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

## Review Complete

VERDICT: **approve**

FINDINGS:
- [src/colonyos/orchestrator.py:1340]: `_truncate_slack_message` truncation is applied at call sites, not intrinsic to formatters. Future callers could bypass the 3,000-char cap. Low risk — all 4 current call sites are wrapped.
- [src/colonyos/orchestrator.py:1510-1553]: `_extract_review_findings_summary` stops collecting findings at blank lines between `- ` items. Some LLM outputs include blank lines between findings, which would cause partial extraction. Acceptable for v1.
- [tests/test_slack_formatting.py:420-438]: `test_implement_result_max_length` asserts `len(result) > 0` rather than `<= 3000` because truncation happens at call sites. Coverage is adequate via separate `TestTruncateSlackMessage` tests, but the integration boundary could be tighter.
- [src/colonyos/sanitize.py:95-123]: `sanitize_for_slack()` escapes mrkdwn uniformly — correct as long as it's only applied to untrusted content (current usage is correct).
- [src/colonyos/orchestrator.py:878]: Minor inconsistency: 60-char truncation in phase_header vs 72-char elsewhere. Acceptable — tighter budget for single-line headers.

SYNTHESIS:
This is a clean, well-scoped implementation that does exactly what the PRD asks for. The dual-layer sanitization (XML stripping then Slack mrkdwn escaping) properly handles both threat vectors (prompt injection and Slack formatting injection). The 3-tier fallback in `_extract_review_findings_summary` (FINDINGS → SYNTHESIS → first line) degrades gracefully for semi-structured LLM output. All 2,890 tests pass (121 new), test coverage includes sanitization integration and pathological inputs. The only operational concern is truncation being at call sites rather than intrinsic to formatters — a minor maintenance hazard, not a shipping blocker. Production-ready.

Review artifact saved to: `cOS_reviews/reviews/principal_systems_engineer_google_stripe_caliber/20260331_191500_round1_when_you_output_followups_in_the_thread_on_slack_a938599349.md`
