MCP Sample Server

#!/usr/bin/env node import { Server } from "@modelcontextprotocol/sdk/server/index.js"; import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; import { CallToolRequestSchema, ListToolsRequestSchema, ListResourcesRequestSchema, ReadResourceRequestSchema, } from "@modelcontextprotocol/sdk/types.js"; // サンプルデータ const sampleNotes = { "welcome": "Welcome to MCP Sample Server!", "example": "This is an example note.", }; // MCPサーバーの作成 const server = new Server({ name: "mcp-sample-server", version: "1.0.0", }, { capabilities: { tools: {}, resources: {}, }, }); // ツールのリスト定義 server.setRequestHandler(ListToolsRequestSchema, async () => { return { tools: [ { name: "get_current_time", description: "現在の時刻を取得します", inputSchema: { type: "object", properties: { timezone: { type: "string", description: "タイムゾーン (例: Asia/Tokyo, UTC)", }, }, }, }, { name: "calculate", description: "簡単な計算を実行します（加算、減算、乗算、除算）", inputSchema: { type: "object", properties: { operation: { type: "string", enum: ["add", "subtract", "multiply", "divide"], description: "実行する演算", }, a: { type: "number", description: "最初の数値", }, b: { type: "number", description: "2番目の数値", }, }, required: ["operation", "a", "b"], }, }, ], }; }); // ツールの実行 server.setRequestHandler(CallToolRequestSchema, async (request) => { const { name, arguments: args } = request.params; switch (name) { case "get_current_time": { const timezone = args?.timezone || "UTC"; const now = new Date(); const timeString = now.toLocaleString("ja-JP", { timeZone: timezone, year: "numeric", month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit", second: "2-digit", }); return { content: [ { type: "text", text: `現在時刻 (${timezone}): ${timeString}`, }, ], }; } case "calculate": { const { operation, a, b } = args; let result; switch (operation) { case "add": result = a + b; break; case "subtract": result = a - b; break; case "multiply": result = a * b; break; case "divide": if (b === 0) { throw new Error("0で除算できません"); } result = a / b; break; default: throw new Error(`不明な演算: ${operation}`); } return { content: [ { type: "text", text: `計算結果: ${a} ${operation} ${b} = ${result}`, }, ], }; } default: throw new Error(`不明なツール: ${name}`); } }); // リソースのリスト定義 server.setRequestHandler(ListResourcesRequestSchema, async () => { return { resources: Object.keys(sampleNotes).map((key) => ({ uri: `note:///${key}`, name: `Note: ${key}`, mimeType: "text/plain", description: `サンプルノート: ${key}`, })), }; }); // リソースの読み取り server.setRequestHandler(ReadResourceRequestSchema, async (request) => { const uri = request.params.uri; const match = uri.match(/^note:\/\/\/(.+)$/); if (!match) { throw new Error(`無効なURI: ${uri}`); } const noteId = match[1]; const content = sampleNotes[noteId]; if (!content) { throw new Error(`ノートが見つかりません: ${noteId}`); } return { contents: [ { uri, mimeType: "text/plain", text: content, }, ], }; }); // サーバーの起動 async function main() { const transport = new StdioServerTransport(); await server.connect(transport); console.error("MCP Sample Server が起動しました"); } main().catch((error) => { console.error("サーバーエラー:", error); process.exit(1); });