Dynamic library-less MCP server to support use as a plugin (without ASP.net hosting required)

I ended up writing this as the primary MCP library from https://modelcontextprotocol.io/ tends to require ASP.net core hosting. Because of this requirement you are unable to embed that functionality very easily into a DLL that is used for a plugin. I build this POC server that supports .NET framework (not core) so AI can be easily integrated into any application plugin.

using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;
using System.Web.Script.Serialization;
using System.Windows.Forms;
using static MCPHttpServerDotNetFramework.Form1;

namespace DotNetPlugin
{
    partial class Plugin
    {
        [Command("Booltestcmd")]
        public static bool testcmd(bool boolargs)
        {
            Console.WriteLine("testcmd!");
            return boolargs;
        }

        [Command("stringTestcmder")]
        public static string testcmder(string stringargs)
        {
            Console.WriteLine("testcmder!");
            return stringargs;
        }

        [Command("StrArraytestcmder")]
        public static string[] arraytestcmder(string[] args) //"Uses pipes to delimit arrays
        {
            Console.WriteLine("arraytestcmder!");
            return args;
        }

    }
}

namespace MCPHttpServerDotNetFramework
{
    public partial class Form1: Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Replace Plugin with your actual class type
            var server = new SimpleMcpServer(typeof(DotNetPlugin.Plugin));
            server.Start();
            Console.ReadLine(); // Keep it running
        }


        [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
        public class CommandAttribute : Attribute
        {
            public string Name { get; }
            public bool DebugOnly { get; set; }

            public CommandAttribute(string name)
            {
                Name = name;
            }
        }
    }








    public class SimpleMcpServer
    {
        private readonly HttpListener _listener = new HttpListener();
        private readonly Dictionary<string, MethodInfo> _commands = new Dictionary<string, MethodInfo>(StringComparer.OrdinalIgnoreCase);
        private readonly Type _targetType;

        public SimpleMcpServer(Type commandSourceType)
        {
            //DisableServerHeader(); //Prob not needed
            _targetType = commandSourceType;
            _listener.Prefixes.Add("http://localhost:3001/sse/"); //Request come in without a trailing '/' but are still handled
            _listener.Prefixes.Add("http://localhost:3001/message/");

            // Reflect and register [Command] methods
            foreach (var method in commandSourceType.GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic))
            {
                var attr = method.GetCustomAttribute<CommandAttribute>();
                if (attr != null)
                    _commands[attr.Name] = method;
            }
        }

        public static void DisableServerHeader()
        {
            const string keyPath = @"SYSTEM\CurrentControlSet\Services\HTTP\Parameters";
            const string valueName = "DisableServerHeader";
            const int desiredValue = 2;

            try
            {
                using (var key = Registry.LocalMachine.CreateSubKey(keyPath, true))
                {
                    if (key == null)
                    {
                        Console.WriteLine("Failed to open or create the registry key.");
                        return;
                    }

                    var currentValue = key.GetValue(valueName);
                    if (currentValue == null || (int)currentValue != desiredValue)
                    {
                        key.SetValue(valueName, desiredValue, RegistryValueKind.DWord);
                        Console.WriteLine("Registry value updated. Restarting HTTP service...");

                        RestartHttpService();
                    }
                    else
                    {
                        Console.WriteLine("DisableServerHeader is already set to 2. No changes made.");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error modifying registry: " + ex.Message);
            }
        }

        private static void RestartHttpService()
        {
            try
            {
                ExecuteCommand("net stop http");
                ExecuteCommand("net start http");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed to restart HTTP service. Try rebooting manually. Error: " + ex.Message);
            }
        }

        private static void ExecuteCommand(string command)
        {
            var process = new Process
            {
                StartInfo = new ProcessStartInfo("cmd.exe", "/c " + command)
                {
                    Verb = "runas", // Run as administrator
                    CreateNoWindow = true,
                    UseShellExecute = true,
                    WindowStyle = ProcessWindowStyle.Hidden
                }
            };
            process.Start();
            process.WaitForExit();
        }

        public void Start()
        {
            _listener.Start();
            Console.WriteLine("MCP server running");
            _listener.BeginGetContext(OnRequest, null);
        }

        private static readonly Dictionary<string, StreamWriter> _sseSessions = new Dictionary<string, StreamWriter>();

        private async void OnRequest(IAsyncResult ar) // Make async void for simplicity here, consider Task for robustness
        {
            HttpListenerContext ctx = _listener.EndGetContext(ar);
            _listener.BeginGetContext(OnRequest, null); // loop

            Console.WriteLine("=== Incoming Request ===");
            Console.WriteLine($"Method: {ctx.Request.HttpMethod}");
            Console.WriteLine($"URL: {ctx.Request.Url}");
            Console.WriteLine($"Headers:");
            foreach (string key in ctx.Request.Headers)
            {
                Console.WriteLine($"  {key}: {ctx.Request.Headers[key]}");
            }

            string requestBody = null; // Variable to store the body
            Console.WriteLine("=========================");

            ctx.Response.Headers["Server"] = "Kestrel";

            if (ctx.Request.HttpMethod == "POST")
            {
                var path = ctx.Request.Url.AbsolutePath.ToLowerInvariant();

                if (path.StartsWith("/message"))
                {
                    var query = ctx.Request.QueryString["sessionId"];
                    if (string.IsNullOrWhiteSpace(query) || !_sseSessions.ContainsKey(query))
                    {
                        ctx.Response.StatusCode = 400;
                        ctx.Response.OutputStream.Close();
                        return;
                    }

                    using (var reader = new StreamReader(ctx.Request.InputStream))
                    {
                        var jsonBody = reader.ReadToEnd();

                        if (ctx.Request.HasEntityBody)
                        {
                            Console.WriteLine("Body:");
                            Console.WriteLine(jsonBody);
                        }
                        else
                        {
                            Console.WriteLine("No body.");
                        }

                        var json = new JavaScriptSerializer().Deserialize<Dictionary<string, object>>(jsonBody);

                        string method = json["method"]?.ToString();
                        var @params = json.ContainsKey("params") ? json["params"] as object[] : null;

                        if (method == "rpc.discover")
                        {
                            var toolList = new List<object>();
                            foreach (var cmd in _commands)
                            {
                                toolList.Add(new
                                {
                                    name = cmd.Key,
                                    parameters = new[] { "string[]" }
                                });
                            }

                            var response = new
                            {
                                jsonrpc = "2.0",
                                id = json["id"],
                                result = toolList
                            };

                            var sseData = new JavaScriptSerializer().Serialize(response);

                            lock (_sseSessions)
                            {
                                var writer = _sseSessions[query];
                                writer.Write($"id: {json["id"]}\n");
                                writer.Write($"data: {sseData}\n\n");
                                writer.Flush();
                            }

                            ctx.Response.StatusCode = 202;
                            ctx.Response.Close();
                        }
                        else if (method == "initialize")
                        {

                            //POST / message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP / 1.1
                            //Host: localhost: 3001
                            //Content-Type: application/json; charset=utf-8
                            //Content-Length: 202

                            //{ "jsonrpc":"2.0","id":"7b9343b583174f88bf926c1341bdf2a3-1","method":"initialize","params":{ "protocolVersion":"2024-11-05","capabilities":{ },"clientInfo":{ "name":"QuickstartClient","version":"1.0.0.0"} } }
                            //                            HTTP / 1.1 202 Accepted
                            //                            Date: Wed, 02 Apr 2025 03:44:44 GMT
                            //                            Server: Kestrel
                            //Transfer - Encoding: chunked

                            //Accepted
                            ctx.Response.SendChunked = true;
                            ctx.Response.StatusCode = 202;
                            //ctx.Response.ContentType = "text/plain; charset=utf-8";
                            using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))
                            {
                                
                                responseWriter.Write($"Accepted");
                                responseWriter.Flush();

                                try
                                {
                                    var discoverResponse = new JavaScriptSerializer().Serialize(new
                                    {
                                        jsonrpc = "2.0",
                                        id = json["id"],
                                        result = new
                                        {
                                            protocolVersion = "2024-11-05",
                                            capabilities = new { tools = new { } },
                                            serverInfo = new { name = "AspNetCoreSseServer", version = "1.0.0.0" },
                                            instructions = ""
                                        }
                                    });

                                    StreamWriter writer;
                                    lock (_sseSessions)
                                    {
                                        writer = _sseSessions[query];
                                        writer.Write($"data: {discoverResponse}\n\n");
                                        writer.Flush();
                                    }

                                    Debug.WriteLine("Responding with Session:" + query);
                                }
                                catch (Exception ex)
                                {
                                    Console.WriteLine($"SSE connection error: {ex.Message}");
                                }
                                finally
                                {
                                    //lock (_sseSessions)
                                    //    _sseSessions.Remove(sessionId);
                                    //ctx.Response.Close();
                                }
                                //responseWriter.Write("Accepted");
                                //responseWriter.Flush();
                                //responseWriter.Close();
                                // Don't close the writer or ctx.Response — keep it open for future use
                                //await Task.Delay(-1); // keep this handler alive forever (or until cancelled)
                            }
                        }
                        else if (method == "notifications/initialized")
                        {

                            //POST / message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP / 1.1
                            //Host: localhost: 3001
                            //Content-Type: application/json; charset=utf-8
                            //Content-Length: 202

                            //{ "jsonrpc":"2.0","id":"7b9343b583174f88bf926c1341bdf2a3-1","method":"initialize","params":{ "protocolVersion":"2024-11-05","capabilities":{ },"clientInfo":{ "name":"QuickstartClient","version":"1.0.0.0"} } }
                            //                            HTTP / 1.1 202 Accepted
                            //                            Date: Wed, 02 Apr 2025 03:44:44 GMT
                            //                            Server: Kestrel
                            //Transfer - Encoding: chunked

                            //Accepted
                            ctx.Response.SendChunked = true;
                            ctx.Response.StatusCode = 202;
                            //ctx.Response.ContentType = "text/plain; charset=utf-8";
                            using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))
                            {
                                responseWriter.Write("Accepted");
                                responseWriter.BaseStream.Flush();
                            }
                        }
                        else if (method == "tools/list")
                        {
                            //POST /message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP/1.1
                            //Host: localhost: 3001
                            //Content-Type: application/json; charset=utf-8
                            //Content-Length: 202
                            //{"jsonrpc":"2.0","id":"d95cc745587346b4bf7df2b13ec0890a-2","method":"tools/list"}
                            //Accepted
                            ctx.Response.SendChunked = true;
                            ctx.Response.StatusCode = 202;
                            //ctx.Response.ContentType = "text/plain; charset=utf-8";
                            using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))
                            {
                                responseWriter.Write("Accepted");
                                responseWriter.BaseStream.Flush();
                            }
                            try
                            {
                                // Dynamically get all Command methods
                                var toolsList = new List<object>();

                                // Use _commands dictionary which should contain all registered commands
                                foreach (var command in _commands)
                                {
                                    string commandName = command.Key;
                                    MethodInfo methodInfo = command.Value;

                                    // Get the Command attribute to access its properties
                                    var attribute = methodInfo.GetCustomAttribute<CommandAttribute>();
                                    if (attribute != null && (!attribute.DebugOnly || Debugger.IsAttached))
                                    {
                                        // Get parameter info for the method
                                        var parameters = methodInfo.GetParameters();
                                        var properties = new Dictionary<string, object>();
                                        var required = new List<string>();

                                        foreach (var param in parameters)
                                        {
                                            string paramName = param.Name;
                                            string paramType = GetJsonSchemaType(param.ParameterType);

                                            properties[paramName] = new
                                            {
                                                type = paramType,
                                                description = $"Parameter for {commandName}"
                                            };

                                            if (!param.IsOptional)
                                            {
                                                required.Add(paramName);
                                            }
                                        }

                                        // Create the tool definition
                                        var tool = new
                                        {
                                            name = commandName,
                                            description = $"Command: {commandName}",
                                            inputSchema = new
                                            {
                                                title = commandName,
                                                description = $"Command: {commandName}",
                                                type = "object",
                                                properties = properties,
                                                required = required.ToArray()
                                            }
                                        };

                                        toolsList.Add(tool);
                                    }
                                }

                                // Add the default tools for Diag
                                toolsList.Add(
                                    new
                                    {
                                        name = "Echo",
                                        description = "Echoes the input back to the client.",
                                        inputSchema = new
                                        {
                                            title = "Echo",
                                            description = "Echoes the input back to the client.",
                                            type = "object",
                                            properties = new
                                            {
                                                message = new
                                                {
                                                    type = "string"
                                                }
                                            },
                                            required = new[] { "message" }
                                        }
                                    }
                                );

                                var discoverResponse = new JavaScriptSerializer().Serialize(new
                                {
                                    jsonrpc = "2.0",
                                    id = json["id"],
                                    result = new
                                    {
                                        tools = toolsList.ToArray()
                                    }
                                });

                                StreamWriter writer;
                                lock (_sseSessions)
                                {
                                    writer = _sseSessions[query];
                                    writer.Write($"data: {discoverResponse}\n\n");
                                    writer.Flush();
                                }
                                Debug.WriteLine("Responding with Session:" + query);
                            }
                            catch (Exception ex)
                            {
                                Console.WriteLine($"SSE connection error: {ex.Message}");
                            }
                            finally
                            {
                                //lock (_sseSessions)
                                //    _sseSessions.Remove(sessionId);
                                //ctx.Response.Close();
                            }
                        }
                        else if (method == "tools/call")
                        {
                            //POST / message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP / 1.1
                            //Host: localhost: 3001
                            //Content-Type: application/json; charset=utf-8
                            //Content-Length: 202
                            //{ "jsonrpc":"2.0","id":"d95cc745587346b4bf7df2b13ec0890a-3","method":"tools/call","params":{ "name":"Echo","arguments":{ "message":"tesrt"} } }
                            //Accepted
                            ctx.Response.SendChunked = true;
                            ctx.Response.StatusCode = 202;
                            //ctx.Response.ContentType = "text/plain; charset=utf-8";
                            using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))
                            {
                                responseWriter.Write("Accepted");
                                responseWriter.BaseStream.Flush();
                            }
                            try
                            {
                                Debug.WriteLine("Params: " + json["params"]);

                                string toolName = null;
                                Dictionary<string, object> arguments = null;
                                string resultText = null;
                                bool isError = false;

                                try
                                {
                                    // JavaScriptSerializer likely returns Dictionary<string, object> 
                                    // rather than a strongly typed object, so use dictionary access
                                    var paramsDict = json["params"] as Dictionary<string, object>;
                                    if (paramsDict != null && paramsDict.ContainsKey("name"))
                                    {
                                        toolName = paramsDict["name"].ToString();

                                        if (paramsDict.ContainsKey("arguments"))
                                        {
                                            arguments = paramsDict["arguments"] as Dictionary<string, object>;
                                        }
                                    }

                                    if (toolName == null || arguments == null)
                                    {
                                        throw new ArgumentException("Invalid request format: missing name or arguments");
                                    }

                                    // Handle Echo command specially
                                    if (toolName == "Echo")
                                    {
                                        // Get the message using dictionary access
                                        if (arguments.ContainsKey("message"))
                                        {
                                            var message = arguments["message"]?.ToString();
                                            resultText = "hello " + message;
                                        }
                                        else
                                        {
                                            throw new ArgumentException("Echo command requires a 'message' argument");
                                        }
                                    }
                                    // Dynamically invoke registered commands
                                    else if (_commands.TryGetValue(toolName, out var methodInfo))
                                    {
                                        try
                                        {
                                            // Get parameter info for the method
                                            var parameters = methodInfo.GetParameters();
                                            var paramValues = new object[parameters.Length];

                                            // Build parameters for the method call
                                            for (int i = 0; i < parameters.Length; i++)
                                            {
                                                var param = parameters[i];
                                                var argName = param.Name;

                                                // Try to get the argument value using dictionary access
                                                if (arguments.ContainsKey(argName))
                                                {
                                                    var argValue = arguments[argName];

                                                    // Handle arrays specially
                                                    if (param.ParameterType.IsArray && argValue != null)
                                                    {
                                                        // If argValue is already an array or ArrayList
                                                        var argList = argValue as System.Collections.IList;
                                                        if (argList != null)
                                                        {
                                                            var elementType = param.ParameterType.GetElementType();
                                                            var typedArray = Array.CreateInstance(elementType, argList.Count);

                                                            for (int j = 0; j < argList.Count; j++)
                                                            {
                                                                var element = argList[j];

                                                                try
                                                                {
                                                                    // Convert element to the correct type
                                                                    var convertedValue = Convert.ChangeType(element, elementType);
                                                                    typedArray.SetValue(convertedValue, j);
                                                                }
                                                                catch (Exception ex)
                                                                {
                                                                    throw new ArgumentException($"Cannot convert element at index {j} to type {elementType.Name}: {ex.Message}");
                                                                }
                                                            }

                                                            paramValues[i] = typedArray;
                                                        }
                                                        else
                                                        {
                                                            throw new ArgumentException($"Parameter '{argName}' should be an array");
                                                        }
                                                    }
                                                    else if (argValue != null)
                                                    {
                                                        try
                                                        {
                                                            // Convert single value to the correct type
                                                            paramValues[i] = Convert.ChangeType(argValue, param.ParameterType);
                                                        }
                                                        catch (Exception ex)
                                                        {
                                                            throw new ArgumentException($"Cannot convert parameter '{argName}' to type {param.ParameterType.Name}: {ex.Message}");
                                                        }
                                                    }
                                                }
                                                else if (param.IsOptional)
                                                {
                                                    // Use default value for optional parameters
                                                    paramValues[i] = param.DefaultValue;
                                                }
                                                else
                                                {
                                                    // Missing required parameter
                                                    throw new ArgumentException($"Required parameter '{argName}' is missing");
                                                }
                                            }

                                            // Invoke the method
                                            var result = methodInfo.Invoke(null, paramValues);

                                            // Convert result to string
                                            resultText = result?.ToString() ?? "Command executed successfully";
                                        }
                                        catch (Exception ex)
                                        {
                                            resultText = $"Error executing command: {ex.Message}";
                                            isError = true;
                                        }
                                    }
                                    else
                                    {
                                        resultText = $"Command '{toolName}' not found";
                                        isError = true;
                                    }
                                }
                                catch (Exception ex)
                                {
                                    resultText = $"Error processing command: {ex.Message}";
                                    isError = true;
                                }

                                var responseJson = new JavaScriptSerializer().Serialize(new
                                {
                                    jsonrpc = "2.0",
                                    id = json["id"],
                                    result = new
                                    {
                                        content = new object[] {
                                            new {
                                                type = "text",
                                                text = resultText
                                            }
                                        },
                                        isError = isError
                                    }
                                });

                                StreamWriter writer;
                                lock (_sseSessions)
                                {
                                    writer = _sseSessions[query];
                                    writer.Write($"data: {responseJson}\n\n");
                                    writer.Flush();
                                }
                                Debug.WriteLine("Responding with Session:" + query);
                            }
                            catch (Exception ex)
                            {
                                // Handle general errors
                                var errorJson = new JavaScriptSerializer().Serialize(new
                                {
                                    jsonrpc = "2.0",
                                    id = json["id"],
                                    result = new
                                    {
                                        content = new object[] {
                                        new {
                                            type = "text",
                                            text = $"Error processing request: {ex.Message}"
                                        }
                                    },
                                        isError = true
                                    }
                                });

                                StreamWriter writer;
                                lock (_sseSessions)
                                {
                                    writer = _sseSessions[query];
                                    writer.Write($"data: {errorJson}\n\n");
                                    writer.Flush();
                                }

                                Console.WriteLine($"Error processing tools/call: {ex.Message}");
                            }
                            finally
                            {
                                //lock (_sseSessions)
                                //    _sseSessions.Remove(sessionId);
                                //ctx.Response.Close();
                            }
                        }
                        else if (_commands.TryGetValue(method, out var methodInfo))
                        {
                            try
                            {
                                string[] args = Array.ConvertAll(@params ?? new object[0], p => p?.ToString() ?? "");
                                var result = methodInfo.Invoke(null, new object[] { args });

                                var response = new
                                {
                                    jsonrpc = "2.0",
                                    id = json["id"],
                                    result = result
                                };

                                var sseData = new JavaScriptSerializer().Serialize(response);

                                lock (_sseSessions)
                                {
                                    var writer = _sseSessions[query];
                                    writer.Write($"id: {json["id"]}\n");
                                    writer.Write($"data: {sseData}\n\n");
                                    writer.Flush();
                                }

                                ctx.Response.StatusCode = 202;
                                ctx.Response.Close();
                            }
                            catch (Exception ex)
                            {
                                var response = new
                                {
                                    jsonrpc = "2.0",
                                    id = json["id"],
                                    error = new { code = -32603, message = ex.Message }
                                };

                                var sseData = new JavaScriptSerializer().Serialize(response);

                                lock (_sseSessions)
                                {
                                    var writer = _sseSessions[query];
                                    writer.Write($"id: {json["id"]}\n");
                                    writer.Write($"data: {sseData}\n\n");
                                    writer.Flush();
                                }

                                ctx.Response.StatusCode = 500;
                                ctx.Response.Close();
                            }
                        }
                        else
                        {
                            var response = new
                            {
                                jsonrpc = "2.0",
                                id = json["id"],
                                error = new { code = -32601, message = "Unknown method" }
                            };

                            var sseData = new JavaScriptSerializer().Serialize(response);

                            lock (_sseSessions)
                            {
                                var writer = _sseSessions[query];
                                writer.Write($"id: {json["id"]}\n");
                                writer.Write($"data: {sseData}\n\n");
                                writer.Flush();
                            }

                            ctx.Response.StatusCode = 404;
                            ctx.Response.Close();
                        }
                    }
                }
                else
                {
                    ctx.Response.StatusCode = 404;
                    ctx.Response.Close();
                }
            }

            if (ctx.Request.HttpMethod == "GET")
            {
                var path = ctx.Request.Url.AbsolutePath.ToLowerInvariant();

                if (path.EndsWith("/discover") || path.EndsWith("/mcp/"))
                {
                    var toolList = new List<object>();

                    foreach (var cmd in _commands)
                    {
                        toolList.Add(new
                        {
                            name = cmd.Key,
                            parameters = new[] { "string[]" }
                        });
                    }

                    var json = new JavaScriptSerializer().Serialize(new
                    {
                        jsonrpc = "2.0",
                        id = (string)null,
                        result = toolList
                    });

                    var buffer = Encoding.UTF8.GetBytes(json);
                    ctx.Response.ContentType = "application/json";
                    ctx.Response.ContentLength64 = buffer.Length;
                    ctx.Response.OutputStream.Write(buffer, 0, buffer.Length);
                    ctx.Response.Close();
                }
                else if (path.EndsWith("/sse/") || path.EndsWith("/sse"))
                {
                    ctx.Response.ContentType = "text/event-stream";
                    ctx.Response.StatusCode = 200;
                    ctx.Response.SendChunked = true;
                    ctx.Response.Headers.Add("Cache-Control", "no-store");

                    string sessionId = "";

                    using (var rng = RandomNumberGenerator.Create())
                    {
                        // Create a byte array of appropriate length (16 bytes = 128 bits)
                        // This will result in a 22-character base64 string after encoding
                        byte[] randomBytes = new byte[16];

                        // Fill the array with random bytes
                        rng.GetBytes(randomBytes);

                        // Convert to Base64 string
                        string base64String = Convert.ToBase64String(randomBytes);

                        // Remove any padding characters (=) and replace any characters that could be problematic in URLs
                        string result = base64String.TrimEnd('=').Replace('/', 'A').Replace('+', '-');
                        sessionId = result;
                    }

                    var writer = new StreamWriter(ctx.Response.OutputStream);
                    lock (_sseSessions)
                        _sseSessions[sessionId] = writer;

                    // Write required handshake format
                    writer.Write($"event: endpoint\n");
                    writer.Write($"data: /message?sessionId={sessionId}\n\n");
                    writer.Flush();

                    //string sessionId = "yMy7lcIzpSQT0ZCTrlGbkw"; //Guid.NewGuid().ToString("N");
                }
                else
                {
                    ctx.Response.StatusCode = 404;
                    ctx.Response.Close();
                }
            }
        }





        // Helper method to convert C# types to JSON schema types
        private string GetJsonSchemaType(Type type)
        {
            if (type == typeof(string))
                return "string";
            else if (type == typeof(int) || type == typeof(long) || type == typeof(short) ||
                     type == typeof(uint) || type == typeof(ulong) || type == typeof(ushort))
                return "integer";
            else if (type == typeof(float) || type == typeof(double) || type == typeof(decimal))
                return "number";
            else if (type == typeof(bool))
                return "boolean";
            else if (type.IsArray)
                return "array";
            else
                return "object";
        }









    }
    }

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using Microsoft.Win32;

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.IO;

using System.Net;

using System.Reflection;

using System.Security.Cryptography;

using System.Text;

using System.Web.Script.Serialization;

using System.Windows.Forms;

using static MCPHttpServerDotNetFramework.Form1;

namespace DotNetPlugin

{

partial class Plugin

{

[Command("Booltestcmd")]

public static bool testcmd(bool boolargs)

{

Console.WriteLine("testcmd!");

return boolargs;

}

[Command("stringTestcmder")]

public static string testcmder(string stringargs)

{

Console.WriteLine("testcmder!");

return stringargs;

}

[Command("StrArraytestcmder")]

public static string[] arraytestcmder(string[] args) //"Uses pipes to delimit arrays

{

Console.WriteLine("arraytestcmder!");

return args;

}

namespace MCPHttpServerDotNetFramework

{

public partial class Form1: Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

// Replace Plugin with your actual class type

var server = new SimpleMcpServer(typeof(DotNetPlugin.Plugin));

server.Start();

Console.ReadLine(); // Keep it running

}

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]

public class CommandAttribute : Attribute

{

public string Name { get; }

public bool DebugOnly { get; set; }

public CommandAttribute(string name)

{

Name = name;

}

public class SimpleMcpServer

{

private readonly HttpListener _listener = new HttpListener();

private readonly Dictionary<string, MethodInfo> _commands = new Dictionary<string, MethodInfo>(StringComparer.OrdinalIgnoreCase);

private readonly Type _targetType;

public SimpleMcpServer(Type commandSourceType)

{

//DisableServerHeader(); //Prob not needed

_targetType = commandSourceType;

_listener.Prefixes.Add("http://localhost:3001/sse/"); //Request come in without a trailing '/' but are still handled

_listener.Prefixes.Add("http://localhost:3001/message/");

// Reflect and register [Command] methods

foreach (var method in commandSourceType.GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic))

{

var attr = method.GetCustomAttribute<CommandAttribute>();

if (attr != null)

_commands[attr.Name] = method;

}

public static void DisableServerHeader()

{

const string keyPath = @"SYSTEM\CurrentControlSet\Services\HTTP\Parameters";

const string valueName = "DisableServerHeader";

const int desiredValue = 2;

try

{

using (var key = Registry.LocalMachine.CreateSubKey(keyPath, true))

{

if (key == null)

{

Console.WriteLine("Failed to open or create the registry key.");

return;

}

var currentValue = key.GetValue(valueName);

if (currentValue == null || (int)currentValue != desiredValue)

{

key.SetValue(valueName, desiredValue, RegistryValueKind.DWord);

Console.WriteLine("Registry value updated. Restarting HTTP service...");

RestartHttpService();

}

else

{

Console.WriteLine("DisableServerHeader is already set to 2. No changes made.");

}

catch (Exception ex)

{

Console.WriteLine("Error modifying registry: " + ex.Message);

}

private static void RestartHttpService()

{

try

{

ExecuteCommand("net stop http");

ExecuteCommand("net start http");

}

catch (Exception ex)

{

Console.WriteLine("Failed to restart HTTP service. Try rebooting manually. Error: " + ex.Message);

}

private static void ExecuteCommand(string command)

{

var process = new Process

{

StartInfo = new ProcessStartInfo("cmd.exe", "/c " + command)

{

Verb = "runas", // Run as administrator

CreateNoWindow = true,

UseShellExecute = true,

WindowStyle = ProcessWindowStyle.Hidden

}

};

process.Start();

process.WaitForExit();

}

public void Start()

{

_listener.Start();

Console.WriteLine("MCP server running");

_listener.BeginGetContext(OnRequest, null);

}

private static readonly Dictionary<string, StreamWriter> _sseSessions = new Dictionary<string, StreamWriter>();

private async void OnRequest(IAsyncResult ar) // Make async void for simplicity here, consider Task for robustness

{

HttpListenerContext ctx = _listener.EndGetContext(ar);

_listener.BeginGetContext(OnRequest, null); // loop

Console.WriteLine("=== Incoming Request ===");

Console.WriteLine($"Method: {ctx.Request.HttpMethod}");

Console.WriteLine($"URL: {ctx.Request.Url}");

Console.WriteLine($"Headers:");

foreach (string key in ctx.Request.Headers)

{

Console.WriteLine($" {key}: {ctx.Request.Headers[key]}");

}

string requestBody = null; // Variable to store the body

Console.WriteLine("=========================");

ctx.Response.Headers["Server"] = "Kestrel";

if (ctx.Request.HttpMethod == "POST")

{

var path = ctx.Request.Url.AbsolutePath.ToLowerInvariant();

if (path.StartsWith("/message"))

{

var query = ctx.Request.QueryString["sessionId"];

if (string.IsNullOrWhiteSpace(query) || !_sseSessions.ContainsKey(query))

{

ctx.Response.StatusCode = 400;

ctx.Response.OutputStream.Close();

return;

}

using (var reader = new StreamReader(ctx.Request.InputStream))

{

var jsonBody = reader.ReadToEnd();

if (ctx.Request.HasEntityBody)

{

Console.WriteLine("Body:");

Console.WriteLine(jsonBody);

}

else

{

Console.WriteLine("No body.");

}

var json = new JavaScriptSerializer().Deserialize<Dictionary<string, object>>(jsonBody);

string method = json["method"]?.ToString();

var @params = json.ContainsKey("params") ? json["params"] as object[] : null;

if (method == "rpc.discover")

{

var toolList = new List<object>();

foreach (var cmd in _commands)

{

toolList.Add(new

{

name = cmd.Key,

parameters = new[] { "string[]" }

});

}

var response = new

{

jsonrpc = "2.0",

id = json["id"],

result = toolList

};

var sseData = new JavaScriptSerializer().Serialize(response);

lock (_sseSessions)

{

var writer = _sseSessions[query];

writer.Write($"id: {json["id"]}\n");

writer.Write($"data: {sseData}\n\n");

writer.Flush();

}

ctx.Response.StatusCode = 202;

ctx.Response.Close();

}

else if (method == "initialize")

{

//POST / message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP / 1.1

//Host: localhost: 3001

//Content-Type: application/json; charset=utf-8

//Content-Length: 202

//{ "jsonrpc":"2.0","id":"7b9343b583174f88bf926c1341bdf2a3-1","method":"initialize","params":{ "protocolVersion":"2024-11-05","capabilities":{ },"clientInfo":{ "name":"QuickstartClient","version":"1.0.0.0"} } }

// HTTP / 1.1 202 Accepted

// Date: Wed, 02 Apr 2025 03:44:44 GMT

// Server: Kestrel

//Transfer - Encoding: chunked

//Accepted

ctx.Response.SendChunked = true;

ctx.Response.StatusCode = 202;

//ctx.Response.ContentType = "text/plain; charset=utf-8";

using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))

{

responseWriter.Write($"Accepted");

responseWriter.Flush();

try

{

var discoverResponse = new JavaScriptSerializer().Serialize(new

{

jsonrpc = "2.0",

id = json["id"],

result = new

{

protocolVersion = "2024-11-05",

capabilities = new { tools = new { } },

serverInfo = new { name = "AspNetCoreSseServer", version = "1.0.0.0" },

instructions = ""

}

});

StreamWriter writer;

lock (_sseSessions)

{

writer = _sseSessions[query];

writer.Write($"data: {discoverResponse}\n\n");

writer.Flush();

}

Debug.WriteLine("Responding with Session:" + query);

}

catch (Exception ex)

{

Console.WriteLine($"SSE connection error: {ex.Message}");

}

finally

{

//lock (_sseSessions)

// _sseSessions.Remove(sessionId);

//ctx.Response.Close();

}

//responseWriter.Write("Accepted");

//responseWriter.Flush();

//responseWriter.Close();

// Don't close the writer or ctx.Response — keep it open for future use

//await Task.Delay(-1); // keep this handler alive forever (or until cancelled)

}

else if (method == "notifications/initialized")

{

//POST / message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP / 1.1

//Host: localhost: 3001

//Content-Type: application/json; charset=utf-8

//Content-Length: 202

// HTTP / 1.1 202 Accepted

// Date: Wed, 02 Apr 2025 03:44:44 GMT

// Server: Kestrel

//Transfer - Encoding: chunked

//Accepted

ctx.Response.SendChunked = true;

ctx.Response.StatusCode = 202;

//ctx.Response.ContentType = "text/plain; charset=utf-8";

using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))

{

responseWriter.Write("Accepted");

responseWriter.BaseStream.Flush();

}

else if (method == "tools/list")

{

//POST /message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP/1.1

//Host: localhost: 3001

//Content-Type: application/json; charset=utf-8

//Content-Length: 202

//{"jsonrpc":"2.0","id":"d95cc745587346b4bf7df2b13ec0890a-2","method":"tools/list"}

//Accepted

ctx.Response.SendChunked = true;

ctx.Response.StatusCode = 202;

//ctx.Response.ContentType = "text/plain; charset=utf-8";

using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))

{

responseWriter.Write("Accepted");

responseWriter.BaseStream.Flush();

}

try

{

// Dynamically get all Command methods

var toolsList = new List<object>();

// Use _commands dictionary which should contain all registered commands

foreach (var command in _commands)

{

string commandName = command.Key;

MethodInfo methodInfo = command.Value;

// Get the Command attribute to access its properties

var attribute = methodInfo.GetCustomAttribute<CommandAttribute>();

if (attribute != null && (!attribute.DebugOnly || Debugger.IsAttached))

{

// Get parameter info for the method

var parameters = methodInfo.GetParameters();

var properties = new Dictionary<string, object>();

var required = new List<string>();

foreach (var param in parameters)

{

string paramName = param.Name;

string paramType = GetJsonSchemaType(param.ParameterType);

properties[paramName] = new

{

type = paramType,

description = $"Parameter for {commandName}"

};

if (!param.IsOptional)

{

required.Add(paramName);

}

// Create the tool definition

var tool = new

{

name = commandName,

description = $"Command: {commandName}",

inputSchema = new

{

title = commandName,

description = $"Command: {commandName}",

type = "object",

properties = properties,

required = required.ToArray()

}

};

toolsList.Add(tool);

}

// Add the default tools for Diag

toolsList.Add(

new

{

name = "Echo",

description = "Echoes the input back to the client.",

inputSchema = new

{

title = "Echo",

description = "Echoes the input back to the client.",

type = "object",

properties = new

{

message = new

{

type = "string"

}

required = new[] { "message" }

}

);

var discoverResponse = new JavaScriptSerializer().Serialize(new

{

jsonrpc = "2.0",

id = json["id"],

result = new

{

tools = toolsList.ToArray()

}

});

StreamWriter writer;

lock (_sseSessions)

{

writer = _sseSessions[query];

writer.Write($"data: {discoverResponse}\n\n");

writer.Flush();

}

Debug.WriteLine("Responding with Session:" + query);

}

catch (Exception ex)

{

Console.WriteLine($"SSE connection error: {ex.Message}");

}

finally

{

//lock (_sseSessions)

// _sseSessions.Remove(sessionId);

//ctx.Response.Close();

}

else if (method == "tools/call")

{

//POST / message?sessionId=nn-PaJBhGnUTSs8Wi9IYeA HTTP / 1.1

//Host: localhost: 3001

//Content-Type: application/json; charset=utf-8

//Content-Length: 202

//{ "jsonrpc":"2.0","id":"d95cc745587346b4bf7df2b13ec0890a-3","method":"tools/call","params":{ "name":"Echo","arguments":{ "message":"tesrt"} } }

//Accepted

ctx.Response.SendChunked = true;

ctx.Response.StatusCode = 202;

//ctx.Response.ContentType = "text/plain; charset=utf-8";

using (var responseWriter = new StreamWriter(ctx.Response.OutputStream, new UTF8Encoding(false)))

{

responseWriter.Write("Accepted");

responseWriter.BaseStream.Flush();

}

try

{

Debug.WriteLine("Params: " + json["params"]);

string toolName = null;

Dictionary<string, object> arguments = null;

string resultText = null;

bool isError = false;

try

{

// JavaScriptSerializer likely returns Dictionary<string, object>

// rather than a strongly typed object, so use dictionary access

var paramsDict = json["params"] as Dictionary<string, object>;

if (paramsDict != null && paramsDict.ContainsKey("name"))

{

toolName = paramsDict["name"].ToString();

if (paramsDict.ContainsKey("arguments"))

{

arguments = paramsDict["arguments"] as Dictionary<string, object>;

}

if (toolName == null || arguments == null)

{

throw new ArgumentException("Invalid request format: missing name or arguments");

}

// Handle Echo command specially

if (toolName == "Echo")

{

// Get the message using dictionary access

if (arguments.ContainsKey("message"))

{

var message = arguments["message"]?.ToString();

resultText = "hello " + message;

}

else

{

throw new ArgumentException("Echo command requires a 'message' argument");

}

// Dynamically invoke registered commands

else if (_commands.TryGetValue(toolName, out var methodInfo))

{

try

{

// Get parameter info for the method

var parameters = methodInfo.GetParameters();

var paramValues = new object[parameters.Length];

// Build parameters for the method call

for (int i = 0; i < parameters.Length; i++)

{

var param = parameters[i];

var argName = param.Name;

// Try to get the argument value using dictionary access

if (arguments.ContainsKey(argName))

{

var argValue = arguments[argName];

// Handle arrays specially

if (param.ParameterType.IsArray && argValue != null)

{

// If argValue is already an array or ArrayList

var argList = argValue as System.Collections.IList;

if (argList != null)

{

var elementType = param.ParameterType.GetElementType();

var typedArray = Array.CreateInstance(elementType, argList.Count);

for (int j = 0; j < argList.Count; j++)

{

var element = argList[j];

try

{

// Convert element to the correct type

var convertedValue = Convert.ChangeType(element, elementType);

typedArray.SetValue(convertedValue, j);

}

catch (Exception ex)

{

throw new ArgumentException($"Cannot convert element at index {j} to type {elementType.Name}: {ex.Message}");

}

paramValues[i] = typedArray;

}

else

{

throw new ArgumentException($"Parameter '{argName}' should be an array");

}

else if (argValue != null)

{

try

{

// Convert single value to the correct type

paramValues[i] = Convert.ChangeType(argValue, param.ParameterType);

}

catch (Exception ex)

{

throw new ArgumentException($"Cannot convert parameter '{argName}' to type {param.ParameterType.Name}: {ex.Message}");

}

else if (param.IsOptional)

{

// Use default value for optional parameters

paramValues[i] = param.DefaultValue;

}

else

{

// Missing required parameter

throw new ArgumentException($"Required parameter '{argName}' is missing");

}

// Invoke the method

var result = methodInfo.Invoke(null, paramValues);

// Convert result to string

resultText = result?.ToString() ?? "Command executed successfully";

}

catch (Exception ex)

{

resultText = $"Error executing command: {ex.Message}";

isError = true;

}

else

{

resultText = $"Command '{toolName}' not found";

isError = true;

}

catch (Exception ex)

{

resultText = $"Error processing command: {ex.Message}";

isError = true;

}

var responseJson = new JavaScriptSerializer().Serialize(new

{

jsonrpc = "2.0",

id = json["id"],

result = new

{

content = new object[] {

new {

type = "text",

text = resultText

}

isError = isError

}

});

StreamWriter writer;

lock (_sseSessions)

{

writer = _sseSessions[query];

writer.Write($"data: {responseJson}\n\n");

writer.Flush();

}

Debug.WriteLine("Responding with Session:" + query);

}

catch (Exception ex)

{

// Handle general errors

var errorJson = new JavaScriptSerializer().Serialize(new

{

jsonrpc = "2.0",

id = json["id"],

result = new

{

content = new object[] {

new {

type = "text",

text = $"Error processing request: {ex.Message}"

}

isError = true

}

});

StreamWriter writer;

lock (_sseSessions)

{

writer = _sseSessions[query];

writer.Write($"data: {errorJson}\n\n");

writer.Flush();

}

Console.WriteLine($"Error processing tools/call: {ex.Message}");

}

finally

{

//lock (_sseSessions)

// _sseSessions.Remove(sessionId);

//ctx.Response.Close();

}

else if (_commands.TryGetValue(method, out var methodInfo))

{

try

{

string[] args = Array.ConvertAll(@params ?? new object[0], p => p?.ToString() ?? "");

var result = methodInfo.Invoke(null, new object[] { args });

var response = new

{

jsonrpc = "2.0",

id = json["id"],

result = result

};

var sseData = new JavaScriptSerializer().Serialize(response);

lock (_sseSessions)

{

var writer = _sseSessions[query];

writer.Write($"id: {json["id"]}\n");

writer.Write($"data: {sseData}\n\n");

writer.Flush();

}

ctx.Response.StatusCode = 202;

ctx.Response.Close();

}

catch (Exception ex)

{

var response = new

{

jsonrpc = "2.0",

id = json["id"],

error = new { code = -32603, message = ex.Message }

};

var sseData = new JavaScriptSerializer().Serialize(response);

lock (_sseSessions)

{

var writer = _sseSessions[query];

writer.Write($"id: {json["id"]}\n");

writer.Write($"data: {sseData}\n\n");

writer.Flush();

}

ctx.Response.StatusCode = 500;

ctx.Response.Close();

}

else

{

var response = new

{

jsonrpc = "2.0",

id = json["id"],

error = new { code = -32601, message = "Unknown method" }

};

var sseData = new JavaScriptSerializer().Serialize(response);

lock (_sseSessions)

{

var writer = _sseSessions[query];

writer.Write($"id: {json["id"]}\n");

writer.Write($"data: {sseData}\n\n");

writer.Flush();

}

ctx.Response.StatusCode = 404;

ctx.Response.Close();

}

else

{

ctx.Response.StatusCode = 404;

ctx.Response.Close();

}

if (ctx.Request.HttpMethod == "GET")

{

var path = ctx.Request.Url.AbsolutePath.ToLowerInvariant();

if (path.EndsWith("/discover") || path.EndsWith("/mcp/"))

{

var toolList = new List<object>();

foreach (var cmd in _commands)

{

toolList.Add(new

{

name = cmd.Key,

parameters = new[] { "string[]" }

});

}

var json = new JavaScriptSerializer().Serialize(new

{

jsonrpc = "2.0",

id = (string)null,

result = toolList

});

var buffer = Encoding.UTF8.GetBytes(json);

ctx.Response.ContentType = "application/json";

ctx.Response.ContentLength64 = buffer.Length;

ctx.Response.OutputStream.Write(buffer, 0, buffer.Length);

ctx.Response.Close();

}

else if (path.EndsWith("/sse/") || path.EndsWith("/sse"))

{

ctx.Response.ContentType = "text/event-stream";

ctx.Response.StatusCode = 200;

ctx.Response.SendChunked = true;

ctx.Response.Headers.Add("Cache-Control", "no-store");

string sessionId = "";

using (var rng = RandomNumberGenerator.Create())

{

// Create a byte array of appropriate length (16 bytes = 128 bits)

// This will result in a 22-character base64 string after encoding

byte[] randomBytes = new byte[16];

// Fill the array with random bytes

rng.GetBytes(randomBytes);

// Convert to Base64 string

string base64String = Convert.ToBase64String(randomBytes);

// Remove any padding characters (=) and replace any characters that could be problematic in URLs

string result = base64String.TrimEnd('=').Replace('/', 'A').Replace('+', '-');

sessionId = result;

}

var writer = new StreamWriter(ctx.Response.OutputStream);

lock (_sseSessions)

_sseSessions[sessionId] = writer;

// Write required handshake format

writer.Write($"event: endpoint\n");

writer.Write($"data: /message?sessionId={sessionId}\n\n");

writer.Flush();

//string sessionId = "yMy7lcIzpSQT0ZCTrlGbkw"; //Guid.NewGuid().ToString("N");

}

else

{

ctx.Response.StatusCode = 404;

ctx.Response.Close();

}

// Helper method to convert C# types to JSON schema types

private string GetJsonSchemaType(Type type)

{

if (type == typeof(string))

return "string";

else if (type == typeof(int) || type == typeof(long) || type == typeof(short) ||

type == typeof(uint) || type == typeof(ulong) || type == typeof(ushort))

return "integer";

else if (type == typeof(float) || type == typeof(double) || type == typeof(decimal))

return "number";

else if (type == typeof(bool))

return "boolean";

else if (type.IsArray)

return "array";

else

return "object";

}

Dynamic library-less MCP server to support use as a plugin (without ASP.net hosting required)

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