React AI chat and agent UI blocks

Prompt composers, streaming answers, tool-call cards, citations, model pickers and token usage meters for React AI apps.

Prompt composer

Auto-growing input, Enter to send, and Stop replacing Send while streaming.

What the model ran and with which arguments, in a native disclosure.

Numbered markers that are real anchors into a source list.

States the speed and cost trade-off, as a proper radio group.

Projects month-end from the run rate, and warns on the projection.

Yields whole under prefers-reduced-motion, and clears its timer on unmount.

Grouped by recency, with delete reachable by keyboard.

A thumbs-down asks what was wrong, turning one bit into signal.