PURE UI IN THE AGENTIC ERA

Summary from the TLDR Design newsletter

Treating UI as a pure function of state lets developers see how a screen varies across roles, plans, billing statuses, and flags, which matters more now that agents take on front-end implementation work. In a worked example, an agent that tested only an owner account reported success on a delete action, yet viewers still saw the button despite a “View only” header. Rendering every state combination side by side exposes such gaps, so teams should make display-relevant state explicit and ask what an agent actually checked before merging.