Codebase Onboarding

Systematically analyze unfamiliar codebases and produce structured onboarding guides.

When to Use

• First time opening a project
• 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"

Quick Start

1. Scan package manifests and config files (identify tech stack and framework)
2. Map directory structure and entry points (top 2 levels)
3. Trace one request lifecycle (entry → validation → business logic → database)
4. Identify naming, error handling, and testing patterns
5. Generate onboarding guide and starter CLAUDE.md