design-engineering: interface motion, sound and launch-video guidance

# 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 0. `/design-engineering` is a router before it is a library: `[[skill-router]]` resolves the design contract, classifies the phase (undecided → build → refine → check → name), and hands the job to one owner — a node here, a subagent, or an installed companion skill (AgentsORG `design`, impeccable, HyperFrames, ElevenLabs, transitions-dev, the shadcn CLI, diagram-design, tldraw, GSAP, better-icons). One or two owners, never five. 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]], [[performance-discipline]], [[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. ## Sound — when an interface should be heard, and how The sense the web forgot. Product UI is silent by default; a launch video is the reverse. This cluster decides which, designs one material family, syncs it to motion, and generates the files — ElevenLabs on demand, or open-weight / procedural / CC0 without a key. - `[[MOC-sound]]` → [[sound-decision-framework]], [[sound-motion-sync]], [[sound-palette]], [[sound-spec]], [[sound-playback-web]], [[sound-generation-elevenlabs]], [[sound-generation-open-source]], [[launch-video-sound]], [[launch-video-music]], [[sound-from-motion]] ## Launch video — planning, cutting, scoring and reviewing a launch film A rendered film is its own surface: name the register, time the beats, set the words and the UI demo, make the seams and cuts, place the sound, review against the register. HyperFrames builds; this cluster decides the register, beats, words and sound, and [[hyperframes-reconciliation]] settles seams inside a HyperFrames project. - `[[MOC-launch-video]]` → [[launch-video-registers]], [[launch-video-structure]], [[launch-video-type]], [[launch-video-ui-demo]], [[launch-video-motion]], [[launch-video-seams]], [[launch-video-cuts]], [[launch-video-review]], [[hyperframes-reconciliation]] ## SVG — creating, animating, morphing, and vectorizing The only image format that is also an interface. Author it on the token system, move it with the engine its home allows, morph it by the command-count rule, and turn flat clips into editable mascots. - `[[MOC-svg]]` → [[svg-creation]], [[svg-animation]], [[svg-path-morphing]], [[video-to-vector-pipeline]] ## Diagrams — figures, canvases, and whether to draw at all A diagram is the costliest way to say something. Decide whether a picture earns its place and who touches it next. Then draw a finished figure (Cathryn Lavery's diagram-design) or edit a live canvas (tldraw's Desktop skill or MCP app). Map the project's contract onto the figure, and review it by the connector rules. - `[[MOC-diagram]]` → [[diagram-decision]], [[diagram-craft]], [[diagram-design-reconciliation]], [[tldraw-canvas]] ## 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]], [[type-scale-and-rhythm]], [[line-behavior]] ## 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]], [[color-scales-oklch]], [[dark-mode]], [[shadows-whisper]], [[depth-and-nesting]], [[border-radius]], [[visual-imperfection]], [[contrast-and-color-scheme]] ## Layout — page-level grids, viewports, sticky chrome, URL-as-state, marketing surfaces 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]], [[marketing-surface-rules]] ## Components — buttons, hovers, states, cards, forms, avatars, icons, a11y, copy, APIs 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]], [[forms-behavior]], [[touch-and-focus]], [[ui-polish-pass]], [[component-api-design]], [[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]], [[unslop-pass]], [[content-authenticity]], [[copy-tells]], [[code-tells]] ## Meta — review format, design.md, Agentation, evals, per-installer files Procedural rules and growing files. `[[review-format]]` is mandatory when doing UI code reviews. - [[skill-router]] — What `/design-engineering` does first: resolve the contract, classify the phase, hand off to one owner — a node, a subagent, or an installed companion (AgentsORG `design`, impeccable, HyperFrames, ElevenLabs, transitions-dev, shadcn CLI, diagram-design, tldraw, GSAP, better-icons). - [[routing-table]] — Intent → entry-node router with the four postures (build / judge / decide / name). Open this before anything else on a single question. - [[prototype-picker]] — Undecided? Three to five genuinely different versions behind a live picker, numbers on controls, then write the decision and delete the harness. - [[build-a-tool]] — "Closer, but not quite" twice? Stop re-prompting; diagnose the gap and build the small tool that produces the artifact. - [[vibe-to-generator]] — Only a mood, no spec? Research the visual language into rules, then a seeded generator with knobs and a save button. - [[design-system-docs]] — Writing a DESIGN.md or docs folder an agent can follow: inventory the code, when/alternative, closed variant sets, correct/incorrect examples, verify by prompting. - [[skill-writing-rules]] — Encode process, write the why, be strict, earn every line, one aspect per skill, test by running. Governs every node here and [[pov]]. - [[design-benchmarks]] — DesignBench's generation / edit / repair tasks and Design Arena's pairwise votes, and this skill's own eval suite that borrows both. - [[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]] — Thirteen-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](https://www.agentation.com) 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 Ten 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. - [[sound-designer]] — Runs the sound cluster end to end: decide, palette, generate (`scripts/sound-family.mjs` for a product family, `scripts/sound-sheet.mjs` for a video stem derived from the motion), spec, wire up. Returns a sound map. - [[svg-creator]] — Authors or refactors an SVG asset: grid, named groups, token colors, SVGO with the right flags, accessible name. - [[svg-animator]] — Animates an SVG or builds a vector flipbook from frames (`scripts/svg-flipbook.mjs`), engine chosen by where the file lives. - [[launch-film-analyst]] — Measures a reference launch film or your own render at native fps and returns the [[launch-video-review]] rubric plus a per-film JSON. See `agents/README.md` for the full directory and selection guide. ## Identity — SOUL.md The repo also ships a [`SOUL.md`](../../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.