curl --request POST \
  --url https://api.coval.dev/v1/agents/{agent_id}/mutations \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "display_name": "GPT-4 Fast VAD",
  "config_overrides": {
    "voice": "nova",
    "vad_stop_secs": 0.3
  }
}
'

{
  "mutation": {
    "id": "01ARZ3NDEKTSV4RRFFQ69G5FAX",
    "created_at": "2025-10-16T09:00:00Z",
    "created_by": "01J000000000000000000000001",
    "updated_at": null,
    "updated_by": null,
    "agent_id": "gk3jK9mPq2xRt5vW8yZaBc",
    "display_name": "GPT-4 Fast VAD",
    "description": "",
    "config_overrides": {
      "voice": "nova",
      "vad_stop_secs": 0.3
    },
    "parameter_values": {
      "voice": "nova",
      "vad_stop_secs": "0.3"
    },
    "create_time": "2025-10-16T09:00:00Z",
    "update_time": null
  }
}