Post-commit hook that writes logs to .agent-logs/ "as if" an AI agent had written the code. There is no good reason to use this, but you can read the story of why it exists at https://danq.me/ai-agent-logging/

post-commit.sh

#!/bin/sh

################################################################################
# Half-joking post-commit hook that adds an .agent-log/ entry to each commit,  #
# identifying the AI agent that modified the code... even if an AI agent was   #
# not actually used!                                                           #
#                                                                              #
# Place in .git/hooks/post-commit. Probably do not check-in to your repo!      #
#                                                                              #
# More information:                                                            #
# https://danq.me/ai-agent-logging/                                            #
################################################################################

# Avoid infinite recursion:
if [ "$GIT_AGENT_POST_COMMIT_AMEND" = "1" ]; then
  exit 0
fi

# Determine the repository root and agent logs directory:
REPO_ROOT="$(git rev-parse --show-toplevel 2>/dev/null)"
LOG_DIR="$REPO_ROOT/.agent-logs"

# Use the current branch name as the log filename (fallback to 'HEAD' if detached)
BRANCH_NAME="$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo HEAD)"
LOG_FILE="$LOG_DIR/$BRANCH_NAME"

# Get the first line (subject) of the last commit message
FIRST_LINE="$(git log -1 --pretty=%s)"
if [ -n "$FIRST_LINE" ]; then
  # Ensure the log directory exists:
  mkdir -p "$LOG_DIR"

  # List of all possible AI agents to 'simulate':
  AI_AGENT_LIST="agent stardust frantic"

  # Choose one at random:
  set -- $AI_AGENT_LIST
  WORD_COUNT=$#
  INDEX=$((RANDOM % WORD_COUNT + 1))
  i=1
  for w in "$@"; do
    if [ "$i" -eq "$INDEX" ]; then
      PREFIX="$w"
      break
    fi
    i=$((i + 1))
  done

  # Log what the AI agent "did" in this format:
  echo "[$PREFIX] $FIRST_LINE" >> "$LOG_FILE"

  # Stage the updated log file and amend the just-created commit with it:
  # (we set GIT_AGENT_POST_COMMIT_AMEND=1 to avoid infinite recursion)
  GIT_AGENT_POST_COMMIT_AMEND=1 git add "$LOG_FILE" && \
    GIT_AGENT_POST_COMMIT_AMEND=1 git commit --amend --no-edit
fi

exit 0