Rollback.

src/Infrastructure/BotSharp.Abstraction/Routing/Models/RoutingArgs.cs

@@ -9,12 +9,10 @@ public class RoutingArgs
     public string Reason { get; set; } = string.Empty;
 
     [JsonPropertyName("answer")]
-    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public string? Answer { get; set; }
+    public string Answer { get; set; } = string.Empty;
 
     [JsonPropertyName("agent")]
-    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public string? AgentName { get; set; }
+    public string AgentName { get; set; } = string.Empty;
 
     public override string ToString()
     {

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

@@ -9,23 +9,13 @@ public partial class RoutingService
 {
     public async Task<FunctionCallFromLlm> GetNextInstruction(string prompt)
     {
-        var responseRouteToAgent = _settings.EnableReasoning ?
+        var responseFormat = _settings.EnableReasoning ?
             JsonSerializer.Serialize(new FunctionCallFromLlm()) :
             JsonSerializer.Serialize(new RoutingArgs
             {
-                Function = "route_to_agent",
-                AgentName = ""
+                Function = "route_to_agent"
             });
-
-        var responseResponseToUser = _settings.EnableReasoning ?
-            JsonSerializer.Serialize(new FunctionCallFromLlm()) :
-            JsonSerializer.Serialize(new RoutingArgs
-            {
-                Function = "response_to_user",
-                Answer = ""
-            });
-
-        var content = $"{prompt}\r\nIf need to route to specific agent, output in JSON {responseRouteToAgent}.\r\nIf you can handle the request directly, output in JSON {responseResponseToUser}.";
+        var content = $"{prompt} Response must be in JSON format {responseFormat}";
 
         var state = _services.GetRequiredService<IConversationStateService>();