feat(chat): render reasoning parts - #7135
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Superseded by #7139 which contains the corrected rendering-only implementation |
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Summary
Adds opt-in rendering for Chat reasoning parts so the Agent Studio Dashboard can preserve its existing reasoning disclosure when moving to InstantSearch Chat.
showReasoningdefaults tofalse. When enabled, reasoning is rendered in its original message order around tool calls and the final answer, collapsed by default. Only the active reasoning part shows progress.This also keeps restored conversations stable. Replayed text, reasoning, tools and structural parts are reconciled without duplication, output guardrails stop trailing content and restored client tools retain a single callback owner.
This narrows #7105 to the rendering and stream behavior required by FX-3831. It does not add summaries, PII heuristics, loading captions, additional visibility modes or a custom Dashboard chat implementation.
Result
Enable reasoning in React:
Or InstantSearch.js:
Covered behavior includes:
Reasoning parts
Each reasoning part is rendered as an independent disclosure and keeps its open state while the response streams.
Screen.Recording.2026-07-24.at.16.30.52.mov