mcp-flyin

# My JavaScript MCP Server A Model Context Protocol (MCP) server built with JavaScript that provides basic tools and resources. ## Features ### Tools - **echo**: Echo back any message - **calculate**: Perform basic arithmetic operations (add, subtract, multiply, divide) - **get_system_info**: Get basic system information ### Resources - **package.json**: Access to the server's package configuration ## Installation 1. Make sure you have Node.js installed 2. Install dependencies: ```bash npm install ``` ## Usage ### Running the Server ```bash npm start ``` ### Development Mode ```bash npm run dev ``` ### Testing with MCP Inspector You can test your server using the MCP Inspector: ```bash npx @modelcontextprotocol/inspector node server.js ``` ## Configuration This server runs on stdio transport, which means it communicates through standard input/output. This is the most common way to run MCP servers. ## Example Usage Once connected to an MCP client, you can: 1. **Echo a message**: - Tool: `echo` - Parameters: `{"message": "Hello, World!"}` 2. **Perform calculations**: - Tool: `calculate` - Parameters: `{"operation": "add", "a": 5, "b": 3}` 3. **Get system information**: - Tool: `get_system_info` - Parameters: `{}` 4. **Read resources**: - Resource: `file://package.json` ## Extending the Server To add new tools or resources: 1. Add tool definitions to the `ListToolsRequestSchema` handler 2. Add tool logic to the `CallToolRequestSchema` handler 3. Add resource definitions to the `ListResourcesRequestSchema` handler 4. Add resource reading logic to the `ReadResourceRequestSchema` handler ## Error Handling The server includes proper error handling for: - Division by zero in calculations - Unknown tools and resources - File reading errors - Graceful shutdown on SIGINT