The open specification for defining AI agent skills. Create SKILL.md files that work across Claude Code, Codex CLI, and Gemini CLI.
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Agent Skills are a simple, open format for giving agents new capabilities and expertise.
Skills are folders of instructions, scripts, and resources that agents can discover and use to perform better at specific tasks. Write once, use everywhere.
This repo contains the specification, documentation, and reference SDK. Also see a list of example skills here.
Agent Skills is an open format maintained by Anthropic and open to contributions from the community.
Code in this repository is licensed under Apache 2.0. Documentation is licensed under CC-BY-4.0. See individual directories for details.