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The open registry for Claude Code

Claude Skills

Claude skills are reusable SKILL.md instructions that extend Claude Code with new capabilities. Install 4,400+ free Claude skills from Anthropic, Microsoft, Google, Vercel, Stripe, and the developer community, in one command, with security scanning and version control built in.

$ npx @skills-hub-ai/cli install code-review

What are Claude skills?

A Claude skill is a Markdown file with frontmatter, a SKILL.md, that tells Claude Code how to do one specific job well. Code review. Test generation. Deploying to Render. Auditing for HIPAA. Generating an API spec. The format is plain text, the standard is open, and the file is portable across every AI tool that supports the Agent Skills spec.

What makes skills different from a system prompt is conditional loading. A system prompt sits in every conversation, eating context. A skill is invoked only when its triggers match the task, so you can install hundreds of Claude skills without bloating the model's context window. Claude reads the skill, follows its instructions, and unloads it when the task is done.

What makes Claude skills different from Cursor rules, Copilot instructions, or any other tool-specific format is portability. The same SKILL.md works in Claude Code, Cursor, Codex CLI, Windsurf, Copilot, Gemini CLI, and any MCP-compatible client. Write once, run in every tool.

Best Claude skills

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The most-installed Claude skills on skills-hub.ai right now. Every skill is versioned, security-scanned, and linked to its upstream GitHub repository.

  1. 01code-review

    57 installs

    Thorough code review — checks correctness, security, performance, readability, and test coverage. Gives actionable feedback ranked by severity.

    Review
  2. 02ui-design-system

    27 installs

    UI design system toolkit for Senior UI Designer including design token generation, component documentation, responsive design calculations, and developer handoff tools. Use for creating design systems, maintaining visual consistency, and facilitating design-dev collaboration.

    Buildfrom Multi-Domain Skills
  3. 03self-improving-agent

    22 installs

    Curate Claude Code's auto-memory into durable project knowledge. Analyze MEMORY.md for patterns, promote proven learnings to CLAUDE.md and .claude/rules/, extract recurring solutions into reusable skills. Use when: (1) reviewing what Claude has learned about your project, (2) graduating a pattern from notes to enforced rules, (3) turning a debugging solution into a skill, (4) checking memory health and capacity.

    Buildfrom Multi-Domain Skills
  4. 04quickstart

    22 installs

    Zero to power user in one invoke — detects OS, installs Homebrew/apt/Node.js/Python, sets up Claude Code, authenticates skills-hub CLI, connects MCP servers, and installs recommended skills based on your project. Cross-platform (macOS, Linux, WSL). Idempotent. Use when: 'quickstart', 'setup machine', 'new machine setup', 'install everything', 'get started', 'onboard me', 'setup skills-hub', 'fresh install'.

    Productivity
  5. 05markitdown

    19 installs

    Convert files and office documents to Markdown. Supports PDF, DOCX, PPTX, XLSX, images (with OCR), audio (with transcription), HTML, CSV, JSON, XML, ZIP, YouTube URLs, EPubs and more.

    Researchfrom Scientific Skills
  6. 06social-media-manager

    17 installs

    When the user wants to develop social media strategy, plan content calendars, manage community engagement, or grow their social presence across platforms. Also use when the user mentions 'social media strategy,' 'social calendar,' 'community management,' 'social media plan,' 'grow followers,' 'engagement rate,' 'social media audit,' or 'which platforms should I use.' For writing individual social posts, see social-content. For analyzing social performance data, see social-media-analyzer.

    Marketingfrom Multi-Domain Skills
  7. 07Skill Finder

    16 installs

    Workflow orchestrator. Decomposes a task into ordered steps, finds or installs the right skill for each step, runs the chain, and offers to save it as a reusable skill.

    Combo
  8. 08security-review

    15 installs

    Security audit and vulnerability assessment for any codebase. Scans for authentication bypasses, missing auth middleware, broken JWT validation (algorithm confusion, weak secrets, missing expiry), OAuth state and PKCE flaws, IDOR and horizontal privilege escalation, vertical privilege escalation via role manipulation, SQL injection, NoSQL injection, XSS (stored, reflected, DOM), command injection, path traversal, SSRF, CSRF, hardcoded secrets and API keys (sk_live_, AKIA, ghp_), .env and credential file exposure, PII leaking in logs and error responses, overfetching sensitive fields, CORS misconfiguration, session fixation, missing secure/httpOnly/sameSite cookie flags, and Firebase/Firestore rule weaknesses. Produces a severity-ranked findings report with exploit scenarios and fix recommendations. Covers OWASP Top 10.

    Reviewfrom Skills Hub
  9. 09pptx

    15 installs

    Use this skill any time a .pptx file is involved in any way — as input, output, or both. This includes: creating slide decks, pitch decks, or presentations; reading, parsing, or extracting text from any .pptx file (even if the extracted content will be used elsewhere, like in an email or summary); editing, modifying, or updating existing presentations; combining or splitting slide files; working with templates, layouts, speaker notes, or comments. Trigger whenever the user mentions "deck," "slides," "presentation," or references a .pptx filename, regardless of what they plan to do with the content afterward. If a .pptx file needs to be opened, created, or touched, use this skill.

    Creativefrom Anthropic
  10. 10marketing-strategy-pmm

    15 installs

    Product marketing skill for positioning, GTM strategy, competitive intelligence, and product launches. Use when the user asks about product positioning, go-to-market planning, competitive analysis, target audience definition, ICP definition, market research, launch plans, or sales enablement. Covers April Dunford positioning, ICP definition, competitive battlecards, launch playbooks, and international market entry. Produces deliverables including positioning statements, battlecard documents, launch plans, and go-to-market strategies.

    Marketingfrom Multi-Domain Skills
  11. 11senior-frontend

    14 installs

    Frontend development skill for React, Next.js, TypeScript, and Tailwind CSS applications. Use when building React components, optimizing Next.js performance, analyzing bundle sizes, scaffolding frontend projects, implementing accessibility, or reviewing frontend code quality.

    Buildfrom Multi-Domain Skills
  12. 12web-research-agent

    14 installs

    A comprehensive autonomous web research agent that performs targeted searches, fetches and parses web content, summarizes findings, and generates structured reports, adhering to industry best practices for accuracy, security, and robustness.

    Analysis
  13. 13unit-test

    14 installs

    Generate comprehensive unit tests with edge cases, error paths, and boundary values. Auto-detects test framework (Vitest, Jest, pytest, go test, flutter_test, RSpec, cargo test, JUnit), scans for untested functions by priority, adopts existing test conventions, generates tests with proper mocks, runs them, and self-heals failures in up to 3 iterations. Measures coverage before and after. Use when you need to add unit tests, increase code coverage, test edge cases, or verify error handling paths.

    Testfrom Skills Hub
  14. 14design-to-code

    13 installs

    Turn a design into production-quality frontend code: extract a design system with tokens and components, make layouts responsive across breakpoints, add dark mode with WCAG-compliant theming, then run a UX audit to validate everything. Use when implementing UI from Figma, adding theming, making an app responsive, or overhauling frontend design consistency.

    Combofrom Skills Hub
  15. 15frontend-design

    13 installs

    Guidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with aesthetic direction, typography, and making choices that don't read as templated defaults.

    Buildfrom Anthropic
  16. 16swot-analysis

    12 installs

    Perform a detailed SWOT analysis — strengths, weaknesses, opportunities, and threats with actionable recommendations. Use when doing strategic assessment, competitive analysis, or evaluating a product or business position.

    Productfrom Product Management Skills
  17. 17senior-backend

    10 installs

    Designs and implements backend systems including REST APIs, microservices, database architectures, authentication flows, and security hardening. Use when the user asks to "design REST APIs", "optimize database queries", "implement authentication", "build microservices", "review backend code", "set up GraphQL", "handle database migrations", or "load test APIs". Covers Node.js/Express/Fastify development, PostgreSQL optimization, API security, and backend architecture patterns.

    Buildfrom Multi-Domain Skills
  18. 18seo-audit

    10 installs

    When the user wants to audit, review, or diagnose SEO issues on their site. Also use when the user mentions "SEO audit," "technical SEO," "why am I not ranking," "SEO issues," "on-page SEO," "meta tags review," or "SEO health check." For building pages at scale to target keywords, see programmatic-seo. For adding structured data, see schema-markup.

    Marketingfrom Multi-Domain Skills
  19. 19using-superpowers

    10 installs

    Use when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions

    Buildfrom Superpowers
  20. 20preflight

    9 installs

    Pre-deploy verification gate. Checks git status, build, tests, migrations, secrets, and commit conventions. Reports READY or NOT READY. Read-only, no changes. Trigger words: preflight, pre-deploy check, ready to deploy, deployment checklist.

    QAfrom Skills Hub
  21. 21Ralph Wiggum Ship It

    9 installs

    Stop overthinking. Ship the thing. The Ralph Wiggum approach to software delivery: naive boldness backed by the confidence that you can fix anything after it lands. For when your inner perfectionist needs to sit down.

    Build
  22. 22refactor

    8 installs

    Systematic code refactoring — extract functions, reduce complexity, eliminate duplication, improve naming, and split large files. Preserves behavior with tests.

    Review
  23. 23market-research-reports

    8 installs

    Generate comprehensive market research reports (50+ pages) in the style of top consulting firms (McKinsey, BCG, Gartner). Features professional LaTeX formatting, extensive visual generation with scientific-schematics and generate-image, deep integration with research-lookup for data gathering, and multi-framework strategic analysis including Porter Five Forces, PESTLE, SWOT, TAM/SAM/SOM, and BCG Matrix.

    Researchfrom Scientific Skills
  24. 24content-marketing

    8 installs

    When the user wants to plan content marketing across channels, define content types and formats, or create a content repurposing strategy. Also use when the user mentions "content marketing strategy," "content types," "content formats," "content repurposing," "content calendar," "content mix," "owned content," "content distribution," "content funnel," or "content planning across channels." For SEO calendar, use content-strategy.

    Marketingfrom Marketing SEO Collection

Claude skills by category

Browse Claude skills organized by what they do. Each category covers the most common tasks in modern AI-assisted development.

How to install Claude skills

  1. 1. Pick a skill from the catalog

    Open /browse, filter by Claude Code, sort by installs or quality, and pick a skill that matches your task. Every skill page shows a security grade, a quality score, and a link to the upstream GitHub repository.

  2. 2. Run the install command

    $ npx @skills-hub-ai/cli install code-review

    The CLI writes the SKILL.md to the right directory (.claude/skills/ for Claude Code) and adds an entry to .skills.json so your team gets the same skill at the same version.

  3. 3. Use the skill

    Open Claude Code and describe a task that matches the skill's triggers, for example, "review this PR" or "deploy to Render." Claude loads the skill on demand, follows its instructions, and unloads it when finished. No need to manage context yourself.

  4. 4. Optional: install via MCP

    If your tool supports MCP, install @skills-hub-ai/mcp and the entire registry becomes searchable as MCP prompts, no per-skill install needed.

Publish your own Claude skill

Built a great workflow in Claude Code? Publish it as a skill, get install counts and ratings, and let other developers run your work with one command. Sign in with GitHub, upload a SKILL.md, or generate one from a natural-language description.

Publish a skill →

Frequently asked questions about Claude skills

What are Claude skills?

Claude skills are reusable instruction files (SKILL.md) that extend Claude Code with specialized capabilities like code review, testing, deployment, security scanning, or documentation. Claude loads a skill on demand when its trigger conditions match the task at hand, so your context window stays focused on the work, not the boilerplate. Skills follow the open Agent Skills standard and work in Claude Code, Cursor, Codex CLI, Windsurf, Copilot, and any MCP-compatible tool.

How do I install a Claude skill?

Run `npx @skills-hub-ai/cli install <skill-slug>` in your project. The CLI writes the SKILL.md file to the right directory for Claude Code (`.claude/skills/`), Cursor, Codex CLI, or any other supported tool, and adds an entry to your `.skills.json` lockfile so your team gets the same skills at the same versions. No API key required.

Where can I find the best Claude skills?

skills-hub.ai indexes 4,400+ Claude skills from 90+ official sources, Anthropic, Microsoft, Google, Vercel, Stripe, Cloudflare, Trail of Bits, Prisma, Supabase, OpenAI, Hugging Face, and more, plus community contributions. Every skill is versioned, security-scanned with an A, F grade, and linked to its upstream GitHub repository.

Are Claude skills free?

Yes. Every skill on skills-hub.ai is free to install and use. The open Agent Skills standard is built on plain Markdown, so skills are portable and you keep ownership of any skills you publish.

How are Claude skills different from system prompts or Cursor rules?

A system prompt is loaded into every Claude conversation by default. A Claude skill is loaded only when its trigger conditions match, so you can have hundreds of skills installed without bloating your context window. Compared to Cursor rules (Cursor-specific, .cursorrules files), skills are tool-agnostic: the same SKILL.md works in Claude Code, Cursor, Codex, Windsurf, Copilot, and MCP tools.

Can I publish my own Claude skill?

Yes. Sign in with GitHub, click Publish, and either upload your existing SKILL.md or generate one from a natural-language description. Once published your skill is searchable, installable in one command, and tracked with install counts, ratings, and a quality score.

Is SKILL.md an official Anthropic format?

Anthropic introduced the Agent Skills standard in late 2025 and publishes its own skills openly at github.com/anthropics/skills. The format has been adopted by 26+ AI tools and platforms. skills-hub.ai mirrors Anthropic's official skills daily and indexes skills from 90+ other companies and community publishers, all conforming to the same standard.

How does skill composition work?

Composition lets you chain multiple Claude skills into a single workflow with dependency ordering and parallel execution, for example, lint → test → security-scan → build. Each skill declares its expected inputs and outputs as structured metadata so the chain is validated before it runs. skills-hub.ai is the only Claude-skills platform that supports composition natively.