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Skill Creator

Official

Anthropic's official meta-skill for drafting new Claude skills, testing them against baselines, and tuning descriptions for reliable triggering.

UtilitiesIntermediate★ 177,650⑂ 21,037AI score 10/10Last updated: Sep 22, 2026

What it does

  • Interviews you to pin down the skill's purpose, trigger contexts and output format, then writes the SKILL.md draft.
  • Applies the house style: folder anatomy (scripts/, references/, assets/), three-level progressive disclosure, and a ~500-line ceiling for SKILL.md.
  • Generates 2–3 realistic test prompts, spawns with-skill and baseline runs in parallel, then aggregates pass rate, duration and token usage into benchmark.json.
  • Launches a review UI via eval-viewer/generate_review.py for qualitative feedback, reads feedback.json, and drives the improve → rerun → review loop.
  • Includes a separate description-optimization loop (scripts/run_loop) built on 20 should/shouldn't-trigger queries, plus a .skill packaging script.

Who it's for

  • Developers and operators turning repeatable workflows into reusable Claude skills.
  • Anyone whose skill exists but never fires when it should.
  • Teams that want quantitative signal (pass rate, tokens, latency) instead of vibes.

Examples

  1. "Turn the PDF cleanup we just did into a skill" — it mines the conversation for steps and tools, drafts SKILL.md, and proposes test cases.
  2. Improving an existing skill: snapshot the old version as baseline, run both, and compare deltas in the benchmark tab.
  3. Fixing undertriggering: write 20 realistic queries, run the optimization loop, and swap in the best_description chosen by held-out test score.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/anthropics/skills/HEAD/skills/skill-creator/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/skill-creator folder from the GitHub repo anthropics/skills into my ~/.claude/skills/skill-creator/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone --depth 1 https://github.com/anthropics/skills.git /tmp/anthropic-skills && mkdir -p ~/.claude/skills && cp -r /tmp/anthropic-skills/skills/skill-creator ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal; make sure git and Python 3 are installed.
  2. Clone the official repo: git clone --depth 1 https://github.com/anthropics/skills.git /tmp/anthropic-skills
  3. Create the skills directory: mkdir -p ~/.claude/skills
  4. Copy the skill in: cp -r /tmp/anthropic-skills/skills/skill-creator ~/.claude/skills/
  5. Restart Claude Code and say something like "help me build a skill" or "run evals on this skill" to trigger it.
  6. For benchmarking and the viewer, run the bundled Python scripts from the skill-creator directory. On headless machines, pass --static <path> to generate a standalone HTML report instead of starting a server.
View source on GitHub ↗