Apply Anthropic Skill Best Practices

This is the meta-skill for writing better skills. It codifies Anthropic's official best practices into a reference you can invoke while building complex skills. The key insight here is progressive disclosure: only metadata loads upfront, so you want a laser-focused description for discovery, then structure SKILL.md as a table of contents that points to detailed files as needed. Keep the main file under 500 lines, test across models (Haiku needs more guidance, Opus needs less), and always write descriptions in third person or Claude gets confused during discovery. Use it when you're building something non-trivial and want to avoid the common mistakes that kill skill performance at scale.