# Review by Principal Systems Engineer (Google/Stripe caliber) (Round 1)

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## Review Complete

**VERDICT: approve**

**FINDINGS:**
- **[src/colonyos/slack_queue.py:271-311]**: Transient and non-transient error handlers are structurally duplicated (~14 lines each). Extractable to a shared `_handle_triage_failure()` helper. Minor DRY issue, acceptable for V1 clarity.
- **[src/colonyos/slack_queue.py:271]**: Transient exception tuple `(TimeoutError, ConnectionError, OSError)` may not catch HTTP-client-specific timeout exceptions (e.g., `httpx.ReadTimeout`). The fallback is fail-safe (marks `triage-error`, posts warning), but retry may fire less often than expected. Worth a follow-up to inspect `triage_message()`'s actual exception surface.
- **[src/colonyos/slack_queue.py:203]**: TOCTOU rate-limit gap correctly closed — `increment_hourly_count` and `check_rate_limit` are now atomic under the same `state_lock` acquisition.
- **[src/colonyos/daemon.py:1688-1690]**: Good operational comment explaining the `agent_lock` pass-through rationale.
- **[tests/test_slack_queue.py]**: 12 new tests with clear docstrings covering all FRs; integration test uses proper `Queue.join()` synchronization. All 20 tests pass.

**SYNTHESIS:**
This is a clean, surgical change that does exactly what the PRD asks — nothing more, nothing less. The core insight (triage is stateless → no lock needed) is correct and well-validated. The retry logic, error marking, and rate-limit hardening are additive safety improvements that don't complicate the happy path. The one area for follow-up is the transient exception tuple, which may miss HTTP-client-specific exceptions — but the failure mode is "skip retry" not "drop message," which is the right fail-safe direction. The diff is tightly scoped (66 lines in production code, ~500 in tests), the commit history tells a clear story (one per task group), and there are zero regressions. Ship it.