Your First MCP Tool

Hands-on practice for this lecture. Work through the exercises and quizzes to reinforce what you've learned.

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Interactive Workshop

Build Your First MCP Tool

Create an MCP server from scratch and register your first tool — an add function that sums two numbers.

1

Initialize a Node.js project with the MCP SDK and Zod for schema validation.

jsonpackage.json
1{
2  "name": "my-mcp-server",
3  "version": "1.0.0",
4  "type": "module",
5  "scripts": {
6    "build": "tsc",
7    "start": "node dist/index.js"
8  },
9  "dependencies": {
10    "@modelcontextprotocol/sdk": "^1.0.0",
11    "zod": "^3.22.0"
12  },
13  "devDependencies": {
14    "typescript": "^5.3.0",
15    "@types/node": "^20.0.0"
16  }
17}
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MCP Client
stdio · connectedmy-mcp-server
add

Add two numbers together and return the sum

requirednumber
requirednumber
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Test Your Understanding

Multiple choice — select an answer to see the explanation.

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What is Zod used for in an MCP server?

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