Motion Lexicon

Motion Lexicon is a design system for product motion. It connects two equal collections: Motion Primitives describe a precise behavior; Components turn one or more behaviors into a complete, copy-ready product interaction. Page composition places those interactions inside a coherent product surface.

Design from the user's product event. Produce code only when it supports a clear state change, a focused actor, and an accessible handoff.

Choose a mode

Apply mode priority deterministically: a complete page or multi-region surface uses Build Page; an explicit request for code or a framework implementation of one interaction uses Implement; a request only for a design plan, beat plan, or Blueprint uses Compose. Implement may create a Blueprint internally and still delivers the runnable format the user requested. A Review request can return a revised Blueprint when the current interaction needs a larger change.

Start every request

1. Preserve the user's language. Use Chinese for Chinese requests and English for English requests. 2. Identify the product job, primary action, user-visible state before and after it, primary actor, and intended feeling. 3. Use the mode × reference table below. Load only the files selected for the current task. 4. Load [interior-principles.md](references/interior-principles.md) when the request needs material depth, physicality, or the Interior visual profile. 5. State assumptions briefly when the request leaves product context open. Ask one focused question only when a missing constraint changes the design. 6. Keep one primary visual actor and at most two supporting actors in a beat. Give each actor a semantic kind: trigger, hero, status, record, or environment. Give each beat a product purpose: orient, confirm, preserve continuity, reveal, or recover. 7. Include a reduced-motion plan and keyboard/focus behavior in every composed, implemented, or reviewed interaction. 8. For a page request, inspect the host project before choosing a stack. Preserve its routing, component system, design tokens, and content language. Use React and TypeScript for a greenfield page unless the user requests another stack.

Mode × reference routing

Motion language

Use the Interior-informed profile throughout the skill:

• Model a real product state with a bezel, a raised panel, and a recessed well

when material depth helps orientation.

• Start motion from an event: a press, selection, route change, status update,

or direct manipulation.

• Reserve space for state changes so labels, buttons, and records keep their

geometry.

• Use arrival motion for new context: cubic-bezier(.23, 1, .32, 1) over

roughly 200–280 ms. Use leaving motion for removed context: cubic-bezier(.23, 1, .32, 1) over roughly 110–180 ms.

• Use transform and opacity for the moving work. Use short color or focus

transitions when feedback needs an immediate response.

• Let a second user action interrupt, reverse, or settle the first action.
• In reduced motion, preserve state, hierarchy, focus, and feedback through a

static state or short opacity crossfade.

Read the detailed rules in [interior-principles.md](references/interior-principles.md).

Build Page

Build a complete, runnable product surface in the user's project. Read [page-composition.md](references/page-composition.md), [page-system.md](references/page-system.md), and [components.md](references/components.md) before planning the page.

1. Inspect the target repository, framework, routes, existing tokens, and installed dependencies. Reuse the host system where it is coherent. 2. Before editing any file, output the Host inspection table and compact Page Plan shown below. Include the page job and archetype, every major region, the exact published component ID or none, the primary state boundary, and the responsive and theme decisions. Every Host inspection value cites the inspected file path. A prose implementation intention does not satisfy this gate. 3. Use the source at https://motion-lexicon.pages.dev/r/<id>.json for a published component. Read its files, dependencies, and runtime before editing. Install the delivered source and dependencies; adapt only its props, labels, data, callbacks, and host placement. Do not regenerate an approximation of the same component. 4. Complete the Registry integration gate before selecting an ID: every current Registry source uses Tailwind utility classes. Confirm that the host already compiles Tailwind, or add its supported Tailwind setup when changing the host toolchain is within scope. If that setup cannot be added, select none for the region and build plain semantic UI; never silently paste a CSS reimplementation of a Registry component. Record the JSON URL, target file, dependency list, and any required runtime in the Page Plan. 5. Audit the rendered interactive node after integration. The page standard is at least 44 by 44 CSS px even when a Registry component's default visual height is smaller. Pass a host class through a documented className prop and set min-width and min-height on that node. If the source offers no safe styling hook, choose a fitting component that does or leave the region plain. 6. Give the page one dominant work surface, one primary motion moment, and at most two supporting motion moments. Keep static content calm. 7. Use the host design system. For a greenfield surface, copy and adapt [motion-lexicon-page.css](assets/motion-lexicon-page.css), then apply the exact hierarchy and responsive rules from [page-system.md](references/page-system.md). 8. Deliver the whole route or page, including realistic content, loading, empty, success, failure, and recovery states that belong to its job. 9. Verify 320, 390, 768, and 1440 px layouts; light and dark themes; keyboard order and focus; reduced motion; 44 px interactive targets; overflow; and console or hydration errors. Build success alone does not satisfy page acceptance. Start the local app or production preview and use available browser automation to exercise the primary action and inspect rendered geometry at every required viewport. A missing project browser-test script is not a blocker: use an available browser tool against the local preview. At each viewport, enumerate every visible button, link, input, select, textarea, and custom interactive node; record the minimum rendered width and height plus an offenders list for nodes below 44 px in either dimension. Fix every offender and rerun all four viewport audits before reporting acceptance. Report the commands, interactions, measurements, and observable results.

Keep the Page Plan concise:

## Host inspection

| Concern | Observed host evidence |
| --- | --- |
| Framework | name/version — `package.json` |
| Route | current route and target file — `src/router.tsx` |
| Component system | reused components or none — `src/components/...` |
| Tokens / theme | token and theme mechanism — `src/styles.css` |
| Tailwind | installed/compiled or absent — `package.json`, `vite.config.ts` |
| Dependencies | reused packages and versions — `package.json` |

## Page Plan

Job: …
Archetype: …
Primary action: …
Primary state: idle → pending → success/error

| Region | Product purpose | Published component | State or motion |
| --- | --- | --- | --- |
| … | … | `component-id` or `none` | … |

Registry:
- `component-id` — https://motion-lexicon.pages.dev/r/component-id.json —
  `target/file.tsx` — dependencies: `package` / none

Responsive: 320/390 …; 768 …; 1440 …
Theme: light …; dark …; reduced motion …

Do not begin implementation until every line in this plan is concrete.

The final handoff must remain independently auditable after intermediate messages are collapsed. Repeat the complete Host inspection table and Page Plan, including the region table and Registry lines, then add an Acceptance table with one observed row for each item below:

| Check | Observed evidence |
| --- | --- |
| Build | command and exit result |
| 320 | viewport/document width, minimum target width/height, offender count |
| 390 | viewport/document width, minimum target width/height, offender count |
| 768 | viewport/document width, minimum target width/height, offender count |
| 1440 | viewport/document width, minimum target width/height, offender count |
| Light / dark | how each theme was activated and inspected |
| Keyboard / focus | exact key path, focus entry, and focus return |
| Reduced motion | emulated preference and observed static or crossfade result |
| Targets | measured minimum width and height of visible interactive nodes |
| Primary state | exercised pending, success, error/retry, and interruption states that apply |
| Runtime | console, page, request, and hydration error counts |

Name the installed component IDs and changed files. Use Incomplete for an unobserved row and state the missing capability. Do not describe an unobserved check as supported or passing.

When the user requests the Motion Lexicon look, preserve the visual profile and interaction quality while adapting content and information architecture to the actual product. Avoid filling a page with library demos.

Recommend

Return a compact decision that the user can apply immediately.

1. Map the request to up to three published candidates from [components.md](references/components.md), or from the one relevant primitive reference selected above. Start every candidate cell with its exact published component or primitive ID in backticks, followed by a human label when useful. A descriptive label alone is incomplete. Never present an unknown or invented ID as published. 2. Explain the visual difference in product terms: spatial continuity, weight, pacing, attention, or status confidence. 3. Choose one candidate, repeat its exact published ID in the Pick line, and state the default timing, easing, trigger, and reduced-motion treatment. 4. Offer a Motion Blueprint when the request describes several states.

Use this format:

## 建议 / Recommendation

| 候选 / Candidate | 适合场景 / Fit | 区别 / Difference |
| --- | --- | --- |
| `published-id` / … | … | … |

**推荐 / Pick:** `published-id` / …

- 触发 / Trigger: …
- 节奏 / Timing: …
- 无障碍 / Accessibility: …

Compose

Create a Motion Blueprint before expanding into implementation details. Use [assets/motion-blueprint.schema.json](assets/motion-blueprint.schema.json) as the contract. Every Compose response includes one schema-valid fenced JSON object; do not substitute a prose table or text diagram for the Blueprint. Keep string values compact in chat, then write the same JSON to a file when the user asks for a reusable artifact.

Every beats[].primitive and every provenance.foundations[] value must be an exact published primitive ID copied from the selected references. Human labels and unpublished pseudo IDs do not satisfy the Blueprint contract.

Before replying, write the final JSON to a temporary file and run:

node "$CODEX_HOME/skills/motion-lexicon/scripts/validate-motion-blueprint.mjs" /tmp/blueprint.json

Fix every validation failure and rerun until the command exits 0. Copy the fenced JSON byte-for-byte from that validated file and report the command and exit code. An unvalidated or rewritten-after-validation Blueprint is incomplete.

The Blueprint includes:

• intent: product goal, user intent, and desired feeling.
• stateGraph: named before, in-flight, success, failure, and recovery states

that matter for the scene.

• actors: one primary actor, supporting actors, and a semantic kind for each

actor.

• beats: timed changes with a purpose, primitive, properties, duration, and

easing.

• accessibility: reduced motion, focus, ARIA status, keyboard, and pointer

plans.

• delivery: requested formats and integration notes.
• provenance: referenced primitives, moments, confidence, and candidate

status.

After the Blueprint, describe the beat sequence in plain language. Give each beat a clear start condition and final resting state.

Implement

Read [implementation-css.md](references/implementation-css.md) before writing code. Default to semantic HTML, CSS custom properties, and small event-driven JavaScript. Adapt to React, Vue, Svelte, or another framework when requested. Route a request containing several page regions through Build Page.

An explicit implementation request requires runnable code in the requested framework or format. A Blueprint, pseudo-code sample, or prose plan alone is incomplete. When the request provides a writable project or fixture, install the implementation in that project, run its compile or build command to exit 0, and report the command and result.

Implementation requirements:

• Keep markup semantic and stateful with data-state, aria-live, and native

controls where they fit.

• Animate transform and opacity; reserve layout dimensions before a state

enters or leaves.

• Use timing values from the Blueprint. Keep a typical arrival within 200–280

ms unless the product event communicates real duration.

• Make interruption explicit. A repeat press, Escape, undo, or route change

should settle into a coherent state.

• Include a prefers-reduced-motion branch that preserves information and

interaction.

• Deliver only the formats the user requested. A complete portable handoff uses

HTML, CSS, and JS sections plus a short integration note.

For a single primitive, give one canonical implementation and a concise parameter table. For a Product Moment, give the complete state machine and code for every meaningful state.

Review

Read [review-rubric.md](references/review-rubric.md). Diagnose the observed behavior before proposing a rewrite.

Review in this order:

1. State clarity: can a user identify what changed and why? 2. Continuity: does the primary actor keep its spatial or semantic identity? 3. Timing: do arrival, feedback, and leaving rhythms fit the event? 4. Performance: do animated properties stay compositor-friendly and stable? 5. Interruption: do rapid repeat actions, failure, undo, and navigation settle coherently? 6. Accessibility: do reduced motion, focus, keyboard, and status messages preserve meaning?

Return findings as critical, important, and polish, each with observed effect, likely cause, and a focused fix. Include a revised beat plan when it improves several findings at once.

For an async race, require a monotonic request or intent version. Only the response matching the current intent may commit visible state; discard stale responses, cancel or settle their obsolete animations, and announce only the current state through ARIA status.

Contribute

Read [contribution.md](references/contribution.md) and use [assets/candidate-template.md](assets/candidate-template.md). Gather a real product scene, evidence for the user need, a complete Blueprint, and portable implementation notes.

Classify the proposal:

• Preset: a controlled timing, copy, or visual variation of a published

pattern.

• Moment candidate: a complete product scene built from existing

primitives.

• Primitive candidate: a reusable behavior demonstrated across three

independent product scenes.

Create the candidate record with status: candidate. Keep public publication for maintainer approval. Include test states, reduced-motion behavior, and the three-scene proof for a primitive candidate. Replace every explicit template placeholder, set locale and level for the request, complete the Blueprint, and validate it to exit 0 before sharing the candidate. Record each quality check with its command, artifact, and observed result. Install the portable implementation in the provided fixture or host project and run its real build to exit 0; prose, pseudo-code, or an unbuilt snippet leaves the candidate incomplete.

Output quality

• Favor a concrete product scene over generic decorative motion.
• Keep explanations concise. Put detail into the Blueprint, code, or review

table when it directly helps implementation.

• Preserve the user's component structure and product language when reviewing

existing work.

• Keep labels and headings self-explanatory. Add supporting copy only when it

prevents ambiguity or error.

• Use published Registry source for an exact component and cite its ID in the

handoff.

• In Recommend, put an exact published ID in every candidate row and repeat the

chosen ID in the Pick line.

• Use direct, precise language. Describe behavior in terms a designer and an

engineer can both implement.

• Validate JSON Blueprints with:

  node "$CODEX_HOME/skills/motion-lexicon/scripts/validate-motion-blueprint.mjs" path/to/blueprint.json