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MCP LangChain Weather Agent

by aboomar26
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Python
Remote

MCP LangChain Weather Agent

A simple weather MCP server connected to a LangGraph agent. The agent calls the weather tool to fetch live weather for any city.

Setup

  1. Install dependencies:

pip install -r requirements.txt

  1. Create a .env file in the project root:

OPENROUTER_API_KEY=your_api_key_here

Related MCP server: mcp-server

Usage

Start the MCP server (runs on http://127.0.0.1:8000):

python weatherserver.py

In a second terminal, run the agent client:

python client.py

The client connects to the weather MCP server, loads the weather tool, and asks the LLM about the weather.

Files

File

Description

weatherserver.py

MCP server with a weather tool (geocoding + Open-Meteo API)

client.py

LangGraph agent that uses the MCP weather tool

requirements.txt

Python dependencies

How it works

  1. User asks a question like "what's the weather in Tokyo?"

  2. The agent calls the weather MCP tool

  3. The server geocodes the city name and fetches current weather from Open-Meteo

  4. The agent returns the result to the user

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