Excalidraw

Excalidraw files are deceptively expensive,a single diagram can burn 4k-22k tokens because the JSON is packed with visual metadata (positioning, styling, roughness values) while actual content is maybe 10% of the file. This skill enforces a hard rule: main agents never read .excalidraw files directly, always delegate to subagents instead. The pattern isolates context pollution so you can work with multiple diagrams without torching your budget. Real example from the source: reading 7 project diagrams directly costs 67k tokens (33% of your context), delegating costs about 2k. Worth using even for "small" files or "quick checks" since the smallest diagrams still hit 4k tokens and the temptation to peek is strong.