Update app.py

app.py

@@ -53,7 +53,7 @@ async def capture_screenshot():
         print("Screenshot saved!")
         
 @tool
-def grab_image() -> image:
+def grab_image() -> img:
      """
     Fetches an op art image from a p5 sketch.
     This function sends uses Playwright to launch a headles server and grab a screen shot of a p5.sketch.