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feat(ui): Add thinking/reasoning block visibility toggle #9139

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feat(ui): Add thinking/reasoning block visibility toggle #9139

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32f2ee3
feat(ui): Add thinking/reasoning block visibility toggle
sauerdaniel Jan 17, 2026
a5ec579
chore(ui): type mouse events in thinking toggle
sauerdaniel Feb 10, 2026
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32 changes: 31 additions & 1 deletion packages/ui/src/components/session-turn.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -378,6 +378,17 @@ export function SessionTurn(

const isShellMode = createMemo(() => !!shellModePart())

const hasReasoningParts = createMemo(() => {
for (const m of assistantMessages()) {
const msgParts = data.store.part[m.id]
if (!msgParts) continue
for (const p of msgParts) {
if (p?.type === "reasoning") return true
}
}
return false
})

const rawStatus = createMemo(() => {
const msgs = assistantMessages()
let last: PartType | undefined
Expand Down Expand Up @@ -514,6 +525,8 @@ export function SessionTurn(
retrySeconds: 0,
status: rawStatus(),
duration: duration(),
userMessageHovered: false,
showReasoning: false,
})

createEffect(() => {
Expand Down Expand Up @@ -747,7 +760,7 @@ export function SessionTurn(
message={assistantMessage}
responsePartId={responsePartId()}
hideResponsePart={hideResponsePart()}
hideReasoning={!working()}
hideReasoning={!working() && !store.showReasoning}
hidden={hidden}
/>
)}
Expand Down Expand Up @@ -775,6 +788,22 @@ export function SessionTurn(
<div data-slot="session-turn-summary-header">
<div data-slot="session-turn-summary-title-row">
<h2 data-slot="session-turn-summary-title">{i18n.t("ui.sessionTurn.summary.response")}</h2>

<Show when={hasReasoningParts()}>
<Button
data-slot="session-turn-thinking-toggle"
variant="ghost"
size="small"
onMouseDown={(e: MouseEvent) => e.preventDefault()}
onClick={(event: MouseEvent) => {
event.stopPropagation()
setStore("showReasoning", (prev) => !prev)
}}
>
{store.showReasoning ? "Hide thinking" : "Show thinking"}
</Button>
</Show>

<Show when={response()}>
<div data-slot="session-turn-response-copy-wrapper">
<Tooltip
Expand All @@ -797,6 +826,7 @@ export function SessionTurn(
</div>
</Show>
</div>

<div data-slot="session-turn-response">
<Markdown
data-slot="session-turn-markdown"
Expand Down
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