HeroUI’s install CLI now writes a capital-letter warning straight into a fresh project’s AGENTS.md, telling the coding agent that its memory of the old API is wrong. The hosts work through Kaelig Deloumeau-Prigent’s survey of 157 such techniques across 20 open-source design systems — validation loops and outright prohibitions dominate, while binding a design file to the code it should produce is nearly unbuilt, with only Carbon and Primer wiring in Figma’s own Code Connect.
They also trace what the survey can and can’t show: it’s a census of what maintainers wrote, not a trial of whether the writing works, and two adjacent studies on Python libraries and documentation habits offer support without ever touching a React library. The episode closes on the asymmetry the survey surfaces — open-source systems are exposed to this problem precisely because their old code fills public training data, while private design systems face the opposite one entirely.