add mcp sample for chat.

AzureSignalR.sln

@@ -86,6 +86,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ManagementPublisher", "samp
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChatSample.RazorPages", "samples\ChatSample\ChatSample.RazorPages\ChatSample.RazorPages.csproj", "{D7A38BB7-6416-4E15-AD87-D525F203F549}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChatMcp", "samples\ChatSample\ChatMcp\ChatMcp.csproj", "{DCF069DE-1C30-EE2B-D0ED-3355E998847B}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -196,6 +198,10 @@ Global
 		{D7A38BB7-6416-4E15-AD87-D525F203F549}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D7A38BB7-6416-4E15-AD87-D525F203F549}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{D7A38BB7-6416-4E15-AD87-D525F203F549}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DCF069DE-1C30-EE2B-D0ED-3355E998847B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DCF069DE-1C30-EE2B-D0ED-3355E998847B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DCF069DE-1C30-EE2B-D0ED-3355E998847B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DCF069DE-1C30-EE2B-D0ED-3355E998847B}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -229,6 +235,7 @@ Global
 		{82C1FF3D-EC6C-4B21-B6A4-E69E8D75D0D0} = {2429FBD8-1FCE-4C42-AA28-DF32F7249E77}
 		{0F32E624-7AC8-4CA7-8ED9-E1A877442020} = {C965ED06-6A17-4329-B3C6-811830F4F4ED}
 		{D7A38BB7-6416-4E15-AD87-D525F203F549} = {C965ED06-6A17-4329-B3C6-811830F4F4ED}
+		{DCF069DE-1C30-EE2B-D0ED-3355E998847B} = {C965ED06-6A17-4329-B3C6-811830F4F4ED}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {7945A4E4-ACDB-4F6E-95CA-6AC6E7C2CD59}

samples/ChatSample/ChatMcp/ChatMcp.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <InvariantGlobalization>true</InvariantGlobalization>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="..\ChatSample\IChatHub.cs" Link="IChatHub.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.14" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.1" />
+    <PackageReference Include="ModelContextProtocol" Version="0.1.0-preview.6" />
+  </ItemGroup>
+
+</Project>

samples/ChatSample/ChatMcp/ChatProxy.cs

@@ -0,0 +1,24 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Threading.Tasks;
+
+using ChatSample;
+using Microsoft.AspNetCore.SignalR.Client;
+
+namespace ChatMcp;
+
+public sealed class ChatProxy(HubConnection connection) : IChatHub
+{
+    public async Task BroadcastMessage(string name, string message)
+    {
+        await connection.InvokeAsync(nameof(IChatHub.BroadcastMessage), name, message);
+    }
+
+    Task IChatHub.Echo(string name, string message)
+    {
+        // we dont need this ability in the MCP tool.
+        throw new NotSupportedException();
+    }
+}

samples/ChatSample/ChatMcp/ChatTool.cs

@@ -0,0 +1,22 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.ComponentModel;
+using System.Threading.Tasks;
+
+using ModelContextProtocol.Server;
+
+namespace ChatMcp;
+
+[McpServerToolType]
+public class ChatTool(ChatProxy proxy)
+{
+    [McpServerTool]
+    [Description("Broadcast a message to all clients.")]
+    public async Task BroadcastMessage(
+        [Description("The text message.")]
+        string message)
+    {
+        await proxy.BroadcastMessage("MCP", message);
+    }
+}

samples/ChatSample/ChatMcp/Program.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+using System;
+
+using ChatMcp;
+using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+var url = Environment.GetEnvironmentVariable("ServerUrl");
+if (string.IsNullOrEmpty(url))
+{
+    url = "http://localhost:5050/chat";
+}
+if (!Uri.TryCreate(url, UriKind.Absolute, out var serverUrl))
+{
+    Console.WriteLine($"Invalid ServerUrl: {url}");
+    return;
+}
+
+await using var connection = new HubConnectionBuilder()
+    .WithUrl(url)
+    .WithAutomaticReconnect()
+    .Build();
+await connection.StartAsync();
+
+var builder = Host.CreateApplicationBuilder(args);
+builder.Logging.AddConsole(consoleLogOptions =>
+{
+    // Configure all logs to go to stderr
+    consoleLogOptions.LogToStandardErrorThreshold = LogLevel.Trace;
+});
+
+builder.Services
+    .AddSingleton(new ChatProxy(connection))
+    .AddMcpServer()
+    .WithStdioServerTransport()
+    .WithToolsFromAssembly();
+await builder.Build().RunAsync();

samples/ChatSample/ChatSample/ChatHub.cs

@@ -10,17 +10,17 @@
 
 namespace ChatSample;
 
-public class ChatHub(IHubContext<ChatHub> context) : Hub
+public class ChatHub(IHubContext<ChatHub> context) : Hub, IChatHub
 {
-    public void BroadcastMessage(string name, string message)
+    public async Task BroadcastMessage(string name, string message)
     {
-        Clients.All.SendAsync("broadcastMessage", name, message);
+        await Clients.All.SendAsync("broadcastMessage", name, message);
         Console.WriteLine("Broadcasting...");
     }
 
-    public void Echo(string name, string message)
+    public async Task Echo(string name, string message)
     {
-        Clients.Caller.SendAsync("echo", name,
+        await Clients.Caller.SendAsync("echo", name,
             $"{message} (echo from server, Client IP: {Context.GetHttpContext().Connection.RemoteIpAddress}");
         Console.WriteLine("Echo...");
     }

samples/ChatSample/ChatSample/IChatHub.cs

@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Threading.Tasks;
+
+namespace ChatSample;
+
+public interface IChatHub
+{
+    Task BroadcastMessage(string name, string message);
+    Task Echo(string name, string message);
+}

samples/ChatSample/ChatSample/Startup.cs

@@ -45,6 +45,8 @@ private enum AuthTypes
     {
         VisualStudio = 0,
 
+        VisualStudioCode,
+
         ApplicationWithCertificate,
 
         ApplicationWithClientSecret,
@@ -66,7 +68,8 @@ public void ConfigureServices(IServiceCollection services)
             {
                 TokenCredential credential = AuthType switch
                 {
-                    AuthTypes.VisualStudio => new VisualStudioCodeCredential(),
+                    AuthTypes.VisualStudio => new VisualStudioCredential(),
+                    AuthTypes.VisualStudioCode => new VisualStudioCodeCredential(),
                     AuthTypes.ApplicationWithCertificate => new ClientCertificateCredential(TenantId, AppClientId, "path-to-cert-file"),
                     AuthTypes.ApplicationWithClientSecret => new ClientSecretCredential(TenantId, AppClientId, "client-secret-value"),
                     AuthTypes.ApplicationWithFederatedIdentity => GetClientAssertionCredential(TenantId, AppClientId, MsiClientId),