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LangGraph Backend

This backend uses the LangGraph CLI to serve a LangGraph agent.

Setup

  1. Install dependencies: It is recommended to use a virtual environment.

    pip install -r requirements.txt

  2. Set API Key: Export your Thesys API key as an environment variable. Create a new key on the Thesys Console if you haven't already.

    export THESYS_API_KEY=sk-th-...

  3. Run the server: Use the LangGraph CLI to start the development server:

    langgraph dev

    The server will be available at http://localhost:2024 by default.

Configuration

The backend is configured via langgraph.json, which points to the compiled graph in graph.py.

  • Graph definition: graph.py contains the StateGraph logic.
  • Tools: tools.py contains the tools available to the agent.
  • Persistence: The LangGraph development server handles thread persistence automatically.

API Documentation

Once the server is running, you can access the interactive API documentation and the LangGraph Studio at: