What do you need?
|
+-- Expose an action to Siri/Shortcuts
|   +-- Simple action, no UI needed
|   |   --> Basic AppIntent (intents-basics.md)
|   +-- Needs to show UI or ask user questions
|   |   --> Intent Modes + Interactive Snippets (advanced-features.md)
|   +-- Needs a predictable voice phrase
|       --> App Shortcuts (intents-basics.md)
|
+-- Make content searchable
|   +-- In Spotlight
|   |   --> IndexedEntity + @Property (entities-spotlight.md)
|   +-- In Visual Intelligence
|   |   --> IntentValueQuery + SemanticContentDescriptor (advanced-features.md)
|   +-- As onscreen entities for Siri/ChatGPT
|       --> .userActivity() + EntityIdentifier (advanced-features.md)
|
+-- Show rich results in Siri
|   +-- Static display only
|   |   --> .result(view:) snippet (advanced-features.md)
|   +-- Interactive buttons/controls
|       --> SnippetIntent protocol (advanced-features.md)
|
+-- Present choices to the user
|   --> requestChoice(between:) (advanced-features.md)
|
+-- Share intents via Swift Package
    --> AppIntentsPackage protocol (advanced-features.md)

// ❌ Wrong -- no title or description
struct MyIntent: AppIntent {
    func perform() async throws -> some IntentResult {
        return .result()
    }
}

// ✅ Correct -- static title is required
struct MyIntent: AppIntent {
    static var title: LocalizedStringResource = "Do Something"
    static var description: IntentDescription = "Performs the action"

    func perform() async throws -> some IntentResult {
        return .result()
    }
}

// ❌ Wrong -- entities updated but Spotlight not notified
func saveRecipe(_ recipe: Recipe) {
    database.save(recipe)
}

// ✅ Correct -- reindex after mutations
func saveRecipe(_ recipe: Recipe) async throws {
    database.save(recipe)
    try await CSSearchableIndex.default().indexAppEntities()
}

// ❌ Wrong -- forces app to foreground for a simple toggle
struct ToggleFavoriteIntent: AppIntent {
    static var title: LocalizedStringResource = "Toggle Favorite"
    static var openAppWhenRun = true  // Unnecessary

    func perform() async throws -> some IntentResult {
        toggleFavorite()
        return .result()
    }
}

// ✅ Correct -- runs silently in background
struct ToggleFavoriteIntent: AppIntent {
    static var title: LocalizedStringResource = "Toggle Favorite"

    var supportedModes: IntentModes { .background }

    func perform() async throws -> some IntentResult {
        toggleFavorite()
        return .result()
    }
}

// ❌ Wrong -- entity has no way to be queried
struct NoteEntity: AppEntity {
    var id: String
    var title: String
    // Missing: static var defaultQuery
}

// ✅ Correct -- provides a query so Siri can resolve entities
struct NoteEntity: AppEntity {
    var id: String
    var title: String

    static var defaultQuery = NoteEntityQuery()
    // ... typeDisplayRepresentation, displayRepresentation
}

// ❌ Wrong -- indexing thousands of items at once blocks the main thread
func indexAll() async throws {
    let allItems = database.fetchAll()  // 50,000 items
    try await CSSearchableIndex.default().indexAppEntities()
}

// ✅ Correct -- batch index and run off main thread
func indexAll() async throws {
    try await CSSearchableIndex.default().indexAppEntities(
        of: RecipeEntity.self
    )
}