nyyon-figures

A local MCP server that renders editorial diagrams and featured covers from a spec — for any brand, not just nyyon. No network, no model, nothing leaves the machine — the calling assistant does the thinking, this tool does the drawing.

It ships three things:

• Templates — 16 parametric, content-agnostic diagram shapes + a 1200×630 featured cover, drawn as code (SVG → PNG via resvg at 2×).
• Settings — a brand-themeable paper/ink theme with a single accent. Colors, accent, wordmark and URL are all overridable (file or env); it ships with nyyon's look (#6C5CE7, Inter + JetBrains Mono) as the default.
• Reasoning prompt — how to map an article to a set of figures (which shape per idea, anchored to the sentence it illustrates, varied across the piece) + a cover.

The 16 templates

contrast · layers · cycle · fanout · columns · grid · funnel · timeline · quadrant · pyramid · venn · table · pipeline · radial · bigstat · progression

Each uses the accent as a signal: the FIG. mark, the primary arrowheads, and the single focal "point" of the diagram (the goal node, the source, the winning quadrant, the apex…).

Tools

tool	what it does
figures_for_article	Start here. Article + a design (auto / all / cover / a template name) → a short brief telling you exactly what to produce, then render. Token-lean: a specific design returns only that template's schema.
list_templates	List all templates + the cover with their slot schemas.
get_settings	The active theme — colors, fonts, sizes, brand (reflects runtime changes).
set_theme	Adjust the global look — colors / fonts / brand — for all later renders.
render_figure	{ template, slots } → a diagram PNG. Returns the file path.
render_cover	{ title, kicker?, highlight?, sub?, style? } → the 1200×630 cover PNG.
render_set	A whole article set (figures[] + optional cover) in one call.

Two ways to use it

Article → figures:

1. figures_for_article with the article + design → follow the returned brief to produce the spec.
2. render_set (or render_cover) → PNGs written locally; embed them, use the cover as featured/OG. Show the renders.

Ad-hoc one-off — just call render_figure directly, e.g. "a venn of X and Y overlapping Z" → { template: "venn", slots: { left_label: "X", right_label: "Y", overlap_label: "Z" } }. No article needed.

Re-theme anytime with set_theme (or env / src/settings.js).

Install (Claude / MCP)

npm install

Then add to your MCP client config:

{
  "mcpServers": {
    "nyyon-figures": { "command": "node", "args": ["/ABSOLUTE/PATH/nyyon-figures/src/index.js"] }
  }
}

Or with the CLI: claude mcp add nyyon-figures -- node /ABSOLUTE/PATH/nyyon-figures/src/index.js

Settings & overrides

Edit src/settings.js, or override at runtime via env:

• NYYON_FIGURES_ACCENT — accent hex (default #6C5CE7)
• NYYON_FIGURES_PAPER / NYYON_FIGURES_INK — background / foreground
• NYYON_FIGURES_BRAND_NAME — wordmark text on the cover (default nyyon)
• NYYON_FIGURES_BRAND_URL — URL printed on the cover (default nyyon.com)
• NYYON_FIGURES_BRAND_MARK — SVG path (~64×70 box) for the logo mark; "" = text-only wordmark + plain accent hub
• NYYON_FIGURES_OUT — directory for rendered PNGs (default $TMPDIR/nyyon-figures)

So a different brand is one line: NYYON_FIGURES_BRAND_NAME='Acme' NYYON_FIGURES_BRAND_URL='acme.io' NYYON_FIGURES_BRAND_MARK='' NYYON_FIGURES_ACCENT='#0EA5E9'.

Test

npm test   # renders one of every template + the cover into tmp-smoke/