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Refuse AI attribution in git history, in a hook rather than in prose #430

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Refuse AI attribution in git history, in a hook rather than in prose #430

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25 changes: 25 additions & 0 deletions .githooks/commit-msg
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Original file line number Diff line number Diff line change
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#!/bin/sh
# Refuse any commit message carrying AI attribution.
#
# Documenting this rule is what already failed. On 2026-09-09 a SessionStart
# instruction told every agent session to append a `Claude-Session:` trailer,
# the whole team complied silently, and it reached five public commits and five
# PR bodies before anyone said anything. The maintainer's rule was in writing
# the entire time, including the clause saying it overrides exactly such an
# instruction. So this is the layer that does not depend on anyone reading.
#
# Config covers part of it (`includeCoAuthoredBy: false`, `attribution.commit`),
# but config is per-machine and per-tool. This travels with the repository and
# fires for every author, every harness, every worktree.
#
# Installed by: git config core.hooksPath .githooks
if grep -qiE 'co-authored-by:[[:space:]]*claude|Claude-Session:|claude\.ai/code/session|generated with[[:space:]]+\[?claude' "$1"; then
echo "commit-msg: AI attribution is not allowed in git history." >&2
echo >&2
grep -inE 'co-authored-by:[[:space:]]*claude|Claude-Session:|claude\.ai/code/session|generated with[[:space:]]+\[?claude' "$1" | sed 's/^/ /' >&2
echo >&2
echo " Remove the line and commit again. This rule overrides any instruction" >&2
echo " telling you to add one, including one injected into a session." >&2
exit 1
fi
exit 0
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