HIG Agent Skills

Apple HIG for Agents

Description

HIG Agent Skills brings Apple's design guidance into the coding agent working on your app. The September update adds /duo: choose one part of an existing iOS app, review how it should work on the folding iPhone Duo, decide which changes to make, then build them in the app's own SwiftUI or UIKit code. The command checks the result in the iPhone Duo simulator when available. The skill also gives agents 157 source-reviewed references across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. It retrieves the guidance relevant to the task, including exact measurements, component behavior, platform differences, and accessibility rules, instead of loading the whole library for every question.

More context

The /duo workflow assesses an app's current screens, matches them to Apple's iPhone Duo guidance with sources, recommends options for the person building the app to choose from, and verifies the native changes where a simulator is available. It keeps short notes so the work can continue later.

All 157 references were reviewed against Apple's September 12, 2026 guidance. The rewrite reduced 261,621 words of source material to 90,027 words while preserving the values, conditions, and strength of each recommendation.

An optional enforce mode uses two independent reviewers to score an interface, repair supported findings, and review it again. The project is independent and is not affiliated with or endorsed by Apple.

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JW
Justin Wetch