MCP Builder

from fastmcp import FastMCP
import httpx

mcp = FastMCP('weather-server')

@mcp.tool()
async def get_weather(city: str) -> dict:
    """Get current weather for a city."""
    async with httpx.AsyncClient() as client:
        response = await client.get(
            f'https://api.weather.com/v1/current',
            params={'city': city}
        )
        return response.json()

if __name__ == '__main__':
    mcp.run()

from fastmcp import FastMCP
from fastmcp.exceptions import ToolError

mcp = FastMCP('my-server')

@mcp.tool()
async def fetch_data(id: str) -> dict:
    if not id:
        raise ToolError('ID is required')
    
    try:
        result = await database.get(id)
        if not result:
            raise ToolError(f'No data found for ID: {id}')
        return result
    except ConnectionError:
        raise ToolError('Database connection failed')