skill-creator: Anthropic's Skill for Building Skills

/plugin install skill-creator@claude-plugins-official

skill-creator is Anthropic’s skill for making skills. It helps you create a new skill from scratch, improve an existing one, run evals to test it, benchmark performance across runs, and optimize a skill’s description so Claude triggers it at the right moments.

What it does

• Captures intent by interviewing you about what the skill should do and when.
• Writes the SKILL.md with frontmatter and concise instructions, plus supporting files where useful.
• Tests the skill with eval prompts, including variance analysis across repeated runs.
• Tunes triggering by rewriting the description, the field Claude reads to decide whether to load a skill.

New to skills? Read our Claude Code skills guide first.

Install

From Anthropic’s official plugin marketplace, inside Claude Code:

/plugin install skill-creator@claude-plugins-official

Or from the anthropics/skills marketplace, where it ships in the example-skills bundle:

/plugin marketplace add anthropics/skills
/plugin install example-skills@anthropic-agent-skills

You can also copy the skills/skill-creator folder into ~/.claude/skills/. On claude.ai, Anthropic’s example skills are available on paid plans.

Example usage

Create a skill that writes release notes from merged PRs since the last tag
Improve my deploy skill. It triggers when I only ask about deployment status
Run evals on the api-conventions skill and tell me where it fails

Tips

• Write the description as “what it does + when to use it”, with the key use case first; Claude Code truncates long descriptions in the skill listing.
• Keep SKILL.md under about 500 lines and move reference material to separate files.
• Use disable-model-invocation: true for skills with side effects, such as deploys.

Source and license

Part of anthropics/skills, licensed Apache-2.0. Anthropic notes these skills are provided for demonstration and educational purposes, so test before relying on them for critical work. Related: mcp-builder, plugins guide.