# Review by Staff Security Engineer (Round 2)

## Review Complete — Staff Security Engineer

VERDICT: approve

FINDINGS:
- [src/colonyos/daemon.py:630-639]: Budget exhaustion alerts (80% and 100%) route to daily thread without `critical=True`. The 100% alert arguably warrants top-level visibility — operators could miss that the daemon has stopped executing. Low risk, recommend follow-up.
- [src/colonyos/slack.py:format_daily_summary]: User-controlled fields (summary, error, source_value) interpolated into Slack mrkdwn without sanitization. Pre-existing pattern across all `slack.py` formatters, not introduced here. Low risk given authenticated data sources.
- [src/colonyos/daemon.py:283-289]: Old `daily_thread_ts` overwritten on rotation without logging the previous value. Minor audit trail gap for incident forensics.
- [src/colonyos/daemon.py:1780]: Token handling consolidated from inline `os.environ.get` + `WebClient()` to `_get_notification_client()` — net positive, reducing token surface to a single acquisition point.
- [src/colonyos/config.py:444-470]: Config validation is thorough — invalid mode raises, invalid hour raises, invalid timezone falls back safely. No injection vectors.

SYNTHESIS:
This implementation is solid from a security perspective. The most critical invariant — safety alerts (auto-pause, circuit breaker, pre-execution blocker) never get buried in a thread — is correctly enforced across all 4 paths with explicit `critical=True` flags, verified by dedicated tests. The `_post_slack_message` refactoring reduces the token-handling surface from 2 independent code paths to 1 via `_get_notification_client()`. State persistence uses exclusively daemon-controlled data (Slack API responses, `datetime.now()`), config validation is defensive with safe fallbacks, and error handling ensures Slack failures never block the daemon's core loop. The three advisory findings (budget alert routing, mrkdwn sanitization gap, rotation audit trail) are all low-risk items appropriate for follow-up iterations. All 52 new tests pass. Approved.
