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feat(desktop): Make Reasoning Collapsable #15259

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9bf3f5f
feat(desktop): Make Reasoning Collapsable
dbpolito Feb 26, 2026
8a3287a
Merge branch 'dev' into desktop_reasoning_collapsable
dbpolito Feb 26, 2026
3d08a33
Merge branch 'dev' into desktop_reasoning_collapsable
dbpolito Mar 1, 2026
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24 changes: 23 additions & 1 deletion packages/ui/src/components/message-part.css
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Expand Up @@ -225,13 +225,35 @@
}
}

[data-component="reasoning-part-trigger"] {
width: 100%;
min-height: 24px;
display: flex;
align-items: center;
justify-content: flex-start;
gap: 0px;
cursor: pointer;

[data-slot="reasoning-part-label"] {
font-family: var(--font-family-sans);
font-size: 14px;
font-weight: var(--font-weight-medium);
line-height: var(--line-height-large);
color: var(--text-strong);
}

[data-slot="collapsible-arrow"] {
color: var(--icon-weaker);
}
}

[data-component="reasoning-part"] {
width: 100%;
color: var(--text-base);
line-height: var(--line-height-normal);

[data-component="markdown"] {
margin-top: 24px;
margin-top: 4px;
font-style: normal;
font-size: inherit;
color: var(--text-weak);
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25 changes: 22 additions & 3 deletions packages/ui/src/components/message-part.tsx
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Expand Up @@ -102,6 +102,7 @@ export interface MessagePartProps {
defaultOpen?: boolean
showAssistantCopyPartID?: string | null
turnDurationMs?: number
working?: boolean
}

export type PartComponent = Component<MessagePartProps>
Expand Down Expand Up @@ -391,6 +392,7 @@ export function AssistantParts(props: {
showAssistantCopyPartID={props.showAssistantCopyPartID}
turnDurationMs={props.turnDurationMs}
defaultOpen={partDefaultOpen(entry().part, props.shellToolDefaultOpen, props.editToolDefaultOpen)}
working={props.working && tail()}
/>
)}
</Show>
Expand Down Expand Up @@ -886,6 +888,7 @@ export function Part(props: MessagePartProps) {
defaultOpen={props.defaultOpen}
showAssistantCopyPartID={props.showAssistantCopyPartID}
turnDurationMs={props.turnDurationMs}
working={props.working}
/>
</Show>
)
Expand Down Expand Up @@ -1142,15 +1145,31 @@ PART_MAPPING["text"] = function TextPartDisplay(props) {
}

PART_MAPPING["reasoning"] = function ReasoningPartDisplay(props) {
const i18n = useI18n()
const part = props.part as ReasoningPart
const text = () => part.text.trim()
const throttledText = createThrottledValue(text)
const [open, setOpen] = createSignal(true)

return (
<Show when={throttledText()}>
<div data-component="reasoning-part">
<Markdown text={throttledText()} cacheKey={part.id} />
</div>
<Collapsible open={open()} onOpenChange={setOpen} variant="ghost">
<Collapsible.Trigger>
<div data-component="reasoning-part-trigger">
<span data-slot="reasoning-part-label">
<Show when={props.working} fallback={i18n.t("ui.sessionTurn.status.reasoningSummary")}>
<TextShimmer text={i18n.t("ui.sessionTurn.status.reasoning")} />
</Show>
</span>
<Collapsible.Arrow />
</div>
</Collapsible.Trigger>
<Collapsible.Content>
<div data-component="reasoning-part">
<Markdown text={throttledText()} cacheKey={part.id} />
</div>
</Collapsible.Content>
</Collapsible>
</Show>
)
}
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2 changes: 2 additions & 0 deletions packages/ui/src/i18n/ar.ts
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Expand Up @@ -55,6 +55,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "تفكير - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "جمع الأفكار",
"ui.sessionTurn.status.consideringNextSteps": "النظر في الخطوات التالية",
"ui.sessionTurn.status.reasoning": "التفكير",
"ui.sessionTurn.status.reasoningSummary": "ملخّص التفكير",

"ui.messagePart.questions.dismissed": "تم رفض الأسئلة",
"ui.messagePart.context.read.one": "{{count}} قراءة",
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2 changes: 2 additions & 0 deletions packages/ui/src/i18n/br.ts
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Expand Up @@ -55,6 +55,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Pensando - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Organizando pensamentos",
"ui.sessionTurn.status.consideringNextSteps": "Considerando próximos passos",
"ui.sessionTurn.status.reasoning": "Raciocínio",
"ui.sessionTurn.status.reasoningSummary": "Resumo do Raciocínio",

"ui.messagePart.questions.dismissed": "Perguntas descartadas",
"ui.messagePart.context.read.one": "{{count}} leitura",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/bs.ts
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Expand Up @@ -59,6 +59,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Razmišljanje - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Sređivanje misli",
"ui.sessionTurn.status.consideringNextSteps": "Razmatranje sljedećih koraka",
"ui.sessionTurn.status.reasoning": "Razmišljanje",
"ui.sessionTurn.status.reasoningSummary": "Sažetak Razmišljanja",

"ui.messagePart.questions.dismissed": "Pitanja odbačena",
"ui.messagePart.context.read.one": "{{count}} čitanje",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/da.ts
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Expand Up @@ -54,6 +54,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Tænker - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Samler tanker",
"ui.sessionTurn.status.consideringNextSteps": "Overvejer næste skridt",
"ui.sessionTurn.status.reasoning": "Ræsonnering",
"ui.sessionTurn.status.reasoningSummary": "Ræsonnerings Oversigt",

"ui.messagePart.questions.dismissed": "Spørgsmål afvist",
"ui.messagePart.context.read.one": "{{count}} læsning",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/de.ts
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Expand Up @@ -60,6 +60,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Denken - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Gedanken sammeln",
"ui.sessionTurn.status.consideringNextSteps": "Nächste Schritte erwägen",
"ui.sessionTurn.status.reasoning": "Überlegung",
"ui.sessionTurn.status.reasoningSummary": "Überlegungs Zusammenfassung",

"ui.messagePart.questions.dismissed": "Fragen verworfen",
"ui.messagePart.context.read.one": "{{count}} Lesevorgang",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/en.ts
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Expand Up @@ -56,6 +56,8 @@ export const dict: Record<string, string> = {
"ui.sessionTurn.status.thinkingWithTopic": "Thinking - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Gathering thoughts",
"ui.sessionTurn.status.consideringNextSteps": "Considering next steps",
"ui.sessionTurn.status.reasoning": "Reasoning",
"ui.sessionTurn.status.reasoningSummary": "Reasoning Summary",

"ui.messagePart.diagnostic.error": "Error",
"ui.messagePart.title.edit": "Edit",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/es.ts
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Expand Up @@ -55,6 +55,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Pensando - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Recopilando pensamientos",
"ui.sessionTurn.status.consideringNextSteps": "Considerando siguientes pasos",
"ui.sessionTurn.status.reasoning": "Razonamiento",
"ui.sessionTurn.status.reasoningSummary": "Resumen del Razonamiento",

"ui.messagePart.questions.dismissed": "Preguntas descartadas",
"ui.messagePart.context.read.one": "{{count}} lectura",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/fr.ts
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Expand Up @@ -55,6 +55,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Réflexion - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Rassemblement des idées",
"ui.sessionTurn.status.consideringNextSteps": "Examen des prochaines étapes",
"ui.sessionTurn.status.reasoning": "Raisonnement",
"ui.sessionTurn.status.reasoningSummary": "Résumé du Raisonnement",

"ui.messagePart.questions.dismissed": "Questions ignorées",
"ui.messagePart.context.read.one": "{{count}} lecture",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/ja.ts
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Expand Up @@ -54,6 +54,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "思考中 - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "考えをまとめています",
"ui.sessionTurn.status.consideringNextSteps": "次のステップを検討中",
"ui.sessionTurn.status.reasoning": "推論",
"ui.sessionTurn.status.reasoningSummary": "推論サマリー",

"ui.messagePart.questions.dismissed": "質問をスキップしました",
"ui.messagePart.context.read.one": "{{count}} 件の読み取り",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/ko.ts
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Expand Up @@ -55,6 +55,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "생각 중 - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "생각 정리 중",
"ui.sessionTurn.status.consideringNextSteps": "다음 단계 고려 중",
"ui.sessionTurn.status.reasoning": "추론",
"ui.sessionTurn.status.reasoningSummary": "추론 요약",

"ui.messagePart.questions.dismissed": "질문 무시됨",
"ui.messagePart.context.read.one": "{{count}}개 읽음",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/no.ts
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Expand Up @@ -58,6 +58,8 @@ export const dict: Record<Keys, string> = {
"ui.sessionTurn.status.thinkingWithTopic": "Tenker - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Samler tanker",
"ui.sessionTurn.status.consideringNextSteps": "Vurderer neste trinn",
"ui.sessionTurn.status.reasoning": "Resonnering",
"ui.sessionTurn.status.reasoningSummary": "Resonnerings Sammendrag",

"ui.messagePart.questions.dismissed": "Spørsmål avvist",
"ui.messagePart.context.read.one": "{{count}} lest",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/pl.ts
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Expand Up @@ -54,6 +54,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Myślenie - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Zbieranie myśli",
"ui.sessionTurn.status.consideringNextSteps": "Rozważanie kolejnych kroków",
"ui.sessionTurn.status.reasoning": "Rozumowanie",
"ui.sessionTurn.status.reasoningSummary": "Podsumowanie Rozumowania",

"ui.messagePart.questions.dismissed": "Pytania odrzucone",
"ui.messagePart.context.read.one": "{{count}} odczyt",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/ru.ts
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Expand Up @@ -54,6 +54,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "Размышление - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "Сбор мыслей",
"ui.sessionTurn.status.consideringNextSteps": "Рассмотрение следующих шагов",
"ui.sessionTurn.status.reasoning": "Рассуждение",
"ui.sessionTurn.status.reasoningSummary": "Сводка Рассуждений",

"ui.messagePart.questions.dismissed": "Вопросы отклонены",
"ui.messagePart.context.read.one": "{{count}} чтение",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/th.ts
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Expand Up @@ -56,6 +56,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "กำลังคิด - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "รวบรวมความคิด",
"ui.sessionTurn.status.consideringNextSteps": "พิจารณาขั้นตอนถัดไป",
"ui.sessionTurn.status.reasoning": "การใช้เหตุผล",
"ui.sessionTurn.status.reasoningSummary": "สรุปการใช้เหตุผล",

"ui.messagePart.questions.dismissed": "ละทิ้งคำถามแล้ว",
"ui.messagePart.context.read.one": "อ่าน {{count}} รายการ",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/zh.ts
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Expand Up @@ -59,6 +59,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "思考：{{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "正在整理思路",
"ui.sessionTurn.status.consideringNextSteps": "正在考虑下一步",
"ui.sessionTurn.status.reasoning": "推理",
"ui.sessionTurn.status.reasoningSummary": "推理摘要",

"ui.messagePart.questions.dismissed": "问题已忽略",
"ui.messagePart.context.read.one": "{{count}} 次读取",
Expand Down
2 changes: 2 additions & 0 deletions packages/ui/src/i18n/zht.ts
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Expand Up @@ -59,6 +59,8 @@ export const dict = {
"ui.sessionTurn.status.thinkingWithTopic": "思考 - {{topic}}",
"ui.sessionTurn.status.gatheringThoughts": "正在整理思緒",
"ui.sessionTurn.status.consideringNextSteps": "正在考慮下一步",
"ui.sessionTurn.status.reasoning": "推理",
"ui.sessionTurn.status.reasoningSummary": "推理摘要",

"ui.messagePart.questions.dismissed": "問題已略過",
"ui.messagePart.context.read.one": "{{count}} 次讀取",
Expand Down
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