Use Claude for Visual Classification

I would like to use Claude 3.5 Sonnet for objuect classification. In my specific case, I would like to detect whether a hand is present or not in the image. I added a Claude Block to my workflow and used the below code block. However, it does not work and I know there’s something I’m missing.

Is there a way to make this process easier?

{
  "type": "roboflow_core/anthropic_claude@v1",
  "name": "hand_detection",
  "images": "$inputs.image",
  "prompt": "Identify the hands in this images ",
  "task_type": "classification",
  "classes": [
    "hand",
    "no hand"
  ]
}