The Gemini hook was a `python -c "..."` one-liner that (a) depended on a bare
`python` being on PATH (frequently `python`/`py` or absent on Windows) and
(b) embedded backticks + escaped quotes that Windows PowerShell mangles. Same
fix as the Claude/Codebuddy hooks: it now invokes `graphify hook-guard gemini`
via the absolute exe path.
The gemini mode always returns {"decision":"allow"} (never blocks a tool) and
appends the graph nudge as additionalContext only when graph.json exists — the
BeforeTool contract Gemini expects, byte-identical to the old payload. It takes
no stdin, honors GRAPHIFY_OUT, and the matcher stays "read_file|list_directory"
so install/uninstall find and replace old hooks unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
safishamsi
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