LangGraph RemoteGraph Example

This example demonstrates how to use LangGraph's RemoteGraph as a subgraph in a parent graph, including thread-level persistence.

Setup

1. Create and activate a virtual environment:

python -m venv venv
.\venv\Scripts\activate  # On Windows
source venv/bin/activate  # On Unix/MacOS

2. Install dependencies:

pip install -r requirements.txt

3. Configure environment variables:
   • Copy .env.example to .env
   • Update the following variables in .env:
     • DEPLOYMENT_URL: Your LangGraph deployment URL
     • LANGSMITH_API_KEY: Your LangSmith API key

Features

The example demonstrates:

1. Using RemoteGraph as a subgraph in a parent graph
2. Invoking the graph synchronously
3. Streaming outputs from both parent and child graphs
4. Thread-level persistence for maintaining state

Usage

Run the example:

python remote_graph_example.py

File Structure

• remote_graph_example.py: Main example code
• requirements.txt: Project dependencies
• .env: Environment variables (not in version control)
• README.md: This documentation

Requirements

• Python 3.8+
• LangGraph deployment URL
• LangSmith API key