LangGraph Debug Test

Minimal setup to reproduce and debug edit/reload branching chat issues.

Setup

1. Environment

Create a .env file in backend/ with your OpenRouter API key:

OPENROUTER_API_KEY=sk-or-...

2. Install Backend Dependencies

cd backend
uv sync

3. Install Frontend Dependencies

cd frontend
npm install

Running

Backend (terminal 1)

cd backend
uv run langgraph dev

Frontend (terminal 2)

cd frontend
npm run dev

Usage

Open http://localhost:3000 in your browser.

• Type a message and press Enter
• Edit a user message with the pencil icon
• Regenerate an AI response with the refresh icon

Check the browser console for checkpoint logs when editing/regenerating.