diff --git a/app/MindWork AI Studio/Assistants/AssistantBase.razor.cs b/app/MindWork AI Studio/Assistants/AssistantBase.razor.cs
index 4d6fde09..f655ea77 100644
--- a/app/MindWork AI Studio/Assistants/AssistantBase.razor.cs	
+++ b/app/MindWork AI Studio/Assistants/AssistantBase.razor.cs	
@@ -753,9 +753,7 @@ public abstract partial class AssistantBase<TSettings> : AssistantLowerBase wher
         await this.AssistantSessionService.ClearAsync(this.assistantSessionKey);
         this.MediaTranscriptionService.ClearOwnerState(this.CurrentMediaImportOwner);
         this.assistantSessionId = null;
-        this.ChatThread = null;
-        this.LastUserPrompt = null;
-        this.ResultingContentBlock = null;
+        this.ClearConversationState();
         this.ProviderSettings = Settings.Provider.NONE;
         
         await this.JsRuntime.ClearDiv(BEFORE_RESULT_DIV_ID);
diff --git a/app/MindWork AI Studio/Assistants/AssistantLowerBase.cs b/app/MindWork AI Studio/Assistants/AssistantLowerBase.cs
index fff83be6..bfde4c2d 100644
--- a/app/MindWork AI Studio/Assistants/AssistantLowerBase.cs	
+++ b/app/MindWork AI Studio/Assistants/AssistantLowerBase.cs	
@@ -34,4 +34,18 @@ public abstract class AssistantLowerBase : MSGComponentBase
     protected ContentBlock? ResultingContentBlock;
     protected string[] InputIssues = [];
     protected bool IsProcessing;
+
+    /// <summary>
+    /// Clears everything one assistant run has produced.
+    /// </summary>
+    /// <remarks>
+    /// Assistants call this whenever the previous run must not carry over: a follow-up run would
+    /// otherwise append to the old chat thread, and the old result would stay on screen.
+    /// </remarks>
+    protected void ClearConversationState()
+    {
+        this.ChatThread = null;
+        this.LastUserPrompt = null;
+        this.ResultingContentBlock = null;
+    }
 }
\ No newline at end of file
diff --git a/app/MindWork AI Studio/Assistants/PromptOptimizer/AssistantPromptOptimizer.razor.cs b/app/MindWork AI Studio/Assistants/PromptOptimizer/AssistantPromptOptimizer.razor.cs
index 11694b70..9aa01832 100644
--- a/app/MindWork AI Studio/Assistants/PromptOptimizer/AssistantPromptOptimizer.razor.cs	
+++ b/app/MindWork AI Studio/Assistants/PromptOptimizer/AssistantPromptOptimizer.razor.cs	
@@ -479,9 +479,7 @@ public partial class AssistantPromptOptimizer : AssistantBaseCore<SettingsDialog
 
         this.inputPrompt = this.optimizedPrompt;
         this.ResetOutput();
-        this.ChatThread = null;
-        this.LastUserPrompt = null;
-        this.ResultingContentBlock = null;
+        this.ClearConversationState();
         this.ClearInputIssues();
         return Task.CompletedTask;
     }