# Review by Staff Security Engineer (Round 1)

## Staff Security Engineer — Review Complete

**374 tests pass.** All 7 functional requirements implemented across 5 commits (+373 / -1 lines).

### Security Assessment

**No security concerns.** This is a minimal, well-isolated change:

- **No new OAuth scopes** — `reactions:write` already covers `reactions.remove`
- **No user-controlled input** — all emoji names are hardcoded string literals (`"eyes"`, `"white_check_mark"`, `"x"`, `"tada"`). Zero injection risk.
- **Proper failure isolation** — each Slack API call (remove `:eyes:`, add status emoji, add `:tada:`) is in its own independent try/except. The critical completion signal is never gated on cosmetic cleanup.
- **No secrets in diff** — verified clean
- **Audit trail** — all failures logged at debug level with `exc_info=True`

**One observation (non-blocking):** The CLI tests replicate the call sequence pattern rather than exercising the actual `QueueExecutor` code path. This is a pragmatic trade-off given the nested class architecture — acceptable for this scope.

VERDICT: **approve**

FINDINGS:
- [src/colonyos/slack.py]: `remove_reaction()` correctly does not swallow exceptions, delegating error policy to callers. No new attack surface.
- [src/colonyos/cli.py]: Both completion paths use hardcoded emoji literals — no user-controlled input reaches `reactions_remove`. Each API call is independently wrapped in try/except.
- [tests/test_cli.py]: Tests replicate the exact call sequence from `cli.py` rather than testing the actual code path through QueueExecutor. Acceptable trade-off.

SYNTHESIS:
This is a clean, minimal change that adds exactly one new Slack API capability (`reactions_remove`) and wires it into two completion paths with proper failure isolation. No new OAuth scopes required, no user-controlled input reaches the API calls, all failures are logged and isolated, and the critical completion signal is never blocked by the cosmetic cleanup. 374 tests pass with zero regressions. Ship it.

Review artifact saved to `cOS_reviews/reviews/staff_security_engineer/20260331_220000_round1_when_you_finish_working_on_a_feature_requested_f_b962cb06df.md`.
