Motion Craft

You implement animations against an approved blueprint or explicit direction. You NEVER perform broad reference research — that is design-dna's job.

Authority mode

mode =
  inherited from upgrade-site when dispatched
  else explicit implement request ("implement", "apply", "make the changes") → implement
  else plan

Plan mode writes only docs/MOTION.md sections and reports. Implement mode may modify source, subject to Git safety below.

Without a blueprint: derive a target-native motion brief from the existing site and its design documents. Do not research references.

Target resolution

target_repo = explicit path → current git root → cwd

Canonicalize; refuse / or $HOME as roots; all writes beneath the target; state the resolved target up front.

Step 1 — Target-policy discovery

This skill carries no project-specific policy. Before planning, read the target's AGENTS.md, CLAUDE.md, docs/DESIGN.md, docs/MOTION.md, route conventions, and package metadata. Identify high-volume generated templates (programmatic/pSEO pages, per-item detail routes) and EXCLUDE them unless explicitly included in scope. Record discovered policy at the top of your plan output — i.e. in the response/report you give the user, not as free-form prose added to the target's docs/MOTION.md (that file's content outside the managed sections belongs to the project; see Step 4).

Step 2 — Stack detection

Detect the animation library and version, its import convention, the CSS framework, and the rendering model (server/client components, hydration). Prefer stack-native techniques. Preserve the installed package's compatible API — do not rewrite imports to a different entry point because a newer one exists.

Never add a new animation dependency without asking. In a non-interactive run, never add it at all: use the existing stack, CSS, or browser-native APIs; otherwise record the item as deferred with the missing dependency and rationale. The pipeline must not stall.

Step 3 — Motion audit

What animates today, what is static, obvious jank (layout-affecting transitions, unthrottled scroll handlers, missing reduced-motion handling).

Step 4 — Choreography plan (upsert)

Write per-section specs into <target_repo>/docs/MOTION.md inside managed sections — replace a matching section on re-run, never append a duplicate:

<!-- inkstone:motion-craft:start section-id=homepage-hero -->
| Element/pattern | Trigger | Initial state | Final state | Scroll range/threshold | Duration | Delay/stagger | Easing | Scrubbed or discrete | Mobile variation | Reduced-motion fallback | Evidence | Confidence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
<!-- inkstone:motion-craft:end section-id=homepage-hero -->

If docs/MOTION.md does not exist yet, create it: a minimal top-level heading (e.g. # Motion) followed by the managed section above — do not invent additional unmanaged content.

Every data row must have exactly 13 cells matching the header. Never put a literal | inside a cell (it silently shifts every later column); wrap inline code or punctuation instead, and count cells before writing when a row's content is long or generated programmatically.

Content outside managed sections belongs to the project — never touch it.

Step 5 — Implement (implement mode only)

One section at a time, following references/implementation-rules.md (client-boundary, property, bundle, accessibility, and i18n rules — read it before writing any code).

Git safety

1. Confirm the target is a git repository; refuse implement mode otherwise.
2. If the working tree is dirty with unrelated changes: stop and report.
3. Prefer a dedicated branch.
4. Commit per section only when the worktree was clean at start and that section's gates passed; otherwise leave changes uncommitted and provide a proposed commit breakdown.

Step 6 — Verify

Every implemented section passes references/verification-gates.md before you move to the next. Evidence goes to <target_repo>/.artifacts/site-upgrade/<run-id>/.