Design System Check · product-llc Measure how much of a product's interface actually runs on its design system — inventory the token contract, count every reference to it, and list the escapes (silent classes, raw colours, arbitrary values, off-scale literals, unused tokens) with file and line. Use when someone asks for a design-system audit, "how consistent is our UI", a token usage report, or whether the system is being followed. It delivers measurements and findings, not verdicts on which ones matter.