the generative-UI substrate

ADR-059

three building blocks for the high-frequency cockpit · signals for sub-frame reactivity · streamUI for agent-composed surfaces · context tokens that flip at runtime without a single React render.

01 · signals

@preact/signals-react · 30 hz · zero reconciliation

one rAF loop · two signal writes · no React state · the parent tree never re-renders. only the leaf spans that read .value update.

ETH$3490.41+0.000 hz · 0 ticks · 00:00:00z

02 · streamUI

/api/agent-stream?mode=streamUI · A2UI delta channel

the agent emits paired AG-UI events and A2UI deltas. each delta upserts a node in the local tree. the renderer paints generative UI as it arrives.

0 deltas · 1 nodes

generated

canvas empty · click run to compose

03 · context-aware tokens

data-alert-state · data-density · zero re-render

flipping the attribute on body cascades through every consumer · brand-signal becomes amber, then red · spacing trims with density · no react render runs in the leaves.

alert state

density

observers · live

brand-signal

chip · cascaderow · h · density-bound