skill-creator

To create and test Claude skills, draft a SKILL.md file with valid frontmatter, add optional bundles to scripts, references, and assets, then run evaluations and benchmark performance to iterate on quality and triggering accuracy.

A SKILL.md file is the core format for defining Claude skills, requiring a name and description in its frontmatter. You need it when creating, refining, or evaluating automated skill workflows to structure triggering logic and bundle dependencies.

The best way to optimize skill triggering descriptions is to run structured evaluations using evals.json artifacts, review timing and benchmark data, then iteratively refine the SKILL.md frontmatter description until triggering accuracy meets your criteria.

Yes, pyyaml is a required dependency for this skill creation workflow. You need it installed in your environment to parse SKILL.md frontmatter and process evaluation artifacts like evals.json during benchmarking and optimization.

Yes, this workflow supports modifying existing skills. You can load an existing SKILL.md, adjust its frontmatter or bundled components in scripts, references, and assets, then run evals to benchmark changes and validate improvements before finalizing.

Skill evaluations may not trigger correctly if the SKILL.md frontmatter description lacks specific keywords or is too generic. Running structured evals and reviewing evals.json benchmark data helps identify triggering gaps so you can refine the description for accuracy.