Pack layout

Skill shuakami/paperchart/skills/pack-layout

Quiet, editorial chart PNGs for technical blog posts. 15 primitives, six themes, one CLI.

Install

npx -y skills add shuakami/paperchart --skill pack-layout

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

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What its author says it does

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Render a three-panel byte-layout diagram for a binary file format. Panel one shows the proportional byte share of each section, panel two shows a bit-level header breakdown with labelled bits, and panel three shows a full left-to-right entry layout. Use when a technical blog post needs to explain how a custom binary format is packed on disk or in memory.

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SKILL.md

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paperchart — pack layout

A one-page explanation of a binary format. Three stacked panels:

Proportional section bar. Horizontal strip, each section sized by its share of the total. The accented section is the one the reader should think about.
Bit-level header breakdown. Eight boxes, one per bit. Type bits get the accent; length bits stay neutral. Each group has a caption naming it and a sub-caption explaining the encoding.
Entry layout, left to right. The anatomy of a single record in the format, with a bold name and a monospace sub-line for each field.

When to use

Documenting a custom wire format.
Explaining a varint / tag / length encoding.
Showing how a packed index, page, or block is laid out in storage.

Visual rules

Proportional section bar has the accented section filled with #C75F3C, others with #D6B99B. Inside the accent, the foreground text flips to the page background (#F6F1EA) for contrast.
Bit boxes use a fixed 110 px square with 12 px gaps; the letters are 48 px / 600 for legibility.
The full entry strip uses the same two colours; the first field (header byte) is always accented because it drives everything after it.

How to use

Edit src/charts/PackLayout.tsx.
Replace SEGMENTS with your sections; replace the eight-bit array in the header panel; replace the five-field entry strip at the bottom.
npm run dev, open /#/pack-layout.
npm run snap to render to out/pack-layout.png.