Diagrams that argue.
Not boxes that label.

Install

Themes

Five themes ship today. Author a new one in 20 lines of JSON + npm publish.

default-sketchy

stripe-press

notion

whiteboard

dark

Browse theme details · Create a custom theme

The methodology

Diagrams are arguments. The shape should BE the meaning.

• Isomorphism test. Would the structure alone communicate the concept?
• Evidence artifacts. Real code, actual API names, concrete formats — not placeholder text.
• One accent per diagram. Two means a competing argument; split it.

Read the theme manifest and agent-facing spec

Why this, not just another Excalidraw MCP?

Excalidraw's official MCP and most community servers solve plumbing: get an agent to emit valid JSON and render it. They produce correct boxes-and-arrows.

This pack solves taste — the isomorphism test, evidence artifacts, multi-zoom architecture, container discipline — deciding what to draw and why, so the output is a visual argument that teaches instead of a labeled grid. Plumbing is a commodity now. Quality isn't.

Proof

This skill drew 77 diagrams for the published technical book From Copilot to Colleague — argument spines, chapter openers, concept figures, and inline explainers. No other Excalidraw generator can point at a corpus like that. A curated set (the argument spine + all ten chapter openers) ships as source in examples/book; the full 77 are live across fromcopilottocolleague.com.

What ships in v0.1