Restructure IMcpEndpoint, IMcpClient, and IMcpServer (#723)

* Remove `McpEndpoint` & `IMcpClient`

* Revise naming, add abstract classes

* Fix missing renames

* Move extension methods to instance methods

* Add back old API, but obsoleted

* Add back obsoleted factory classes

* Move deprecation attributes

* `SseClientTransport` -> `HttpClientTransport`

* Update src/ModelContextProtocol.Core/Server/AugmentedServiceProvider.cs

Co-authored-by: Stephen Halter <halter73@gmail.com>

* PR feedback

* PR feedback

* Add back dispose lock

* Fix docs projects

* PR feedback

* Undo `docs/*.md` changes

---------

Co-authored-by: Stephen Halter <halter73@gmail.com>

README.md

@@ -37,8 +37,8 @@ dotnet add package ModelContextProtocol --prerelease
 
 ## Getting Started (Client)
 
-To get started writing a client, the `McpClientFactory.CreateAsync` method is used to instantiate and connect an `IMcpClient`
-to a server. Once you have an `IMcpClient`, you can interact with it, such as to enumerate all available tools and invoke tools.
+To get started writing a client, the `McpClient.CreateAsync` method is used to instantiate and connect an `McpClient`
+to a server. Once you have an `McpClient`, you can interact with it, such as to enumerate all available tools and invoke tools.
 
 ```csharp
 var clientTransport = new StdioClientTransport(new StdioClientTransportOptions
@@ -48,7 +48,7 @@ var clientTransport = new StdioClientTransport(new StdioClientTransportOptions
     Arguments = ["-y", "@modelcontextprotocol/server-everything"],
 });
 
-var client = await McpClientFactory.CreateAsync(clientTransport);
+var client = await McpClient.CreateAsync(clientTransport);
 
 // Print the list of tools available from the server.
 foreach (var tool in await client.ListToolsAsync())
@@ -122,14 +122,14 @@ public static class EchoTool
 }
 ```
 
-Tools can have the `IMcpServer` representing the server injected via a parameter to the method, and can use that for interaction with 
+Tools can have the `McpServer` representing the server injected via a parameter to the method, and can use that for interaction with 
 the connected client. Similarly, arguments may be injected via dependency injection. For example, this tool will use the supplied 
-`IMcpServer` to make sampling requests back to the client in order to summarize content it downloads from the specified url via
+`McpServer` to make sampling requests back to the client in order to summarize content it downloads from the specified url via
 an `HttpClient` injected via dependency injection.
 ```csharp
 [McpServerTool(Name = "SummarizeContentFromUrl"), Description("Summarizes content downloaded from a specific URI")]
 public static async Task<string> SummarizeDownloadedContent(
-    IMcpServer thisServer,
+    McpServer thisServer,
     HttpClient httpClient,
     [Description("The url from which to download the content to summarize")] string url,
     CancellationToken cancellationToken)
@@ -224,7 +224,7 @@ McpServerOptions options = new()
     },
 };
 
-await using IMcpServer server = McpServerFactory.Create(new StdioServerTransport("MyServer"), options);
+await using McpServer server = McpServer.Create(new StdioServerTransport("MyServer"), options);
 await server.RunAsync();
 ```
 

docs/concepts/elicitation/samples/client/Program.cs

@@ -4,7 +4,7 @@ using ModelContextProtocol.Protocol;
 
 var endpoint = Environment.GetEnvironmentVariable("ENDPOINT") ?? "http://localhost:3001";
 
-var clientTransport = new SseClientTransport(new()
+var clientTransport = new HttpClientTransport(new()
 {
     Endpoint = new Uri(endpoint),
     TransportMode = HttpTransportMode.StreamableHttp,
@@ -27,7 +27,7 @@ McpClientOptions options = new()
     }
 };
 
-await using var mcpClient = await McpClientFactory.CreateAsync(clientTransport, options);
+await using var mcpClient = await McpClient.CreateAsync(clientTransport, options);
 // </snippet_McpInitialize>
 
 var tools = await mcpClient.ListToolsAsync();

docs/concepts/elicitation/samples/server/Tools/InteractiveTools.cs

@@ -13,7 +13,7 @@ public sealed class InteractiveTools
     // <snippet_GuessTheNumber>
     [McpServerTool, Description("A simple game where the user has to guess a number between 1 and 10.")]
     public async Task<string> GuessTheNumber(
-        IMcpServer server, // Get the McpServer from DI container
+        McpServer server, // Get the McpServer from DI container
         CancellationToken token
     )
     {

docs/concepts/logging/samples/client/Program.cs

@@ -4,13 +4,13 @@ using System.Text.Json;
 
 var endpoint = Environment.GetEnvironmentVariable("ENDPOINT") ?? "http://localhost:3001";
 
-var clientTransport = new SseClientTransport(new()
+var clientTransport = new HttpClientTransport(new()
 {
     Endpoint = new Uri(endpoint),
     TransportMode = HttpTransportMode.StreamableHttp,
 });
 
-await using var mcpClient = await McpClientFactory.CreateAsync(clientTransport);
+await using var mcpClient = await McpClient.CreateAsync(clientTransport);
 
 // <snippet_LoggingCapabilities>
 // Verify that the server supports logging

docs/concepts/progress/samples/client/Program.cs

@@ -5,7 +5,7 @@ using ModelContextProtocol.Protocol;
 
 var endpoint = Environment.GetEnvironmentVariable("ENDPOINT") ?? "http://localhost:3001";
 
-var clientTransport = new SseClientTransport(new()
+var clientTransport = new HttpClientTransport(new()
 {
     Endpoint = new Uri(endpoint),
     TransportMode = HttpTransportMode.StreamableHttp,
@@ -20,7 +20,7 @@ McpClientOptions options = new()
     }
 };
 
-await using var mcpClient = await McpClientFactory.CreateAsync(clientTransport, options);
+await using var mcpClient = await McpClient.CreateAsync(clientTransport, options);
 
 var tools = await mcpClient.ListToolsAsync();
 foreach (var tool in tools)

docs/concepts/progress/samples/server/Tools/LongRunningTools.cs

@@ -10,7 +10,7 @@ public class LongRunningTools
 {
     [McpServerTool, Description("Demonstrates a long running tool with progress updates")]
     public static async Task<string> LongRunningTool(
-        IMcpServer server,
+        McpServer server,
         RequestContext<CallToolRequestParams> context,
         int duration = 10,
         int steps = 5)

samples/AspNetCoreMcpServer/Tools/SampleLlmTool.cs

@@ -12,7 +12,7 @@ public sealed class SampleLlmTool
 {
     [McpServerTool(Name = "sampleLLM"), Description("Samples from an LLM using MCP's sampling feature")]
     public static async Task<string> SampleLLM(
-        IMcpServer thisServer,
+        McpServer thisServer,
         [Description("The prompt to send to the LLM")] string prompt,
         [Description("Maximum number of tokens to generate")] int maxTokens,
         CancellationToken cancellationToken)

samples/ChatWithTools/Program.cs

@@ -32,7 +32,7 @@ using IChatClient samplingClient = openAIClient.AsIChatClient()
     .UseOpenTelemetry(loggerFactory: loggerFactory, configure: o => o.EnableSensitiveData = true)
     .Build();
 
-var mcpClient = await McpClientFactory.CreateAsync(
+var mcpClient = await McpClient.CreateAsync(
     new StdioClientTransport(new()
     {
         Command = "npx",

samples/EverythingServer/LoggingUpdateMessageSender.cs

@@ -5,7 +5,7 @@ using ModelContextProtocol.Server;
 
 namespace EverythingServer;
 
-public class LoggingUpdateMessageSender(IMcpServer server, Func<LoggingLevel> getMinLevel) : BackgroundService
+public class LoggingUpdateMessageSender(McpServer server, Func<LoggingLevel> getMinLevel) : BackgroundService
 {
     readonly Dictionary<LoggingLevel, string> _loggingLevelMap = new()
     {

samples/EverythingServer/SubscriptionMessageSender.cs

@@ -2,7 +2,7 @@
 using ModelContextProtocol;
 using ModelContextProtocol.Server;
 
-internal class SubscriptionMessageSender(IMcpServer server, HashSet<string> subscriptions) : BackgroundService
+internal class SubscriptionMessageSender(McpServer server, HashSet<string> subscriptions) : BackgroundService
 {
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {

samples/EverythingServer/Tools/LongRunningTool.cs

@@ -10,7 +10,7 @@ public class LongRunningTool
 {
     [McpServerTool(Name = "longRunningOperation"), Description("Demonstrates a long running operation with progress updates")]
     public static async Task<string> LongRunningOperation(
-        IMcpServer server,
+        McpServer server,
         RequestContext<CallToolRequestParams> context,
         int duration = 10,
         int steps = 5)

samples/EverythingServer/Tools/SampleLlmTool.cs

@@ -9,7 +9,7 @@ public class SampleLlmTool
 {
     [McpServerTool(Name = "sampleLLM"), Description("Samples from an LLM using MCP's sampling feature")]
     public static async Task<string> SampleLLM(
-        IMcpServer server,
+        McpServer server,
         [Description("The prompt to send to the LLM")] string prompt,
         [Description("Maximum number of tokens to generate")] int maxTokens,
         CancellationToken cancellationToken)

samples/InMemoryTransport/Program.cs

@@ -6,7 +6,7 @@ using System.IO.Pipelines;
 Pipe clientToServerPipe = new(), serverToClientPipe = new();
 
 // Create a server using a stream-based transport over an in-memory pipe.
-await using IMcpServer server = McpServerFactory.Create(
+await using McpServer server = McpServer.Create(
     new StreamServerTransport(clientToServerPipe.Reader.AsStream(), serverToClientPipe.Writer.AsStream()),
     new McpServerOptions()
     {
@@ -21,7 +21,7 @@ await using IMcpServer server = McpServerFactory.Create(
 _ = server.RunAsync();
 
 // Connect a client using a stream-based transport over the same in-memory pipe.
-await using IMcpClient client = await McpClientFactory.CreateAsync(
+await using McpClient client = await McpClient.CreateAsync(
     new StreamClientTransport(clientToServerPipe.Writer.AsStream(), serverToClientPipe.Reader.AsStream()));
 
 // List all tools.

samples/ProtectedMcpClient/Program.cs

@@ -25,7 +25,7 @@ var consoleLoggerFactory = LoggerFactory.Create(builder =>
     builder.AddConsole();
 });
 
-var transport = new SseClientTransport(new()
+var transport = new HttpClientTransport(new()
 {
     Endpoint = new Uri(serverUrl),
     Name = "Secure Weather Client",
@@ -40,7 +40,7 @@ var transport = new SseClientTransport(new()
     }
 }, httpClient, consoleLoggerFactory);
 
-var client = await McpClientFactory.CreateAsync(transport, loggerFactory: consoleLoggerFactory);
+var client = await McpClient.CreateAsync(transport, loggerFactory: consoleLoggerFactory);
 
 var tools = await client.ListToolsAsync();
 if (tools.Count == 0)

samples/QuickstartClient/Program.cs

@@ -19,7 +19,7 @@ var (command, arguments) = GetCommandAndArguments(args);
 if (command == "http")
 {
     // make sure AspNetCoreMcpServer is running
-    clientTransport = new SseClientTransport(new()
+    clientTransport = new HttpClientTransport(new()
     {
         Endpoint = new Uri("http://localhost:3001")
     });
@@ -33,7 +33,7 @@ else
         Arguments = arguments,
     });
 }
-await using var mcpClient = await McpClientFactory.CreateAsync(clientTransport!);
+await using var mcpClient = await McpClient.CreateAsync(clientTransport!);
 
 var tools = await mcpClient.ListToolsAsync();
 foreach (var tool in tools)
@@ -62,7 +62,7 @@ var messages = new List<ChatMessage>();
 var sb = new StringBuilder();
 
 PromptForInput();
-while(Console.ReadLine() is string query && !"exit".Equals(query, StringComparison.OrdinalIgnoreCase))
+while (Console.ReadLine() is string query && !"exit".Equals(query, StringComparison.OrdinalIgnoreCase))
 {
     if (string.IsNullOrWhiteSpace(query))
     {

samples/TestServerWithHosting/Tools/SampleLlmTool.cs

@@ -12,7 +12,7 @@ public sealed class SampleLlmTool
 {
     [McpServerTool(Name = "sampleLLM"), Description("Samples from an LLM using MCP's sampling feature")]
     public static async Task<string> SampleLLM(
-        IMcpServer thisServer,
+        McpServer thisServer,
         [Description("The prompt to send to the LLM")] string prompt,
         [Description("Maximum number of tokens to generate")] int maxTokens,
         CancellationToken cancellationToken)

src/ModelContextProtocol.AspNetCore/AuthorizationFilterSetup.cs

@@ -292,7 +292,7 @@ internal sealed class AuthorizationFilterSetup(IAuthorizationPolicyProvider? pol
         if (requestServices is null)
         {
             // The IAuthorizationPolicyProvider service must be non-null to get to this line, so it's very unexpected for RequestContext.Services to not be set.
-            throw new InvalidOperationException("RequestContext.Services is not set! The IMcpServer must be initialized with a non-null IServiceProvider.");
+            throw new InvalidOperationException("RequestContext.Services is not set! The McpServer must be initialized with a non-null IServiceProvider.");
         }
 
         // ASP.NET Core's AuthorizationMiddleware resolves the IAuthorizationService from scoped request services, so we do the same.

src/ModelContextProtocol.AspNetCore/HttpServerTransportOptions.cs

@@ -20,7 +20,7 @@ public class HttpServerTransportOptions
     /// Gets or sets an optional asynchronous callback for running new MCP sessions manually.
     /// This is useful for running logic before a sessions starts and after it completes.
     /// </summary>
-    public Func<HttpContext, IMcpServer, CancellationToken, Task>? RunSessionHandler { get; set; }
+    public Func<HttpContext, McpServer, CancellationToken, Task>? RunSessionHandler { get; set; }
 
     /// <summary>
     /// Gets or sets whether the server should run in a stateless mode that does not require all requests for a given session

src/ModelContextProtocol.AspNetCore/SseHandler.cs

@@ -53,7 +53,7 @@ internal sealed class SseHandler(
 
             try
             {
-                await using var mcpServer = McpServerFactory.Create(transport, mcpServerOptions, loggerFactory, context.RequestServices);
+                await using var mcpServer = McpServer.Create(transport, mcpServerOptions, loggerFactory, context.RequestServices);
                 context.Features.Set(mcpServer);
 
                 var runSessionAsync = httpMcpServerOptions.Value.RunSessionHandler ?? StreamableHttpHandler.RunSessionAsync;

src/ModelContextProtocol.AspNetCore/StreamableHttpHandler.cs

@@ -232,7 +232,7 @@ internal sealed class StreamableHttpHandler(
             }
         }
 
-        var server = McpServerFactory.Create(transport, mcpServerOptions, loggerFactory, mcpServerServices);
+        var server = McpServer.Create(transport, mcpServerOptions, loggerFactory, mcpServerServices);
         context.Features.Set(server);
 
         var userIdClaim = statelessId?.UserIdClaim ?? GetUserIdClaim(context.User);
@@ -307,7 +307,7 @@ internal sealed class StreamableHttpHandler(
         };
     }
 
-    internal static Task RunSessionAsync(HttpContext httpContext, IMcpServer session, CancellationToken requestAborted)
+    internal static Task RunSessionAsync(HttpContext httpContext, McpServer session, CancellationToken requestAborted)
         => session.RunAsync(requestAborted);
 
     // SignalR only checks for ClaimTypes.NameIdentifier in HttpConnectionDispatcher, but AspNetCore.Antiforgery checks that plus the sub and UPN claims.