weather-server.js•15.3 kB
#!/usr/bin/env node
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g = Object.create((typeof Iterator === "function" ? Iterator : Object).prototype);
return g.next = verb(0), g["throw"] = verb(1), g["return"] = verb(2), typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
var index_js_1 = require("@modelcontextprotocol/sdk/server/index.js");
var stdio_js_1 = require("@modelcontextprotocol/sdk/server/stdio.js");
var types_js_1 = require("@modelcontextprotocol/sdk/types.js");
var zod_1 = require("zod");
// Define the server capabilities and information
var server = new index_js_1.Server({
name: 'weather-mcp-server',
version: '1.0.0',
}, {
capabilities: {
tools: {},
},
});
// Constants
var NWS_API_BASE = "https://api.weather.gov";
var USER_AGENT = "weather-app/1.0";
// Schema for get_alerts tool input
var GetAlertsArgsSchema = zod_1.z.object({
state: zod_1.z.string().length(2).describe('Two-letter US state code (e.g. CA, NY)'),
});
// Schema for get_forecast tool input
var GetForecastArgsSchema = zod_1.z.object({
latitude: zod_1.z.number().min(-90).max(90).describe('Latitude of the location'),
longitude: zod_1.z.number().min(-180).max(180).describe('Longitude of the location'),
});
// Helper function for making NWS API requests
function makeNWSRequest(url) {
return __awaiter(this, void 0, void 0, function () {
var headers, response, error_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
headers = {
"User-Agent": USER_AGENT,
"Accept": "application/geo+json",
};
_a.label = 1;
case 1:
_a.trys.push([1, 4, , 5]);
return [4 /*yield*/, fetch(url, { headers: headers })];
case 2:
response = _a.sent();
if (!response.ok) {
throw new Error("HTTP error! status: ".concat(response.status));
}
return [4 /*yield*/, response.json()];
case 3: return [2 /*return*/, _a.sent()];
case 4:
error_1 = _a.sent();
console.error('Error making NWS request:', error_1);
return [2 /*return*/, null];
case 5: return [2 /*return*/];
}
});
});
}
// Format alert data
function formatAlert(feature) {
var props = feature.properties;
return [
"Event: ".concat(props.event || "Unknown"),
"Area: ".concat(props.areaDesc || "Unknown"),
"Severity: ".concat(props.severity || "Unknown"),
"Description: ".concat(props.description || "No description available"),
"Instructions: ".concat(props.instruction || "No specific instructions provided"),
"---",
].join("\n");
}
// List available tools
server.setRequestHandler(types_js_1.ListToolsRequestSchema, function () { return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2 /*return*/, {
tools: [
{
name: 'get_alerts',
description: 'Get weather alerts for a US state',
inputSchema: {
type: 'object',
properties: {
state: {
type: 'string',
description: 'Two-letter US state code (e.g. CA, NY)',
},
},
required: ['state'],
},
},
{
name: 'get_forecast',
description: 'Get weather forecast for a location',
inputSchema: {
type: 'object',
properties: {
latitude: {
type: 'number',
description: 'Latitude of the location',
},
longitude: {
type: 'number',
description: 'Longitude of the location',
},
},
required: ['latitude', 'longitude'],
},
},
],
}];
});
}); });
// Handle tool calls
server.setRequestHandler(types_js_1.CallToolRequestSchema, function (request) { return __awaiter(void 0, void 0, void 0, function () {
var _a, name, args, _b, parsed, stateCode, alertsUrl, alertsData, features, formattedAlerts, alertsText, parsed, pointsUrl, pointsData, forecastUrl, forecastData, periods, formattedForecast, forecastText, error_2, errorMessage;
var _c, _d;
return __generator(this, function (_e) {
switch (_e.label) {
case 0:
_a = request.params, name = _a.name, args = _a.arguments;
_e.label = 1;
case 1:
_e.trys.push([1, 9, , 10]);
_b = name;
switch (_b) {
case 'get_alerts': return [3 /*break*/, 2];
case 'get_forecast': return [3 /*break*/, 4];
}
return [3 /*break*/, 7];
case 2:
parsed = GetAlertsArgsSchema.parse(args);
stateCode = parsed.state.toUpperCase();
alertsUrl = "".concat(NWS_API_BASE, "/alerts?area=").concat(stateCode);
return [4 /*yield*/, makeNWSRequest(alertsUrl)];
case 3:
alertsData = _e.sent();
if (!alertsData) {
return [2 /*return*/, {
content: [
{
type: 'text',
text: 'Failed to retrieve alerts data',
},
],
}];
}
features = alertsData.features || [];
if (features.length === 0) {
return [2 /*return*/, {
content: [
{
type: 'text',
text: "No active alerts for ".concat(stateCode),
},
],
}];
}
formattedAlerts = features.map(formatAlert);
alertsText = "Active alerts for ".concat(stateCode, ":\n\n").concat(formattedAlerts.join("\n"));
return [2 /*return*/, {
content: [
{
type: 'text',
text: alertsText,
},
],
}];
case 4:
parsed = GetForecastArgsSchema.parse(args);
pointsUrl = "".concat(NWS_API_BASE, "/points/").concat(parsed.latitude.toFixed(4), ",").concat(parsed.longitude.toFixed(4));
return [4 /*yield*/, makeNWSRequest(pointsUrl)];
case 5:
pointsData = _e.sent();
if (!pointsData) {
return [2 /*return*/, {
content: [
{
type: 'text',
text: "Failed to retrieve grid point data for coordinates: ".concat(parsed.latitude, ", ").concat(parsed.longitude, ". This location may not be supported by the NWS API (only US locations are supported)."),
},
],
}];
}
forecastUrl = (_c = pointsData.properties) === null || _c === void 0 ? void 0 : _c.forecast;
if (!forecastUrl) {
return [2 /*return*/, {
content: [
{
type: 'text',
text: 'Failed to get forecast URL from grid point data',
},
],
}];
}
return [4 /*yield*/, makeNWSRequest(forecastUrl)];
case 6:
forecastData = _e.sent();
if (!forecastData) {
return [2 /*return*/, {
content: [
{
type: 'text',
text: 'Failed to retrieve forecast data',
},
],
}];
}
periods = ((_d = forecastData.properties) === null || _d === void 0 ? void 0 : _d.periods) || [];
if (periods.length === 0) {
return [2 /*return*/, {
content: [
{
type: 'text',
text: 'No forecast periods available',
},
],
}];
}
formattedForecast = periods.slice(0, 5).map(function (period) {
return [
"".concat(period.name || "Unknown", ":"),
"Temperature: ".concat(period.temperature || "Unknown", "\u00B0").concat(period.temperatureUnit || "F"),
"Wind: ".concat(period.windSpeed || "Unknown", " ").concat(period.windDirection || ""),
"".concat(period.shortForecast || "No forecast available"),
"---",
].join("\n");
});
forecastText = "Forecast for ".concat(parsed.latitude, ", ").concat(parsed.longitude, ":\n\n").concat(formattedForecast.join("\n"));
return [2 /*return*/, {
content: [
{
type: 'text',
text: forecastText,
},
],
}];
case 7: throw new Error("Unknown tool: ".concat(name));
case 8: return [3 /*break*/, 10];
case 9:
error_2 = _e.sent();
errorMessage = error_2 instanceof Error ? error_2.message : 'Unknown error occurred';
return [2 /*return*/, {
content: [
{
type: 'text',
text: "Error: ".concat(errorMessage),
},
],
isError: true,
}];
case 10: return [2 /*return*/];
}
});
}); });
// Error handling
process.on('SIGINT', function () { return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, server.close()];
case 1:
_a.sent();
process.exit(0);
return [2 /*return*/];
}
});
}); });
process.on('SIGTERM', function () { return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, server.close()];
case 1:
_a.sent();
process.exit(0);
return [2 /*return*/];
}
});
}); });
// Start the server
function main() {
return __awaiter(this, void 0, void 0, function () {
var transport;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
transport = new stdio_js_1.StdioServerTransport();
return [4 /*yield*/, server.connect(transport)];
case 1:
_a.sent();
// Log to stderr so it doesn't interfere with stdio communication
console.error('Weather MCP Server running on stdio');
return [2 /*return*/];
}
});
});
}
main().catch(function (error) {
console.error('Fatal error in main():', error);
process.exit(1);
});