Skill Creator
A meta-skill for building and refining other skills through structured iteration. Walk through the full cycle: draft the skill, write test prompts, run evaluations both qualitative and quantitative, then rewrite based on results. It handles users at any entry point, whether they're starting from scratch or already have a draft to optimize. The eval-viewer scripts give you concrete metrics to improve against, and there's a separate flow for tuning skill descriptions to fix undertriggering. Worth noting the guidance on progressive disclosure: keep the main SKILL.md under 500 lines and push reference material into bundled files. Most useful when you're serious about iteration rather than one-shot skill writing.
- skills.sh installs
- 8.3K
- GitHub stars
- 46.7K
- last updated
- Aug 21, 2026
Install
$ npx -y skills add anthropics/claude-plugins-official --skill skill-creator --agent claude-codeInstalls into .claude/skills of the current project.
Files
Skill Creator
A skill for creating new skills and iteratively improving them.
At a high level, the process of creating a skill goes like this:
- Decide what you want the skill to do and roughly how it should do it
- Write a draft of the skill
- Create a few test prompts and run claude-with-access-to-the-skill on them
- Help the user evaluate the results both qualitatively and quantitatively
- While the runs happen in the background, draft some quantitative evals if there aren't any (if there are some, you can either use as is or modify if you feel something needs to change about them). Then explain them to the user (or if they already existed, explain the ones that already exist)
- Use the
eval-viewer/generate_review.pyscript to show the user the results for them to look at, and also let them look at the quantitative metrics
- Rewrite the skill based on feedback from the user's evaluation of the results (and also if there are any glaring flaws that become apparent from the quantitative benchmarks)
- Repeat until you're satisfied
- Expand the test set and try again at larger scale
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- Repository
- github.com/anthropics/claude-plugins-official
- Categories
- Testing & QA, Skill Development, Debugging
- First seen
- May 16, 2026
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