Installs into .claude/skills of the current project.
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# Improving a skill
Ship skill changes with evidence, not intuition.
## Baseline vs candidate
Each eval run executes scenarios twice:
- **Baseline** — agent without the skill (or prior version)
- **Candidate** — agent with the skill under test
Scores roll up to `impactScore` and `impactDelta` on `contextEvalRuns`.
## Define good scenarios
- Real task prompts from production WorkOrders
- Weighted criteria aligned to skill purpose
- At least one negative case (skill should refuse or defer)
## Read results
**Registry → Eval Runs** shows per-scenario criterion breakdown. FAILED runs include `errorMessage` for timeout or lint failures.
## Close the loop
Accept meta-loop suggestions of kind `EVAL_SCENARIO` or `SKILL_UPDATE` to auto-create scenarios or draft package patches.
## Publish policy
With `eval.framework` enabled, publish is blocked until latest eval COMPLETED with acceptable impact delta.
See [Eval runs](../registry/eval-runs.md).
