Apply doc comment suggestions from review

Co-authored-by: halter73 <54385+halter73@users.noreply.github.com>

Author: Copilot

src/Common/Experimentals.cs

@@ -73,7 +73,7 @@ internal static class Experimentals
 
     /// <summary>
     /// Diagnostic ID for experimental SDK APIs unrelated to the MCP specification,
-    /// such as subclassing <c>McpClient</c>/<c>McpServer</c> and <c>RunSessionHandler</c>.
+    /// such as subclassing <c>McpClient</c>/<c>McpServer</c> or referencing <c>RunSessionHandler</c>.
     /// </summary>
     /// <remarks>
     /// This diagnostic ID covers experimental SDK-level extensibility APIs. All constants

src/ModelContextProtocol.AspNetCore/HttpServerTransportOptions.cs

@@ -25,6 +25,11 @@ public class HttpServerTransportOptions
     /// <remarks>
     /// This callback is useful for running logic before a session starts and after it completes.
     /// <para>
+    /// The <see cref="HttpContext"/> parameter comes from the request that initiated the session (e.g., the
+    /// initialize request) and may not be usable after <see cref="McpServer.RunAsync"/> starts, since that
+    /// request will have already completed.
+    /// </para>
+    /// <para>
     /// Consider using <see cref="ConfigureSessionOptions"/> instead, which provides access to the
     /// <see cref="HttpContext"/> of the initializing request with fewer known issues.
     /// </para>