Update app.py

app.py

@@ -24,8 +24,8 @@ def inspect_directory(directory: str, prefix: str = '') -> str:
     A tool that generates a visual tree structure of the directory contents.
 
     Args:
-        directory (str): The path to the directory to inspect.
-        prefix (str): The prefix string used for formatting the tree structure.
+        directory: The path to the directory to inspect.
+        prefix: (optional) The prefix string used for formatting the tree structure.
 
     Returns:
         str: A string representing the tree structure of the directory.