design-engineering

This skill is a graph, not a file. The body below is the Map of Content. Follow the [[wikilinks]] only as needed — that's the whole point of progressive disclosure.

How to use this skill

1. Route first: [[routing-table]] maps intent → entry node for most single questions. If two intents blur, [[disambiguation]] names the tiebreaker. Multi-cluster jobs follow [[stacking-chains]].
2. Otherwise scan the MOCs below, pick the cluster, and open its MOC-*.md for the atomic nodes under it.
3. Read only the atomic nodes that match. Each node is standalone — you don't need siblings.
4. Before reviewing UI code, also load [[gotchas]] and [[pov]].

If the user asks for a UI code review, use the format defined in [[review-format]] and scan against [[review-checklist]].

Philosophy — when, where, and why polish matters

How to think about taste, delight, and the difference between marketing and product UI.

• [[MOC-philosophy]] → [[taste-is-trained]], [[unseen-details-compound]], [[beauty-is-leverage]], [[delight-impact-curve]], [[feeling-right]], [[marketing-vs-product-ui]], [[states-are-the-work]], [[data-is-content]], [[dependency-discipline]], [[pointing-beats-describing]], [[articulate-precisely]]

Motion — when something should move, and how

The largest cluster. Animation is the most overused tool in modern UI; this cluster tells you when not to animate as much as when to.

• [[MOC-motion]] → [[animation-decision-framework]], [[easing-curves]], [[duration-table]], [[spring-animations]], [[transform-opacity-only]], [[transform-mastery]], [[clip-path-tricks]], [[never-scale-from-zero]], [[gesture-momentum]], [[stagger-choreography]], [[prefers-reduced-motion]], [[fly-not-teleport]], [[responsive-feedback]], [[sonner-principles]], [[debugging-animations]], [[lerp-breathing]], [[morphing-icons]], [[shared-letter-morph]], [[hover-default-imperative]], [[tray-rules]], [[css-conventions]]

Transition techniques — Jakub Antalik's catalog

A subset of motion focused on canonical transitions for common UI archetypes. Where the Motion MOC teaches principles, these nodes teach implementation. From transitions.dev.

• [[cross-blur-transitions]] — Pair opacity 0↔1 with filter: blur(2px) ↔ 0 to mask imperfect crossfades.
• [[compose-subtract-asymmetry]] — Enter with more properties than exit. Disappearance feels soft, not reversed.
• [[distance-falloff-propagation]] — Per-element lift via lift * pow(falloff, distance) for grouped hover.
• [[multi-segment-shake]] — Form-error shake at 0%, 28.57%, 57.14%, 78.57%, 100% over 280ms.

Typography — humanizing text

The font defaults of the AI era are tells. Better choices and the rules around them.

• [[MOC-typography]] → [[typography-humanity]], [[line-length-tracking]]

Surface — color, shadow, radius, dark mode, imperfection

The "background" choices that most decks of guidelines skip. They're load-bearing for feel.

• [[MOC-surface]] → [[color-monochromatic]], [[dark-mode]], [[shadows-whisper]], [[border-radius]], [[visual-imperfection]], [[contrast-and-color-scheme]]

Layout — page-level grids, viewports, sticky chrome, URL-as-state

The container, not the component. Marketing especially benefits from custom-per-viewport thinking; product apps benefit from URL-driven state.

• [[MOC-layout]] → [[viewport-custom-design]], [[sticky-and-scroll-tells]], [[url-as-state]]

Components — buttons, hovers, states, cards, forms, avatars, icons, a11y, copy

The atoms users actually touch. Their behavior is where craft lives.

• [[MOC-components]] → [[hover-states-subtle]], [[empty-loading-states]], [[icon-systems]], [[cards-design]], [[forms-validation]], [[avatar-systems]], [[interaction-personality]], [[accessibility-baseline]], [[optimistic-updates]], [[copy-voice]]

Anti-patterns — what AI-generated UI gives away

What looks "AI default" and what to do instead. High-value because it's about deletion, not addition.

• [[MOC-anti-patterns]] → [[ai-default-tells]], [[content-authenticity]]

Meta — review format, design.md, Agentation, evals, per-installer files

Procedural rules and growing files. [[review-format]] is mandatory when doing UI code reviews.

• [[routing-table]] — Intent → entry-node router with the four postures (build / judge / decide / name). Open this before anything else on a single question.
• [[disambiguation]] — The questions that blur together (four motion questions, three dark-mode owners, two layout-shift owners) and which node owns each.
• [[stacking-chains]] — Ordered node chains for multi-step jobs (new screen, feel-better pass, design system, marketing site, a11y pass).
• [[review-format]] — Required output format for UI critiques (Before | After | Why markdown table).
• [[review-checklist]] — Eleven-row audit to scan against before signing off on a UI review.
• [[design-vocabulary]] — The precise word for each design phenomenon and where the skill goes deeper. The lexicon behind [[articulate-precisely]]; seeded by Index (Emil Kowalski & Glenn Carstens-Peters).
• [[using-design-file]] — How to consume a project's .design contract (schema design.v1). Machine-readable tokens, committed intent, executable policy — and it outranks this skill's defaults.
• [[using-design-md]] — How to consume a project's DESIGN.md (Google Labs spec). Tokens are normative; prose is context.
• [[agentation-workflow]] — Install and use Agentation for click-to-annotate design review. Two-session critique-then-fix workflow.
• [[cross-model-testing]] — How to test description / routing changes across GPT, Claude Opus, and Claude Sonnet.
• [[gotchas]] — lived failures, appended as the agent trips up.
• [[pov]] — author/installer's opinions and taste calls that override defaults. Edit this when you fork.
• [[animations-dev-curriculum]] — external pointer to Emil's course; don't duplicate.

Workflow subagents — sibling agents/ directory

Six narrow-purpose subagents live in agents/ next to this file. Spawn one when its specific workflow matches the user's ask. Each subagent loads its own slice of the graph and returns to the main agent with a structured result.

• [[ui-reviewer]] — Runs the [[review-format]] table + [[review-checklist]] audit on a UI snippet.
• [[motion-auditor]] — Animation/transition critique against the motion cluster + transitions.dev nodes.
• [[anti-pattern-scanner]] — Scans for AI-default tells and content-authenticity misses.
• [[agentation-fix-loop]] — Session-2 fix side of [[agentation-workflow]]. Reads MCP annotations and applies fixes.
• [[design-md-consumer]] — Reads a project's DESIGN.md and threads its tokens through generated UI per [[using-design-md]].
• [[pov-curator]] — Helps the installer fork [[pov]] and append to [[gotchas]] after a real failure.

See agents/README.md for the full directory and selection guide.

Identity — SOUL.md

The repo also ships a SOUL.md at root — voice, stance, and taste lineage for any agent operating in this skill. AGENTS.md is the "what/how"; SOUL.md is the "who/why". Read it once per session if your harness doesn't auto-inject it.

Tax check

Every sentence above costs tokens in every session. If you find yourself adding a sentence, ask: would the agent get this wrong without it? If no, delete it. If yes, it belongs in an atomic node, not here.

— HKTITAN, 2026.