Design custom metric packs for plugin-eval so teams can add local evaluation rubrics that emit schema-compatible checks and metrics. Use when the user wants their own evaluation criteria or visualizations.
Scanned 9/12/2026
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---
name: metric-pack-designer
description: Design custom metric packs for plugin-eval so teams can add local evaluation rubrics that emit schema-compatible checks and metrics. Use when the user wants their own evaluation criteria or visualizations.
---
# 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
- `references/metric-pack-manifest.md`
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