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using Microsoft.Extensions.Configuration; using Microsoft.Extensions.Hosting; using ModelContextProtocol.Client; using ModelContextProtocol.Protocol.Transport; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text.Json; using System.Threading.Tasks; // Create a command processor to handle dynamic commands public class CommandProcessor { // Helper class to store command information private class CommandInfo { public string Name { get; set; } public string Description { get; set; } public Dictionary<string, object?> Parameters { get; set; } public List<string> RequiredParameters { get; set; } public Dictionary<string, string> ParameterTypes { get; set; } public Dictionary<string, string> ParameterDescriptions { get; set; } public CommandInfo(string name, string description) { Name = name; Description = description; Parameters = new Dictionary<string, object?>(); RequiredParameters = new List<string>(); ParameterTypes = new Dictionary<string, string>(); ParameterDescriptions = new Dictionary<string, string>(); } } // Dictionary to store available commands private Dictionary<string, CommandInfo> availableCommands = new Dictionary<string, CommandInfo>(StringComparer.OrdinalIgnoreCase); private Dictionary<string, CommandInfo> commandAliases = new Dictionary<string, CommandInfo>(StringComparer.OrdinalIgnoreCase); // Call this when initializing the application or when you want to refresh the commands public async Task RefreshAvailableCommandsAsync(IMcpClient mcpClient) { availableCommands.Clear(); commandAliases.Clear(); try { var tools = await mcpClient.ListToolsAsync(); foreach (var tool in tools) { Console.WriteLine($"Registering tool: {tool.Name}"); var command = new CommandInfo(tool.Name, tool.Description); // Parse JSON schema to extract parameter information if (tool.JsonSchema.ValueKind == JsonValueKind.Object) { var properties = tool.JsonSchema.GetProperty("properties"); if (properties.ValueKind == JsonValueKind.Object) { foreach (var property in properties.EnumerateObject()) { string paramName = property.Name; string paramType = "string"; // Default type string paramDescription = ""; if (property.Value.TryGetProperty("type", out var typeElement)) { paramType = typeElement.GetString() ?? "string"; } if (property.Value.TryGetProperty("description", out var descElement)) { paramDescription = descElement.GetString() ?? ""; } command.ParameterTypes[paramName] = paramType; command.ParameterDescriptions[paramName] = paramDescription; } } // Get required parameters if (tool.JsonSchema.TryGetProperty("required", out var requiredElement) && requiredElement.ValueKind == JsonValueKind.Array) { foreach (var item in requiredElement.EnumerateArray()) { string? reqParam = item.GetString(); if (!string.IsNullOrEmpty(reqParam)) { command.RequiredParameters.Add(reqParam); } } } } // Add command to dictionary availableCommands[tool.Name] = command; // Add command alias (lowercase version) commandAliases[tool.Name.ToLowerInvariant()] = command; } Console.WriteLine($"Registered {availableCommands.Count} commands from the server."); Console.WriteLine($"-Here are some example call formats-"); Console.WriteLine($"sampleLLM prompt=hi, maxTokens=5"); Console.WriteLine($"MyarrayFunction arg=String1|String2|string3"); } catch (Exception ex) { Console.WriteLine($"Error refreshing commands: {ex.Message}"); } } // Process user input and map to appropriate commands public bool ProcessUserInput(string userInput, out string method, out Dictionary<string, object?> parameters) { method = string.Empty; parameters = new Dictionary<string, object?>(); if (string.IsNullOrWhiteSpace(userInput)) return false; // Split input into command and arguments string[] parts = userInput.Split(new[] { ' ' }, 2); string commandName = parts[0].ToLowerInvariant(); string args = parts.Length > 1 ? parts[1] : string.Empty; CommandInfo? command = null; // Check for direct command match if (availableCommands.TryGetValue(commandName, out command) || commandAliases.TryGetValue(commandName, out command)) { // Command found directly } else { Console.WriteLine($"Unknown command: {commandName}"); Console.WriteLine("Available commands:"); foreach (var cmd in availableCommands.Values.Distinct()) { Console.WriteLine($"- {cmd.Name}: {cmd.Description}"); } return false; } method = command.Name; // Parse parameters based on schema if (!TryParseParameters(args, command, parameters)) { return false; } // Check if all required parameters are provided foreach (var requiredParam in command.RequiredParameters) { if (!parameters.ContainsKey(requiredParam)) { Console.WriteLine($"Missing required parameter: {requiredParam}"); Console.WriteLine($"Usage: {command.Name} {string.Join(", ", command.RequiredParameters.Select(p => p + "=<value>"))}"); return false; } } return true; } // Helper method to parse parameters private bool TryParseParameters(string args, CommandInfo command, Dictionary<string, object?> parameters) { try { if (!string.IsNullOrEmpty(args)) { // Parse as key=value pairs var argPairs = args.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries); foreach (var pair in argPairs) { var keyValue = pair.Split(new[] { '=' }, 2); if (keyValue.Length == 2) { string key = keyValue[0].Trim(); string value = keyValue[1].Trim(); if (command.ParameterTypes.TryGetValue(key, out var paramType)) { // Convert value based on parameter type switch (paramType.ToLowerInvariant()) { case "integer": if (int.TryParse(value, out var intValue)) parameters[key] = intValue; else parameters[key] = 0; break; case "number": if (double.TryParse(value, out var doubleValue)) parameters[key] = doubleValue; else parameters[key] = 0.0; break; case "boolean": parameters[key] = value.ToLowerInvariant() == "true"; break; case "array": parameters[key] = value.Split(new[] { '|' }, StringSplitOptions.RemoveEmptyEntries); break; default: parameters[key] = value; break; } } else { // If type is unknown, just use the string value parameters[key] = value; } } } } return true; } catch (Exception ex) { Console.WriteLine($"Error parsing command parameters: {ex.Message}"); return false; } } // Helper method to display information about available commands public void DisplayHelpInfo() { Console.WriteLine("Available commands:"); foreach (var cmd in availableCommands.Values) { Console.WriteLine($"- {cmd.Name}: {cmd.Description}"); if (cmd.RequiredParameters.Count > 0) { Console.WriteLine($" Required parameters: {string.Join(", ", cmd.RequiredParameters)}"); } if (cmd.ParameterTypes.Count > 0) { Console.WriteLine(" Parameters:"); foreach (var param in cmd.ParameterTypes) { string description = cmd.ParameterDescriptions.ContainsKey(param.Key) ? cmd.ParameterDescriptions[param.Key] : ""; Console.WriteLine($" {param.Key} ({param.Value}): {description}"); } } Console.WriteLine(); } Console.WriteLine("Special commands:"); Console.WriteLine("- help: Display this help information"); Console.WriteLine("- refresh: Refresh the list of available commands from the server"); Console.WriteLine("- exit: Exit the application"); } } // Main program class public class Program { public static async Task Main(string[] args) { var builder = Host.CreateApplicationBuilder(args); builder.Configuration .AddEnvironmentVariables() .AddUserSecrets<Program>(); var (command, arguments) = GetCommandAndArguments(args); await using var mcpClient = await McpClientFactory.CreateAsync(new() { Id = "demo-server", Name = "Demo Server", TransportType = TransportTypes.Sse, Location = "http://localhost:3001/sse", }); // Create a command processor var commandProcessor = new CommandProcessor(); // Initialize with available commands from the server await commandProcessor.RefreshAvailableCommandsAsync(mcpClient); Console.ForegroundColor = ConsoleColor.Green; Console.WriteLine("MCP Client Started!"); Console.ResetColor(); PromptForInput(); while (Console.ReadLine() is string query && !"exit".Equals(query, StringComparison.OrdinalIgnoreCase)) { if (string.IsNullOrWhiteSpace(query)) { PromptForInput(); continue; } // Special commands if (query.Equals("help", StringComparison.OrdinalIgnoreCase)) { commandProcessor.DisplayHelpInfo(); PromptForInput(); continue; } else if (query.Equals("refresh", StringComparison.OrdinalIgnoreCase)) { await commandProcessor.RefreshAvailableCommandsAsync(mcpClient); PromptForInput(); continue; } // Process user command if (commandProcessor.ProcessUserInput(query, out string method, out Dictionary<string, object?> parameters)) { Console.WriteLine($"Invoking {method}..."); try { // Pass the parameters as IReadOnlyDictionary<string, object?> var response = await mcpClient.CallToolAsync(method, parameters); Console.ForegroundColor = ConsoleColor.Green; Console.WriteLine("Response:"); Console.ResetColor(); if (response is ModelContextProtocol.Protocol.Types.CallToolResponse toolResponse) { foreach (var content in toolResponse.Content) { if (!string.IsNullOrWhiteSpace(content.Text)) { Console.WriteLine(content.Text); } else if (content.Data is string data) { Console.WriteLine(data); } else if (content.Resource is { Uri: not null } resource) { Console.WriteLine($"[Resource]: {resource.Uri}"); } else { Console.WriteLine("[Unknown content format]"); } } } else { Console.WriteLine(response?.ToString() ?? "[null response]"); } } catch (Exception ex) { Console.ForegroundColor = ConsoleColor.Red; Console.WriteLine($"Error calling method: {ex.Message}"); Console.ResetColor(); } } PromptForInput(); } } static void PromptForInput() { Console.WriteLine("Enter a command (or 'exit' to quit, 'help' for available commands):"); Console.ForegroundColor = ConsoleColor.Cyan; Console.Write("> "); Console.ResetColor(); } /// <summary> /// Determines the command (executable) to run and the script/path to pass to it. /// </summary> static (string command, string arguments) GetCommandAndArguments(string[] args) { return ("C:\\Users\\User\\source\\repos\\mcp-csharp-sdk\\artifacts\\bin\\QuickstartWeatherServer\\Debug\\net8.0\\QuickstartWeatherServer.exe", ""); } } |