curl --request POST \
  --url https://api.cursor.com/v0/agents/{id}/followup \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": {
    "text": "Also add a section about troubleshooting",
    "images": [
      {
        "data": "iVBORw0KGgoAAAANSUhEUgAA...",
        "dimension": {
          "width": 1024,
          "height": 768
        }
      }
    ]
  }
}'

{
  "id": "bc_abc123"
}