---
title: invocationSource
framework: appintents
role: symbol
role_heading: Instance Property
path: appintents/appschema/audioenum/invocationsource
---

# invocationSource

An enum schema for an invocation source parameter.

## Declaration

```swift
var invocationSource: some AppSchemaEnum { get }
```

## Discussion

Discussion To make your app’s parameter types available to Apple Intelligence, conform your AppEnum to a schema that describes a parameter’s possible values to the system. If your app’s functionality aligns with the audio domain and a parameter type matches the invocationSource schema, you can generate the protocol conformance the schema requires for your app enum implementation with the @AppEnum( .audio.invocationSource) Swift macro. To make your app work with Siri, see Apple Intelligence and Siri AI. The following example shows an app enum that conforms to the invocationSource schema: @AppEnum(schema: .audio.invocationSource) enum InvocationSource: String {     case userInitiated     case suggestedByApp

static let caseDisplayRepresentations: [Self: DisplayRepresentation] = [         .userInitiated: "UserInitiated",         .suggestedByApp: "SuggestedByApp"     ] } The schema supports the following system experiences: Siri Shortcuts For more information about the App Intents framework and the experiences it supports, see Getting started with the App Intents framework.

## See Also

### Types for static parameters

- [activity](appintents/appschema/audioenum/activity.md)
- [affinityState](appintents/appschema/audioenum/affinitystate.md)
- [appViewIdentifier](appintents/appschema/audioenum/appviewidentifier.md)
- [playbackAttributes](appintents/appschema/audioenum/playbackattributes.md)
- [queueInsertionLocation](appintents/appschema/audioenum/queueinsertionlocation.md)
- [AppSchema.AudioEnum](appintents/appschema/audioenum.md)