---
title: customAttachment
framework: appintents
role: symbol
role_heading: Instance Property
path: appintents/appschema/messagesentity/customattachment
---

# customAttachment

An entity schema for a custom attachment.

## Declaration

```swift
var customAttachment: some AppSchemaEntity { get }
```

## Discussion

Discussion To make your app’s content available to Apple Intelligence, conform your AppEntity to a schema that describes your content to the system. If your app’s functionality aligns with the messages domain and its content matches the customAttachment schema, you can generate the properties and protocol conformance the schema requires for your app entity implementation with the @AppEntity( .messages.customAttachment) Swift macro. To make your app work with Siri, see Apple Intelligence and Siri AI. The following example shows an app entity that conforms to the customAttachment schema: @AppEntity(schema: .messages.customAttachment) struct CustomAttachment {     // MARK: Static

static let defaultQuery = CustomAttachmentQuery()

// MARK: Properties

let id: <#Identifiable.ID#>

var sourceName: AttributedString?     var description: AttributedString?

var displayRepresentation: DisplayRepresentation {         <#DisplayRepresentation#>     }

// MARK: Query

struct CustomAttachmentQuery: EntityQuery {         func entities(for identifiers: [CustomAttachment.ID]) async throws -> [CustomAttachment] {             <#code#>         }     } } 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

### Content and parameter types

- [conversation](appintents/appschema/messagesentity/conversation.md)
- [message](appintents/appschema/messagesentity/message.md)
- [messagePerson](appintents/appschema/messagesentity/messageperson.md)
- [AppSchema.MessagesEntity](appintents/appschema/messagesentity.md)