---
id: CharlesWiltgen/Axiom/axiom-health
version: "3d11b3e6"
license: MIT
install: manual
updated: 2026-07-27
---

# axiom-health — axiom-health equips you with expert guidance on HealthKit and WorkoutKit development across iOS, iPadOS, and watchOS. Navigate authorization flows, execute efficient data queries, implement background delivery for change tracking, build live workout sessions, and integrate wellbeing APIs—all grounded in Apple's latest frameworks and concurrency patterns.

Publisher: CharlesWiltgen · Stars: 1095 · Updated: 2026-07-27

Install (manual): `git clone https://github.com/CharlesWiltgen/Axiom`

## SKILL.md

# HealthKit and WorkoutKit

**You MUST use this skill for ANY HealthKit or WorkoutKit development including authorization, data queries, background delivery, workout sessions, planned workouts, wellbeing APIs (State of Mind), Medications, and Health Records.**

## Quick Reference

| Symptom / Task | Reference |
|----------------|-----------|
| HealthKit framework model, `HKHealthStore`, data types, sample vs characteristic data | See `skills/fundamentals.md` |
| Capability setup, `requestAuthorization`, purpose strings, read-asymmetry, privacy | See `skills/authorization-and-privacy.md` |
| `HKSampleQuery`, Swift Concurrency query APIs, `HKStatisticsCollectionQuery`, sample writes | See `skills/queries.md` |
| Anchored queries, observer queries, `HKDeletedObject`, `background-delivery` entitlement | See `skills/sync-and-background.md` |
| `HKWorkoutSession`, `HKLiveWorkoutBuilder`, recovery, multi-device, iOS/iPadOS/watchOS workout tracking | See `skills/workouts.md` |
| Workout zones (heart-rate/power effort bands), live + retrospective `OS27` | See `skills/workouts.md` |
| WorkoutKit custom/planned workouts, scheduling, swimming workouts, previewing | See `skills/workoutkit.md` |
| State of Mind, Medications API, symptom logging, menopausal state, wellbeing APIs `OS27` | See `skills/wellbeing-and-medications.md` |
| Health Records (FHIR), Mobility Health App, motion-based health | See `skills/clinical-and-mobility.md` |

## Cross-Suite Routes

These topics overlap with HealthKit/WorkoutKit but live in separate suites:

#### 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

**axiom-health vs axiom-watchos**: For workout apps on Apple Watch:
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

**axiom-health vs axiom-concurrency**: For HealthKit query patterns:
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

**axiom-health vs axiom-data**: For change-tracked data synchronization:
1. **Use axiom-health** for `HKAnchoredObjectQuery`, `HKObserverQuery`, `HKDeletedObject`
2. **Use axiom-data** for application-level data sync across devices (CloudKit, GRDB, SwiftData)

## Decision Tree

```dot
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

**WWDC**: 2019-218, 2020-10182, 2020-10184, 2020-10664, 2021-10009, 2021-10287, 2022-10005, 2023-10016, 2023-10023, 2024-10084, 2024-10109, 2025-321, 2025-322

**Docs**: /healthkit, /healthkit/about-the-healthkit-framework, /healthkit/authorizing-access-to-health-data, /healthkit/protecting-user-privacy, /healthkit/reading-data-from-healthkit, /healthkit/running-queries-with-swift-concurrency, /healthkit/executing-anchored-object-queries, /healthkit/executing-observer-queries, /healthkit/hkworkoutsession, /healthkit/hklivewobuilder, /workoutkit, /healthkit/accessing-health-records

**Skills**: axiom-watchos, axiom-concurrency, axiom-swiftui, axiom-data, axiom-security


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