HealthKit and WorkoutKit

Quick Reference

HKHealthStore

skills/fundamentals.md

requestAuthorization

skills/authorization-and-privacy.md

HKSampleQuery

HKStatisticsCollectionQuery

skills/queries.md

HKDeletedObject

background-delivery

skills/sync-and-background.md

HKWorkoutSession

HKLiveWorkoutBuilder

skills/workouts.md

skills/workoutkit.md

skills/wellbeing-and-medications.md

skills/clinical-and-mobility.md

Cross-Suite Routes

watchOS presentation

• Watch-specific workout presentation (Always On, Smart Stack), complication surfaces → See axiom-watchos
• Workout app structure on Apple Watch → See axiom-watchos (

  skills/platform-basics.md

  )

Concurrency

• Swift 6 concurrency, actors, Sendable → See axiom-concurrency
• HealthKit queries bridging to Swift Concurrency →

  skills/queries.md

  is the canonical example

SwiftUI

• Charts rendering for health data → See axiom-swiftui

• @Observable

  view models for health data → See axiom-swiftui

Data and sync

• General cross-platform sync patterns (CloudKit, GRDB) → See axiom-data
• HealthKit anchored/observer queries as a generalizable sync mechanism →

  skills/sync-and-background.md

Security and privacy

• Keychain storage, encryption, data-protection entitlements → See axiom-security

Conflict Resolution

1. Use axiom-health for

   HKWorkoutSession

   lifecycle,

   HKLiveWorkoutBuilder

   , recovery APIs, multi-device mirroring — these are HealthKit concepts, not watch concepts
2. Use axiom-watchos for watch-specific presentation: Always On display, Smart Stack placement, watchOS background mode coordination
3. Both apply for a watch-native workout app — start with axiom-health for session lifecycle, then axiom-watchos for presentation

1. Use axiom-health for which query type to choose and HealthKit-specific gotchas
2. Use axiom-concurrency for general Swift 6 actor isolation rules that apply to query callbacks

1. Use axiom-health for

   HKAnchoredObjectQuery

   ,

   HKObserverQuery

   ,

   HKDeletedObject

2. Use axiom-data for application-level data sync across devices (CloudKit, GRDB, SwiftData)

Decision Tree

digraph health {
    start [label="HealthKit / workout task" shape=ellipse];
    what [label="What area?" shape=diamond];

    start -> what;
    what -> "skills/fundamentals.md" [label="framework basics, data types"];
    what -> "skills/authorization-and-privacy.md" [label="permissions, purpose strings, privacy"];
    what -> "skills/queries.md" [label="reading data, rollups, writes"];
    what -> "skills/sync-and-background.md" [label="change tracking, background delivery"];
    what -> "skills/workouts.md" [label="HKWorkoutSession, live workouts"];
    what -> "skills/workoutkit.md" [label="planned/custom workouts"];
    what -> "skills/wellbeing-and-medications.md" [label="State of Mind, Medications"];
    what -> "skills/clinical-and-mobility.md" [label="Health Records, Mobility"];
    what -> "axiom-watchos" [label="watch-specific presentation"];
    what -> "axiom-concurrency" [label="general actor isolation rules"];
    what -> "axiom-swiftui" [label="Charts, data visualization"];
}

Resources