Half of a good diagram is decided by choosing the type
A good diagram starts not with decoration but with showing relationships accurately. First decide whether the reader needs to see flow, time, hierarchy, or comparison, then choose the type that fits.
Don't use the default style after installing the skill
diagram-design offers onboarding that reflects your project's colors and fonts. Review the brand tokens, confirm the contrast is sufficient, and settle on a style with one small example.
Reread the exported files
Small text that looks fine in HTML can be hard to read in a slide or document. Open both the SVG and the PNG, and do a final check of key labels, alt text, and margins.
Official resource: diagram-design repository