mcp-builder

name	mcp-builder
description	Build MCP (Model Context Protocol) servers that give Claude new capabilities. Use when user wants to create an MCP server, add tools to Claude, or integrate external services.

MCP Server Building Skill

You now have expertise in building MCP (Model Context Protocol) servers. MCP enables Claude to interact with external services through a standardized protocol.

What is MCP?

MCP servers expose:

• Tools: Functions Claude can call
• Resources: Data Claude can read
• Prompts: Pre-built prompt templates

Quick Start: Python MCP Server

from mcp.server import Server
from mcp.server.stdio import stdio_server

server = Server("my-server")

@server.tool()
async def hello(name: str) -> str:
    return f"Hello, {name}!"

TypeScript MCP Server

import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";

const server = new Server({ name: "my-server", version: "1.0.0" });
const transport = new StdioServerTransport();
server.connect(transport);

Best Practices

1. Clear tool descriptions
2. Input validation
3. Meaningful error handling
4. Async for I/O
5. Security first
6. Idempotent tools when possible