Update app.py

app.py

@@ -12,10 +12,9 @@ from Gradio_UI import GradioUI
 @tool
 def my_custom_tool(arg1:str)-> float: #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 does nothing yet 
+    """A tool that looks up stock prices
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        arg1: a string that corresponds to a stock market ticker (eg. TSLA for Tesla, AAPL, for Apple, MSFT for Microsoft, etc)
     """
     ticker = arg1
     stock = yf.Ticker(ticker)