Use when a HyperFrames composition needs a punch-in, punch-out, zoom, reframe, Ken Burns treatment, camera move, visual match/whip handoff, or other seek-safe 2D/3D keyframes; also for GSAP, CSS keyframes, Anime.js, WAAPI, FLIP, paths, masks, SVG morph/draw, text trails, 3D depth, or `hyperframes keyframes` diagnostics. Don't use for broad scene strategy, brand design, media sourcing, captions, or general video planning.
Use when a HyperFrames composition needs a punch-in, punch-out, zoom, reframe, Ken Burns treatment, camera move, visual match/whip handoff, or other seek-safe 2D/3D keyframes; also for GSAP, CSS keyframes, Anime.js, WAAPI, FLIP, paths, masks, SVG morph/draw, text trails, 3D depth, or `hyperframes keyframes` diagnostics. Don't use for broad scene strategy, brand design, media sourcing, captions, or general video planning.
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.
Creator editing boundary
Keyframes own visual motion, not clip assembly. Source-range hard cuts, trim,
splice, and reorder belong to /hyperframes-core: author one media element per
kept range, place it with and , and select its source
offset with . Adjacent ranges make a hard cut. A crossfade
uses overlapping clips on different tracks plus visual opacity keyframes; sound
fades use .
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Install
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Keyframe scale with x/y or percentage translation on a non-timed visual/crop wrapper inside the clip. Use a set/short tween for a hard punch and a tween for a smooth move.
Smooth multi-state zoom or reframe
Keep one subject wrapper alive and author multiple zoom/reframe states as a pose ladder with per-segment easing.
Pan, reframe, or Ken Burns camera move
Animate wrapper translation plus scale. Geometry is authored; this is not face tracking or automatic semantic reframing.
Chained camera moves
Chain labeled transform beats on one registered seek-safe timeline.
Match cut or whip pan
/hyperframes-animation owns the visual handoff; /hyperframes-registry supplies primitives; keyframes preserve authored geometry, direction, and velocity. There is no automatic matching-frame discovery.
Crop and mask reframe
Interpolate clip-path or a mask on an inner visual wrapper to crop/reframe without changing source time. Polygon keyframes can form a polygon/mask transition.
Directional wipe cut or iris/reveal cut
Animate a mask/clip boundary across overlapping visual clips; /hyperframes-animation owns the handoff choreography.
Split-screen handoff
Keep both visual clips placed by core, then keyframe their inner crop/mask wrappers and divider geometry.
Constant source retime
/hyperframes-core owns normalized data-playback-rate (0.1..5) for render-safe picture and pitch-preserved sound. It is constant for the whole media element.
Source speed ramps
Not supported: there is no time-varying playback-rate envelope. Preprocess a derived media asset, then place it through core.
Freeze / hold
A visual pose, final source frame, or finished sub-composition can hold. Arbitrary mid-source freeze is not supported; preprocess a still/derived segment, place it as its own clip, then resume with another source range.
When editing picture and sound together, load /hyperframes-core, this skill for
visual motion, and /hyperframes-audio for fades, crossfades, volume automation,
ducking/carve, or effects on the placed tracks.
A visual transition or cropping treatment is not a temporal source trim or
splice. /hyperframes-core owns the timeline, clip timing, and source ranges;
keyframes only animate the visible handoff or crop on wrappers inside those clips.
For copyable combined picture/sound recipes, use /hyperframes-core → references/creator-editing-recipes.md.
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 hyperframes lint, hyperframes check, 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
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.
Avoid layout/lifecycle channels: top/left/right/bottom, width/height, margin/padding, display, visibility, late DOM creation, helper overlays doing subject motion.
For visibility changes, use autoAlpha on the registered seekable GSAP timeline, or a zero-duration tl.set() at an explicit boundary. Target only a non-clip element or a wrapper inside the clip; never target .clip itself. Never duration-tween raw visibility, and never tween display.
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.
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.
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
preserve line boxes, reduce displacement, add final hold, snapshot text frames
Done
Run hyperframes lint, hyperframes check, hyperframes keyframes, one focused --shot, and snapshots. Confirm first frame, proof poses, final-minus-hold, exact final, subject-owned motion, and no debug overlays.
