---
title: messageEffect
framework: appintents
role: symbol
role_heading: Instance Property
path: appintents/appschema/messagesenum/messageeffect
---

# messageEffect

An enum schema for a message effect parameter.

## Declaration

```swift
var messageEffect: 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 messages domain and a parameter type matches the messageEffect schema, you can generate the protocol conformance the schema requires for your app enum implementation with the @AppEnum( .messages.messageEffect) 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 messageEffect schema: @AppEnum(schema: .messages.messageEffect) enum MessageEffect: String {     case <#MessageEffect Case#>

static let caseDisplayRepresentations: [Self: DisplayRepresentation] = [         <#DisplayRepresentations#>     ] } 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

- [conversationAttribute](appintents/appschema/messagesenum/conversationattribute.md)
- [customReaction](appintents/appschema/messagesenum/customreaction.md)
- [messageAttribute](appintents/appschema/messagesenum/messageattribute.md)
- [messageType](appintents/appschema/messagesenum/messagetype.md)
- [AppSchema.MessagesEnum](appintents/appschema/messagesenum.md)