Codebase Mapping Skill

Purpose

Produce consistent, structured documentation of codebase organization.

When to Use

• Starting work on unfamiliar project
• Onboarding new team members
• Documenting architecture decisions
• Before major refactoring

Output Template

Use the template in templates/structure-report.md

Mapping Process

Step 1: Project Identification

Identify project type from configuration files:

• package.json → Node.js
• pyproject.toml / setup.py → Python
• go.mod → Go
• Cargo.toml → Rust
• pom.xml / build.gradle → Java

Step 2: Structure Analysis

Map directories to their purposes:

• src/ or lib/ → Source code
• tests/ or __tests__/ → Test files
• docs/ → Documentation
• scripts/ → Build/utility scripts
• config/ → Configuration files

Step 3: Dependency Graph

Create simplified dependency visualization:

Entry Point
├── Core Module A
│   ├── Utility 1
│   └── Utility 2
├── Core Module B
│   └── External Lib
└── Shared Components

Step 4: Key Files

Identify and document:

• Entry points (main.ts, index.js, app.py)
• Configuration (tsconfig, eslint, etc.)
• Environment handling
• Build configuration

Storage Location

Save output to: docs/research/codebase-map-{date}.md