.NET: Fix JailbreakSyncExecutor and FinalOutputExecutor to use List<C…

dotnet/samples/GettingStarted/Workflows/_Foundational/07_MixedWorkflowAgentsAndExecutors/Program.cs

@@ -230,14 +230,15 @@ public override async ValueTask HandleAsync(string message, IWorkflowContext con
 /// Executor that synchronizes agent output and prepares it for the next stage.
 /// This demonstrates how executors can process agent outputs and forward to the next agent.
 /// </summary>
-internal sealed class JailbreakSyncExecutor() : Executor<ChatMessage>("JailbreakSync")
+internal sealed class JailbreakSyncExecutor() : Executor<List<ChatMessage>>("JailbreakSync")
 {
-    public override async ValueTask HandleAsync(ChatMessage message, IWorkflowContext context, CancellationToken cancellationToken = default)
+    public override async ValueTask HandleAsync(List<ChatMessage> message, IWorkflowContext context, CancellationToken cancellationToken = default)
     {
         Console.WriteLine(); // New line after agent streaming
         Console.ForegroundColor = ConsoleColor.Magenta;
 
-        string fullAgentResponse = message.Text?.Trim() ?? "UNKNOWN";
+        ChatMessage agentResponse = message.LastOrDefault(m => m.Role.Equals(ChatRole.Assistant), new ChatMessage(ChatRole.Assistant, string.Empty));
+        string fullAgentResponse = agentResponse.Text?.Trim() ?? "UNKNOWN";
 
         Console.WriteLine($"[{this.Id}] Full Agent Response:");
         Console.WriteLine(fullAgentResponse);
@@ -278,17 +279,21 @@ public override async ValueTask HandleAsync(ChatMessage message, IWorkflowContex
 /// <summary>
 /// Executor that outputs the final result and marks the end of the workflow.
 /// </summary>
-internal sealed class FinalOutputExecutor() : Executor<ChatMessage, string>("FinalOutput")
+internal sealed class FinalOutputExecutor() : Executor<List<ChatMessage>, string>("FinalOutput")
 {
-    public override ValueTask<string> HandleAsync(ChatMessage message, IWorkflowContext context, CancellationToken cancellationToken = default)
+    public override ValueTask<string> HandleAsync(List<ChatMessage> message, IWorkflowContext context, CancellationToken cancellationToken = default)
     {
+        var lastMessage = message.LastOrDefault(m => m.Role.Equals(ChatRole.Assistant), new ChatMessage(ChatRole.Assistant, string.Empty));
         Console.WriteLine(); // New line after agent streaming
         Console.ForegroundColor = ConsoleColor.Green;
         Console.WriteLine($"\n[{this.Id}] Final Response:");
-        Console.WriteLine($"{message.Text}");
+        // Safely print the assistant text - normalize null to empty string before printing and returning.
+        string assistantText = lastMessage.Text ?? string.Empty;
+        Console.WriteLine(assistantText);
         Console.WriteLine("\n[End of Workflow]");
         Console.ResetColor();
 
-        return ValueTask.FromResult(message.Text ?? string.Empty);
+        // Ensure we never return null
+        return ValueTask.FromResult(assistantText);
     }
 }