# axiom-health

Gives an agent focused guidance for HealthKit and WorkoutKit work on iOS and watchOS, from permissions and queries to workout sessions and background delivery.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 953 installs · ★ 1229
- Author: CharlesWiltgen
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/CharlesWiltgen/Axiom/tree/HEAD/axiom-codex/skills/axiom-health/SKILL.md
- Updated: 2026-10-20
- HTML: https://affpapa.org/en/nevibecode/skills/axiom-health

## What it does

This skill routes HealthKit and WorkoutKit tasks to focused references for `HKHealthStore`, authorization, sample and statistics queries, data writes, and change tracking with anchored or observer queries. It also covers `State of Mind`, Medications, Health Records, and mobility health data.

For workout features, it addresses the `HKWorkoutSession` lifecycle, `HKLiveWorkoutBuilder`, recovery, device mirroring, and planned or custom WorkoutKit sessions. Background delivery involves the `background-delivery` entitlement, so check that setup before adding `HKObserverQuery`.

The skill separates HealthKit concerns from Apple Watch presentation, general Swift Concurrency rules, SwiftUI charts, and application-level data sync. That boundary matters when several Axiom skills apply to the same feature.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add CharlesWiltgen/Axiom --skill axiom-health -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/axiom-health/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/axiom-health/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add CharlesWiltgen/Axiom --skill axiom-health -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/axiom-health/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add CharlesWiltgen/Axiom --skill axiom-health -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/axiom-health/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install CharlesWiltgen/Axiom axiom-health
```

2. **Manually: put the files in place**
- File: `.github/skills/axiom-health/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add CharlesWiltgen/Axiom --skill axiom-health -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/CharlesWiltgen/Axiom --path axiom-codex/skills/axiom-health
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/axiom-health/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add CharlesWiltgen/Axiom --skill axiom-health -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/CharlesWiltgen/Axiom/tree/HEAD/axiom-codex/skills/axiom-health/SKILL.md

## When to use it
- request HealthKit read and write authorization
- choose a sample or statistics query
- track changes with anchored and observer queries
- build a workout flow with `HKWorkoutSession`
- schedule a custom WorkoutKit workout

## Example prompts
- Set up HealthKit authorization and purpose strings for reading health data.
- Create an `HKAnchoredObjectQuery` that handles deleted objects.
- Add a watchOS workout session using `HKWorkoutSession` and `HKLiveWorkoutBuilder`.

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 07efa0fe9310fa41.

BEGIN THIRD-PARTY FILE 07efa0fe9310fa41
```text
---
name: axiom-health
description: Use when working with HealthKit, WorkoutKit, health data, workouts, or fitness features on iOS or watchOS. Covers permissions, queries, background delivery, custom workouts, multidevice coordination.
license: MIT
---

# 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
```
END THIRD-PARTY FILE 07efa0fe9310fa41

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First 2925 of 5446 bytes. © CharlesWiltgen · MIT · https://github.com/CharlesWiltgen/Axiom/tree/HEAD/axiom-codex/skills/axiom-health/SKILL.md

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