Apple Engineer Superpowers

Use when writing Swift code for Apple platforms - iOS, macOS, visionOS. Covers Swift 6 concurrency, actors, Sendable, async/await, SwiftUI, MVVM architecture, Metal GPU programming, RealityKit ECS, visionOS scenes, interpolation/animation, advanced collection types, property wrappers, Combine bridging, error handling, testing, and API design patterns.

28 stars 1 forksMobile Development

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add piemonte/apple-engineer-superpowers --skill apple-engineer-superpowers

Manual install

git clone --depth 1 https://github.com/piemonte/apple-engineer-superpowers.git /tmp/apple-engineer-superpowers
mkdir -p ~/.claude/skills
cp -r /tmp/apple-engineer-superpowers/. ~/.claude/skills/apple-engineer-superpowers

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# Apple Platform Engineering

Comprehensive Swift engineering standards for building production-quality Apple platform applications.

## Core Principles

1. **No Force Unwrapping (`!`)** - Use `guard let`, `if let`, nil coalescing (`??`), or optional chaining. Never crash on nil.
2. **Actor-First Concurrency** - Use actors as the default for stateful components. Prefer actor isolation over manual locking.
3. **Async/Await Always** - Never use completion handlers in new code. Use `async throws` functions.
4. **Sendable Everything** - All shared types must conform to `Sendable`. All closures crossing concurrency boundaries must be `@Sendable`.
5. **Swift 6 Strict Concurrency** - Enable `StrictConcurrency` from the start. No data races.
6. **Protocol-Oriented Design** - Define contracts through protocols. Use dependency injection for testability.
7. **LocalizedError for Errors** - Domain-specific error enums conforming to `LocalizedError, Sendable`.

## Quick Reference

### Safe Optional Handling

| Instead of | Use |
|------------|-----|
| `value!` | `guard let value else { return }` |
| `string.data(using: .utf8)!` | `string.data(using: .utf8) ?? Data()` |
| `url!` | `guard let url = URL(string: s) else { return }` |
| `object.property!` | `object.property?.method()` or `if let prop = object.property { }` |

### Concurrency Primitives

| Need | Use |
|------|-----|
| Stateful shared component | `actor` |
| Simple value protection | `Mutex<State>` |

Read the full skill on GitHub

Details

Skill name: apple-engineer-superpowers
Repository: piemonte/apple-engineer-superpowers
License: MIT
Repo updated: 1 March 2026

FAQ

What does the Apple Engineer Superpowers skill do?

How do I install the Apple Engineer Superpowers skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add piemonte/apple-engineer-superpowers --skill apple-engineer-superpowers. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Apple Engineer Superpowers popular?

It lives in piemonte/apple-engineer-superpowers, which has 28 GitHub stars and 1 forks.

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