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Claude Skill

Skill Creator skill (Anthropic)

Anthropic skill that guides drafting a new skill, running test prompts against it, reviewing results in a browser viewer, benchmarking, optimizing the skill description and packaging a .skill file.

Maintainer
Anthropic, PBC (anthropics/skills repository)
Licence
Apache-2.0. LICENSE.txt in the skill folder is the Apache License, Version 2.0 text, "Copyright 2026 Anthropic, PBC.". The SKILL.md frontmatter has no license field.
Last release
No tagged release shown (the repository releases list is empty on 2026-10-03). Latest commit on main: 2026-09-29.
Last verified Jump to what it can access ↓

What it can access

A Claude Skill is a set of instructions that may also include scripts, so check what it asks Claude to do and what those scripts can reach. This is what the listing states, based on the sources below. Anavem does not rate it safe or unsafe: check it against what you plan to use it for.

Permissions it asks for

  • Run Python scripts in scripts/: aggregate_benchmark, run_eval, run_loop, improve_description, package_skill, quick_validate, generate_report
  • Call the claude CLI as a subprocess (claude -p) to run test prompts and to propose description improvements; SKILL.md says description optimization needs the claude CLI available in Claude Code
  • Start a local review viewer (eval-viewer/generate_review.py) and open it in a browser, or write a standalone HTML file with --static when the browser cannot be opened or there is no display
  • Create and write skill folders and a packaged .skill file in the working directory

Data it can reach

Docs state: the skill runs Python scripts (SKILL.md). run_eval.py runs claude -p with your test queries, and improve_description.py runs claude -p with a prompt that includes the skill content, current description and eval results, so those go wherever that Claude Code session sends data. generate_review.py serves the review viewer from a local HTTP server bound to 127.0.0.1 and opens it in your browser, or writes a static HTML file with --static. (SKILL.md, scripts/run_eval.py, scripts/improve_description.py and eval-viewer/generate_review.py, 2026-10-03)

How it is installed or connected

Claude Code (steps from the repository README, accessed 2026-10-03, https://github.com/anthropics/skills/blob/main/README.md):

  1. Register the repository as a plugin marketplace: /plugin marketplace add anthropics/skills
  2. Install the plugin that contains this skill: /plugin install example-skills@anthropic-agent-skills
  3. The README says to mention the skill by name afterwards, for example "Use the PDF skill to extract the form fields from path/to/some-file.pdf".

Claude Code skill folders: the Claude Code docs (https://code.claude.com/docs/en/skills, accessed 2026-10-03) list ~/.claude/skills/<skill-name>/ for personal skills and .claude/skills/<skill-name>/ for project skills.

Claude.ai: follow "Using skills in Claude" (https://support.claude.com/en/articles/12512180-using-skills-in-claude, accessed 2026-10-03). For an individual account the article says to enable "Code execution and file creation" under Settings > Capabilities and then toggle skills under Customize > Skills. For an organization account it points to Organization settings > Plugins & skills (Policy tab). Which accounts can use skills is stated on that article and is not asserted here.

Limitations

  • Repository README: provided "for demonstration and educational purposes only"; behavior in Claude may differ from the repository version
  • SKILL.md says the description optimization step needs the claude CLI (claude -p), which is available in Claude Code and not in Claude.ai
  • SKILL.md's Claude.ai section says to skip the browser reviewer where no browser or display exists and to present results in the conversation instead
  • Frontmatter has no license field; the licence comes from LICENSE.txt in the folder
  • The Claude Help Center article says: "Only install skills only from trusted sources." For a skill from a less-trusted source it says to review it before enabling, starting with the bundled files and paying particular attention to code dependencies and bundled resources like images or scripts.

Not sure what to look for? Read what to check before installing.

Quick answers

Who maintains this Claude Skill?
Anthropic, PBC (anthropics/skills repository).
What can it access?
It asks for: Run Python scripts in scripts/: aggregate_benchmark, run_eval, run_loop, improve_description, package_skill, quick_validate, generate_report, Call the claude CLI as a subprocess (claude -p) to run test prompts and to propose description improvements; SKILL.md says description optimization needs the claude CLI available in Claude Code, Start a local review viewer (eval-viewer/generate_review.py) and open it in a browser, or write a standalone HTML file with --static when the browser cannot be opened or there is no display, Create and write skill folders and a packaged .skill file in the working directory. Docs state: the skill runs Python scripts (SKILL.md). run_eval.py runs `claude -p` with your test queries, and improve_description.py runs `claude -p` with a prompt that includes the skill content, current description and eval results, so those go wherever that Claude Code session sends data. generate_review.py serves the review viewer from a local HTTP server bound to 127.0.0.1 and opens it in your browser, or writes a static HTML file with --static. (SKILL.md, scripts/run_eval.py, scripts/improve_description.py and eval-viewer/generate_review.py, 2026-10-03). We do not label anything safe or unsafe; read the official sources before you install.
What licence does it use?
Apache-2.0. LICENSE.txt in the skill folder is the Apache License, Version 2.0 text, "Copyright 2026 Anthropic, PBC.". The SKILL.md frontmatter has no license field. Check the terms if you plan to use it commercially.
What are its limitations?
Repository README: provided "for demonstration and educational purposes only"; behavior in Claude may differ from the repository version. SKILL.md says the description optimization step needs the claude CLI (claude -p), which is available in Claude Code and not in Claude.ai. SKILL.md's Claude.ai section says to skip the browser reviewer where no browser or display exists and to present results in the conversation instead. Frontmatter has no license field; the licence comes from LICENSE.txt in the folder. The Claude Help Center article says: "Only install skills only from trusted sources." For a skill from a less-trusted source it says to review it before enabling, starting with the bundled files and paying particular attention to code dependencies and bundled resources like images or scripts.
When was it last released?
No tagged release shown (the repository releases list is empty on 2026-10-03). Latest commit on main: 2026-09-29. Verified Oct 3, 2026.

Sources

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