[MCP] Update MCP SDK

src/Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="Basic.Reference.Assemblies.Net90" Version="1.8.3" />
     <PackageVersion Include="BenchmarkDotNet" Version="0.15.4" />
     <PackageVersion Include="CaseConverter" Version="2.0.1" />
-    <PackageVersion Include="ChilliCream.ModelContextProtocol.AspNetCore" Version="1.1.0" />
+    <PackageVersion Include="ChilliCream.ModelContextProtocol.AspNetCore" Version="1.2.0" />
     <PackageVersion Include="ChilliCream.Nitro.App" Version="$(NitroVersion)" />
     <PackageVersion Include="ChilliCream.Testing.Utilities" Version="0.2.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />

src/HotChocolate/Adapters/src/Adapters.Mcp.Core/Extensions/EndpointRouteBuilderExtensions.cs

@@ -47,40 +47,19 @@ public static IEndpointConventionBuilder MapGraphQLMcp(
 
         if (!streamableHttpHandler.HttpServerTransportOptions.Stateless)
         {
-            // The GET and DELETE endpoints are not mapped in Stateless mode since there's no way to
-            // send unsolicited messages for the GET to handle, and there is no server-side state
-            // for the DELETE to clean up.
+            // The GET endpoint is not mapped in Stateless mode since there's no way to send
+            // unsolicited messages. Resuming streams via GET is currently not supported in
+            // Stateless mode.
             streamableHttpGroup
                 .MapGet("", streamableHttpHandler.HandleGetRequestAsync)
                 .WithMetadata(
                     new ProducesResponseTypeMetadata(
                         StatusCodes.Status200OK,
                         contentTypes: ["text/event-stream"]));
 
+            // The DELETE endpoint is not mapped in Stateless mode since there is no server-side
+            // state for the DELETE to clean up.
             streamableHttpGroup.MapDelete("", streamableHttpHandler.HandleDeleteRequestAsync);
-
-            // Map legacy HTTP with SSE endpoints only if not in Stateless mode, because we cannot
-            // guarantee the /message requests will be handled by the same process as the /sse
-            // request.
-            var sseHandler =
-                endpoints.ServiceProvider.GetRequiredKeyedService<SseHandlerProxy>(schemaName);
-
-            var sseGroup =
-                mcpGroup
-                    .MapGroup("")
-                    .WithDisplayName(b => $"GraphQL MCP HTTP with SSE | {b.DisplayName}");
-
-            sseGroup
-                .MapGet("/sse", sseHandler.HandleSseRequestAsync)
-                .WithMetadata(
-                    new ProducesResponseTypeMetadata(
-                        StatusCodes.Status200OK,
-                        contentTypes: ["text/event-stream"]));
-
-            sseGroup
-                .MapPost("/message", sseHandler.HandleMessageRequestAsync)
-                .WithMetadata(new AcceptsMetadata(["application/json"]))
-                .WithMetadata(new ProducesResponseTypeMetadata(StatusCodes.Status202Accepted));
         }
 
         return mcpGroup;

src/HotChocolate/Adapters/src/Adapters.Mcp.Core/Extensions/ServiceCollectionExtensions.cs

@@ -34,10 +34,6 @@ public static void AddMcpServices(this IServiceCollection services, string schem
             .AddKeyedSingleton(
                 schemaName,
                 static (sp, name) => new StreamableHttpHandlerProxy(
-                    sp.GetRequiredKeyedService<McpRequestExecutorProxy>(name)))
-            .AddKeyedSingleton(
-                schemaName,
-                static (sp, name) => new SseHandlerProxy(
                     sp.GetRequiredKeyedService<McpRequestExecutorProxy>(name)));
     }
 

src/HotChocolate/Adapters/src/Adapters.Mcp.Core/Proxies/McpExecutorSession.cs

@@ -2,6 +2,4 @@
 
 namespace HotChocolate.Adapters.Mcp.Proxies;
 
-internal sealed record McpExecutorSession(
-    StreamableHttpHandler StreamableHttpHandler,
-    SseHandler SseHandler);
+internal sealed record McpExecutorSession(StreamableHttpHandler StreamableHttpHandler);

src/HotChocolate/Adapters/src/Adapters.Mcp.Core/Proxies/McpRequestExecutorProxy.cs

@@ -49,10 +49,7 @@ protected override void OnConfigureRequestExecutor(
                 oldExecutor.Schema.Services.GetRequiredService<ConcurrentDictionary<string, McpServer>>());
         }
 
-        var session =
-            new McpExecutorSession(
-                newExecutor.Schema.Services.GetRequiredService<StreamableHttpHandler>(),
-                newExecutor.Schema.Services.GetRequiredService<SseHandler>());
+        var session = new McpExecutorSession(newExecutor.Schema.Services.GetRequiredService<StreamableHttpHandler>());
 
         newExecutor.Features.Set(session);
         _session = session;

src/HotChocolate/Adapters/test/Adapters.Mcp.Tests/Handlers/CallToolHandlerTests.cs

@@ -53,12 +53,12 @@ await storage.AddOrUpdateToolAsync(
         mockServer.SetupGet(s => s.Services).Returns(executor.Schema.Services);
         var request = new JsonRpcRequest { Method = RequestMethods.ToolsCall };
 
-        return new RequestContext<CallToolRequestParams>(mockServer.Object, request)
-        {
-            Params = new CallToolRequestParams
+        return new RequestContext<CallToolRequestParams>(
+            mockServer.Object,
+            request,
+            new CallToolRequestParams
             {
                 Name = toolName
-            }
-        };
+            });
     }
 }