Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.
What it does
A SKILL.md that performs well is harder to write than it looks. The trigger description — the few sentences that tell Claude when to activate the skill — has to be specific enough to fire reliably but broad enough to catch all the relevant prompts. This skill gives Claude the format, the eval methodology, and the refinement workflow for building skills that actually work. It also includes variance analysis: run a skill against 10 test prompts and see how consistently it triggers.
Use case
When you've found a workflow that consistently gives good results and want to formalise it as a reusable skill. Also use it when an existing skill isn't triggering reliably — the refinement workflow targets the trigger description specifically. Made by Anthropic.
"Turn my code review process into a SKILL.md — here are my rules." "This skill isn't firing when I ask about database queries. Fix the trigger description." "Create a skill that teaches Claude my team's commit message format." "Run evals on this skill: test it against these 10 prompts and tell me the trigger rate." "Build a skill for my design system — here are the typography and colour rules."
Describe the workflow, rules, or pattern you want captured. Be specific — vague input produces vague skills.
Claude drafts the SKILL.md with a trigger description, instructions, and any reference material.
Test it: use your normal prompts and see if it fires. If not, ask Claude to run the eval suite and tighten the trigger description.
Input
A workflow description, a set of rules, a prompt that works well and you want to repeat, or an existing skill that needs improving.
Output
A formatted SKILL.md with a calibrated trigger description, structured instructions, and optionally an eval report showing trigger rate across test prompts.
npx skillsadd anthropics/skills/skill-creator
npx skillsadd anthropics/skills/skill-creator
Requires skills.sh CLI
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