name: codebase-knowledge description: Provides cached knowledge about project domains. Maps files by domain, tracks connections between components, records recent commits. Use before implementing to understand affected areas. allowed-tools: Read, Glob, Grep

Codebase Knowledge - Domain Mapping System

Purpose

This skill provides cached knowledge about project domains:

• Maps files by domain/feature area
• Tracks connections between components
• Records recent commits per area
• Caches architecture decisions

How It Works

Domain Files Location

.claude/skills/codebase-knowledge/domains/
├── [domain-name].md    # One file per domain
└── ...

Domain File Template

# [Domain Name]

## Last Update

- **Date:** YYYY-MM-DD
- **Commit:** [hash]

## Files

### Frontend

- `app/[path]/page.tsx` - Description
- `components/[path]/*.tsx` - Description

### Backend

- `server/trpc/routers/[name].router.ts` - Router
- `server/db/models/[name].model.ts` - Model

### Types/Schemas

- `lib/validators/[name].ts` - Zod schemas

## Connections

- **[other-domain]:** How they connect

## Recent Commits

| Hash   | Date       | Description       |
| ------ | ---------- | ----------------- |
| abc123 | YYYY-MM-DD | feat: description |

## Attention Points

- [Special rules, gotchas, etc]

Workflow

BEFORE Implementation

1. Identify which domain is affected
2. Read domains/[domain].md file
3. Check affected files listed
4. Verify recent commits for context
5. Note connections with other domains

AFTER Implementation

1. Update the domain file
2. Add new commit to "Recent Commits"
3. Add/remove files if changed
4. Update connections if affected

Commands

Check Recent Commits by Domain

git log --oneline -10 -- [list of domain files]

Check Uncommitted Changes

git diff --name-status main..HEAD

Create New Domain File

# Copy template
cp .claude/skills/codebase-knowledge/TEMPLATE.md .claude/skills/codebase-knowledge/domains/[name].md

Rules

MANDATORY

1. READ domain before implementing - Always check cached knowledge
2. UPDATE after implementing - Keep cache current
3. VERIFY connections - Changes may affect other domains
4. RECORD commits - Maintain history

FORBIDDEN

1. Ignore cached knowledge - It exists to accelerate development
2. Leave outdated - Old docs are worse than none
3. Modify without recording - Every commit should be noted

Integration with Agents

The analyzer agent MUST use this skill:

1. Check which domain is affected
2. Read domain file for context
3. Report affected files and connections
4. Update domain after implementation

Version

• v2.0.0 - Generic template (no project-specific domains)