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Lesson 4: Build an MCP Server
TypeScript
📖 Concept

An MCP (Model Context Protocol) server exposes tools that AI models can call. Each tool has a name, description, and an execute handler that runs your logic.

Key insight

The server.tool() method registers a callable tool — the AI sees its name & schema, then invokes your handler with validated params.

weather-server.ts
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; const server = new ________({ name: "weather", version: "1.0.0" }); server.________("get-forecast", { city: z.string() }, async ({ city }) => { const data = await fetchWeather(city); return { content: [{ type: "text", text: data }] }; } );
Instantiate the MCP server
Register a callable tool
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