# Decision Gate: Replace `:eyes:` Emoji with Completion Emoji on Pipeline Finish

**Branch**: `colonyos/when_you_finish_working_on_a_feature_requested_f_b962cb06df`
**PRD**: `cOS_prds/20260331_200151_prd_you_are_a_code_assistant_working_on_behalf_of_the_engineering_team_the_following.md`
**Date**: 2026-03-31

## Persona Verdicts

| Persona | Verdict | Critical | High | Medium | Low |
|---|---|---|---|---|---|
| Andrej Karpathy (×2) | APPROVE | 0 | 0 | 0 | 0 |
| Linus Torvalds (×2) | APPROVE | 0 | 0 | 0 | 0 |
| Principal Systems Engineer (×2) | APPROVE | 0 | 0 | 0 | 0 |
| Staff Security Engineer (×3) | APPROVE | 0 | 0 | 0 | 0 |

**Tally**: 9/9 APPROVE, 0 REQUEST CHANGES

## PRD Requirements Checklist

- [x] FR-1: `reactions_remove` added to SlackClient Protocol
- [x] FR-2: `remove_reaction()` helper added to `slack.py`
- [x] FR-3: `:eyes:` removed on both completion paths (main + fix)
- [x] FR-4: try/except with `logger.debug()` on removal
- [x] FR-5: Removal executes before addition of completion emoji
- [x] FR-6: `:tada:` added alongside `:white_check_mark:` on success only
- [x] FR-7: All new functionality has corresponding unit tests

## Code Review Summary

- **Production changes**: 19 lines in `cli.py`, 18 lines in `slack.py` — minimal and focused
- **Test coverage**: 168 lines of new tests covering success, failure, ordering, and error isolation
- **Pattern adherence**: New code exactly mirrors existing try/except + `logger.debug()` pattern
- **Security**: No new attack surface, hardcoded emoji literals, no new OAuth scopes
- **All tests pass**: Full suite (374+ tests) green

```
VERDICT: GO
```

### Rationale
All 9 persona reviews across 4 reviewers unanimously approve with zero findings at any severity level. The implementation is a clean, minimal 19-line production change that satisfies all 7 functional requirements from the PRD. Error isolation is correct — each Slack API call has its own independent try/except, so a failed `:eyes:` removal never blocks the completion emoji.

### Unresolved Issues
None.

### Recommendation
Merge as-is. The implementation is production-ready with comprehensive test coverage and zero reviewer concerns.
