Enable IsAotCompatible for ModelContextProtocol.AspNetCore (#175)

Author: stephentoub

src/ModelContextProtocol.AspNetCore/McpEndpointRouteBuilderExtensions.cs

@@ -89,7 +89,7 @@ public static IEndpointConventionBuilder MapMcp(this IEndpointRouteBuilder endpo
                 return;
             }
 
-            var message = await context.Request.ReadFromJsonAsync<IJsonRpcMessage>(McpJsonUtilities.DefaultOptions, context.RequestAborted);
+            var message = (IJsonRpcMessage?)await context.Request.ReadFromJsonAsync(McpJsonUtilities.DefaultOptions.GetTypeInfo(typeof(IJsonRpcMessage)), context.RequestAborted);
             if (message is null)
             {
                 await Results.BadRequest("No message in request body.").ExecuteAsync(context);

src/ModelContextProtocol.AspNetCore/ModelContextProtocol.AspNetCore.csproj

@@ -9,6 +9,7 @@
     <PackageId>ModelContextProtocol.AspNetCore</PackageId>
     <Description>ASP.NET Core extensions for the C# Model Context Protocol (MCP) SDK.</Description>
     <PackageReadmeFile>README.md</PackageReadmeFile>
+    <IsAotCompatible>true</IsAotCompatible>
   </PropertyGroup>
 
   <ItemGroup>