Skill Creator
Skills are modular packages that extend Claude's capabilities by providing specialized knowledge, workflows, and tools. They function as onboarding guides for specific domains, transforming Claude into a specialist.
Install
/plugin marketplace add anthropics/skillsThen run /plugin to install the skill set that includes it. In Claude.ai and the Claude app, Anthropic skills are built in: turn them on in Settings → Capabilities.
npx skills add anthropics/skills --skill skill-creatorgit clone --depth 1 https://github.com/anthropics/skills.git /tmp/skills
mkdir -p ~/.claude/skills
cp -r /tmp/skills/skills/skill-creator ~/.claude/skills/skill-creatorPersonal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.
What this skill does
Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.
Trigger phrases
Claude loads this skill automatically when you say things like:
How it works
- Understanding: Gather concrete examples of skill usage
- Planning: Identify reusable resources (scripts, references, assets)
- Initializing: Generate a skill template using init_skill.py
- Editing: Implement resources and write SKILL.md documentation
- Packaging: Create distributable .skill file
- Iterating: Refine based on real-world usage feedback
When to use it
- When creating new Claude skills
- When updating existing skills
- When extending Claude's capabilities
Best practices
- Use progressive disclosure principles for context efficiency
- Include concrete examples of skill usage
- Iterate based on real-world feedback
From the SKILL.md
# 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.py` script 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 Your job when using this skill is to figure out where the user is in this process and then jump in and help them progress through these stages. So for instance, maybe they're like "I want to make a skill for X". You can help narrow down what they mean, write a draft, write the test cases, figure out how they want to evaluate, run all the prompts, and repeat.
Details
- Skill name
skill-creator- Repository
- anthropics/skills
- Path
skills/skill-creator/SKILL.md
FAQ
What does the Skill Creator skill do?
Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.
How do I install the Skill Creator skill?
Claude Code plugin: /plugin marketplace add anthropics/skills. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.
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