# Connect Customer agent workspace Extensibility API
<a name="api-reference-3P-apps-extensibility-client"></a>

With the Amazon Connect SDK, your app in the Connect Customer agent workspace can register and manage interceptors for UI actions by using `ExtensibilityService`.

You can instantiate the extensibility service as follows:

```
import { ExtensibilityService } from '@amazon-connect/extensibility';

const service = new ExtensibilityService(provider);
```

**Note**  
The `provider` is your `AmazonConnectProvider` instance — the same provider you use to initialize other `@amazon-connect/*` packages.

Interceptors are asynchronous callbacks. They run before a default UI action runs. To allow the default action, return `{ continue: true }` (or `true`). For example, you can require a disposition code in your app before a contact is cleared. To block the default action, return `{ continue: false }` (or `false`). When you block the default action, you can provide a custom experience. For example, you can present your own Quick Connect experience instead of the built-in one.

The framework accepts any string as an interceptor key, but only keys that the UI actively invokes have an effect. The following table lists the currently supported keys.


| **Key** | **Triggers when** | **Context** | 
| --- | --- | --- | 
| openQuickConnect | The user chooses the Quick Connect or transfer button | { contactId?: string } | 
| openOutboundDialer | The user chooses the number pad or outbound dialer | { contactId?: string } | 
| clearContact | The user chooses to clear or end a contact | { contactId?: string } | 

**Topics**
+ [addInterceptor()](3P-apps-extensibility-add-interceptor.md)
+ [removeInterceptor()](3P-apps-extensibility-remove-interceptor.md)
+ [Interceptor callback](3P-apps-extensibility-interceptor-type.md)
+ [Options](3P-apps-extensibility-options.md)
+ [Interceptor behavior](3P-apps-extensibility-behavior.md)