Tame Apple's Focus Engine with a Swift Agent Skill

Where this fits

During a tvOS polish pass, your app's focus jumps to an off-screen card when the user presses up. Or a watchOS screen captures the Digital Crown and makes scrolling feel stuck. You need an agent that understands Apple's focus engine instead of making blind SwiftUI edits. This skill gives the agent a platform-specific review checklist plus reference files for SwiftUI, UIKit, AppKit, and RealityKit focus APIs.

Why agents benefit

• Detects anti-patterns from a curated reference list instead of pattern-matching across recent SwiftUI changes.
• Loads the correct rule set by platform: tvOS focus and UIKit, iOS focus groups and halo, watchOS Digital Crown, visionOS, and macOS key view loops.
• Reviews focusable(), focused(), FocusState, preferredFocusEnvironments, and related APIs with modern usage in mind.
• Distinguishes genuine focus bugs from stylistic preferences, so the agent avoids noisy refactors.
• Produces fixes that respect Apple's focus engine rules, including hover, accessibility, and RealityKit input.

Practical scenarios

tvOS card grid focus jumps

preferredFocusEnvironments conflicts cause the engine to select a child view that is off-screen. The agent reviews the focus tree, finds the missing focusable() guard, and rewrites the environment list to be deterministic.

watchOS Digital Crown over-scroll

A List or scrolling view on watchOS makes crown rotation skip items. The skill loads the watchOS focus reference and fixes sequential focus ordering, plus updates accessibility labels.

visionOS hover and RealityKit focus

A visionOS app uses hoverEffect and RealityKit gestures, but focus moves inconsistently when the user looks at entities. The agent aligns FocusState with onHover handlers and checks RealityKit input handling against Apple's platform rules.

Add it to your agent workflow

Install the skill with:

npx skills add mhaviv/Swift-FocusEngine-Agent-Skill --skill swift-focusengine-pro

Then ask the agent to use it in context:

Load swift-focusengine-pro. Review the focus management in this tvOS detail view. Find any focus loop anti-patterns and propose a fix using modern SwiftUI APIs.

The skill's versioned reference files let the agent give an answer grounded in platform-specific rules rather than generic Swift knowledge.

Compare before adopting

Before adopting, compare a few signals:

• Quality signals: Does the skill catch real focus bugs in your codebase? Does it avoid nitpicking?
• Maintenance freshness: Version 1.7.2 and an active GitHub repo mean the references are more likely to stay current with new OS releases.
• Alternatives: Apple documentation, a generic Swift coding skill, or your own prompt-specific focus rules can work, but they lack the curated platform checks this skill provides.
• Workflow fit: The npx install and single-skill invocation should slot into existing agent loops without extra configuration.

Why it is worth tracking

With 20 stars and frequent version bumps, swift-focusengine-pro is a practical niche tool for Apple platform agents. It is worth evaluating when focus management errors appear in more than one project, especially if you support tvOS or watchOS alongside iOS. For a live overview of releases and platform coverage, see its OpenAgentSkill listing: https://www.openagentskill.com/skills/mhaviv-swift-focusengine-pro