Update app.py

update description in tool to see if the agent will return an image if I ask what it looks like

app.py

@@ -102,10 +102,12 @@ async def capture_screenshot(image_type: str):
 @tool
 def grab_image(image_type: str) -> Image:
     """
-    Fetches an op art image from a p5.js sketch.
+    Fetches an user specified image or generative object from a p5.js sketch.
+    This tool can be used to show a user what the generative art looks like.
     This function sends uses Playwright to launch a headless server and grab a screenshot of a p5.js sketch.
     Args:
-        image_type: A geneerate art type
+        image_type: The art type or generative object. 
+        
     Returns:
         image: The screen shot of the p5.js sketch as an image.
     """