What are Agent Skills (Claude Skills)?

Agent Skills, also known as Claude Skills, are folders containing instructions, scripts, and resources that AI agents load dynamically to improve performance on specialized tasks. They package expertise into discoverable capabilities that help AI assistants complete specific tasks more effectively.

How do Agent Skills work?

Skills are model-invoked—AI agents autonomously decide when to use them based on your request and the Skill's description. They use only ~100 tokens for scanning and less than 5,000 tokens when activated, making them efficient and powerful.

Do ChatGPT and Codex support skills?

Yes! As of December 2025, OpenAI adopted the skills format for ChatGPT and Codex CLI. Skills are now an open standard that works across Claude, ChatGPT, Codex, Cursor, and other MCP-enabled AI platforms.

How do I install an Agent Skill?

Skills can be installed in several ways depending on your platform. For Claude: Add to ~/.claude/skills/ for personal use, or .claude/skills/ for project sharing. For ChatGPT: Use the /home/oai/skills folder. For Codex CLI: Add to ~/.codex/skills/.

Where can I use Agent Skills?

Skills are portable—they use the same format everywhere. Build once, use across Claude, ChatGPT, Codex, Cursor, and any MCP-enabled platform. This open standard means skills work consistently across different AI assistants.

What's the difference between Skills and MCP servers?

Skills extend AI agent capabilities through instructions and scripts that agents load when needed for specific tasks. MCP (Model Context Protocol) servers are standalone protocol implementations that connect AI agents to external tools, services, and data sources. Skills teach agents how to do things, while MCP servers connect agents to things—they work best together.

Agent Skills Directory for Claude, ChatGPT & Codex

Top Agent Skills

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Prompt Lookup

142,398

Accesses and optimizes a comprehensive library of community-curated AI prompts to enhance model performance and task accuracy.

Content Management

Skill Lookup & Installer

142,398

Discovers, retrieves, and installs reusable AI agent capabilities and domain-specific skills directly into your Claude environment.

Productivity & Workflow

Next.js Cache Components Expert

137,158

Optimizes Next.js applications using Cache Components, Partial Prerendering (PPR), and modern granular caching directives.

Developer Tools

Dify Frontend Testing

124,859

Generates high-quality Vitest and React Testing Library tests for Dify's frontend components, hooks, and utilities.

Security & Testing

Electron Chromium Upgrade Guide

119,618

Guides developers through the complex two-phase process of upgrading Chromium versions within the Electron repository.

Developer Tools

Skill Writer

96,002

Author and optimize custom Agent Skills for Claude Code with standardized structures, frontmatter, and discovery-optimized descriptions.

Productivity & Workflow

Latest Agent Skills

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Sonnet Code Implementation

Executes technical plans and implements production-grade code using the Claude Sonnet model within automated multi-AI workflows.

Productivity & Workflow

Review Sonnet (Fast Code Review)

Performs rapid, automated reviews of development plans and code implementations to identify security risks, logic errors, and testing gaps.

Security & Testing

Review Opus (Deep Code Review)

Provides deep architectural analysis and security-focused code reviews using the reasoning power of Claude Opus.

Security & Testing

Review Sonnet: Fast Code & Plan Review

Performs rapid, high-quality reviews of implementation plans and source code to ensure security, correctness, and test coverage.

Security & Testing

Review Codex

Performs comprehensive final code and plan reviews using the Codex CLI to ensure implementation quality and standard compliance.

Collaboration Tools

Multi-AI Development Pipeline

Orchestrates a rigorous development lifecycle that guides AI through planning, multi-stage reviews, and implementation to ensure production-grade code.

Developer Tools