curl --request POST \
  --url https://api.trymaitai.ai/api/v1/agents/{agent_id}/subagents \
  --header 'Content-Type: application/json' \
  --header 'X-Maitai-Api-Key: <api-key>' \
  --data '
{
  "child_agent_id": 55
}
'

{
  "data": {
    "message": "Sub-agent added"
  }
}