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Claude Code skills are reusable instruction sets that customize how Claude Code behaves in your projects. Think of them as pre-built CLAUDE.md configurations that encode best practices for specific languages, frameworks, and workflows. Instead of writing long prompt instructions from scratch every time you start a new project, you install a skill and Claude immediately follows the conventions your team expects.
Skills solve a real problem: Claude Code is powerful out of the box, but it does not know your team's coding standards, your preferred error handling patterns, or whether you use tabs or spaces. A skill fills that gap. When you install the typescript-strict skill, for example, Claude stops using any types, enforces explicit return types, and follows the strict TypeScript compiler options your project already has in tsconfig.json. When you install owasp-top-10, every endpoint Claude writes includes input validation, parameterized queries, and proper authentication checks.
The skill ecosystem is growing rapidly. As of 2026, there are over 150 community-contributed skills covering every major programming language, dozens of frameworks, and specialized domains like security auditing, database optimization, and infrastructure-as-code. The Skill Finder above lets you search, filter, and install any of them with a single command.
Language skills enforce idiomatic patterns for specific programming languages. The typescript-strict skill eliminates any types. The rust-safety skill ensures proper ownership semantics. Each language skill encodes the conventions that experienced developers in that ecosystem consider non-negotiable.
Framework skills go deeper than language skills. They understand routing conventions, component patterns, and state management strategies for specific frameworks like Next.js, Django, Rails, and Spring Boot. Claude stops generating generic code and starts generating framework-native code.
DevOps skills cover infrastructure as code, CI/CD pipelines, container orchestration, and deployment workflows. Install the terraform-modules skill and Claude writes proper module structures with variable validation and output definitions.
Security skills apply defensive coding patterns automatically. OWASP Top 10 prevention, authentication best practices, input validation, and secrets management. These skills turn Claude into a security-aware coding assistant.
Testing skills enforce proper test structure, mocking patterns, fixture organization, and coverage standards for frameworks like Jest, Pytest, Vitest, and Go's testing package.
Behavioral skills change how Claude approaches problems, not just what code it writes. Karpathy's guidelines skill makes Claude think step-by-step. NASA Power of 10 enforces safety-critical coding rules including bounded loops and assertion density.
Data skills cover database patterns, ORM conventions, query optimization, and data pipeline best practices for tools like Prisma, SQLAlchemy, and raw SQL.
Debugging skills improve error handling, structured logging, performance profiling, and root cause analysis patterns in generated code.
Research skills help Claude assist with literature review, data analysis, and technical writing. Productivity skills optimize git workflows, code review processes, and documentation generation.
Installing a Claude Code skill takes one command. From your project directory, run:
npx skills add <author>/<skill-name>
This downloads the skill's instruction set and merges it into your project's CLAUDE.md file. You can install multiple skills, and they compose cleanly. For example, a typical TypeScript/Next.js project might use:
npx skills add ccg/typescript-strict — strict typingnpx skills add ccg/nextjs-app-router — App Router patternsnpx skills add ccg/jest-patterns — testing conventionsnpx skills add ccg/owasp-top-10 — security rulesAfter installation, Claude Code automatically follows all four sets of conventions. No additional configuration needed. To remove a skill, edit your CLAUDE.md and delete the corresponding section.
There is no hard limit. Most projects use 3 to 6 skills. Skills compose well because each one targets a specific domain. A language skill and a framework skill rarely conflict. If two skills have overlapping instructions, the one listed later in your CLAUDE.md takes precedence.
Yes. Skills are just CLAUDE.md instructions. They work on Claude Pro, Claude Max, Claude Team, and Claude Enterprise. The skills themselves are free and open source. The tool above searches the community catalog.
Absolutely. A skill is a structured CLAUDE.md section with a name, description, and instruction set. Create a GitHub repository with your skill file, and anyone can install it with npx skills add your-username/your-skill. See our Skills Reference for the full authoring guide.
Skills add instructions to your context window, which does consume tokens. A typical skill adds 200 to 500 tokens of instructions. For most projects with 3 to 5 skills, this is 1,000 to 2,500 extra tokens per conversation, a negligible cost compared to the improved output quality. See our Cost Optimization Guide for detailed token budgeting.
The skill installer appends new sections to your CLAUDE.md. If you already have instructions that conflict, the later instruction wins. Best practice: install skills first, then add your project-specific overrides at the bottom of the file.
No. Once installed, a skill's instructions are part of your project files. To update, run the install command again and it will replace the existing section. Check the skill's source repository for changelogs and new versions.
Skills are designed for Claude Code specifically, but since they are plain-text instructions in a CLAUDE.md file, many of the conventions apply to any AI coding assistant that reads project configuration files. The install command and tooling are Claude Code specific.
The Skill Finder above indexes over 150 community and official skills. For curated, production-tested skills with detailed documentation, check the Claude Code Playbook which includes 200 skills organized by use case.
This finder shows community skills. For 200 curated, production-tested skills with full documentation:
Get the Claude Code Playbook ($99 Lifetime)