fix(web): throttle useAgent re-renders (fixes UI freeze) + tool-call cards#363
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blove wants to merge 2 commits into
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fix(web): throttle useAgent re-renders (fixes UI freeze) + tool-call cards#363blove wants to merge 2 commits into
blove wants to merge 2 commits into
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Co-Authored-By: Claude Opus 4.8 <[email protected]>
The research UI froze during a full run: useAgent re-renders are UNTHROTTLED by
default (CopilotKit's documented default), so every panel and the sidebar
transcript re-rendered on every streamed token — hundreds per run — pegging the
renderer. Set defaultThrottleMs={100} on <CopilotKit> in both demos.
Also adds a wildcard tool-call card (useRenderTool name:'*') to the research UI,
unwrapping Dawn's JSON-string args and the serialized LangChain ToolMessage so
cards show the real argument and output instead of double-encoded internals.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
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blove
enabled auto-merge (squash)
July 16, 2026 21:43
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The bug (found while adding tool cards)
A full research run froze the web UI — the renderer became unresponsive and never recovered. Root cause, from CopilotKit's own types:
Every
useAgent()consumer —PlanPanel,SubagentActivity,MemoryCandidates, plus theCopilotSidebartranscript — re-rendered on every streamed token. A full research run streams hundreds of events (coordinator tokens + ~200 subagent events), so the main thread got pegged.This is a pre-existing bug in the merged research web (#345), not caused by the cards. Fix:
defaultThrottleMs={100}on<CopilotKit>(~10 re-renders/sec, still live-feeling). Applied to both demos — the chat UI has the identical latent issue.Tool-call cards (the original feature)
A wildcard
useRenderTool({ name: "*" })card in the research UI showing each tool's name, status, argument, and output. It unwraps two layers of noise:input→ cards showed{"input":"{\"path\":\"…\"}"}. Now:corpus/retrieval-augmented-generation.md.ToolMessage→ cards dumped{"lc":1,"type":"constructor",…}. Now: the actual content.Test plan
Verified live in Chrome against a real model (research demo, full run):
researchersubagent dispatches streamed, cards rendered cleanly (recall→(no memories found),searchCorpus→RAG,readDoc→corpus/retrieval-augmented-generation.md+ real content).typecheck+buildgreen for@dawn-example/research-weband@dawn-example/chat-web.🤖 Generated with Claude Code