- useChat throttles streamed message updates (experimental_throttle,
150 ms), replacing the two hand-written 150 ms timers of the
display_diagram and edit_diagram previews (94 lines less). The preview
now only runs while the input streams; once it is complete the tool
handler takes over, so a queued preview can no longer redraw an edit
the handler rejected and rolled back. Measured on a streamed 60-cell
diagram: 41 redraws at least 97 ms apart, before 37 with gaps down to
48 ms
- The diagram check endpoint uses streamText with Output.object instead
of the deprecated streamObject, and returns its fixed result as a plain
text response; new route test
- Import createGateway/gateway from ai and drop the direct
@ai-sdk/gateway dependency
- The per-request message structure logs only print with
DEBUG_LLM_PAYLOAD=true
- Remove an empty onFinish callback
