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.
npxskills add shareAI-lab/learn-claude-code--skill mcp-builderLoading…
You now have expertise in building MCP (Model Context Protocol) servers. MCP enables Claude to interact with external services through a standardized protocol.
MCP servers expose:
# Create project
mkdir my-mcp-server && cd my-mcp-server
python3 -m venv venv && source venv/bin/activate
# Install MCP SDK
pip install mcp
#!/usr/bin/env python3
"""my_server.py - A simple MCP server"""
from mcp.server import Server
from mcp.server.stdio import stdio_server
from mcp.types import Tool, TextContent
# Create server instance
server = Server("my-server")
# Define a tool
@server.tool()
async def hello(name: str) -> str:
"""Say hello to someone.
Args:
name: The name to greet
"""
return f"Hello, {name}!"
@server.tool()
async def add_numbers(a: int, b: int) -> str:
"""Add two numbers together.
Args:
a: First number
b: Second number
"""
return str(a + b)
# Run server
async def main():
async with stdio_server() as (read, write):
await server.run(read, write)
if __name__ == "__main__":
import asyncio
asyncio.run(main())
Add to ~/.claude/mcp.json:
{
"mcpServers": {
"my-server": {
"command": "python3",
"args": ["/path/to/my_server.py"]
}
}
}
mkdir my-mcp-server && cd my-mcp-server
npm init -y
npm install @modelcontextprotocol/sdk
// src/index.ts
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",
});
// Define tools
server.setRequestHandler("tools/list", async () => ({
tools: [
{
name: "hello",
description: "Say hello to someone",
inputSchema: {
type: "object",
properties: {
name: { type: "string", description: "Name to greet" },
},
required: ["name"],
},
},
],
}));
server.setRequestHandler("tools/call", async (request) => {
if (request.params.name === "hello") {
const name = request.params.arguments.name;
return { content: [{ type: "text", text: `Hello, ${name}!` }] };
}
throw new Error("Unknown tool");
});
// Start server
const transport = new StdioServerTransport();
server.connect(transport);
import httpx
from mcp.server import Server
server = Server("weather-server")
@server.tool()
async def get_weather(city: str) -> str:
"""Get current weather for a city."""
async with httpx.AsyncClient() as client:
resp = await client.get(
f"https://api.weatherapi.com/v1/current.json",
params={"key": "YOUR_API_KEY", "q": city}
)
data = resp.json()
return f"{city}: {data['current']['temp_c']}C, {data['current']['condition']['text']}"
import sqlite3
from mcp.server import Server
server = Server("db-server")
@server.tool()
async def query_db(sql: str) -> str:
"""Execute a read-only SQL query."""
if not sql.strip().upper().startswith("SELECT"):
return "Error: Only SELECT queries allowed"
conn = sqlite3.connect("data.db")
cursor = conn.execute(sql)
rows = cursor.fetchall()
conn.close()
return str(rows)
@server.resource("config://settings")
async def get_settings() -> str:
"""Application settings."""
return open("settings.json").read()
@server.resource("file://{path}")
async def read_file(path: str) -> str:
"""Read a file from the workspace."""
return open(path).read()
# Test with MCP Inspector
npx @anthropics/mcp-inspector python3 my_server.py
# Or send test messages directly
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' | python3 my_server.py
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