curl --request GET \
  --url https://api.getoutbox.ai/agent/list \
  --header 'Authorization: <api-key>'

{
  "results": [
    {
      "id": "<string>",
      "name": "<string>",
      "variables": [
        {
          "variable": "<string>",
          "default": "<string>",
          "name": "<string>"
        }
      ]
    }
  ],
  "total": 123
}