# Review by Andrej Karpathy (Round 3)

## Review Complete — Andrej Karpathy (Round 2)

**VERDICT: approve** ✅

### Key findings:

1. **All 10 functional requirements implemented.** Daily thread creation, hour-aware rotation, structured summary, critical alert routing, state persistence, restart recovery, backward compatibility — all covered.

2. **The routing architecture is minimal and correct.** The entire feature is two surgical changes: a `critical` kwarg on `_post_slack_message` (4-line routing conditional) and a daily-thread branch in `_ensure_notification_thread`. No shotgun refactor needed.

3. **`format_daily_summary` is pure and deterministic** — zero LLM cost as promised. This is the right V1: you can layer LLM summarization on top later without touching any plumbing.

4. **`_post_slack_message` refactoring is a net win** — consolidates inline token lookup through `_get_notification_client()`, reducing the token-handling surface to a single acquisition point.

5. **Budget exhaustion alert fix from round 1 is correctly applied** — `critical=True` ensures operators can't miss that the daemon has stopped.

6. **53 new tests pass**, covering lifecycle, routing, summary generation, integration, restart recovery, and backward compatibility. The integration test correctly asserts the "1 top-level message, N threaded replies" invariant.

**Minor non-blocking notes:** Summary filters by `added_at` (not completion date), user-controlled fields flow into mrkdwn unsanitized (pre-existing pattern), and `_post_circuit_breaker_cooldown_notice` is marked `critical=True` (minor spec deviation, defensively correct).

Review artifact written to `cOS_reviews/reviews/andrej_karpathy/20260401_round2_you_are_sending_too_many_slack_messages_to_the_m_1b324759d9.md`.