-fingerprint entries are pruned by liveness only, never swept wholesale
the way stale AST versions are: two hosts with different prompts (verbose vs
compact extraction-spec) can share one graphify-out/, and a wholesale sweep
would have each run delete the other's entries and re-bill on every
alternation. prune/clear/cached_files glob recursively so fingerprinted
entries can't become unprunable orphans (the #1527 failure mode).
The two monolith skills (aider, devin) inline their prompt instead of
shipping a spec sidecar and stay on the unfingerprinted path for now.