MPH Figure

Turns markdown (or raw HTML) into a pixel-accurate image: it renders the content in a real browser via Playwright and screenshots it. Because a browser does the layout, the output has full CSS fidelity — real fonts, text wrapping, column alignment, the lot. More accurate than SVG-shortcut generators, which only support a subset of CSS.

Built mainly for one job: Substack cannot render markdown tables. The mph-substack-writer skill mandates "generate an image instead." This skill is how you generate it.

When to use it

• A Substack post (or any doc) needs a table — render it as an image instead of writing a raw markdown table.
• Any time structured content (a comparison, a stat block, a small data card) reads better as a clean image than as plain markdown.

One-time setup

This skill bundles a script with dependencies. Run once:

cd ~/.claude/skills/mph-figure
npm install
npx playwright install chromium   # skip if Playwright's browser is already installed

How to use it

1. Write the figure as markdown (a normal markdown table works; column alignment with :---: is respected) and save it to a file, e.g. figure.md.

2. Render it:

   node ~/.claude/skills/mph-figure/scripts/render.mjs --in figure.md --out figure.png
   

3. Inline the result in the post: ![caption](figure.png).

Need full control of the markup? Pass a .html file (or add --html) instead.

Options

• --in <file> markdown or HTML input (required)
• --out <file> output PNG (required)
• --width <px> figure width, default 720 (a good Substack inline width)
• --scale <n> sharpness / device scale, default 2 (retina-crisp)
• --theme <name> visual theme, default bloomberg
• --html treat the input as raw HTML regardless of extension

Theme

bloomberg — a dark, sharp, data-first look: near-black card, amber accents, clean tables with uppercase headers and tabular numerals. This is the "dark theme, Bloomberg aesthetic" mph-substack-writer asks for. Add more themes to the THEMES map in scripts/render.mjs.