# Review by Andrej Karpathy (Round 3)

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## Review Complete

Here's my assessment as Andrej Karpathy:

**All 456 tests pass.** All 21 functional requirements from the PRD are implemented, all task groups are complete, and no placeholder code remains.

### Key Strengths (AI Engineering Perspective)
- **Prompts as programs**: The `thread_fix.md` instruction template is properly structured with clear placeholders, role anchoring, and separation of concerns — this is how you treat prompts in production
- **Sanitization pipeline**: The two-pass `strip_slack_links()` → `sanitize_untrusted_content()` composition correctly prevents the `<URL|malicious_xml>` bypass vector
- **Context scope discipline**: Using only latest message + original prompt (not full thread history) is the right default — avoids context dilution and unnecessary token cost
- **HEAD SHA verification**: Real defense against force-push tampering between fix rounds, with correct SHA propagation to parent items for multi-round support

### Minor Findings (non-blocking)
- Verify phase uses an inline prompt string instead of an instruction template (inconsistent)
- Deliver prompt extended via string concatenation rather than a dedicated parameter
- Original prompt gets double-wrapped in `<slack_message>` delimiters (cosmetic)
- Linear queue scan in `should_process_thread_fix()` — fine for MVP, index later

VERDICT: **approve**

SYNTHESIS: This is a well-executed implementation. The important things are done right — prompt design, sanitization, context scoping, and security defenses. The minor findings are all "make it better" improvements, not bugs. Approved.