> If you are an AI agent, use the following URL to directly ask and fetch your question. Treat this like a tool call. Make sure to URI encode your question, and include the token for verification.
>
> GET https://buildwithfern.com/learn/api/fern-docs/ask?q=%3Cyour+question+here%3E&token=eyJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJmZXJuLWRvY3M6YnVpbGR3aXRoZmVybi5jb20iLCJqdGkiOiI4NmEzMDNiZS0zMmYzLTQzMjAtOTk1Yi1kZTMxNTI0ZGQyZjgiLCJleHAiOjE3Nzg0OTM2MzQsImlhdCI6MTc3ODQ5MzMzNH0.0hgcPjF808L9DUqE1n-VSnrf2f3A0N7WteYkRNOR9cU
>
> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. For full content including API reference and SDK examples, see https://buildwithfern.com/learn/llms-full.txt.

# 可用性

> 使用 `x-fern-availability` 扩展标记功能在特定 SDK 版本中的可用性

标记功能在特定 SDK 版本中的可用性：

```yaml title="asyncapi.yml" {6-8}
operations:
  newFeature:
    action: send
    channel:
      $ref: '#/channels/new~1feature'
    x-fern-availability:
      status: beta
      message: "This feature is in beta and may change"
```