Update app.py

app.py

@@ -56,7 +56,7 @@ async def capture_screenshot():
         print("Screenshot saved!")
         
 @tool
-def grab_image(): -> image:
+def grab_image() -> image:
     """
     Fetches an op art image from a p5.js sketch.
     This function sends uses Playwright to launch a headless server and grab a screenshot of a p5.js sketch.