Skill Creator
✨ SkillA meta-skill for building and improving other Agent Skills
Anthropic's official open-source (Apache-2.0) meta-skill: it teaches Claude to create new skills from scratch, edit and optimize existing ones, run evals with variance analysis, and tune a skill's description for better trigger accuracy. The canonical starting point for authoring your own Skills.
Why we picked it
An Agent Skill is just a folder of instructions and scripts — but writing a good one is its own craft. Skill Creator distills Anthropic's in-house practice into a skill: it scaffolds the structure, writes the trigger description, generates scripts, and quantifies results with evals.
It's Apache-2.0 open source, shipped alongside the official skills repo, with no ads, no tracking and no sign-up. If you want to give your agent new abilities, this is the most authoritative place to start.