Update app.py

app.py

@@ -9,7 +9,7 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def image_generation_tool(prompt: str)-> str: #it's import to specify the return type
+def image_generation_tool(prompt: str)-> image_generation_tool: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that generates an image based on a prompt 
     Args: