Weather MCP Server

from typing import Any import httpx from mcp.server.fastmcp import FastMCP # Initialize FastMCP server mcp = FastMCP("weather") # Constants NWS_API_BASE="https://api.weather.gov" USER_AGENT = "weather-app/1.0" async def make_nws_request(url: str) -> dict[str, Any] | None: """Make a request to the NWS API with proper error handling""" headers = { "User-Agent": USER_AGENT, "Accept": "application/geo+json" } async with httpx.AsyncClient() as client: try: response = await client.get(url, headers=headers, timeout=30.0) response.raise_for_status() return response.json() except Exception as e: return None def format_alert(feature: dict) -> str: """Format an alert feature into a readable string""" props = feature["properties"] return f""" Event: {props.get("event", "Unknown")} Area: {props.get("areaDesc", "Unknown")} Severity: {props.get("severity", "Unknown")} Description: {props.get("description", "No description available")} Instructions: {props.get("instruction", "No specific instrucy+tion provided")} """ @mcp.tool() async def get_alerts(state: str) -> str: """Get weather alerts for US state Args: state: Two letter US state code (e.g CA, NY etc) """ url = f"{NWS_API_BASE}/alerts/active/area/{state}" data = await make_nws_request(url) if not data or "features" not in data: return "Unable to fetch alerts or no alerts found" if not data.get("features"): return "No active alerts for this state" alerts = [format_alert(feature) for feature in data.get("features")] return "\n--------------\n".join(alerts) @mcp.resource("echo://{message}") def echo_resource(message: str) -> str: """Echo a message as a resource""" return f"Resource echo : {message}"