ai-commit-hook/commit-msg at main · samosad/ai-commit-hook · GitHub

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#!/usr/bin/env bash
#
# commit-msg hook — Ensures every commit looks AI-assisted.
# Because if it's not in the metadata, did AI even help?
#
# Part of: https://github.com/samosad/ai-commit-hook
# License: MIT

set -euo pipefail

COMMIT_MSG_FILE="$1"

CO_AUTHOR="Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>"

# Read the current commit message
commit_msg=$(cat "$COMMIT_MSG_FILE")

# Don't add the footer if it's already there (e.g. amended commits)
if grep -qF "$CO_AUTHOR""$COMMIT_MSG_FILE"2>/dev/null;then
exit 0
fi

# Strip any trailing blank lines from the message, then append footer
# This ensures exactly one blank line before the Co-authored-by
printf'%s\n\n%s\n'"$commit_msg""$CO_AUTHOR">"$COMMIT_MSG_FILE"