70 lines
3.1 KiB
C#
70 lines
3.1 KiB
C#
using ModelContextProtocol;
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using ModelContextProtocol.Server;
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using System.ComponentModel;
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using System.Globalization;
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using System.Text.Json;
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namespace ProtectedMcpServer.Tools;
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[McpServerToolType]
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public sealed class WeatherTools
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{
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private readonly IHttpClientFactory _httpClientFactory;
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public WeatherTools(IHttpClientFactory httpClientFactory)
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{
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_httpClientFactory = httpClientFactory;
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}
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[McpServerTool, Description("Get weather alerts for a US state.")]
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public async Task<string> GetAlerts(
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[Description("The US state to get alerts for. Use the 2 letter abbreviation for the state (e.g. NY).")] string state)
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{
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var client = _httpClientFactory.CreateClient("WeatherApi");
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using var jsonDocument = await client.GetFromJsonAsync<JsonDocument>($"/alerts/active/area/{state}")
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?? throw new McpException("No JSON returned from alerts endpoint");
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var alerts = jsonDocument.RootElement.GetProperty("features").EnumerateArray();
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if (!alerts.Any())
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{
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return "No active alerts for this state.";
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}
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return string.Join("\n--\n", alerts.Select(alert =>
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{
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JsonElement properties = alert.GetProperty("properties");
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return $"""
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Event: {properties.GetProperty("event").GetString()}
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Area: {properties.GetProperty("areaDesc").GetString()}
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Severity: {properties.GetProperty("severity").GetString()}
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Description: {properties.GetProperty("description").GetString()}
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Instruction: {properties.GetProperty("instruction").GetString()}
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""";
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}));
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}
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[McpServerTool, Description("Get weather forecast for a location.")]
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public async Task<string> GetForecast(
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[Description("Latitude of the location.")] double latitude,
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[Description("Longitude of the location.")] double longitude)
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{
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var client = _httpClientFactory.CreateClient("WeatherApi");
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var pointUrl = string.Create(CultureInfo.InvariantCulture, $"/points/{latitude},{longitude}");
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using var locationDocument = await client.GetFromJsonAsync<JsonDocument>(pointUrl);
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var forecastUrl = locationDocument?.RootElement.GetProperty("properties").GetProperty("forecast").GetString()
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?? throw new McpException($"No forecast URL provided by {client.BaseAddress}points/{latitude},{longitude}");
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using var forecastDocument = await client.GetFromJsonAsync<JsonDocument>(forecastUrl);
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var periods = forecastDocument?.RootElement.GetProperty("properties").GetProperty("periods").EnumerateArray()
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?? throw new McpException("No JSON returned from forecast endpoint");
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return string.Join("\n---\n", periods.Select(period => $"""
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{period.GetProperty("name").GetString()}
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Temperature: {period.GetProperty("temperature").GetInt32()}°F
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Wind: {period.GetProperty("windSpeed").GetString()} {period.GetProperty("windDirection").GetString()}
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Forecast: {period.GetProperty("detailedForecast").GetString()}
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"""));
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}
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}
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