Code Slice Hero Block

What it does

When your agent uses it

• Adding a tile-flip headline reveal to a HyperFrames video
• Rendering a short hero title with front and rear text
• Tuning sweep direction, easing and shadow of a title animation

Example prompts

• “Add the code-slice-hero block and render it with the headline LAUNCH DAY and rear headline SHIPPED.”
• “Make the tile sweep go right to left and slow it down.”
• “Mount the code slice hero in my index.html and show me the variables I can change.”

Requirements

• Node.js with npx to install and render the block

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

1. 1Keep data-composition-variables a single-quoted attribute with plain " JSON. Never save it through Studio's Design panel.
2. 2Do not put in static markup; create it at runtime.
3. 3Keep every visual state a function of t; seek-safety is what makes the block renderable.

What it can do on your machine

Read from SKILL.md and the folder at commit f6b3821. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships script files (JavaScript), which the agent can run.

  Shell commands in SKILL.md call:

  • npx

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Code Slice Hero Block loads about 1.2k tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 441 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~41

When it runs · the whole SKILL.md, loaded when a task matches

~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from heygen-com/hyperframes at commit f6b3821, republished under its Apache-2.0 licence (© heygen-com). 441 words, ~1,190 tokens.

name

code-slice-hero

description

A tiled headline surface flips cell by cell under a sweeping depth field to reveal the rear headline. HyperFrames block, 1920×1080, 8s, 18 variables.

<div
  data-composition-id="code-slice-hero"
  data-composition-src="compositions/code-slice-hero/code-slice-hero.html"
  data-start="0"
  data-duration="8"
  data-track-index="1"
  data-width="1920"
  data-height="1080"
></div>

npx --yes hyperframes@0.8.12 render 'compositions/code-slice-hero/code-slice-hero.html' --variables '{"headline":"MAKE IT","reverseHeadline":"MATTER."}'

© heygen-com, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 8 other files (assets) in registry/blocks/code-slice-hero of heygen-com/hyperframes.

• SKILL.md
• assets/GSAP-NOTICE.txt
• assets/Geist-Bold.ttf
• assets/Geist-OFL.txt
• assets/gsap-3.14.2.min.js
• code-slice-hero.html
• registry-item.json
• shadows.js
• surface.js

Open the folder on GitHubat commit f6b3821

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in heygen-com/hyperframes, which our catalogue first saw on October 7, 2026.

• Unclecheng-li/AI_Animationskills/ui2v-motions/01_动效库/itelmn/code-slice-hero