babysit-pr-stop

Stop the /babysit-pr watcher for one PR. This is the clean-cancel companion to /babysit-pr — it does not merge, fix, or touch the PR itself; it only tears down the watcher Monitor and its state.

Stopping is exact and idempotent: it records the stop request, stops the recorded Monitor task with TaskStop, and leaves the watcher's T0 short-circuit armed for any tick that was already emitted. Running it on a PR with no active watcher is a safe no-op.

Resolve the state helper

Same three-candidate lookup as /babysit-pr (fixpr/SKILL.md pattern):

resolve_script() {
  local name="$1" candidate
  for candidate in \
    "$HOME/.claude/skills-worktree/.claude/scripts/$name" \
    "$HOME/.claude/scripts/$name" \
    ".claude/scripts/$name"; do
    if [[ -x "$candidate" ]]; then echo "$candidate"; return 0; fi
  done
  return 1
}
SESSION_STATE_SH=$(resolve_script session-state.sh) || { echo "ERROR: session-state.sh not found" >&2; exit 1; }

Steps

1. Parse the PR number

The first bare integer in $ARGUMENTS is <PR>. If none is given, stop: "Usage: /babysit-pr-stop ".

2. Check for an active watcher

Distinguish "no watcher" from "the state helper failed" — do not collapse every error into a clean no-op (that would silently skip a real stop request):

ACTIVE=$("$SESSION_STATE_SH" --get ".prs[\"$PR\"].babysit.active"); GET_RC=$?
case "$GET_RC" in
  0) ;;                                   # value read OK (may be true/false/null)
  3) echo "No babysit state on file — nothing to stop."; exit 0 ;;  # state file missing
  *) echo "ERROR: session-state.sh --get failed (exit $GET_RC) — not assuming inactive; investigate before retrying." >&2; exit "$GET_RC" ;;
esac
if [[ "$ACTIVE" != "true" ]]; then       # only a genuine null/false means inactive
  echo "No active babysit watcher for PR #$PR — nothing to stop."
  exit 0
fi

Exit 3 (state file absent) is the legitimate "nothing to watch" case. Any other non-zero exit is a real helper/parse failure — surface it and stop rather than masking it as inactive.