How to install the MCP TypeScript SDK

1#!/usr/bin/env node
2
3import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
4import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
5import { z } from "zod";
6
7// Create the MCP server
8const server = new McpServer({
9  name: "my-mcp-server",
10  version: "1.0.0",
11});
12
13// Define a tool with Zod input validation
14server.tool(
15  "hello",
16  "Greet someone by name",
17  { name: z.string().describe("Name of the person to greet") },
18  async ({ name }) => ({
19    content: [
20      {
21        type: "text",
22        text: `Hello, ${name}! This response comes from an MCP server.`,
23      },
24    ],
25  })
26);
27
28// Define a tool with multiple parameters
29server.tool(
30  "calculate",
31  "Perform basic arithmetic",
32  {
33    a: z.number().describe("First number"),
34    b: z.number().describe("Second number"),
35    operation: z.enum(["add", "subtract", "multiply", "divide"]),
36  },
37  async ({ a, b, operation }) => {
38    let result: number;
39    switch (operation) {
40      case "add": result = a + b; break;
41      case "subtract": result = a - b; break;
42      case "multiply": result = a * b; break;
43      case "divide":
44        if (b === 0) {
45          return {
46            content: [{ type: "text", text: "Error: Division by zero" }],
47            isError: true,
48          };
49        }
50        result = a / b;
51        break;
52    }
53    return {
54      content: [{ type: "text", text: `${a} ${operation} ${b} = ${result}` }],
55    };
56  }
57);
58
59// Connect via stdio
60const transport = new StdioServerTransport();
61await server.connect(transport);
62console.error("my-mcp-server started successfully");