MCP Test Weather Server

This project is a small Python MCP server that exposes a get_weather tool. The tool accepts a city name, calls the OpenWeatherMap API, and returns current temperature, weather description, and humidity.

What It Contains

• mcp_server.py: Defines the MCP server, registers the get_weather tool, and serves it over Streamable HTTP using Starlette/Uvicorn.

• agent.py: Defines a LangGraph workflow that fetches weather data with httpx.

• requirements.txt: Python dependencies for the server.

Related MCP server: Weather MCP Server

Requirements

• Python 3.13 or newer

• An OpenWeatherMap API key

Setup

Create and activate a virtual environment:

python -m venv .venv
source .venv/bin/activate

Install dependencies:

pip install -r requirements.txt

Configure Weather API

The weather client in agent.py currently uses an OpenWeatherMap API key in the API_KEY constant. For local development, replace it with your own key before running the server.

Run The Server

Start the MCP server:

python mcp_server.py

The server listens on:

http://0.0.0.0:7070

Available MCP Tool

get_weather

Gets current weather information for a city.

Input schema:

{
  "city": "Ahmedabad"
}

Example response text:

Ahmedabad: 31.2°C, clear sky, humidity 42%

If no city is provided, the agent defaults to Ahmedabad.