diff --git a/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs b/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs
index 6088ca46a..3ae30059f 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs
@@ -64,16 +64,11 @@ public static string CleanStr(this string? str)
         return str.Replace(" ", "").Replace("\t", "").Replace("\n", "").Replace("\r", "");
     }
 
-    [GeneratedRegex(@"[^\u0000-\u007F]")]
-    private static partial Regex NonAsciiCharactersRegex();
-
     public static string CleanJsonStr(this string? str)
     {
         if (string.IsNullOrWhiteSpace(str)) return string.Empty;
 
-        str = str.Replace("```json", string.Empty).Replace("```", string.Empty).Trim();
-
-        return NonAsciiCharactersRegex().Replace(str, "");
+        return str.Replace("```json", string.Empty).Replace("```", string.Empty).Trim();
     }
 
     public static T? Json<T>(this string text)
diff --git a/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Execute.cs b/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Execute.cs
index 13112c2ad..8a1e32c8d 100644
--- a/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Execute.cs
+++ b/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Execute.cs
@@ -295,7 +295,7 @@ private async Task<InstructResult> RunLlm(
                 result = await GetChatCompletion(chatCompleter, agent, instruction, prompt, message.MessageId, files);
             }
             // Repair JSON format if needed
-            responseFormat = responseFormat ?? agentService.GetTemplateResponseFormat(agent, templateName);
+            responseFormat ??= agentService.GetTemplateResponseFormat(agent, templateName);
             if (responseFormat == ResponseFormatType.Json)
             {
                 var jsonRepairService = _services.GetRequiredService<IJsonRepairService>();
diff --git a/src/Infrastructure/BotSharp.OpenAPI/Controllers/Instruct/InstructModeController.cs b/src/Infrastructure/BotSharp.OpenAPI/Controllers/Instruct/InstructModeController.cs
index 344f0758b..9f5cb69b7 100644
--- a/src/Infrastructure/BotSharp.OpenAPI/Controllers/Instruct/InstructModeController.cs
+++ b/src/Infrastructure/BotSharp.OpenAPI/Controllers/Instruct/InstructModeController.cs
@@ -65,7 +65,8 @@ public async Task InstructCompletionSse([FromRoute] string agentId, [FromBody] I
             templateName: input.Template,
             files: input.Files,
             codeOptions: input.CodeOptions,
-            fileOptions: input.FileOptions);
+            fileOptions: input.FileOptions,
+            responseFormat: input.ResponseFormat);
 
         result.States = state.GetStates();