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Weather MCP Server (Laravel)

A small learning/testing project for exploring the Model Context Protocol (MCP) using the laravel/mcp package. It exposes a Weather MCP server with a single get-weather tool, plus a browser-based console for connecting to the server and calling the tool by hand.

This repo exists purely to learn how Laravel MCP servers, tools, and the Streamable HTTP transport work — it is not a production service.

What's in here

• WeatherServer (app/Mcp/Servers/WeatherServer.php) — an MCP server registered at /mcp/weather that exposes the get-weather tool and instructs the LLM on when to use it.
• GetWeather (app/Mcp/Tools/GetWeather.php) — a read-only, open-world MCP tool that:
  • Accepts a location (required) and units (metric or imperial, defaults to metric).
  • Geocodes the location via the Open-Meteo Geocoding API.
  • Fetches live current conditions from the Open-Meteo Forecast API.
  • Returns structured content (temperature, apparent temperature, humidity, wind, condition, timezone, etc.) or a friendly error if the location can't be found or the provider is unreachable.
• CrmServer (app/Mcp/Servers/CrmServer.php) — an empty scaffold server (registered at /mcp/crm) kept around for experimenting with a second server/tool set.
• Weather MCP Console (resources/views/mcp-tester.blade.php) — a plain HTML/JS page served at / and /mcp-tester for connecting to the local Streamable HTTP MCP endpoint, discovering its tools, and calling get-weather interactively.
• MCP routes (routes/ai.php) — registers the two servers with Mcp::web(...).

Requirements

• PHP ^8.1
• Composer
• Node.js + npm (for the console's Vite assets)

Setup

composer install
npm install

cp .env.example .env
php artisan key:generate

npm run dev      # or: npm run build
php artisan serve

No database is required to use the weather tool itself, but the default Laravel .env still points at one if you want to run migrations.

Trying it out

1. Start the app with php artisan serve and run npm run dev (or build assets) so the console's JS/CSS are available.
2. Open http://127.0.0.1:8000/ (or /mcp-tester) in a browser.
3. Point MCP endpoint at http://127.0.0.1:8000/mcp/weather and click Connect & discover to list the server's tools.
4. Call get-weather with a location (e.g. Bengaluru) and an optional units value to see a live structured response.

You can also talk to the server directly as an MCP client (e.g. Claude Desktop, Claude Code, or another MCP-compatible client) by pointing it at the /mcp/weather Streamable HTTP endpoint.

Tests

php artisan test

tests/Feature/GetWeatherToolTest.php fakes the Open-Meteo HTTP calls and asserts the tool returns correctly structured weather data.

License

The Laravel framework is open-sourced software licensed under the MIT license.