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 frontmatter (name, description) and optional bundled resources: scripts for deterministic tasks, references for documentation, and assets for templates or boilerplate
• Use progressive disclosure to manage context: metadata always loads, SKILL.md loads on trigger, bundled resources load as needed; keep SKILL.md under 500 lines and split large content into separate reference files
• Match specificity to task fragility: high freedom for flexible approaches, medium freedom for preferred patterns with variation, low freedom for error-prone operations requiring exact sequences
• Follow a six-step creation process: understand concrete usage examples, plan reusable contents, initialize with init_skill.py, implement resources and SKILL.md, package with package_skill.py, then iterate based on real usage
• Write descriptions that include both what the skill does and specific triggers for when to use it; keep explanations concise by assuming Claude's existing knowledge and challenging each piece of information for token efficiency