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Best Claude Code skills (by category)

Skills are portable instruction files (agentskills.io) that teach Claude a repeatable capability — and they run in Codex, Cursor and Gemini CLI too. These are the categories worth having; install any into .claude/skills/ in one click.

  1. 1
    Testing & TDD
    Write, run and fix tests; enforce a red-green-refactor loop.
  2. 2
    Security review
    Check for injection, secrets, unsafe deps and auth gaps.
  3. 3
    Accessibility & UI polish
    Audit contrast, focus order and ARIA; refine components.
  4. 4
    Documentation
    Generate README, API docs and changelogs from the code.
  5. 5
    Data & SQL
    Write and explain queries; shape data into reports.
  6. 6
    DevOps & CI
    Author CI pipelines, Dockerfiles and infra config.
  7. 7
    Refactoring
    Simplify and de-duplicate without changing behavior.
  8. 8
    Design & frontend
    Build responsive, on-brand UI that meets your design system.
Find & install

Browse the full, safety-scanned collection on ConfigDeck.

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FAQ

What's the minimum a skill needs?
Just name and description in its SKILL.md frontmatter.
Do skills work outside Claude Code?
Yes — the agentskills.io format is also used by Codex, Cursor and Gemini CLI.
How is a skill different from a subagent?
A skill loads into your current conversation; a subagent runs in its own isolated context.
Where do skills install to?
.claude/skills/<name>/SKILL.md, via ConfigDeck or by hand.