Codebase Onboarding Systematically analyze an unfamiliar codebase and produce a structured onboarding guide. Designed for developers joining a new project or setting up Claude Code in an existing repo for the first time. When to Use - First time opening a project with Claude Code - Joining a new team or repository - User asks "help me understand this codebase" - User asks to generate a CLAUDE.md for a project - User says "onboard me" or "walk me through this repo" How It Works Phase 1: Reconnaissance Gather raw signals about the project without reading every file. Run these checks in parallel…