Comprehensive guide for creating modular skills that extend Claude's capabilities with specialized knowledge and workflows.

• Skills consist of a required SKILL.md file with YAML metadata and markdown instructions, plus optional bundled resources (scripts, references, and assets) organized in a three-level loading system to manage context efficiently
• Follow a six-step creation process: understand concrete usage examples, plan reusable contents, initialize with the provided script, edit SKILL.md and resources, package with validation, and iterate based on real-world testing
• Use scripts for deterministic, repeatedly-written code; references for documentation and schemas to load as needed; and assets for templates and boilerplate that appear in output
• Write SKILL.md in imperative form with clear procedural guidance on when and how Claude should use the skill, keeping the file lean by moving detailed information to references files