fix tool annotation

app.py

@@ -36,21 +36,16 @@ Adhere strictly to these rules:
 Begin.
 """
 
-@tool(
-    name="gaia_file_fetch",
-    description=textwrap.dedent(
-        """\
-        Download the file attached to a GAIA task.  
-        • Input: task_id (string)  
-        • Output: text content (truncated to 20 000 chars) or a notice for binary files.
-        """
-    ),
-)
+@tool
 def gaia_file_fetch(task_id: str) -> str:
-    """Sync helper the agent can call."""
+    """
+    Download the file attached to a GAIA task.
+
+    • Input:  task_id (string)  
+    • Output: text content (first 20 000 chars) or a notice if the file is binary.
+    """
     url = f"https://{GAIA_HOST}/files/{task_id}"
     resp = requests.get(url, timeout=15)
-
     if resp.status_code != 200:
         return f"ERROR {resp.status_code}: could not fetch file."