Weather MCP server

MCP Quickstart Resources

Example servers and clients for the Model Context Protocol (MCP), in five languages. These are companion examples for two official tutorials:

• Build an MCP server – a simple MCP weather server exposing two tools backed by the US National Weather Service API
• Build an MCP client – an LLM-powered chatbot MCP client that connects to any stdio server and lets Claude call its tools

What's in this repository

Each example lives in its own directory with its own README covering prerequisites, setup, and how to run it:

All servers communicate over stdio and expose the same two tools: getforecast and getalerts (or get-forecast and get-alerts in TypeScript).

All clients launch a server, list its tools, and start an interactive chat loop in which Claude can call those tools. The Python, TypeScript, and Ruby clients take a path to a server script; the Go and Rust clients take the command to run, plus any arguments.

Note: These example clients need an ANTHROPICAPIKEY to operate. Without a key, each client still connects and lists the server's tools before exiting, so you can verify the MCP wiring without credentials.

You can mix and match across languages: for example, the Python client can drive the TypeScript server. Each client's README lists which server launch forms it supports.

The tests directory contains the smoke tests that run in CI against these examples. See tests/README.md for how they work.

Prerequisites

Each example only needs its own language toolchain. To work across the whole repository (for example, to run the smoke tests) you need:

• Node.js 24+ and npm
• Python 3.10+ and uv
• Go 1.25+
• Rust 1.88+ and Cargo
• Ruby 3.4+ and Bundler

Running the tests

./tests/smoke-test.sh

The smoke tests verify that every server starts and answers MCP requests (including validating structured tool results against the schemas each tool advertises), and that the Python, TypeScript, and Ruby clients can connect to a mock server and list tools. They run automatically on every pull request via GitHub Actions.

Contributing

Contributions are welcome. To submit a change:

1. Fork the repository and create a branch from main.
2. Make your change. Keep the examples minimal - they exist to teach the protocol, not to be production services.
3. If you change an example's behavior, setup, or dependencies, update that example's README to match.
4. Run ./tests/smoke-test.sh and make sure it passes.
5. Open a pull request against main describing what changed and why.

A few conventions to follow, in line with the broader Model Context Protocol contributing guidelines:

Shortened. The full README is on GitHub.