CometChat LangGraph Agent

A LangChain-compatible agent and weather tool designed for seamless integration with CometChat and other chat platforms. This package demonstrates how to build and expose agentic workflows using LangGraph, with real-time streaming and tool execution.

Features

• Weather tool using OpenWeatherMap
• LangGraph agent workflow
• FastAPI server example for NDJSON streaming
• Designed for easy integration with CometChat’s Agentic Platform

Installation

git clone https://github.com/cometchat/cometchat-langgraph-agent
cd cometchat-langgraph-agent/
python3 -m venv .venv
source .venv/bin/activate
pip install -e .
pip install -r requirements.txt

Environment Variables

Copy .env.example to .env and fill in your API keys:

cp .env.example .env

Edit .env and set:

• OPENAI_API_KEY
• OPENWEATHER_API_KEY
• (Optional) MODEL, PORT, HOST

Usage Example

from cometchat_langgraph_agent.agent import graph
from langchain_core.messages import HumanMessage

result = graph.invoke({
    "messages": [HumanMessage(content="What's the weather in London?")]
})
print(result["messages"][-1].content)

Or run the FastAPI server for CometChat integration:

python examples/server.py

Project Structure

cometchat_langgraph_agent/
    __init__.py
    agent.py
    weather_tool.py
examples/
    server.py
tests/
    unit_tests/
    integration_tests/
.env.example
pyproject.toml
README.md
requirements.txt

Running Tests

pytest

CometChat Integration

This agent is designed to work out-of-the-box with CometChat’s Agentic Platform. The included FastAPI server streams NDJSON responses compatible with CometChat’s real-time chat interface. See examples/server.py for integration details.

Getting Started with CometChat

1. Create a CometChat account: https://app.cometchat.com/signup
2. Create a new app in the CometChat dashboard.
3. Navigate to the Agents section and create a new agent (choose "Custom Agent").
4. Set the deployment URL to your running FastAPI server endpoint (e.g., https://your-server.com/kickoff).
5. Test the integration using CometChat’s dashboard or client SDKs.

More Information

• CometChat
• LangGraph Documentation
• LangChain Documentation