Improve tool handling (#28)

* Improve tool handling

* Rework stuff with new hosting options

* Update readme

* Fix build

* Try run client tests

* Fix build

* Fix issues on linux

* Try to run testserver on linux

* Fix test issue

* Fix code smells

samples/TestServerWithHosting/Program.cs

@@ -19,6 +19,7 @@ try
     builder.Services.AddSerilog();
     builder.Services.AddMcpServer()
         .WithStdioServerTransport()
+        .WithTools()
         .WithCallToolHandler((r, ct) => Task.FromResult(new McpDotNet.Protocol.Types.CallToolResponse()));
 
     var app = builder.Build();

samples/TestServerWithHosting/Tools/EchoTool.cs

@@ -0,0 +1,13 @@
+using McpDotNet.Server;
+
+namespace TestServerWithHosting.Tools;
+
+[McpToolType]
+public static class EchoTool
+{
+    [McpTool(Description = "Echoes the input back to the client.")]
+    public static string Echo([McpParameter(true)] string message)
+    {
+        return "hello " + message;
+    }
+}

samples/TestServerWithHosting/Tools/SampleLlmTool.cs

@@ -0,0 +1,47 @@
+using McpDotNet.Protocol.Types;
+using McpDotNet.Server;
+
+namespace TestServerWithHosting.Tools;
+
+/// <summary>
+/// This tool uses depenency injection and async method
+/// </summary>
+[McpToolType]
+public class SampleLlmTool
+{
+    private readonly IMcpServer _server;
+
+    public SampleLlmTool(IMcpServer server)
+    {
+        _server = server ?? throw new ArgumentNullException(nameof(server));
+    }
+
+    [McpTool(Name = "sampleLLM", Description = "Samples from an LLM using MCP's sampling feature")]
+    public async Task<string> SampleLLM([McpParameter(true, Description = "The prompt to send to the LLM")] string prompt, [McpParameter(true, Description = "Maximum number of tokens to generate")] int maxTokens, CancellationToken cancellationToken)
+    {
+        var samplingParams = CreateRequestSamplingParams(prompt ?? string.Empty, "sampleLLM", maxTokens);
+        var sampleResult = await _server.RequestSamplingAsync(samplingParams, cancellationToken);
+
+        return $"LLM sampling result: {sampleResult.Content.Text}";
+    }
+
+    private static CreateMessageRequestParams CreateRequestSamplingParams(string context, string uri, int maxTokens = 100)
+    {
+        return new CreateMessageRequestParams()
+        {
+            Messages = [new SamplingMessage()
+                {
+                    Role = Role.User,
+                    Content = new Content()
+                    {
+                        Type = "text",
+                        Text = $"Resource {uri} context: {context}"
+                    }
+                }],
+            SystemPrompt = "You are a helpful test server.",
+            MaxTokens = maxTokens,
+            Temperature = 0.7f,
+            IncludeContext = ContextInclusion.ThisServer
+        };
+    }
+}