import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const response = await client.messaging.rcs.retrieveCapabilities('phone_number', { agent_id: 'agent_id' });

console.log(response.data);

{
  "data": {
    "record_type": "rcs.capabilities",
    "phone_number": "+13125551234",
    "agent_id": "TestAgent",
    "agent_name": "Testing agent",
    "features": [
      "<string>"
    ]
  }
}