add validation check on text_input

app.py

@@ -20,8 +20,13 @@ class EggTartAgentUI(GradioUI):
         self.description = app_description
         self.example_questions = example_questions
 
+    def validate_question_length(self, question):
+        if len(question.strip()) < 20:
+            raise gr.Error("Please enter a question with at least 20 characters.")
+
     def interact_with_agent(self, prompt, messages, session_state):
-        import gradio as gr
+
+        self.validate_question_length(prompt)
 
         # Get the agent type from the template agent
         if "agent" not in session_state: