CodeGraph

Autonomous AI coding agents powered by Claude

Features • Quick Start • Documentation • Architecture • Contributing

Overview

CodeGraph is a self-hosted AI coding agent platform that brings autonomous software development capabilities to your team. Built with multiple specialized AI agents orchestrated through LangGraph, it handles everything from planning to implementation to testing—all while respecting your data governance requirements.

Why CodeGraph?

Self-Hosted: Complete control over your code and data
Multi-Agent: Specialized agents for planning, coding, testing, and review
Smart Model Selection: Automatically uses the right Claude model for each task
Local LLM Support: Cost-free development with vLLM and Qwen 2.5 Coder
Council Review: Multi-judge code review with security, performance, and maintainability perspectives
GitHub Integration: Seamless repository analysis and PR creation
Full Observability: End-to-end tracing with LangSmith
Real-Time Streaming: Watch agents think and work in real-time

Features

Core Capabilities

Autonomous Code Generation: Describe features in natural language, get production-ready code
Intelligent Bug Fixing: Point to a bug report, get diagnosis and fixes with tests
Code Refactoring: Modernize legacy code while maintaining functionality
Automated Testing: Generate comprehensive test suites with high coverage
Documentation: Auto-generate inline docs, READMEs, and API documentation
Repository Analysis: Deep understanding of your codebase structure and patterns

Agent System

CodeGraph uses a sophisticated multi-agent architecture with council-based review:

Agent	Model	Purpose
Planner	Sonnet 4.5 / Qwen	Task breakdown and orchestration
Coder	Opus 4 / Qwen	Code implementation and refactoring
Tester	Sonnet 4.5 / Qwen	Test generation and execution
Test Analyzer	Sonnet 4.5 / Qwen	Parse test results and identify failures
Reviewer	Sonnet 4.5 / Qwen	Code quality assessment
Council Review	Multi-Judge	Security, performance, maintainability review

Security & Authentication

JWT Authentication: Secure token-based auth with refresh tokens
Two-Factor Authentication (2FA): TOTP-based with backup codes
OAuth Integration: GitHub, Google, and Microsoft login
Email Verification: Secure email confirmation flow
Session Management: Multi-device session tracking

Quick Start

Prerequisites

Before you begin, ensure you have:

Docker (20.10+) and Docker Compose (2.0+)
Git (2.30+)
NVIDIA GPU with 16GB+ VRAM (for local LLM, optional)

For cloud deployment (without local LLM):

Anthropic API Key - Get one here

Installation

Clone the repository

git clone https://github.com/lhajoosten/codegraph.git
cd codegraph

Configure environment

cp apps/backend/.env.example apps/backend/.env

Edit apps/backend/.env with your configuration:

# For local LLM (default - no API key needed)
USE_LOCAL_LLM=true

# OR for Claude API
USE_LOCAL_LLM=false
ANTHROPIC_API_KEY=your_anthropic_key_here

# Database
DATABASE_URL=postgresql+asyncpg://codegraph:codegraph@localhost:5432/codegraph
REDIS_URL=redis://localhost:6379/0

# Security
SECRET_KEY=your_secret_key_here  # Generate with: openssl rand -hex 32

# Optional: GitHub Integration
GITHUB_TOKEN=your_github_token_here

# Optional: LangSmith Tracing
LANGCHAIN_TRACING_V2=true
LANGCHAIN_API_KEY=your_langsmith_key_here
LANGCHAIN_PROJECT=codegraph

Start the platform
```
cd docker
docker-compose up -d
```

Verify installation

# Check all services are running
docker-compose ps

# View logs
docker-compose logs -f

Access the application
- Web UI: http://localhost:5173
- API Docs: http://localhost:8000/docs
- API Health: http://localhost:8000/health
- Storybook: http://localhost:6006

First Task

Open http://localhost:5173
Create an account or sign in
Connect your GitHub repository
Create a new task: "Add logging to the user authentication module"
Watch the agents plan, code, test, and create a PR!

Architecture

System Overview

┌─────────────────────────────────────────────────────────┐
│                   React 19 Frontend                      │
│    (Task Management, Monaco Editor, Real-time Updates)  │
│              Port: 5173 | Storybook: 6006               │
└──────────────────────┬──────────────────────────────────┘
                       │ REST API + SSE
┌──────────────────────▼──────────────────────────────────┐
│                   FastAPI Backend                        │
│  ┌──────────────┐  ┌──────────────┐  ┌───────────────┐  │
│  │  API Layer   │  │   Services   │  │  GitHub API   │  │
│  │  (v1 Routes) │  │  (Auth/Task) │  │  Integration  │  │
│  └──────────────┘  └──────────────┘  └───────────────┘  │
│              Port: 8000 | Docs: /docs                   │
└──────────────────────┬──────────────────────────────────┘
                       │
┌──────────────────────▼──────────────────────────────────┐
│              LangGraph Agent Orchestration              │
│  ┌──────────┐  ┌─────────┐  ┌─────────┐  ┌──────────┐   │
│  │ Planner  │→ │ Coder   │→ │ Tester  │→ │ Council  │   │
│  │  Agent   │  │  Agent  │  │  Agent  │  │  Review  │   │
│  └──────────┘  └─────────┘  └─────────┘  └──────────┘   │
│              ↑                              │            │
│              └──────── Revision Loop ───────┘            │
└──────────────────────┬──────────────────────────────────┘
                       │
         ┌─────────────┼─────────────┐
         │             │             │
    ┌────▼────┐   ┌────▼────┐   ┌───▼────┐
    │  vLLM   │   │ Claude  │   │ Claude │
    │  Qwen   │   │ Sonnet  │   │  Opus  │
    │ (Local) │   │  (API)  │   │ (API)  │
    └─────────┘   └─────────┘   └────────┘

Project Structure

CodeGraph/
├── apps/
│   ├── backend/              # Python FastAPI backend
│   │   ├── src/
│   │   │   ├── api/         # API routes (auth, tasks, users, webhooks)
│   │   │   ├── agents/      # LangGraph agents (planner, coder, tester, reviewer, council)
│   │   │   ├── models/      # SQLAlchemy models
│   │   │   ├── schemas/     # Pydantic schemas
│   │   │   ├── services/    # Business logic (auth, 2FA, OAuth, email)
│   │   │   ├── tools/       # Agent tools
│   │   │   └── core/        # Configuration, security, database
│   │   ├── tests/           # pytest tests (unit, integration, AI)
│   │   └── alembic/         # Database migrations
│   │
│   └── frontend/            # React TypeScript frontend
│       ├── src/
│       │   ├── routes/      # TanStack Router routes
│       │   ├── components/  # React components
│       │   ├── hooks/       # Custom hooks
│       │   └── store/       # Zustand stores
│       └── tests/           # Vitest + Playwright tests
│
├── docker/                  # Docker configuration
│   ├── docker-compose.yml   # Full stack compose
│   ├── backend.Dockerfile
│   ├── frontend.Dockerfile
│   └── postgres.Dockerfile
│
├── changelog/               # Weekly development changelogs
├── CLAUDE.md               # AI assistant configuration
└── README.md               # This file

Tech Stack

Frontend

React 19 with TypeScript 5.9
Vite for blazing fast builds
TanStack Router for type-safe routing
TanStack Query for server state
Zustand for client state
Tailwind CSS v4 + Radix UI
Monaco Editor (VS Code's editor)
Storybook for component development

Backend

Python 3.12+ with FastAPI
SQLAlchemy 2.0 (async)
Pydantic v2 for validation
Poetry for dependency management

AI & Orchestration

LangChain for LLM integration
LangGraph for agent workflows
Anthropic Claude (Haiku/Sonnet/Opus 4.5)
vLLM with Qwen 2.5 Coder (local)
LangSmith for observability

Infrastructure

Docker & Docker Compose
PostgreSQL 16 with pgvector
Redis for caching & sessions
Nginx as reverse proxy

For detailed architecture, see Architecture Documentation.

Development

Local Development Setup

Backend:

cd apps/backend

# Install dependencies with Poetry
poetry install

# Start database and Redis
make docker-up

# Run database migrations
make db-migrate

# Start development server
make dev

Frontend:

cd apps/frontend

# Install dependencies
npm install

# Start development server
npm run dev

# Start Storybook
npm run storybook

Running Tests

Backend:

cd apps/backend

# Run fast tests (unit + integration)
make test-fast

# Run AI tests (requires vLLM)
make test-ai

# Run all tests with coverage
make test-cov

Frontend:

cd apps/frontend

# Run unit tests
npm run test

# Run E2E tests
npm run e2e

Code Quality

# Backend - Full check pipeline
cd apps/backend
make check  # Runs lint + format + type-check

# Frontend - Formatting and linting
cd apps/frontend
npm run lint
npm run format
npm run type-check

Configuration

Environment Variables

Required

Variable	Description	Example
`SECRET_KEY`	JWT signing secret	`openssl rand -hex 32`
`DATABASE_URL`	PostgreSQL connection string	`postgresql+asyncpg://...`
`REDIS_URL`	Redis connection string	`redis://localhost:6379/0`

Local LLM (Default)

Variable	Description	Default
`USE_LOCAL_LLM`	Use local vLLM instead of Claude	`true`
`LOCAL_LLM_BASE_URL`	vLLM server URL	`http://localhost:8001/v1`
`LOCAL_LLM_MODEL`	Model to use	`Qwen/Qwen2.5-Coder-14B-Instruct-AWQ`

Claude API (Optional)

Variable	Description	Example
`USE_LOCAL_LLM`	Set to false for Claude API	`false`
`ANTHROPIC_API_KEY`	Your Anthropic API key	`sk-ant-api03-...`

Optional

Variable	Description	Default
`GITHUB_TOKEN`	GitHub personal access token	-
`LANGCHAIN_TRACING_V2`	Enable LangSmith tracing	`false`
`LANGCHAIN_API_KEY`	LangSmith API key	-
`USE_COUNCIL_REVIEW`	Multi-judge code review	`true`
`TWO_FACTOR_MANDATORY`	Require 2FA for all users	`false`

See Configuration Guide for all options.

Monitoring & Observability

LangSmith Integration

CodeGraph integrates with LangSmith for complete observability:

Sign up at smith.langchain.com
Get API key from settings

Configure in .env:

LANGCHAIN_TRACING_V2=true
LANGCHAIN_API_KEY=your_key
LANGCHAIN_PROJECT=codegraph

View traces at: https://smith.langchain.com/o/your-org/projects/codegraph

Metrics Dashboard

Access built-in metrics at http://localhost:5173/metrics:

Task completion rates
Agent performance
Model usage & costs
Error rates by agent
Response time percentiles

Contributing

We love contributions! CodeGraph is built by developers, for developers.

How to Contribute

Fork the repository
Create a feature branch (git checkout -b feature/amazing-feature)
Commit your changes (git commit -m 'feat: add amazing feature')
Push to the branch (git push origin feature/amazing-feature)
Open a Pull Request

See CONTRIBUTING.md for detailed guidelines.

Development Workflow

Check Issues for tasks
Comment on an issue to claim it
Follow our Code of Conduct
Ensure tests pass and coverage is maintained
Update documentation as needed

Community & Support

Get Help

Security

Found a security vulnerability? Please do not open a public issue.

See SECURITY.md for details on reporting security issues.

License

CodeGraph is open source software licensed under the MIT License.

Acknowledgments

Built with amazing open source tools:

Anthropic Claude - Powerful AI models
LangChain - LLM application framework
FastAPI - Modern Python web framework
React - UI library
Tailwind CSS - Utility-first CSS
vLLM - High-throughput LLM serving

Special thanks to all contributors!

Citation

If you use CodeGraph in your research or project, please cite:

@software{CodeGraph,
  author = {Luc Joosten},
  title = {CodeGraph: Autonomous AI Coding Agents},
  year = {2025},
  url = {https://github.com/lhajoosten/CodeGraph}
}

Made with care by developers who love AI

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Name		Name	Last commit message	Last commit date
Latest commit History 38 Commits
.github		.github
apps		apps
changelog		changelog
docker		docker
public/assets/images		public/assets/images
.gitignore		.gitignore
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
ROADMAP.md		ROADMAP.md
SECURITY.md		SECURITY.md

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lhajoosten/CodeGraph

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CodeGraph

Overview

Why CodeGraph?

Features

Core Capabilities

Agent System

Security & Authentication

Quick Start

Prerequisites

Installation

First Task

Architecture

System Overview

Project Structure

Tech Stack

Development

Local Development Setup

Running Tests

Code Quality

Configuration

Environment Variables

Required

Local LLM (Default)

Claude API (Optional)

Optional

Monitoring & Observability

LangSmith Integration

Metrics Dashboard

Contributing

How to Contribute

Development Workflow

Community & Support

Get Help

Security

License

Acknowledgments

Citation

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