Anthropic/skill-creator — Agent Skills | officialskills.sh
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skill-creator

officialai-tools

A skill for building, testing, and refining other skills.

Setup & Installation

npx skills add https://github.com/anthropics/skills --skill skill-creator
or paste the link and ask your coding assistant to install it
https://github.com/anthropics/skills/tree/main/skills/skill-creator
View on GitHub

What This Skill Does

A skill for building, testing, and refining other skills. It guides you through drafting a skill, running test cases with and without the skill, reviewing outputs qualitatively and quantitatively, and iterating based on feedback. Also handles description optimization to improve when the skill gets triggered.

It handles the full create-test-iterate loop automatically, including spawning baseline comparison runs, grading assertions, and launching a review viewer, which would otherwise require coordinating multiple scripts and manual eval tracking.

When to use it

  • Writing a first draft of a skill from a rough idea or existing workflow
  • Running parallel test cases to compare outputs with and without a skill active
  • Reviewing eval results in a browser viewer before deciding what to change
  • Benchmarking two versions of a skill to measure improvement across iterations
  • Optimizing a skill's description so it triggers at the right times and not others