Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/heygen-com/hyperframes/seam-craftnpx skills add heygen-com/hyperframes --skill seam-craftgit clone --depth 1 https://github.com/heygen-com/hyperframesWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00144 | $0.01066 |
| Opus 5 | $0.00072 | $0.00533 |
| Sonnet 5 | $0.00029 | $0.00213 |
| Haiku 4.5 | $0.00014 | $0.00107 |
Grade A, and why
seam-craft scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Seam Craft — render prerequisites for scene-to-scene transitions
This is the render-correctness doctrine for PLV scene-to-scene seams: the prerequisites and master-timeline mechanics that make any transition composite correctly, independent of which specific transition is chosen. The per-transition catalog (crossfade, push-slide, zoom-through, cut-the-curve, …) lives in the transition registry — this page is the doctrine that sits underneath all of them.
The transitions this doctrine governs are Tier-B-ready: pure transform / opacity /
filter on the two scene clip wrappers (#el-<sid>), no injected overlay DOM, no
per-scene cooperation. Overlay families (staggered blocks, blinds, light leak, grid
dissolve, page burn) and shader transitions are deferred to later phases.
Stage ground prerequisite (white-flash guard)
Several templates open a window where the two wrappers' summed opacity < 1 (the
cut-the-curve mid-window cut, zoom-through's 0.15 floor, plain crossfade's
power-curve dip). Whatever is BEHIND the wrappers shows through during that
window. If the assembled index.html #root has no opaque background, the
renderer composites the dip over its default white page → a white flash at
every seam, glaring on dark films (observed on two Spotify runs before the fix).
The assembler must paint the stage: #root { background: var(--canvas-deep, var(--canvas, #000)) } — assemble-index.mjs now emits this;
any other consumer of these templates owns the same guarantee.
How the injector applies a transition
At a break boundary between scene i (from) and scene i+1 (to), the
injector:
- Extends
#el-<from>wrapperdata-durationbyduration_s(holds its final frame — verified:core/src/runtime/init.ts:1393-1410external-slot branch). - Pulls
#el-<to>wrapperdata-startearlier byduration_s(creates the overlap window). - Reassigns all clip
data-track-indexas a 0/1 ping-pong so the two overlapping wrappers never share a track (same-track overlap is illegal —core/src/lint/rules/composition.ts). Higher track composites on top. - Stamps the
gsap_templateintowindow.__timelines["main"]atT = overlap-start.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 69 lines · 144 tokens per session scan A e86400c1fba3
seam-craft is a skill published in the GitHub repository heygen-com/hyperframes (43,593 stars, last pushed today), licensed Apache-2.0. It adds 144 tokens to every session and 1,066 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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