# Review by Andrej Karpathy (Round 5)

---

## Andrej Karpathy — Round 4 Review

**137 tests pass.** All 5 functional requirements implemented. 11 commits, +1,371 / -24 lines.

Both non-blocking findings from round 3 addressed:
1. **Debug logging** for malformed cost/duration — bare `pass` replaced with `logger.debug`, verified by test
2. **Tighter blank-line handling** — findings collection now fails-closed once `max_findings` reached, verified by test

No new findings.

VERDICT: **approve**

FINDINGS:
- (none)

SYNTHESIS:
This is a well-executed feature that follows the cardinal rule of LLM application engineering: apply deterministic post-processing to semi-structured model output, degrade gracefully when structure is absent. The three-tier fallback in `_extract_review_findings_summary()` handles real-world variance of stochastic outputs without overengineering. Zero new LLM calls — all signal extracted from existing artifacts via simple string operations. Sanitization is applied at the content boundary (where untrusted data enters) with correct ordering (XML strip first, then Slack-specific escaping). The 137-test suite provides comprehensive coverage including integration tests through the full formatting chain. All four rounds of review findings have been addressed. Ship it.

Review artifact saved to `cOS_reviews/reviews/andrej_karpathy/20260331_210000_round4_when_you_output_followups_in_the_thread_on_slack_a938599349.md`.
