Minor structural additions — new module imports (DataDetection, SwiftUI, _Concurrency) with no API surface changes.

New private framework _ScreenCaptureKit_SwiftUI introduces a View.recordingEditor(_:) SwiftUI modifier for embedding a ScreenCaptureKit recording editor into a view hierarchy.

New framework — LinkSecurity is newly available as a Swift module with no public API surface exposed yet beyond its imports.

The UTType resolution strategy API (UTTypeResolutionStrategy, UTTypeHierarchyStrategy, UTTypeResolutionResult) has been removed entirely, and SpotlightSearchTool.Configuration gains a maximumResponseSize parameter in its initializer.

The framework now re-exports RealityKit directly, while Address (including its Codable members) and ParameterHandle have been removed.

All top-level render data types (MeshData, MaterialData, DeformationData, TextureData, and their ID/helper types) have been moved inside USDPlayer as nested types, breaking any existing code that references them at the module level.

• UsdRenderMessage and the Name.USDStageKitRenderComplete notification constant have been removed with no replacement.
• FrameUpdate.timestamp is replaced by timeCode, and importCustomIBLTexture(data:) now throws and returns the nested USDPlayer.TextureData instead of the optional top-level type.

New API to query whether "Application Accessibility" is enabled system-wide (AXApplicationAccessibilityEnabled) and observe changes to that setting via a notification/message identifier.

New AccessoryFeatureSession protocol introduced, enabling extensions to send messages and identify sessions via sessionID.

A large set of Assistant Schema intent/entity conformance points were removed (AppStore, ImageGeneration, several Mail/Browser/Presentation/Photos schemas), while a small number of new schema hooks and query capabilities were added.

• Several AssistantSchemas and AppSchema protocol namespaces were removed outright (e.g., AppStoreEntity/Intent, ImageGenerationEntity/Enum/Intent, PresentationEnum), breaking any app that adopted those schemas.
• New additions include AppSchema.SystemIntent.searchInApp, AppSchema.ClockEnum.stopwatchState, IntentValueQuery.allowedExecutionTargets, and CSSearchableItemAttributeSet.relatedAppEntityIdentifier.
• IntentResponseStream.append(entity:) was removed, and CalendarIntent.deleteEvents was renamed to deleteEvent (singular).

New error cases on AppManagedFeaturesError cover three failure conditions: notAuthorized, notAvailable, and prohibitedWatchExtensionFound.

New API extends external sync device support with a signal-compensation-delay capability query and a rotation-angle helper keyed to device orientation, while AVCaptureVideoOrientation (already deprecated) moves from AVCaptureSession.h to AVCaptureDevice.h with iOS availability now kept open (not deprecated on iOS).

A new AVPlaybackUserInterfaceControllable protocol family has been added, enabling custom playback UI implementations to control and observe playback state, timeline, media selection, volume, and metadata on non-iOS platforms.

• The AVInterfaceControllable types (previously iOS-only, blocked on Mac Catalyst) are now available on Mac Catalyst as well, removing the API_UNAVAILABLE(macCatalyst) restriction.
• The parallel AVPlaybackUserInterface* protocol suite (AVPlaybackUserInterfaceControllable and its sub-protocols) is currently marked unavailable on all shipping platforms, indicating a forward declaration for a future platform.

Minor annotation fix — NS_REFINED_FOR_SWIFT moved from the typedef line to the closing brace on two enums (AVSystemRouteLaunchMode, AVSystemRouteEventReason), with no behavioral change.

Two API variants on BEWebContentFilter were removed and replaced with more specific versions, and the BEWebContentFilterPermissionDecision enum gained a Swift-friendly nested name.

• The evaluateURL:mainDocumentURL:completionHandler: method was removed in favor of evaluateURL:mainFrameURL:isMainFrame:completionHandler:.
• The view-less requestPermissionForURL:referrerURL:completionHandler: overload was removed; callers must now pass a presentingView.

BEBrowserContentFilter is now available on macOS 27.0 in addition to iOS 27.0.

CPMapPanelButtonConfiguration renames symbolButton to secondaryButton and makes travelEstimates mutable — existing code using the old parameter label or treating travelEstimates as read-only will break.

• CPNavigationSession gains routeSharingEnabled and routeSharingSupported properties (iOS 27), with a corresponding mapTemplate:didUpdateRouteSharingEnabled: delegate callback.
• CPMultiStopCardConfiguration adds an initializer and property to attach a UIImage to the card.
• CPPanel replaces the instance identifier property with a class-level maximumPanelItemsCount and a new showsCloseButton toggle.

The Charts framework's ViewBuilder overloads for buildEither(first:) and buildEither(second:) have been removed, which may break conditional chart-content expressions that relied on these builder methods.

New HeadroomAdaptiveGainCurve API lets developers embed HDR headroom/tone-mapping metadata into ColorSyncProfile, describing adaptive gain curves with configurable color volume transforms, tone-mapping methods (reference-white-based or custom spline control points), and target chromaticities (BT.709, BT.2020, Display P3, or custom).

NodeDefinition.Kind enum cases now take a framework-owned ComputeNodeGraph.DataType instead of Metal.MTLDataType, breaking all call sites that construct node definitions with Metal data types directly.

• The Topology enum and ComputeGraphSimulation simulation-state properties (graphParametersBuffer, outputIds) have been removed entirely.
• Structure-related enum cases (StateType.structure, ValueType.structure) now take a StructureDefinition value object instead of separate typeName/layout arguments.
• ComputeNodeGraph gains serialization support via data(using:) and a new Format enum (JSON and property list), plus a data:-based initializer for deserialization.

The CodingKeys enums for CGColor and CGColorSpace (used to support Codable serialization of those types) have been removed.

New estimateRender:fromRect:toDestination:atPoint:error: method on CIContext allows asynchronous render-cost estimation without committing a full render pass.

CTCellularPlanStatus gains iOS 27 APIs for phone-number authorization and availability hints, and CTSlicingManager.AppCategory.browsers is renamed to webBrowser.

• CTCellularPlanStatus adds requestAuthorizationForPhoneNumber:, getAuthorizationStatusForPhoneNumber:, and getStatusHintForPhoneNumber:, backed by new Authorization, Availability, and AvailabilityConfidence enums.
• CTQuickSwitch changes registerForLaunchOnQuickSwitchStateEvents: and its unregister counterpart from instance methods to class methods, which is a breaking change for existing callers.

New TKErrorCode.invalidatedDeviceKey error code added to signal that a device key has been invalidated.

The AppExtensionPoint.Scope.Restriction.none enum case has been removed, which is a breaking change for any code that matches or assigns that value.

Namespace policy APIs, previously marked unavailable on all platforms, are now available starting in macOS 27 and iOS 27.

AnyTool and the Result enum have been removed, breaking existing tool-wrapping code, while LanguageModelError.Refusal gains an explanation/explanationStream for surfacing refusal reasons to users.

• DynamicInstructionsForEach is now a public concrete struct (replacing the internal _DynamicInstructionsForEach), and DynamicInstructionsBuilder/DynamicProfileBuilder gain buildLimitedAvailability support for availability-gated instructions.
• promptRepresentation and instructionsRepresentation are now available on primitive Swift types (Bool, Int, Double, Float, Decimal) and on Generable, expanding what can be passed directly as prompt/instruction content.
• LanguageModelSession.AnyDynamicProfile is a new type-erased wrapper for dynamic session profiles, and DynamicProfile gains a model(_:) method for specifying the model per profile.

HKHealthStore gains a new API to query the earliest authorized sample date across multiple types at once, and HKWorkoutZoneConfiguration.ConfigurationType (with its automatic/custom/manual cases) has been removed entirely.

Two new IPTC extension metadata keys allow reading and writing AI provenance information (kCGImagePropertyIPTCExtAISystemUsed and kCGImagePropertyIPTCExtAISystemVersionUsed) in image properties.

New dependency on QuartzCore is now imported by the framework.

Four new provisional clusters are added (ElectricalDistribution, ElectricalProtectionAlarm, DynamicLighting, SmokeConcentrationMeasurement), while the previously provisional Timer cluster is removed entirely.

• The JointFabricDatastore access-control enums have breaking raw-value renumbering (e.g., AuthModePASE shifts from 0→1, PrivilegeView from 0→1), which will silently corrupt any code that stored or compared those values numerically.
• Two new device type IDs are added (HumidifierDehumidifier, ElectricalDistributionEnclosure), and all concentration-measurement clusters gain two new MeasurementUnit cases (DBPM, PCFT).

The internal Core Data persistence layer (MIDataStore, MIManagedFace, and related types) has been removed from the public API surface.

The AudioSearch.SpotlightResult type and the associated spotlightSearchResults parameter have been removed, and AudioSearch now initializes with init(criteria:) alone.

MPSGraphSDPADescriptor and its scaledDotProductAttention method have been bumped from macOS/iOS 26 to 27, making them unavailable in the current release.

• convertLayoutToNHWC on MPSGraphCompilationDescriptor is deprecated immediately (available since 26.4), replaced by the new disableAutoLayoutConversion — NHWC layout conversion is now on by default on M5 and newer hardware.

Two internal constructors on AveragePixelLuminance and SignalBars have been removed, with no new additions.

Minor cleanup — explicit debugDescription properties have been removed from five result types (InstrumentActivityResult, LoudnessResult, PaceResult, RhythmResult, StructureResult), leaving their debug representation to synthesized behavior.

A new NIBodyIdentifiable protocol and NISession.originBody property (iOS 27) enable associating a session with a physical body identity, gated behind the APPLE_FEATURE_NIBODY feature flag.

• NIDLTDOAMeasurementFloorElevation dropped its NSSecureCoding conformance.

TCP metadata gains a setMaxPacingRate(_:) method for controlling send pacing, while two internal actor handler typealiases were removed.

New MediaDuration.continuous case added to represent unbounded/continuous media duration.

PaperDocumentDisplayMode enum (with continuousScroll and twoUp cases) has been removed, along with the default initializer for PaperMarkupViewController.ScrollConfiguration.

PKPassLibrary.sign(_:using:completion:) is deprecated in iOS 26 / watchOS 26 with no replacement offered.

• Three properties on PKAddCarKeyPassConfiguration (vehicleIdentifier, ownerPairingToken, region) were removed before their iOS 26.4 availability shipped.
• The PKTTRComponentIDCarKeys constant was removed from PKConstants.h.

A new PHCollectionListSubtypeRootFolder enum value (available on all platforms at OS version 27) identifies the root folder of the photo library collection hierarchy.

Two new error cases (incompatibleRequest and networkError) added to CustomerEngagementSession.Error.

CADisplayLink.displayLinkWithTarget:selector: is now explicitly marked API_UNAVAILABLE(macos).

Gaussian Splat rendering support has been added via GaussianSplatResource and GaussianSplatComponent, enabling 3D Gaussian Splat scenes to be placed and monitored as RealityKit entities.

• The Portal API has been redesigned: PortalFactory, ClippingPrimitiveComponent, and the old PortalComponent.Plane radius-based setup are removed and replaced with a new PortalComponent-based API using BoundaryStyle, BoundaryMode, and SurfaceStyle.
• BloomSettingsComponent and CustomMaterial.PostLightingShader have been removed with no direct replacements visible in this diff.

ScreenCaptureKit is expanding to iOS, tvOS, and visionOS, with most existing error codes, stream configuration properties, and content style values gaining availability on those platforms for the first time.

• SCStream.cameraEnabled is now restricted to iOS only (removed from macOS/macCatalyst), and SCStreamErrorMissingBackgroundMode is similarly restricted to iOS/visionOS/tvOS only (removed from macOS).
• SCStreamConfiguration.width/height availability corrected back to macOS 12.3 (from 13.0).

New invalidProductConfigID error case added to CredentialSession.ErrorCode.

New hasPendingAccessRequests property added to SWCollaborationView, though it is unavailable on iOS, macOS, and visionOS (so practically inaccessible on all current platforms).

Two internal transcode-management classes (AnimatedStickerTranscodeSlotPool and TranscodeSessionPair) have been removed from the public API.

Single new method DefaultHistoryUpdate.containsAttribute(_:) added for querying whether a history update involves a specific attribute.

New Document protocol and related APIs formalize document-based app configuration, including a new DocumentGroup initializer with an allowCreating parameter and modifiers for customizing the document launch screen title and subtitle.

• BorderedTextFieldStyle is newly available as a concrete struct with a TextFieldStyle.bordered static accessor.

New TextInputBorderShape type lets views control the border shape of text input fields (automatic, capsule, or rounded rectangle) via a new .textInputBorderShape(_:) modifier and matching environment value.

• GeometryProxy gains a concentricCornerRadii property and concentricCornerRadii(in:) method for computing corner radii that are visually concentric with an outer container.

UITextChecker gains async grammar-checking support via two new methods (requestGrammarCheckingOfString:… and ignoreGrammarRange:inSentence:), and a new UIPhotoSearchSuggestion input-suggestion type is added for photo search queries.

• NSTextAlignmentToCTTextAlignment and its inverse are now explicitly marked API_UNAVAILABLE(macos), removing the previously implied macOS availability.
• The NSTextSelectionNavigation delegate gains convertInteractionPoint:toContainerAtLocation: for coordinate conversion between interaction points and text containers.

StageKitPlugin and UsdStage have been removed, replaced by a new USDStage-based API with a full suite of USD math value types (vectors, matrices, quaternions) and a generic USDArray collection type.

• USDPrim gains hasAPISchema, isSchema, makeRelationship, resetTransform, and a typed subscript, giving prims richer schema-introspection and authoring capabilities.
• The new USDValue math types (Vec2–4, Matrix2–4, Quat in f/d/h/i variants) bridge to simd and support simd, projectiveTransform, and matrix interop properties.

WKContentWorldConfiguration gains nodeSerializationEnabled and jsHandleCreationEnabled properties with broader platform availability (previously iOS-only; restrictions removed).

New NWParameters subclass with a wifiAware factory method enables creating network parameters configured for Wi-Fi Aware connections.