codebase-gpt

Ask your codebase questions. Local-first semantic knowledge graph + RAG.

codebase-gpt is a local-first codebase intelligence CLI. No cloud, no API key required. It builds a knowledge graph of your code — functions, classes, imports, change coupling from git history — and lets you ask questions, map architecture, find experts, and track health.

Features

• 🔍 ask — Ask questions in plain English, get answers with file/line references
• 🗺️ map — Auto-generate architecture diagrams (Mermaid) via community detection
• 👥 who — Find who knows about a topic based on git history
• 🏥 health — Complexity hotspots, dead code, bus factor, coupling anomalies
• 📋 diff — Summarize what changed and why, with coupling-aware warnings
• 🤖 Optional LLM — Set OPENAI_API_KEY for AI-enhanced answers (gpt-4o-mini)

Install

npm install -g @phoenixaihub/codebase-gpt

Or use with npx:

npx @phoenixaihub/codebase-gpt index

Quick Start

# 1. Index your codebase (run from project root)
codebase-gpt index

# 2. Ask questions
codebase-gpt ask "How does authentication work?"
codebase-gpt ask "Where is the database connection setup?"

# 3. Generate architecture map
codebase-gpt map

# 4. Find experts
codebase-gpt who "payment processing"

# 5. Health report
codebase-gpt health

# 6. What changed?
codebase-gpt diff --since v1.0.0

Commands

codebase-gpt index

Builds the knowledge graph. Parses TypeScript, JavaScript, Python, Go, Rust, Java. Analyzes git history for change coupling. Incremental — only re-parses changed files.

Options:
  -r, --root <path>   Root directory to index (default: auto-detected)
  -f, --force         Force full re-index
  -v, --verbose       Verbose output

Sample output:

🔍 Scanning files...
  Found 142 source files
🔗 Building import graph...
📊 Computing PageRank...
📝 Generating summaries...
🕰️  Analyzing git history...
  Found 1,203 commits, 87 coupling pairs

✅ Index built successfully
   Files indexed:   142
   Entities:        891
   Import edges:    203
   Coupling pairs:  87

codebase-gpt ask "<question>"

Queries the knowledge graph. Uses TF-IDF search + graph traversal to find relevant code. If OPENAI_API_KEY is set, enhances with GPT-4o-mini.

codebase-gpt ask "How does the user authentication flow work?"

Sample output:

❓ Question: "How does authentication work?"

📍 Relevant code:

Functions / Classes:
  function authenticate @ src/auth/jwt.ts:23
    Validates JWT token and returns user session
  class AuthService @ src/auth/service.ts:45

Files:
  📄 src/auth/jwt.ts
    Functions: authenticate, signToken, verifyToken. Exports: authenticate, AuthService

codebase-gpt map

Detects modules via Louvain community detection on the import graph. Outputs Mermaid diagram.

Sample output:

🗺️  Architecture Map

```mermaid
graph TD
  M0["📦 src/auth<br/>jwt.ts<br/>service.ts"]
  M1["📦 src/api<br/>routes.ts<br/>middleware.ts"]
  M2["📦 src/db<br/>connection.ts<br/>models.ts"]
  M1 --> M0
  M1 --> M2
```

codebase-gpt who "<topic>"

Ranks contributors by expertise (recency × frequency × scope).

Sample output:

👥 Who knows about "payment processing"?

🏆 Expert Ranking:

🥇 Alice Chen
   ██████████ 100% confidence
   Commits: 47 total, 12 recent (90d)
   Files touched: 8

🥈 Bob Smith
   ███████░░░ 71% confidence
   Commits: 23 total, 3 recent (90d)
   Files touched: 5

codebase-gpt health

Comprehensive health report including hotspots, coupling anomalies, dead code, and bus factor.

codebase-gpt diff [--since <commit>]

Summarizes changes grouped by area, with coupling-aware warnings for files that should have changed but didn't.

Supported Languages

| Language | Functions | Classes | Interfaces | Imports | |----------|-----------|---------|------------|---------| | TypeScript | ✅ | ✅ | ✅ | ✅ | | JavaScript | ✅ | ✅ | — | ✅ | | Python | ✅ | ✅ | — | ✅ | | Go | ✅ | ✅ (structs) | ✅ | ✅ | | Rust | ✅ | ✅ (structs) | ✅ (traits) | ✅ | | Java | ✅ (methods) | ✅ | ✅ | ✅ |

Algorithms

• Graph construction: Regex-based AST parsing → entity extraction → edge creation
• Change coupling: Apriori-style co-occurrence on git commit sets
• Community detection: Greedy Louvain on import graph
• PageRank: Identifies core utilities and entry points
• TF-IDF search: Query matching over entity names + comments
• Bus factor: Shannon entropy on contributor distribution

Index Location

The index is stored in .codebase-gpt/index.json in your project root. Add it to .gitignore (or commit it for team sharing):

.codebase-gpt/

Large Repos

• Incremental indexing: only re-parses changed files (hash-based)
• Binary files are automatically skipped
• node_modules, dist, build, vendor are excluded

License

MIT © Phoenix AI Hub

CI Setup

# .github/workflows/ci.yml
name: CI
on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 20
      - run: npm ci
      - run: npm test
      - run: npm run build

Contributing

See CONTRIBUTING.md.