App Intents Mastery

App Intents is no longer optional. At WWDC 2026, SiriKit was formally deprecated App Intents became the only path forward.

Apple Intelligence routes through it. Siri AI routes through it. Spotlight semantic search routes through it. Visual Intelligence, the Action Button, the Lock Screen, interactive snippets, the View Annotations API, Model Context Protocol integration every system surface that lets users discover and invoke your app's capabilities now runs on App Intents. Apps that treat the framework as Shortcuts plumbing are about to find themselves invisible to the AI assistant billions of users will receive when iOS 27 ships.

App Intents Mastery is a working developer's guide to building production-grade integrations that survive the migration runway and stay current with the framework's accelerating expansion. Written for Swift developers who have shipped real apps and now need to make their actions reachable to Siri AI, Apple Intelligence orchestration, and the agentic surfaces Apple keeps adding.

What you'll learn:


The architectural discipline that turns App Intents into a platform-grade adoption rather than a Siri-integration polish item
How to design intents that compose well perform() patterns, return types, supportedModes, idempotency strategies, typed error taxonomies
The full assistant schema catalog organized by integration tier, and how to choose between schema adoption and custom intents for each capability
How App Entities feed Spotlight's semantic index for free Siri AI reach through IndexedEntity, the @Property indexing system, @DeferredProperty, and the four entity query protocols
The conversational resolution patterns that make voice invocations actually work custom resolvers, parameter dependencies, validation as re-prompting, proportionate confirmation
Interactive Snippets iOS 26's marquee App Intents feature end to end, including the three-protocol dance and the strict programming model that distinguishes snippet code from regular SwiftUI
Localization across the sixteen Apple Intelligence-supported languages, including the EU iPhone restrictions and China unavailability most documentation skips
AppIntentsTesting, the WWDC 2026 framework that replaces UI automation with cross-process integration testing through real system pathways
The Model Context Protocol story, agentic invocation safety, indirect prompt injection defenses, and the patterns that survive the next system surface Apple ships
How to migrate from SiriKit to App Intents on the two-to-three-year runway without accumulating technical debt


This is not a beginner's book. It assumes you can read Swift, understand SwiftUI bindings, and have shipped real iOS or macOS apps before. It will not teach you the basics of declaring an AppIntent. It will teach you the architectural depth that separates apps participating in Apple Intelligence at scale from apps getting crowded out by the ones that do.

This is also not a documentation rewrite. Apple's reference material is good. This book is organized around the questions Apple's documentation does not answer which patterns survive at production scale, which schemas to adopt in which order, how to test through real infrastructure, how to localize against Siri AI's actual language coverage, and how to design intents safe for agentic invocation.

Twelve chapters. Five reference appendices including a SiriKit migration cheatsheet, a code-pattern quick reference, and a domain-by-domain schema catalog. Built on the post-WWDC 2026 state of App Intents: View Annotations, AppIntentsTesting, RelevantEntities, per-intent privacy manifests, and the SiriKit deprecation that started the migration clock.

For working Swift developers who need to ship App Intents at the depth Apple now rewards, this is the book that gets you there.