MCP Server in C# .NET - How it works?(AI Chat Application Using MCP and LLM) an MCP client LLM Application such as Claude

using System;
using System.Threading.Tasks;
using Anthropic.Client;            // hypothetical LLM client SDK
using Anthropic.Mcp.Client;

class Program
{
  static async Task Main()
  {
    var mcpClient = new MpcDemoClient("http://localhost:5000/mcp", "<YOUR-MCP-KEY>");
    var llm = new ClaudeClient("<YOUR-LLM-KEY>");

    Console.WriteLine("Ask: ‘Who is customer 1?’");
    while (true)
    {
      Console.Write("> ");
      var userInput = Console.ReadLine();
      if (string.IsNullOrWhiteSpace(userInput)) break;

      // Example prompt instructing the model to call MCP
      var prompt = @$"
You are an assistant that can call MCP tools.
User says: {userInput}

If the user asks for customer data, respond with:
[MCP-ACTION]
tool: getCustomer
args: {{ ""id"": ""1"" }}
[/MCP-ACTION]

Otherwise, answer normally.
";

      var llmResponse = await llm.GenerateAsync(prompt);
      Console.WriteLine($"Model: {llmResponse.Text}");

      if (llmResponse.Text.Contains("[MCP-ACTION]"))
      {
        // Extract tool name and args (parsing omitted for brevity)...
        var customer = await mcpClient.GetCustomerAsync("1");
        Console.WriteLine($"→ Fetched via MCP: {customer?.Name} ({customer?.Email})");
      }
    }
  }
}