diff --git a/dotnet/samples/03-workflows/Agents/CustomAgentExecutors/Program.cs b/dotnet/samples/03-workflows/Agents/CustomAgentExecutors/Program.cs
index e2dec8505b..41b622fdad 100644
--- a/dotnet/samples/03-workflows/Agents/CustomAgentExecutors/Program.cs
+++ b/dotnet/samples/03-workflows/Agents/CustomAgentExecutors/Program.cs
@@ -61,6 +61,12 @@ public static class Program
             {
                 Console.WriteLine($"{outputEvent}");
             }
+
+            if (evt is WorkflowErrorEvent errorEvent)
+            {
+                Console.WriteLine($"Workflow error: {errorEvent.Exception?.Message}");
+                Console.WriteLine($"Details: {errorEvent.Exception}");
+            }
         }
     }
 }
@@ -175,7 +181,9 @@ internal sealed class FeedbackEvent(FeedbackResult feedbackResult) : WorkflowEve
 /// <summary>
 /// A custom executor that uses an AI agent to provide feedback on a slogan.
 /// </summary>
-internal sealed class FeedbackExecutor : Executor<SloganResult>
+[SendsMessage(typeof(FeedbackResult))]
+[YieldsOutput(typeof(string))]
+internal sealed partial class FeedbackExecutor : Executor<SloganResult>
 {
     private readonly AIAgent _agent;
     private AgentSession? _session;
diff --git a/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Analysis/SemanticAnalyzer.cs b/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Analysis/SemanticAnalyzer.cs
index b62377a971..c116587507 100644
--- a/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Analysis/SemanticAnalyzer.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Analysis/SemanticAnalyzer.cs
@@ -212,6 +212,7 @@ internal static class SemanticAnalyzer
         bool isPartialClass = IsPartialClass(classSymbol, cancellationToken);
         bool derivesFromExecutor = DerivesFromExecutor(classSymbol);
         bool hasManualConfigureProtocol = HasConfigureProtocolDefined(classSymbol);
+        bool baseHasConfigureProtocol = BaseHasConfigureProtocol(classSymbol);
 
         string? @namespace = classSymbol.ContainingNamespace?.IsGlobalNamespace == true
             ? null
@@ -241,6 +242,7 @@ internal static class SemanticAnalyzer
                     isPartialClass,
                     derivesFromExecutor,
                     hasManualConfigureProtocol,
+                    baseHasConfigureProtocol,
                     classLocation,
                     typeName,
                     attributeKind));
@@ -321,7 +323,7 @@ internal static class SemanticAnalyzer
             first.GenericParameters,
             first.IsNested,
             first.ContainingTypeChain,
-            BaseHasConfigureProtocol: false, // Not relevant for protocol-only
+            first.BaseHasConfigureProtocol,
             Handlers: ImmutableEquatableArray<HandlerInfo>.Empty,
             ClassSendTypes: new ImmutableEquatableArray<string>(sendTypes.ToImmutable()),
             ClassYieldTypes: new ImmutableEquatableArray<string>(yieldTypes.ToImmutable()));
diff --git a/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Models/ClassProtocolInfo.cs b/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Models/ClassProtocolInfo.cs
index df9205cc5f..90e5762890 100644
--- a/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Models/ClassProtocolInfo.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Workflows.Generators/Models/ClassProtocolInfo.cs
@@ -16,6 +16,7 @@ namespace Microsoft.Agents.AI.Workflows.Generators.Models;
 /// <param name="IsPartialClass">Whether the class is declared as partial.</param>
 /// <param name="DerivesFromExecutor">Whether the class derives from Executor.</param>
 /// <param name="HasManualConfigureRoutes">Whether the class has a manually defined ConfigureRoutes method.</param>
+/// <param name="BaseHasConfigureProtocol">Whether a base class already overrides ConfigureProtocol.</param>
 /// <param name="ClassLocation">Location info for diagnostics.</param>
 /// <param name="TypeName">The fully qualified type name from the attribute.</param>
 /// <param name="AttributeKind">Whether this is from a SendsMessage or YieldsOutput attribute.</param>
@@ -29,6 +30,7 @@ internal sealed record ClassProtocolInfo(
     bool IsPartialClass,
     bool DerivesFromExecutor,
     bool HasManualConfigureRoutes,
+    bool BaseHasConfigureProtocol,
     DiagnosticLocationInfo? ClassLocation,
     string TypeName,
     ProtocolAttributeKind AttributeKind)
@@ -38,5 +40,5 @@ internal sealed record ClassProtocolInfo(
     /// </summary>
     public static ClassProtocolInfo Empty { get; } = new(
         string.Empty, null, string.Empty, null, false, string.Empty,
-        false, false, false, null, string.Empty, ProtocolAttributeKind.Send);
+        false, false, false, false, null, string.Empty, ProtocolAttributeKind.Send);
 }