RabbitAI — AI Code Reviewer

Open-source AI code reviewer that auto-reviews GitHub PRs with zero cost and full self-hosting.

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What is RabbitAI?

RabbitAI is an open-source AI code reviewer. Drop one workflow file into any repo and it reviews every PR automatically catching bugs, security issues, and performance problems — and posts a structured comment directly on the PR.

Unlike other code reviewers, RabbitAI:

• Builds a knowledge graph of your codebase to detect blast radius of changes
• Uses mem0 persistent memory to get smarter with every PR it reviews
• Supports Gemini and OpenAI for both LLM and embeddings fully config-driven
• Supports ChromaDB, Pinecone, and Qdrant as vector stores
• Runs as a GitHub Action, MCP server inside Claude/Cursor, or local CLI
• Runs completely free using Gemini free tier + local ChromaDB

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Demo

How It Works

PR opened
→ Fetch diff + metadata via GitHub API
→ Build NetworkX file dependency graph (blast radius detection)
→ Classify change type (bug fix / feature / refactor / security)
→ Chunk diff → embed → store in vector DB
→ Load repo memory from mem0 (past learnings)
→ Retrieve relevant chunks via semantic search
→ LLM reviews with full context + memory + graph insights
→ Post structured comment on PR
→ Save new learnings to mem0

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Quick Start

Option 1 — GitHub Action (recommended)

Add .github/workflows/review.yml to your repo:

name: RabbitAI Code Review

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  review:
    runs-on: ubuntu-latest

    permissions:
      pull-requests: write
      contents: read

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      - name: Install RabbitAI
        run: pip install rabbitai-reviewer

      - name: Run RabbitAI
        env:
          GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PINECONE_API_KEY: ${{ secrets.PINECONE_API_KEY }}
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          GITHUB_REPOSITORY: ${{ github.repository }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          VECTOR_STORE_PROVIDER: ${{ vars.VECTOR_STORE_PROVIDER }}
          EMBEDDING_PROVIDER: ${{ vars.EMBEDDING_PROVIDER }}
          EMBEDDING_MODEL: ${{ vars.EMBEDDING_MODEL }}
          LLM_PROVIDER: ${{ vars.LLM_PROVIDER }}
          LLM_MODEL: ${{ vars.LLM_MODEL }}
          REVIEW_LANGUAGE: ${{ vars.REVIEW_LANGUAGE }}
        run: |
          python -c "
          import os
          from rabbitai.agent import run
          result = run(os.environ['GITHUB_REPOSITORY'], int(os.environ['PR_NUMBER']))
          print(result.comment_url if result.posted else result.reason)
          "

Add GEMINI_API_KEY to your repo secrets get one free at aistudio.google.com.

GITHUB_TOKEN is injected automatically. Open a PR done.

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Option 2 — Local CLI

git clone https://github.com/nikhilsaiankilla/rabbitai
cd rabbitai
pip install rabbitai-reviewer
cp config.example.yaml config.yaml
# fill in your config.yaml

# test.py
from rabbitai.agent import run

result = run(repo_name="your-username/your-repo", pr_number=1)
print(result)

python test.py

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Stack

Layer	Default	Alternatives
LLM	Gemini 2.0 Flash (free)	GPT-4.1-mini
Embeddings	Gemini embedding-001 (free)	text-embedding-3-small
Vector store	ChromaDB (local, free)	Pinecone, Qdrant
Memory	mem0 (local, free)	—
Dependency graph	NetworkX (free)	—
Workflow	LangGraph (free)	—
Total		$0/month

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Configuration

Copy config.example.yaml to config.yaml and fill in your values.

github_token: "" # local dev only Actions injects GITHUB_TOKEN automatically
gemini_api_key: "" # free at aistudio.google.com

embedding:
  provider: "gemini" # gemini | openai
  model: "" # leave empty for provider default
  api_key: "" # openai only

llm:
  provider: "gemini" # gemini | openai
  model: "" # leave empty for provider default
  api_key: "" # openai only

vector_store:
  provider: "chromadb" # chromadb | pinecone | qdrant
  path: "./chroma_db" # for chromadb only
  collection: "pr-chunks"

memory:
  enabled: true
  repo_context: |
    Describe your repo so RabbitAI understands it from day one.

review:
  language: "typescript"
  focus:
    - bugs
    - security
    - performance
  min_risk_score: 0 # 0 = always post
  post_score: true

All values can be overridden with environment variables. See the full docs for provider setup, dimension reference, and all config options.

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Project Structure

rabbitai/
├── .github/
│   └── workflows/
│       ├── review.yml        ← self-review on every PR
│       └── publish.yml       ← auto publish to PyPI on merge to main
├── rabbitai/
│   ├── nodes/
│   │   ├── fetcher.py        ← fetch PR diff + metadata
│   │   ├── graph_builder.py  ← NetworkX dependency graph + blast radius
│   │   ├── classifier.py     ← change type detection
│   │   ├── embedder.py       ← embeddings + vector DB storage
│   │   ├── retriever.py      ← semantic search over stored chunks
│   │   ├── reviewer.py       ← LLM review generation
│   │   └── poster.py         ← GitHub PR comment poster
│   ├── memory/
│   │   └── repo_memory.py    ← mem0 persistent memory
│   ├── mcp/
│   │   └── server.py         ← MCP server for Claude/Cursor
│   ├── utils/
│   │   ├── config.py         ← config loader + env var overrides
│   │   └── prompts.py        ← review prompt templates
│   └── agent.py              ← LangGraph 9-node workflow entry point
├── config.example.yaml
├── pyproject.toml
└── requirements.txt

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Roadmap

• 9-node LangGraph workflow
• NetworkX knowledge graph + blast radius detection
• ChromaDB, Pinecone, and Qdrant support
• Gemini and OpenAI for LLM and embeddings
• mem0 persistent memory
• MCP server for Claude/Cursor
• Published to PyPI — pip install rabbitai-reviewer
• Auto publish to PyPI on merge to main
• GitLab and Bitbucket support
• Web dashboard for review history
• Slack and Discord notifications
• Fine-tuned prompts per language

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Contributing

PRs welcome. RabbitAI reviews its own PRs.

1. Fork the repo
2. Create your branch git checkout -b feat/your-feature
3. Commit git commit -m 'feat: your feature'
4. Push and open a PR

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License

MIT use it, fork it, self-host it, build on it.

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Built by Nikhil Sai · @itzznikhilsai

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