Module 6: Community Contributions

// McpFinanceTools/StockQuoteTool.cs
using Microsoft.Mcp.Tools;

public class StockQuoteTool : IMcpTool
{
    private readonly HttpClient _httpClient;

    public StockQuoteTool(HttpClient httpClient = null)
    {
        _httpClient = httpClient ?? new HttpClient();
    }

    public string Name => "stockQuote";
    public string Description => "Gets current stock quotes for specified symbols";

    public object GetSchema() => new {
        type = "object",
        properties = new {
            symbol = new { type = "string", description = "Stock symbol (e.g., MSFT)" },
            includeHistory = new { type = "boolean", default = false }
        },
        required = new[] { "symbol" }
    };

    public async Task<ToolResponse> ExecuteAsync(ToolRequest request)
    {
        string symbol = request.Parameters.GetProperty("symbol").GetString();
        var quote = await GetStockQuoteAsync(symbol);
        return new ToolResponse { Result = JsonSerializer.SerializeToElement(quote) };
    }
}

dotnet pack -c Release
dotnet nuget push bin/Release/McpFinanceTools.1.0.0.nupkg \
  -s https://api.nuget.org/v3/index.json -k YOUR_API_KEY

// com.example.mcp.weather.WeatherForecastTool
public class WeatherForecastTool implements Tool {
    private final HttpClient httpClient;
    private final String apiKey;

    public WeatherForecastTool(String apiKey) {
        this.httpClient = HttpClient.newHttpClient();
        this.apiKey = apiKey;
    }

    @Override public String getName() { return "weatherForecast"; }
    @Override public String getDescription() {
        return "Gets weather forecast for a specified location";
    }

    @Override
    public ToolResponse execute(ToolRequest request) {
        String location = request.getParameters().get("location").asText();
        int days = request.getParameters().has("days")
            ? request.getParameters().get("days").asInt() : 3;
        Map<String, Object> forecast = getForecast(location, days);
        return new ToolResponse.Builder().setResult(forecast).build();
    }
}

mvn clean package
mvn deploy