Draft Canvas
System diagrams whose connectors caption themselves from the shapes they join
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If Mermaid keeps moving your boxes and draw.io is too fiddly to version, this is the middle ground, and agents can write it without spending tokens on coordinates.
Reladraw is a small text language for diagrams. Instead of handing layout to an engine or dragging shapes by hand, you say where things sit relative to each other, such as right of, below or level with, and it renders SVG. It is written in TypeScript with no runtime dependencies, installs from npm, has a browser playground, and ships an agent skill. Apache-2.0, version 0.11, with syntax still settling.
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