HyperFrames Keyframes

Keyframes are a pose contract: visible states, continuous subject identity, seek-safe runtime, verified pixels.

Use

hyperframes-animation

for broad scene recipes. Use

hyperframes-cli

for full command docs. Use

references/keyframe-patterns.md

only when choosing implementation mechanisms, not visual style.

Procedure

Identify the animated subject, visible states, final state, and runtime.
Choose the smallest mechanism that proves the prompt. Read
```
references/keyframe-patterns.md
```
only if the mechanism is unclear.
Author seek-safe keyframes in the declared runtime. Build synchronously and register the runtime instance.
Verify with lint, validate,
```
hyperframes keyframes
```
, one focused
```
--shot
```
, and snapshots at proof times.
If proof fails, fix the source keyframes and rerun the smallest failing diagnostic before rendering.

Contract

Name the moving subject.
Name the poses needed to prove the intended motion, including the final state.
Keyframe visible channels, not hidden helper state.
Preserve object identity when continuity matters.
Crossfade only when the intended motion is replacement or dissolve.
Hold readable or semantic states long enough to see.
Final frame is part of the animation, not cleanup.
Do not reset to rest unless requested.
Do not end on black unless requested.
If editing a starter scene, preserve layout, copy, assets, colors, and final state unless asked to redesign.

Runtime Rules

GSAP:

build synchronously at page load
use
```
gsap.timeline({ paused: true })
```
register as
```
window.__timelines[compositionId]
```
registry key must match
```
data-composition-id
```
do not call
```
tl.play()
```
for render-critical motion
keep repeats finite

CSS keyframes:

finite duration and iteration count
deterministic delay
```
animation-fill-mode: both
```
use
```
data-start
```
when timing belongs to a clip

Anime.js:

create synchronously
```
autoplay: false
```
finite duration and loops
push every instance to
```
window.__hfAnime
```

WAAPI:

finite
```
duration
```
```
fill: "both"
```
deterministic construction
the text surface does not list WAAPI; verify with
```
--shot
```
(it seeks WAAPI) and snapshots

Never use for render-critical motion:

```
Date.now()
```
```
performance.now()
```
unseeded
```
Math.random()
```
hover/scroll triggers
timers
async-created timelines
unregistered
```
requestAnimationFrame
```
infinite loops

GSAP Skeleton

const root = document.querySelector("[data-composition-id]");
const compositionId = root.dataset.compositionId;
const tl = gsap.timeline({ paused: true });

tl.addLabel("state-a", 0);
tl.to(".subject", {
  keyframes: [
    { x: 0, opacity: 1, duration: 0.2 },
    { x: 120, opacity: 1, duration: 0.4, ease: "power2.out" },
    { x: 100, opacity: 1, duration: 0.2, ease: "power2.inOut" },
  ],
  ease: "none",
});

window.__timelines = window.__timelines || {};
window.__timelines[compositionId] = tl;

Use labels for semantic states. Use position parameters instead of chained delays. Use

immediateRender: false

for later

from()

fromTo()

tweens touching the same property.

Keyframe Forms

Array keyframes: pose ladder with per-step duration/ease.
Percentage keyframes: exact timing inside one tween.
Property arrays: compact multi-stop changes.
```
ease: "none"
```
on the parent when each stop carries its own easing.
```
easeEach
```
when every segment should share the same feel.

Do not copy numeric distances or timing from examples. Derive them from the actual composition geometry and duration.

For one subject moving between two boxes, prefer one continuous transform tween or FLIP. Split

x/y/scale

into multiple eased keyframes only when the viewer should feel distinct beats; every segment changes velocity and can read as a hitch.

Channels

Prefer compositor/visual channels:

x/y/z

xPercent/yPercent

scale

rotationX/Y/Z

skew

transformOrigin

svgOrigin

opacity

autoAlpha

clip-path

, masks, CSS vars, SVG path/dash values, camera transforms, shader uniforms.

Avoid layout/lifecycle channels:

top/left/right/bottom

width/height

margin/padding

display

visibility

, late DOM creation, helper overlays doing subject motion.

Mechanism Choice

Choose the smallest mechanism that proves the prompt:

Need	Mechanism
Same subject changes box or hierarchy	shared element / FLIP
Subject travels a visible route	path travel
Stroke grows or traces	stroke draw
Shape becomes another shape	shape interpolation
Reveal boundary is visible	clip, mask, or shader uniform
Many items move with order	stagger / indexed delay
Text itself moves	line, word, character, or band subdivision
Surface bends, stretches, or crops	parent/child counter-transform
UI has states	explicit state machine
Scene has depth	DOM 3D, Three.js, or WebGL camera/object keyframes

Mechanisms can combine, but each one must clarify the idea. Decoration is not proof.

Timing

Anticipation only when it clarifies cause or direction.
Acceleration leaves rest.
Peak proof shows the mechanism unmistakably.
Follow-through sells energy and direction.
Overshoot only when the subject should feel elastic or tactile.
Constant-speed path travel usually needs
```
ease: "none"
```
.
Discrete UI states usually need a sharp ease-out.
Repeated elements need ordered offsets, not identical timing.
Final lockups need longer holds than transition poses.
Smoothness means continuous velocity on the same subject.
Do not overlap tweens that write the same transform property unless the overlap is intentional and verified.
Avoid animating large
```
clip-path
```
/mask changes while the same hero surface is also scaling or traveling; use nested reveals after the main move settles.

Text

Preserve line boxes, word spacing, readability, and final fit. If text moves internally, move the glyphs or masked bands, not only decorations around the text. Snapshot readable frames.

SVG

For stroke growth prefer

DrawSVGPlugin

, then

stroke-dasharray

stroke-dashoffset

. For shape interpolation prefer

MorphSVGPlugin

; convert primitives to paths when needed and split complex silhouettes into simpler parts.

3D

Scale alone is fake depth. Use perspective on a stable parent,

transform-style: preserve-3d

, z travel, rotation, camera/world motion, occlusion, and layer order when objects cross.

Use one or two diagnostic angles that expose the depth relationship. If angled proof shows no depth crossing, improve z/camera/occlusion.

Canvas / WebGL

Keyframe camera position, camera target, object transform, material opacity, shader uniforms, and postprocess intensity through deterministic state. Render from HyperFrames time. Use

--ghost

because marker boxes cannot see internal canvas motion.

CLI Proof

bash

npx hyperframes lint
npx hyperframes validate
npx hyperframes keyframes .
npx hyperframes keyframes . --json
npx hyperframes keyframes . --runtime all
npx hyperframes keyframes . --selector "<selector>" --shot "<file>" --samples <n>
npx hyperframes keyframes . --selector "<selector>" --shot "<file>" --layout strip --from <t0> --to <t1>
npx hyperframes keyframes . --shot "<file>" --ghost --angle <angle>
npx hyperframes snapshot . --at <times>

Choose

<selector>

for the real animated subject. Choose

<times>

for first frame, proof poses, final-minus-hold, and exact final. Choose

<angle>

only when depth must be proven.

Tool	Proves
`keyframes`	targets, explicit stops, paths, traces, composed parent/child motion, CSS stops, Anime registration
`--shot`	ghosts, route shape, time spacing, DOM 3D projection, focused selector proof
`--layout strip`	in-place motion, overlaps, contact, subtle scale/opacity, text waves
`--ghost`	canvas, WebGL, shader motion, rendered 3D
`snapshot --at`	masks, text readability, full state, final lockup, black/reset tails

If selector proof looks wrong:

rerun
```
--json
```
find the actual animated target
shoot that target
snapshot full frames
trust painted pixels over logs

Diagnostic Reading

flat

means no explicit middle poses.

keyframes

means explicit stops exist.

motionPath

means a route exists.

trace

means multi-stroke drawing.

composed with

means child motion inherits parent motion.

Even ghost spacing means constant speed. Clustered ghosts mean slow-in or settle. Large gaps mean fast travel.

A helper-selector shot is not proof. An onion shot over a broken full frame is not proof.

Error Handling

Failure	Fix
endpoint-only	add middle poses, hold peak proof, rerun `--shot`
identity break	keep one element alive, use shared source/final boxes, remove substitute crossfade
fake 3D	add z/camera travel, occlusion, angled proof
wrong final	add final hold, snapshot final-minus-hold and exact final
unseekable runtime	pause autoplay, register instance, remove timers, build synchronously
unreadable text	preserve line boxes, reduce displacement, add final hold, snapshot text frames

Done

Run lint, validate, keyframes, one focused

--shot

, and snapshots. Confirm first frame, proof poses, final-minus-hold, exact final, subject-owned motion, and no debug overlays.

hyperframes-keyframes

NPX Install

Tags

SKILL.md Content