---
title: customReaction
framework: appintents
role: symbol
role_heading: Instance Property
path: appintents/appschema/messagesenum/customreaction
---

# customReaction

An enum schema for a custom reaction parameter.

## Declaration

```swift
var customReaction: 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 customReaction schema, you can generate the protocol conformance the schema requires for your app enum implementation with the @AppEnum( .messages.customReaction) 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 customReaction schema: @AppEnum(schema: .messages.customReaction) enum Tapback: String {     case <#Tapback 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)
- [messageAttribute](appintents/appschema/messagesenum/messageattribute.md)
- [messageEffect](appintents/appschema/messagesenum/messageeffect.md)
- [messageType](appintents/appschema/messagesenum/messagetype.md)
- [AppSchema.MessagesEnum](appintents/appschema/messagesenum.md)