Agent skills for Claude Code and other agents

Agent skills in the Library

• Higgsfield AI skillsOfficial agent skills (MIT) for image and video generation with Higgsfield, for Claude Code and other agents. Install: npx skills add higgsfield-ai/skills. Uses your Higgsfield account and credits.
• Agent SkillsHome of the Agent Skills open format: a skill is a folder with a SKILL.md file (name, description, instructions) plus optional scripts and references. Includes the full specification.
• Extend Claude with skillsClaude Code documentation on creating, managing and sharing skills to extend what Claude can do, including custom commands and bundled skills.
• Build skills (OpenAI)OpenAI documentation on building skills for ChatGPT and Codex: a skill is a directory with a SKILL.md file plus optional scripts and references, loaded in full only when it is used.
• Rules (Cursor Docs)Cursor documentation on persistent instructions: Project, Team and User Rules, plus AGENTS.md, with guidance on writing effective coding guidelines.
• Cascade Memories & Rules (Devin Desktop)Documentation for Cascade memories and user-defined rules at global, workspace and system level, kept in .devin/rules or the legacy .windsurf/rules. The former Windsurf docs address redirects here.
• Adding repository custom instructions for GitHub CopilotGitHub Docs guide to creating repository custom instructions files that give Copilot context on how to understand a project and how to build, test and validate its changes.
• The Agent Skills Directory (skills.sh)Directory of the open agent skills ecosystem: search reusable skills for AI agents, see a leaderboard by installs, and install any of them with the skills command-line tool.
• Claude Code Plugins DirectoryAnthropic-managed directory of Claude Code plugins: plugins maintained by Anthropic plus third-party plugins from partners and the community, installable from inside Claude Code.
• Cursor MarketplaceCursor's catalogue of verified plugins, which can bundle skills, subagents, rules, hooks, commands and MCP servers.
• Agent Skills (Vercel)Vercel's collection of agent skills: React and Next.js performance guidelines, composition patterns, web interface guideline reviews, React Native, and deploying to Vercel.
• Skills For Designers and EngineersEmil Kowalski's skills for building user interfaces, mostly about animation: choosing easing, duration and properties, reviewing and improving existing animations, plus design advice.

What is an agent skill?

A skill is a folder of instructions and scripts an AI agent loads when a task needs it: a review checklist, a deploy routine, a design system.

Questions