Update app.py

app.py

@@ -16,7 +16,13 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 # ----- THIS IS WERE YOU CAN BUILD WHAT YOU WANT ------
 @tool
 def read_files(file_path: str) -> str:
-    """Read the the local attachment file and return its content or text"""
+    """Read the the local attachment file and return its content or text
+    Args:
+        file_path: Path to the local file attachment to read.
+
+    Returns: 
+        The file content as text, or an error message.
+    """
     path = Path(file_path)
     if not path.exists():
         return f"File {file_path} does not exist."