Metric Pack Designer

Use this skill when the user wants to extend plugin-eval with a local rubric.

Workflow

1. Clarify the custom rubric categories and target kinds.
2. Define the smallest useful checks[] and metrics[] payload.
3. Create a metric-pack manifest plus a script that prints JSON to stdout.
4. Run the pack through plugin-eval analyze <path> --metric-pack <manifest.json>.

Design Rules

• Keep IDs stable across runs so comparisons stay meaningful.
• Emit only checks[], metrics[], and optional artifacts[].
• Do not try to overwrite the core score or summary.
• Prefer deterministic local signals over subjective text generation.

Reference