## BaseAgentMessage.callback property [​](/content/docs/sdk/core.baseagentmessage.callback#baseagentmessagecallback-property "Direct link to BaseAgentMessage.callback property"/index.html)

**Signature:**

```typescript
callback?: string;
```

- [BaseAgentMessage.callback property](/content/docs/sdk/core.baseagentmessage.callback#baseagentmessagecallback-property/index.html)