# LangGraph Code Review Agent

This repository implements a LangGraph agent that performs a code review on a Python function.  The graph consists of three nodes:

1. **draft_review** – generates an initial review.
2. **reflect** – a critic that scores the review on four criteria (PEP8, type hints, edge cases, naming) and decides whether a rewrite is required.
3. **rewrite** – rewrites the weakest part of the review.

The graph runs for a maximum of `max_rounds` (default 2).  The demo can be executed with `python -m main`.

## Requirements

```text
langgraph>=0.2.0
langchain-openai>=0.2.0
python-dotenv>=1.0.0
```

## Usage

```bash
# Install dependencies
pip install -r requirements.txt

# Run the demo
python -m main
```

The demo uses a simple `sort_numbers` function.  The output shows the final review, the scores for each criterion, the verdict, and the number of rounds performed.

## Environment Variables

The agent uses OpenAI.  Set the `OPENAI_API_KEY` environment variable before running.