Cartographer

Map and document codebases of any size using parallel AI subagents.

Creates docs/CODEBASE_MAP.md with architecture diagrams, file purposes, dependencies, and navigation guides. Updates CLAUDE.md with a summary.

Triggers

Activate when user says: "map this codebase", "cartographer", "/cartographer", "create codebase map", "document the architecture", "understand this codebase", or when onboarding to a new project.

Critical Principle

"Opus orchestrates, Sonnet reads."

Never have Opus read codebase files directly. Always delegate file reading to Sonnet subagents—even for small codebases. Opus plans the work, spawns subagents, and synthesizes their reports.

Process

1. Check for Existing Map