generic-mcp-server

#!/usr/bin/env node import { Server } from "@modelcontextprotocol/sdk/server/index.js"; import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; import { CallToolRequestSchema, ErrorCode, ListResourcesRequestSchema, ListToolsRequestSchema, McpError, ReadResourceRequestSchema, } from "@modelcontextprotocol/sdk/types.js"; import { zodToJsonSchema } from "zod-to-json-schema"; import { TOOLS } from "./tools.js"; import { RESOURCES } from "./resources.js"; /** * Create an MCP server with capabilities for resources (to list/read data) * and tools (to execute code). */ const server = new Server( { name: "generic-mcp-server", version: "0.1.0", }, { capabilities: { resources: {}, tools: {}, }, } ); /** * Handler for listing available resources */ server.setRequestHandler(ListResourcesRequestSchema, async () => { return { resources: Object.values(RESOURCES).map((resource) => ({ uri: resource.uri, mimeType: resource.mimeType, name: resource.name, description: resource.description, })), }; }); /** * Handler for reading the contents of a specific resource */ server.setRequestHandler(ReadResourceRequestSchema, async (request) => { const resource = Object.values(RESOURCES).find( (r) => r.uri === request.params.uri ); if (!resource) { throw new McpError( ErrorCode.InvalidRequest, `Resource not found: ${request.params.uri}` ); } return resource.handler(); }); /** * Handler for listing available tools */ server.setRequestHandler(ListToolsRequestSchema, async () => { return { tools: Object.entries(TOOLS).map(([name, tool]) => ({ name, description: tool.description, inputSchema: zodToJsonSchema(tool.inputSchema), })), }; }); /** * Handler for calling a tool */ server.setRequestHandler(CallToolRequestSchema, async (request) => { const toolName = request.params.name; const tool = TOOLS[toolName as keyof typeof TOOLS]; if (!tool) { throw new McpError( ErrorCode.MethodNotFound, `Unknown tool: ${toolName}` ); } try { const args = tool.inputSchema.parse(request.params.arguments); // eslint-disable-next-line @typescript-eslint/no-explicit-any return await tool.handler(args as any); } catch (error) { if (error instanceof Error) { throw new McpError( ErrorCode.InvalidParams, `Invalid arguments: ${error.message}` ); } throw error; } }); /** * Start the server using stdio transport. * This allows the server to communicate via standard input/output streams. */ async function main() { const transport = new StdioServerTransport(); await server.connect(transport); console.error("Generic MCP Server running on stdio"); } main().catch((error) => { console.error("Server error:", error); process.exit(1); });