skill-creator: a Claude Code skill by Anthropic
Official
For anyone writing their own Claude skills who wants test runs and a review loop. Skip it if you only install skills that other people made.
High-risk warning At least one scanner rated it high risk, so we keep it out of the top ten. Read its code before you install it.
- Score
- 91of 100
- Rank
- #12of 239
- Installs
- 429Kon skills.sh
- Security
- Warning 5 scanners
- Updated
- 2026
- Context
- ~83tokens always
Install
npx skills add https://github.com/anthropics/skills --skill skill-creator
Run it in your terminal. View the source
Using the Claude app rather than Claude Code? You can add a skill there too. How to add it in the app
skill-creator is also a Claude Code plugin. See that page
What does skill-creator do?
skill-creator is a Claude skill that helps you write a new skill or improve one you already have. It starts by asking what the skill should do, when it should trigger and what it should output, then drafts the SKILL.md file. Next it saves two or three test prompts to evals/evals.json and runs each one in subagents, once with the skill and once without. It grades the runs, builds benchmark.json with pass rates, time and tokens, and opens an eval viewer in your browser for your notes. It repeats this loop until you are happy, can tune the description so the skill triggers more often, and packages a .skill file.
When should you use skill-creator?
Use it when
- Turning a workflow you repeat into a reusable skill
- Checking whether an edited skill beats the old version
- Your skill does not trigger when it should
Skip it when
- You only want to use skills that already exist
- You have no time for test runs and review rounds
What it needs and what it can touch
You need
- Python for the bundled scripts
- The claude CLI for description tuning
What it can do
- Reads and writes skill files and a workspace folder
- Runs Python scripts and starts subagents
- Opens a local review page in your browser
From reading its instructions, not from running it.
Why it scores 91
Strongest on upkeep (100 of 100), weakest on adoption (82).
Is skill-creator safe to install?
At least one scanner rated it high risk, so we keep it out of the top ten. Read its code before you install it. Scanners often miss what other scanners catch, and a skill can change after a scan. Read its source before you install it.
| Scanner | Result | Date |
|---|---|---|
| Gen Agent Trust Hub | Passed | Sep 15, 2026 |
| Socket | Medium risk | Sep 15, 2026 |
| Snyk | Low risk | Sep 15, 2026 |
| Runlayer | High risk | Mar 7, 2026 |
| ZeroLeaks | Passed | Apr 16, 2026 |
Details
- Installs
- 429,152
- Repository stars
- 192,526
- Last repository change
- Tokens always loaded
- about 83
- Tokens when used
- about 8,156
- License
- Apache-2.0
- Data confidence
- High
Did it do the job for you?
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