curl --request GET \
  --url https://api.example.com/v1/voiceai/agents/{agent_id}

{
  "agent_id": "<string>",
  "name": "<string>",
  "conversation_config": {
    "language": "<string>",
    "voice_id": "<string>",
    "first_message": "<string>",
    "system_prompt": "<string>",
    "temperature": 123,
    "use_rag": true,
    "tools": [
      {
        "name": "<string>",
        "description": "<string>",
        "enabled": true
      }
    ]
  },
  "created_at": 123,
  "phone_number_id": "<string>",
  "knowledge_base": [],
  "phone_numbers": []
}