Program.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using ModelContextProtocol.Server;
using Serilog;

namespace ThinkMCP;

/// <summary>
/// ThinkMCP Server - A Model Context Protocol server providing the 'think' tool
/// for model reasoning and thought logging.
/// </summary>
public class Program
{
    public static async Task Main(string[] args)
    {
        // Set up logging directory
        var logDirectory = Path.Combine(Path.GetTempPath(), "mcp", "think");
        Directory.CreateDirectory(logDirectory);
        var logFileName = Path.Combine(logDirectory, $"think-mcp-{DateTime.Now:yyyyMMdd-HHmmss}.log");
        
        // Configure Serilog
        Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Information()
            .WriteTo.Console(outputTemplate: "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}")
            .WriteTo.File(logFileName, 
                outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}")
            .CreateLogger();

        var builder = Host.CreateApplicationBuilder(args);
        
        // Configure logging to stderr (as recommended by MCP SDK)
        builder.Logging.ClearProviders();
        builder.Logging.AddConsole(options =>
        {
            // All logs go to stderr so they appear in the MCP client
            options.LogToStandardErrorThreshold = LogLevel.Trace;
        });
        
        // Add Serilog
        builder.Services.AddSerilog();
        
        // Configure MCP Server
        builder.Services
            .AddMcpServer()
            .WithStdioServerTransport()
            .WithToolsFromAssembly(); // This will discover our ThinkTool automatically
        
        var host = builder.Build();
        
        // Log server startup
        var logger = host.Services.GetRequiredService<ILogger<Program>>();
        logger.LogInformation("ThinkMCP Server starting up...");
        logger.LogInformation("Thought logs will be stored in: {LogPath}", logFileName);
        
        try
        {
            await host.RunAsync();
        }
        finally
        {
            Log.CloseAndFlush();
        }
    }
}