The issue still exists on iOS18 and beta 18.1. Entity import AppIntents struct CategoryEntity: AppEntity { var id: UUID var name: String init(name: String) { self.id = UUID() self.name = name } var displayRepresentation: DisplayRepresentation { DisplayRepresentation(title: LocalizedStringResource(stringLiteral: name)) } static let typeDisplayRepresentation: TypeDisplayRepresentation = "Category" static let defaultQuery = CategoryEntityQuery() } struct CategoryEntityQuery: EntityQuery { func entities(for identifiers: [CategoryEntity.ID]) async throws -> [CategoryEntity] { SampleData.categories } func suggestedEntities() async throws -> [CategoryEntity] { SampleData.categories } } struct SampleData { static var categories: [CategoryEntity] = [ .init(name: "Category 1"), .init(name: "Category 2"), .init(name: "Category 3"), .init(name: "Category 4"), .init(name: "Category 5") ] } Intent import AppIntents struct Intent: AppIntent { static let title: LocalizedStringResource = "Intent" static var parameterSummary: some ParameterSummary { Summary("Test \(\.$category)") { /// $hidden.requestValue() functions properly when it is included in the ParameterSummary // \.$hidden } } @Parameter(title: "Visible Category") var category: CategoryEntity? @Parameter(title: "Hidden Category") private var hidden: CategoryEntity? @MainActor func perform() async throws -> some ReturnsValue<CategoryEntity?> { let visible = try? await $category.requestValue("Select visible category") // Works as expected var hidden: CategoryEntity? /// Fails since iOS 18 because $hidden is not part of the ParameterSummary do { hidden = try await $hidden.requestValue("Select hidden category") } catch { /// Error Domain=NSCocoaErrorDomain Code=4099 "The connection from pid 11647 on anonymousListener or serviceListener was interrupted, but the message was sent over an additional proxy and therefore this proxy has become invalid." UserInfo={NSDebugDescription=The connection from pid 11647 on anonymousListener or serviceListener was interrupted, but the message was sent over an additional proxy and therefore this proxy has become invalid.} print(error) } let value = hidden ?? visible print("Category: \(value?.name ?? "none")") return .result(value: value) } }

Test project added to demonstrate the issue. FB14828592

I'm encountering the same issue, but it seems to have stopped working, likely since iOS 17. https://developer.apple.com/forums/thread/765516 FB14035016