Skill Creator

What it does

Skill Creator is a skill that builds skills. It walks Claude through deciding what a new skill should do, drafting the SKILL.md, writing test prompts, and then running and comparing versions until the skill works.

Why it is useful

• It turns "write a skill" into a loop you can measure: a benchmark view shows pass rates, timing and token use for each version.
• It also improves skills you already have, not only new ones.
• The result is packaged as a .skill file that you can install or share.

How to use it

In Claude Code, add the Anthropic marketplace, then install the skill from Browse and install plugins:

/plugin marketplace add anthropics/skills

Then ask Claude to "create a skill that ..." and follow its questions.

Watch out for

• Good evals need real example prompts. Collect three to five real tasks before you start.
• The installed skill folder can be read-only. Copy it before you edit it by hand.