Claude Skills

Claude Skills packages specialized expertise—instructions, scripts, and resources—into modular, reusable components that Claude dynamically loads for complex, domain-specific tasks.

Claude Skills transforms Claude into a specialist by packaging your procedural knowledge into portable, reusable folders: a `SKILL.md` file, instructions, and executable scripts. This feature (available to Pro, Max, Team, and Enterprise users) enables Claude to automatically perform complex, non-deterministic tasks like generating professional Excel spreadsheets with formulas, creating PowerPoint presentations, or processing PDFs. The system uses "progressive disclosure," loading only the skill's name and description initially, then the full content as needed, ensuring efficiency across Claude.ai, Claude Code, and the API. Developers can build custom skills for internal workflows via the Claude Developer Platform.

https://www.anthropic.com/engineering/equipping-agents-for-the-real-world-with-agent-skills