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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

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Resources

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