import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import {
CallToolRequestSchema,
ListToolsRequestSchema,
} from "@modelcontextprotocol/sdk/types.js";
import { z } from "zod";
// MCP サーバーを作成
const server = new Server(
{
name: "mcp-line-server",
version: "1.0.0",
},
{
capabilities: {
tools: {},
},
}
);
// ツール一覧を返す
server.setRequestHandler(ListToolsRequestSchema, async () => {
return {
tools: [
{
name: "add",
description: "Add two numbers and return the result",
inputSchema: {
type: "object",
properties: {
a: {
type: "number",
description: "The first number",
},
b: {
type: "number",
description: "The second number",
},
},
required: ["a", "b"],
},
},
],
};
});
// ツールを実行する
server.setRequestHandler(CallToolRequestSchema, async (request) => {
const { name, arguments: args } = request.params;
if (name === "add") {
// zod でパラメータをバリデーション
const argsSchema = z.object({
a: z.number(),
b: z.number(),
});
const { a, b } = argsSchema.parse(args);
// 足し算を実行
const result = a + b;
return {
content: [
{
type: "text",
text: `${a} + ${b} = ${result}`,
},
],
};
}
throw new Error(`Unknown tool: ${name}`);
});
// サーバーを起動
async function main() {
const transport = new StdioServerTransport();
await server.connect(transport);
console.error("MCP server running on stdio");
}
main().catch((error) => {
console.error("Fatal error:", error);
process.exit(1);
});
