A walkthrough of creating custom skills (commands) in Claude Code and applying spec-driven development. Covers how to create skill files in the .claude/skills directory using Markdown with front matter, how skills execute shell commands before being read by the AI, and how to scaffold API endpoints using a reusable skill. Also demonstrates writing feature specifications with acceptance criteria in a specs folder, then using an 'implement-spec' skill to automate feature implementation end-to-end across schemas, services, and routes in a FastAPI backend.
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