axiom-design

name	axiom-design
description	Use when making design decisions, implementing HIG patterns, Liquid Glass, SF Symbols, typography, or structuring app entry points and authentication flows.
license	MIT

Design & HIG

You MUST use this skill for ANY visual design, HIG compliance, Liquid Glass, SF Symbols, typography, or app composition work.

Not on Claude Code? Where this router says "Launch some-auditor agent", read that auditor's file in this suite and follow it inline — the same procedure, needing only file search and read.

Available here: skills/liquid-glass-auditor.md.

Agents that need Bash — builds, tests, simulators, crash symbolication — stay Claude Code-only; there is no inline equivalent for those.

Quick Reference

Symptom / Task	Reference
Design decisions, HIG compliance, colors, backgrounds	See skills/hig.md
Spacing, padding, margins, insets — what value to use	See skills/hig.md
Section index / A–Z index strip / alphabet scrubber — should this list have one	See skills/hig.md
Semantic colors, custom color patterns, material styles	See skills/hig-ref.md
Liquid Glass effects, adoption, migration from blur effects	See skills/liquid-glass.md
App-wide Liquid Glass adoption, backward compatibility	See skills/liquid-glass-ref.md
SF Symbols rendering modes, effects, animations	See skills/sf-symbols.md
SF Symbols API signatures, UIKit equivalents, availability	See skills/sf-symbols-ref.md
Verify a symbol name exists / check one symbol's availability or supported modes (sfsymbols CLI)	See skills/sf-symbols-ref.md (Part 11)
San Francisco fonts, text styles, Dynamic Type, tracking	See skills/typography-ref.md
App entry points, auth flows, root view switching, scene lifecycle, document-based apps	See skills/app-composition.md
Apple Pay button / Wallet pass design / Tap to Pay button	See axiom-payments suite, plus skills/hig.md for cross-cutting HIG context

Decision Tree

digraph design {
    start [label="Design task" shape=ellipse];
    what [label="What do you need?" shape=diamond];

    start -> what;
    what -> "skills/hig.md" [label="design decision,\nHIG compliance,\ncolor/background choice"];
    what -> "skills/hig.md" [label="spacing/padding/margin value"];
    what -> "skills/hig-ref.md" [label="semantic color API,\ncustom color code,\nmaterial style details"];
    what -> "skills/liquid-glass.md" [label="Liquid Glass effects,\nmigrate from blur,\nRegular vs Clear"];
    what -> "skills/liquid-glass-ref.md" [label="app-wide Liquid Glass plan,\nplatform differences,\nbackward compat"];
    what -> "skills/sf-symbols.md" [label="rendering mode choice,\nsymbol effects/animations,\ncustom symbols"];
    what -> "skills/sf-symbols-ref.md" [label="SF Symbols API syntax,\nUIKit equivalents,\navailability matrix"];
    what -> "skills/typography-ref.md" [label="font selection,\nDynamic Type,\ntext styles, tracking"];
    what -> "skills/app-composition.md" [label="@main entry point,\nauth flow, root view,\nscene lifecycle"];
}

1. Design decision / HIG compliance / choosing colors or backgrounds? → skills/hig.md 1a. Need semantic color API, custom color code, or material style details? → skills/hig-ref.md
2. Liquid Glass effects / migrating from blur / Regular vs Clear variant? → skills/liquid-glass.md 2a. Planning app-wide Liquid Glass adoption / platform differences / backward compatibility? → skills/liquid-glass-ref.md
3. SF Symbols rendering mode / symbol effects / custom symbols? → skills/sf-symbols.md 3a. Need SF Symbols API syntax / UIKit equivalents / availability check? → skills/sf-symbols-ref.md
4. Font selection / Dynamic Type / text styles / tracking / leading? → skills/typography-ref.md
5. App entry point / auth flow / root view switching / scene lifecycle? → skills/app-composition.md
6. SwiftUI view implementation? → /skill axiom-swiftui
7. TextKit / rich text editing / Writing Tools? → /skill axiom-uikit
8. Accessibility compliance (VoiceOver, contrast, touch targets)? → /skill axiom-accessibility
9. Audit UI for Liquid Glass adoption? → liquid-glass-auditor (Agent — surfaces migration opportunities AND adoption-completeness gaps: variant discipline, nesting hygiene, availability gating, primary-action tinting, accessibility re-check; scores ADOPTED / PARTIAL / NOT ADOPTED)
10. CarPlay app design, categories, driver-distraction rules? → /skill axiom-media (carplay-hig.md)

Platform-specific HIG

• watchOS design (glanceable UI, watchOS 10 navigation) → See axiom-watchos (skills/design-for-watchos.md)

Conflict Resolution

design vs swiftui: When building UI:

1. Use design FIRST — Decide what to build (colors, materials, typography, layout intent) before how to build it.
2. Then use swiftui — Implement the design decision in SwiftUI code.

design vs accessibility: When choosing colors or typography:

• Color contrast or Dynamic Type compliance? → use accessibility
• Which semantic color or text style to pick? → use design

design (liquid-glass) vs swiftui: When implementing Liquid Glass:

• What Liquid Glass is, when to use Regular vs Clear, migration strategy → use design (skills/liquid-glass.md)
• SwiftUI code for .glassEffect() modifier → use design (skills/liquid-glass-ref.md), then swiftui for surrounding view code

design (app-composition) vs swiftui: When structuring app architecture:

• @main entry, auth state machine, root view switching, scene lifecycle → use design (skills/app-composition.md)
• NavigationStack, NavigationSplitView, tab structure → use swiftui

design vs media (CarPlay): When designing for CarPlay:

• General iOS HIG principles (colors, typography, Liquid Glass) → use design
• CarPlay-specific rules (app categories, entitlement review, template-only UI, driver distraction, per-category design rules) → invoke axiom-media (skills/carplay-hig.md)
• CarPlay rules are stricter than iOS HIG and enforced at entitlement review, not just App Store review.

Critical Patterns

HIG Quick Decisions (skills/hig.md):

• Background color decision tree (media-focused vs standard)
• Typography selection (headline vs body vs caption)
• Color usage guidelines and when to use semantic vs custom colors
• Design review checklist for HIG compliance

HIG Comprehensive Reference (skills/hig-ref.md):

• All semantic colors with platform availability
• Custom color patterns with dark mode support
• Background hierarchy and material styles
• Code examples for every color and background pattern

Liquid Glass (skills/liquid-glass.md):

• What Liquid Glass is and how it differs from blur effects
• Regular vs Clear variant selection
• Migration strategy from pre-iOS 26 materials
• Tinting, legibility, and adaptive behavior troubleshooting
• Expert review criteria for Liquid Glass implementations

Liquid Glass Adoption (skills/liquid-glass-ref.md):

• App-wide adoption planning (icons, controls, navigation, menus)
• Platform-specific behavior (iOS, iPadOS, macOS, tvOS, watchOS)
• Backward compatibility strategy for supporting pre-Liquid Glass
• Accessibility compliance with Liquid Glass interfaces

SF Symbols (skills/sf-symbols.md):

• Rendering mode selection (Monochrome, Hierarchical, Palette, Multicolor)
• Symbol effect selection (Bounce, Pulse, Scale, Wiggle, Rotate, Breathe, Draw)
• Custom symbol creation workflow
• Troubleshooting effects not playing, weight mismatches

SF Symbols API (skills/sf-symbols-ref.md):

• Exact API signatures for rendering modes and effects
• UIKit/AppKit equivalents for every SwiftUI symbol API
• Platform availability matrix
• Configuration options (weight, scale, variable values)

Typography (skills/typography-ref.md):

• San Francisco font system (Pro, Compact, Mono, New York)
• Text styles with Dynamic Type scaling
• Tracking and leading values
• Internationalization considerations

App Composition (skills/app-composition.md):

• @main entry point and root view patterns
• Authentication state machine (login, onboarding, main)
• Flicker-free root view switching
• scenePhase lifecycle handling and state restoration
• Document-based apps: the OS27 @Observable document model (ReadableDocument/WritableDocument) + DocumentGroup

Anti-Rationalization

Thought	Reality
"I'll just pick colors that look good"	Semantic colors adapt to dark mode, accessibility settings, and platform automatically. Custom colors need all of that manually. skills/hig.md has the decision tree.
"Liquid Glass is just a blur effect"	Liquid Glass is a distinct material system with lensing, tinting, and adaptive behavior. Using .blur() instead creates a visually wrong result. skills/liquid-glass.md explains the difference.
"I know which SF Symbol rendering mode to use"	The right mode depends on context (monochrome for toolbars, hierarchical for depth, palette for brand colors). skills/sf-symbols.md has the decision tree.
"I'll hardcode font sizes"	Hardcoded sizes break Dynamic Type, violate HIG, and fail accessibility review. skills/typography-ref.md shows the text style system.
"I'll handle auth state with a boolean"	A boolean can't represent login, onboarding, and main states without race conditions. skills/app-composition.md has the state machine pattern.
"Liquid Glass adoption means rewriting my whole UI"	Most standard SwiftUI/UIKit components adopt automatically. Start by building with latest Xcode, then review. skills/liquid-glass-ref.md has the incremental strategy.
"I'll add the SF Symbol animation later"	Symbol effects are the primary way users perceive interactive feedback. Shipping without them feels broken. skills/sf-symbols.md covers selection.
"I'll skip the design review, the code works"	HIG compliance affects App Store review. Reviewers reject apps that feel wrong even if they function correctly. skills/hig.md has the review checklist.

Example Invocations

User: "Should I use a dark or light background?" -> Read: skills/hig.md

User: "What semantic color should I use for secondary text?" -> Read: skills/hig-ref.md

User: "How do I implement Liquid Glass in my app?" -> Read: skills/liquid-glass.md

User: "I need to plan Liquid Glass adoption across my whole app" -> Read: skills/liquid-glass-ref.md

User: "My SF Symbol is flat, I want it to have depth" -> Read: skills/sf-symbols.md

User: "What's the SwiftUI API for symbol effects?" -> Read: skills/sf-symbols-ref.md

User: "Which font should I use for body text?" -> Read: skills/typography-ref.md

User: "How do I switch between login and main screens?" -> Read: skills/app-composition.md

User: "Check my app's UI for HIG compliance" -> Read: skills/hig.md, then /skill axiom-accessibility for contrast/Dynamic Type

User: "I want my download button icon to animate" -> Read: skills/sf-symbols.md