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# AccessoryFeature

A protocol that defines a capability for an accessory data provider extension.

```
protocol AccessoryFeature : Sendable, AppExtensionPoint.Capability
```

## Overview

Implement this protocol to create a custom capability that your extension supports. Each feature has an associated handler type that processes events for that capability.

## Topics

### Identifying the feature

[`static var featureID: String`](/documentation/AccessoryTransportExtension/AccessoryFeature/featureID)

A string identifier for the feature.

## Relationships

### Inherits From

[`Sendable`](/documentation/Swift/Sendable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Identifiable`](/documentation/Swift/Identifiable)

[`Capability`](/documentation/ExtensionFoundation/AppExtensionPoint/Capability)

---

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