skill-building

Structured guide for building high-quality GitHub Copilot agent skills. Use when creating a new skill, improving an existing one, diagnosing why a skill isn't being invoked, or reviewing a skill before publishing. Triggers: 'create skill', 'build skill', 'new SKILL.md', 'improve skill', 'skill not triggering', 'skill not loading', 'validate skill', 'publish skill', 'YAML frontmatter', 'description field', 'trigger phrases', 'skill structure', 'references folder', 'progressive disclosure'.