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---
name: "stage-coach"
description: "Consume CocoSentinel per-stage external coach requests and produce stage quality scores."
version: "1.0.0"
author: "CocoPlus"
tags:
- cocoplus
- cocosentinel
- quality
---
Use this skill for queued per-stage coach reviews from `.cocoplus/sentinel/coach-requests.jsonl`.
## Objective
Evaluate completed CocoFlow stages with a separate coach model so generator and critic remain structurally separated.
## Workflow
1. Verify `.cocoplus/` exists.
2. Read `.cocoplus/sentinel/coach-requests.jsonl`.
3. For each queued request, collect:
- stage role and task brief from `.cocoplus/flow.json`
- declared `artifacts.reads` and `artifacts.writes`
- produced artifact paths under `.cocoplus/flow/artifacts/<run-id>/`
- downstream missing artifact status
4. Verify `coach_model` differs from the executor model. If not, write `.cocoplus/sentinel/known-gaps.jsonl` and skip the request.
5. Run an external coach evaluation using the configured coach model.
6. Write `.cocoplus/sentinel/stage-quality.jsonl`:
```json
{
"ts": "...",
"stage_id": "function-designer",
"score": 7,
"reasoning": "Specific evidence-backed rationale.",
"attributed_to": "function-designer",
"coach_model": "haiku"
}
```
7. Mark consumed requests as processed by writing `.cocoplus/sentinel/coach-requests.processed.jsonl`.
## Scoring
- `8-10`: usable output with clear artifact handoff
- `5-7`: core output exists but a declared contract, evidence item, or handoff is incomplete
- `<5`: missing required output, ungrounded result, or downstream blocker attributable to this stage
## Exit Criteria
- [ ] Each score cites produced or missing artifacts.
- [ ] The coach never evaluates its own generation.
- [ ] Missing artifacts are attributed to the stage that declared them.
- [ ] Console-readable `stage-quality.jsonl` is updated.
## Anti-Rationalization
| Shortcut / Temptation | Why It Fails |
|-----------------------|--------------|
| Treat the skill as complete because the file exists | Skill contracts must describe observable behavior and verification, not just command names. |
| Skip artifact and safety checks for a small command | Small commands still mutate state or guide execution; preserve the same gates. |
