Claude Code's 17 Official Skills: the Rule vs the Practice

Anthropic's docs are clear: a SKILL.md should be under 500 lines. Their own docx skill is 590. I read all 17 of Anthropic's official skills, frontmatter by frontmatter, while building my own marketplace alongside. Every time, the same gap: the docs say one thing, the corpus does another. And the corpus is the one that's right. Here's what actually comes out when you read the code instead of the docs. The description is 90% of the skill A skill is useless if it doesn't trigger at the right…