Fix router history dialogs.

src/Infrastructure/BotSharp.Abstraction/Conversations/Models/RoleDialogModel.cs

@@ -30,7 +30,7 @@ public class RoleDialogModel : ITrackableMessage
     public string? SecondaryContent { get; set; }
 
     /// <summary>
-    /// Postback content
+    /// Postback of previous round payload
     /// </summary>
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     [JsonPropertyName("payload")]
@@ -131,6 +131,7 @@ public class RoleDialogModel : ITrackableMessage
             ToolCallId = source.ToolCallId,
             PostbackFunctionName = source.PostbackFunctionName,
             RichContent = source.RichContent,
+            Payload = source.Payload,
             StopCompletion = source.StopCompletion,
             Instruction = source.Instruction,
             Data = source.Data,

src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.SendMessage.cs

@@ -41,7 +41,7 @@ public partial class ConversationService
         routing.Context.SetMessageId(_conversationId, message.MessageId);
         routing.Context.Push(agent.Id, reason: "request started");
 
-        // Save payload
+        // Save payload in order to assign the payload before hook is invoked
         if (replyMessage != null && !string.IsNullOrEmpty(replyMessage.Payload))
         {
             message.Payload = replyMessage.Payload;

src/Infrastructure/BotSharp.Core/Routing/RoutingService.GetConversationContent.cs

@@ -16,7 +16,15 @@ public partial class RoutingService
                 role = agent.Name;
             }
 
-            conversation += $"{role}: {dialog.Payload ?? dialog.Content}\r\n";
+            if (role == AgentRole.User)
+            {
+                conversation += $"{role}: {dialog.Payload ?? dialog.Content}\r\n";
+            }
+            else
+            {
+                // Assistant reply deosn't need help with payload
+                conversation += $"{role}: {dialog.Content}\r\n";
+            }
         }
 
         return conversation;