How I indexed 69,000 Claude Code skills (and what I learned doing it)

One month ago I started building an open catalog of Claude Code skills. Yesterday it crossed 69,369 indexed SKILL.md files. This post is the engineering story - what I built, what surprised me, and what's free for anyone to use. If you've never written a Claude Code skill: it's a Markdown file with YAML frontmatter that gives Anthropic's Claude Code agent specialized behavior. Drop it in ~/.claude/skills/ /SKILL.md and Claude can invoke it as a slash command.