seam-craft

An agent skill by heygen-com, from heygen-com/hyperframes. Tags: automation, debugging, design, developer-tools, video.

What it does

Render-correctness doctrine for scene-to-scene seams in HyperFrames launch videos — the prerequisites that make transitions composite correctly on the master timeline. Load when assembling the master timeline / index.html, when a white flash appears at a cut or crossfade seam (especially on dark films), when reasoning about why a transition opacity dip shows through, or when verifying the render-side mechanics of how overlapping scene wrappers blend. Covers the opaque stage-ground (#root background) white-flash guard and how the injector overlaps wrappers, holds final frames, ping-pongs tracks, and stamps lint-clean template code onto the master timeline. Does NOT contain the per-transition catalog — see the transition registry for individual transition entries.

Install

With the skills CLI, which installs into Claude Code, Codex, Cursor and other agents:

npx skills add heygen-com/hyperframes --skill seam-craft

Or copy the skill folder into Claude Code's skills directory by hand (~/.claude/skills for every project, or .claude/skills inside one):

git clone --depth 1 https://github.com/heygen-com/hyperframes
cp -r hyperframes/.agents/skills/seam-craft ~/.claude/skills/seam-craft

Safety box score

Grade A, minimal risk: 4 of 100 risk points, rated 2026-10-16. The grade rates what the skill and its scripts can reach on the machine of whoever installs it, across eight categories from shell execution to secrets access. How the score works.

This is a documentation-only skill for scene-seam rendering in generated launch videos. It does not ship executable code or network behavior, but it does prescribe how the assembler should mutate the generated `index.html` and timeline so overlaps composite correctly and dark seams do not flash white.

Category levels, from 0 (none) to 3 (high)
Category	Level	Why
Code & shell execution	0 (none)	No scripts, shell commands, or code execution are shipped in `SKILL.md`; it only describes render behavior.
Network access	0 (none)	There is no download, upload, or remote host interaction in the skill text.
Filesystem reach	1 (low)	It discusses generated output like `index.html` and the stage rule `#root { background: var(--canvas-deep, var(--canvas, #000)) }`, but nothing outside the working tree.
Secrets & credentials	0 (none)	The skill does not reference tokens, keys, passwords, `.env` files, or browser/CLI sessions.
Privilege & persistence	0 (none)	No sudo, global install, services, shell startup edits, or OS setting changes are mentioned.
Instruction hijack surface	0 (none)	There is no instruction to ignore safeguards, follow fetched content, or hide anything; the text is descriptive rather than adversarial.
Irreversible actions	0 (none)	It describes render composition mechanics only; it does not send messages, deploy, post, pay, or delete.
Transparency	0 (none)	The provided skill file is plain markdown with no binaries, base64 blobs, or runtime-decoded code.

Before installing

Read the code that assembles `index.html` and confirm it always sets an opaque `#root` background.
Check the injector/runtime path that retimes `data-duration`, `data-start`, and `data-track-index` before relying on seam correctness.
If you use a separate generator, verify it follows the same white-flash guard and overlap rules as described here.

Rated 2026-10-16 by an automated review of 1 file from the skill's repository.

Source

Repository: heygen-com/hyperframes (all skills from this repository)
Path: .agents/skills/seam-craft/SKILL.md
Branch: main
Updated: 2026-09-19

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