weather-server MCP Server

MCP-server

This is a TypeScript-based MCP server that implements a simple notes system. It demonstrates core MCP concepts by providing:

• Resources representing text notes with URIs and metadata
• Tools for creating new notes
• Prompts for generating summaries of notes

Features

Resources

• List and access notes via note:// URIs
• Each note has a title, content and metadata
• Plain text mime type for simple content access

Tools

• create_note - Create new text notes
  • Takes title and content as required parameters
  • Stores note in server state

Prompts

• summarize_notes - Generate a summary of all stored notes
  • Includes all note contents as embedded resources
  • Returns structured prompt for LLM summarization

How the Weather Server Works with LLMs

The weather-server uses the Model Context Protocol (MCP) to enhance LLM interactions by providing structured weather data. Here's how it works:

graph TD
    A[User] -->|Weather Query| B[Claude/LLM]
    B -->|Activates| C[Weather MCP Server]
    
    subgraph Weather Server
        C -->|Request| D[Weather API Client]
        D -->|Fetch Data| E[Weather API]
        E -->|Response| D
        D -->|Format Data| C
        F[Cache] <-->|Store/Retrieve| D
    end
    
    C -->|Structured Data| B
    B -->|Natural Response| A
    
    style Weather Server fill:#f0f0f0,stroke:#333,stroke-width:2px
    style B fill:#e1f5fe
    style E fill:#fff59d

Process Flow:

1. Initial Query: User asks the LLM about weather conditions
2. MCP Detection: LLM recognizes weather-related query and activates the MCP server
3. Data Retrieval: Weather server fetches relevant weather data
4. Context Enhancement: Server provides structured weather data back to LLM
5. Response Generation: LLM uses enhanced context to provide accurate weather information

Tools Integration

• Weather data is provided through MCP tools like get_weather and get_forecast
• Each tool returns structured JSON data that the LLM can easily interpret
• Historical data is cached for efficient responses

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "weather-server": {
      "command": "/path/to/weather-server/build/index.js"
    }
  }
}

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.