fix: restarts conversation -> restart state['app']

app.py

@@ -1,7 +1,7 @@
 import uuid
 import os
 import gradio as gr
-
+from loguru import logger
 from langchain_core.messages import HumanMessage, AIMessage
 
 # Assuming mcpc_graph.py and its setup_graph function are in the same directory.
@@ -98,7 +98,7 @@ async def chat_logic(
             session_state["is_message_command"] = True
             yield interruption_message.value
             return  # Stop the stream and wait for the user's next message.
-
+        
 
 def create_gradio_app():
     """Creates and launches the Gradio web application."""
@@ -194,6 +194,28 @@ def create_gradio_app():
                     avatar_images=(None, AVATAR_BOT)
                     )
                 
+                # 🆕 add this helper next to create_gradio_app()
+                def _reset_agent(state: dict):
+                    """
+                    Runs when the user clicks the 🗑 button.
+
+                    Keeps the API credentials that live in the Textboxes and the env-vars,
+                    but forgets everything that makes the current LangGraph session unique,
+                    so the next user message starts from the root node again.
+                    """
+                    logger.info("Resetting the agent")
+                    state["app"] = None
+                    return state
+                
+
+                # 🆕 2. bind it to the built-in clear event --------------
+                chatbot.clear(
+                    _reset_agent,            # fn
+                    inputs=[session_state],         # what the fn receives
+                    outputs=[session_state],        # what the fn updates
+                )
+                # --------------------------------------------------------
+
 
                 gr.ChatInterface(
                     fn=chat_logic,