MCP SDK

from mcp.server.fastmcp import FastMCP

# Create an MCP server
mcp = FastMCP("Weather Service")

# Tool implementation
@mcp.tool()
def get_weather(location: str) -> str:
    """Get the current weather for a specified location."""
    return f"Weather in {location}: Sunny, 72°F"

# Resource implementation
@mcp.resource("weather://{location}")
def weather_resource(location: str) -> str:
    """Provide weather data as a resource."""
    return f"Weather data for {location}: Sunny, 72°F"

# Prompt implementation
@mcp.prompt()
def weather_report(location: str) -> str:
    """Create a weather report prompt."""
    return f"""You are a weather reporter. Weather report for {location}?"""


# Run the server
if __name__ == "__main__":
    mcp.run()

mcp dev server.py

// index.mjs
import {
  McpServer,
  ResourceTemplate,
} from "@modelcontextprotocol/sdk/server/mcp.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { z } from "zod";

// Create an MCP server
const server = new McpServer({
  name: "Weather Service",
  version: "1.0.0",
});

// Tool implementation
server.tool("get_weather", { location: z.string() }, async ({ location }) => ({
  content: [
    {
      type: "text",
      text: `Weather in ${location}: Sunny, 72°F`,
    },
  ],
}));

// Resource implementation
server.resource(
  "weather",
  new ResourceTemplate("weather://{location}", { list: undefined }),
  async (uri, { location }) => ({
    contents: [
      {
        uri: uri.href,
        text: `Weather data for ${location}: Sunny, 72°F`,
      },
    ],
  })
);

// Prompt implementation
server.prompt(
  "weather_report",
  { location: z.string() },
  async ({ location }) => ({
    messages: [
      {
        role: "assistant",
        content: {
          type: "text",
          text: "You are a weather reporter.",
        },
      },
      {
        role: "user",
        content: {
          type: "text",
          text: `Weather report for ${location}?`,
        },
      },
    ],
  })
);

// Run the server
const transport = new StdioServerTransport();
await server.connect(transport);

npx @modelcontextprotocol/inspector node ./index.mjs