curl --request GET \
  --url https://api.agents.slng.ai/v1/agents/{agent_id}/calls \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "id": "550e8400-e29b-41d4-a716-446655440000",
      "agent_id": "550e8400-e29b-41d4-a716-446655440000",
      "phone_number": "<string>",
      "call_direction": "<string>",
      "arguments": {},
      "rendered_prompt": "<string>",
      "livekit_room_name": "<string>",
      "status": "<string>",
      "created_at": "2026-01-15T10:30:00Z",
      "updated_at": "2026-01-15T10:30:00Z",
      "livekit_dispatch_id": "<string>",
      "call_started_at": "2026-01-15T10:30:00Z",
      "call_ended_at": "2026-01-15T10:30:00Z",
      "call_duration_ms": 123,
      "call_end_reason": "<string>",
      "finalized_at": "2026-01-15T10:30:00Z",
      "call_duration_source": "<string>",
      "error_message": "<string>"
    }
  ],
  "meta": {
    "page": 2,
    "page_size": 2,
    "total": 1,
    "pages": 1
  }
}