curl --request POST \
  --url https://cloud.firebender.com/v0/agents/{id}/followup \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "prompt": {
    "text": "Add a README.md file with installation instructions",
    "images": [
      {
        "data": "iVBORw0KGgoAAAANSUhEUgAA...",
        "dimension": {
          "width": 2,
          "height": 2
        }
      }
    ]
  }
}
'

{
  "id": "fb_abc123xyz789",
  "message": "Follow-up sent to agent",
  "vmResponse": {}
}