add a calculator

app.py

@@ -1,4 +1,5 @@
 # Super minimal app.py for troubleshooting
+from json import tool
 import gradio as gr
 import sys
 
@@ -12,11 +13,18 @@ for name, module in sys.modules.items():
 # Simple function that doesn't require any ML models
 def echo(text):
     return f"You said: {text}"
+  
+@tool
+def calculator(a: int, b: int) -> int:
+    """Multiply two integers."""
+    return a * b
+
+print(calculator.to_string())
 
 # Create a simple Gradio interface
 demo = gr.Interface(
-    fn=echo,
-    inputs=gr.Textbox(placeholder="Type something here..."),
+    fn=calculator,
+    inputs=gr.Textbox(placeholder="Enter two numbers you want to multiply..."),
     outputs=gr.Textbox(),
     title="Micro Learning Platform - Debug Version",
     description="This is a minimal version for troubleshooting"