diff --git a/src/renderer/src/components/sidebar/WorktreeCardSlotAgentLines.tsx b/src/renderer/src/components/sidebar/WorktreeCardSlotAgentLines.tsx
index 7a210c93c19..b80b513a043 100644
--- a/src/renderer/src/components/sidebar/WorktreeCardSlotAgentLines.tsx
+++ b/src/renderer/src/components/sidebar/WorktreeCardSlotAgentLines.tsx
@@ -1,4 +1,5 @@
 import React, { useCallback } from 'react'
+import { ChevronDown } from 'lucide-react'
 import type { DashboardAgentRow } from '@/components/dashboard/useDashboardData'
 import { useAgentRowConversationName } from '@/components/dashboard/use-agent-row-conversation-name'
 import { translate } from '@/i18n/i18n'
@@ -103,6 +104,46 @@ const SlotAgentLineRow = React.memo(function SlotAgentLineRow({
   )
 })
 
+/** Expanded agents' header: the label sits in the icon column and the chevron in the slot column. */
+export function SlotAgentLinesHeader({
+  label,
+  onCollapse
+}: {
+  label: string
+  onCollapse: () => void
+}): React.JSX.Element {
+  const handleClick = useCallback(
+    (event: React.MouseEvent) => {
+      event.stopPropagation()
+      onCollapse()
+    },
+    [onCollapse]
+  )
+  return (
+    <button
+      type="button"
+      draggable={false}
+      className="worktree-agent-row-hover mt-[3px] flex h-[19px] w-full min-w-0 items-center gap-1.5 rounded-sm pr-2 text-left text-2xs leading-none font-medium text-muted-foreground outline-none focus-visible:ring-1 focus-visible:ring-worktree-sidebar-ring"
+      aria-expanded={true}
+      aria-label={translate(
+        'auto.components.sidebar.worktree.card.compact.agents.0c1debfe84',
+        'Collapse {{value0}}',
+        { value0: label }
+      )}
+      onClick={handleClick}
+      onMouseDown={stopPropagation}
+      onPointerDown={stopPropagation}
+    >
+      <span className="min-w-0 flex-1 truncate">{label}</span>
+      <ChevronDown className="size-3 shrink-0" aria-hidden />
+    </button>
+  )
+}
+
+function stopPropagation(event: React.SyntheticEvent): void {
+  event.stopPropagation()
+}
+
 /** Experimental 2.0 agent lines: icon, what it's doing or said, and the line's own slot. */
 export function WorktreeCardSlotAgentLines({
   worktreeId,
@@ -138,7 +179,7 @@ export function WorktreeCardSlotAgentLines({
   }
   return (
     <div
-      className="mt-px flex flex-col gap-px pl-3.5"
+      className="mt-px flex flex-col gap-px"
       role="group"
       aria-label={translate('auto.components.sidebar.WorktreeCardAgents.1b0a156717', 'Agents')}
       onDoubleClick={stopBubble}
diff --git a/src/renderer/src/components/sidebar/WorktreeCardSlotContent.fixture.tsx b/src/renderer/src/components/sidebar/WorktreeCardSlotContent.fixture.tsx
index 825cac694b5..39d07e3dd48 100644
--- a/src/renderer/src/components/sidebar/WorktreeCardSlotContent.fixture.tsx
+++ b/src/renderer/src/components/sidebar/WorktreeCardSlotContent.fixture.tsx
@@ -7,6 +7,7 @@ import type { Worktree } from '../../../../shared/worktree/types'
 import { folderWorkspaceToWorktree } from '../../../../shared/folder-workspaces/folder-workspace-worktree'
 import { worktreeCardStyleSettingsUpdate } from '../../../../shared/worktree/card-style'
 import WorktreeCard from './workspace-card/surface/WorktreeCard'
+import * as agentExpansion from './workspace-card/activity/worktree-card-agents-expansion-state'
 
 const MINUTE = 60_000
 const SIDEBAR_WIDTH = 320
@@ -56,6 +57,7 @@ function makeWorktree(seed: WorkspaceSeed, now: number): Worktree {
 }
 
 function seedWorkspaces(seeds: readonly WorkspaceSeed[], now: number): void {
+  agentExpansion.clearWorktreeAgentExpansionStateForTests()
   const tabsByWorktree: Record<string, TerminalTab[]> = {}
   const agentStatusByPaneKey: Record<string, AgentStatusEntry> = {}
   const unreadAgentCompletionPanes: Record<string, 'agent-completion'> = {}
@@ -76,7 +78,9 @@ function seedWorkspaces(seeds: readonly WorkspaceSeed[], now: number): void {
         stateHistory: [],
         ...(agent.toolName ? { toolName: agent.toolName, toolInput: agent.toolInput } : {}),
         ...(agent.message ? { lastAssistantMessage: agent.message } : {}),
-        ...(agent.failed ? { mainAgent: { state: 'done', outcome: 'failure', stateStartedAt: now } } : {})
+        ...(agent.failed
+          ? { mainAgent: { state: 'done', outcome: 'failure', stateStartedAt: now } }
+          : {})
       }
       ptyIdsByTabId[tabId] = [`pty-${tabId}`]
       if (agent.unread) {
@@ -309,7 +313,7 @@ function Card({
   children,
   childCount = 0,
   collapsed = false,
-  hiddenDescendantIds
+  descendantIds
 }: {
   worktree: Worktree
   nested?: boolean
@@ -317,7 +321,7 @@ function Card({
   children?: React.ReactNode
   childCount?: number
   collapsed?: boolean
-  hiddenDescendantIds?: readonly string[]
+  descendantIds?: readonly string[]
 }): React.JSX.Element {
   return (
     <div className="relative" data-worktree-id={worktree.id}>
@@ -330,7 +334,7 @@ function Card({
         nativeDragEnabled={false}
         lineageChildCount={childCount}
         lineageCollapsed={collapsed}
-        lineageHiddenDescendantIds={hiddenDescendantIds}
+        lineageDescendantIds={descendantIds}
         lineageChildren={children}
         onLineageToggle={childCount > 0 ? noop : undefined}
       />
@@ -348,10 +352,8 @@ const nestedWorktrees = worktreesFor(NESTED, now)
 FOLDER_WORKSPACE.isUnread = false
 FOLDER_WORKSPACE.lastActivityAt = now - 9 * MINUTE
 
-export const exceptions = defineFixture({
-  width: SIDEBAR_WIDTH,
-  setup: () => seedWorkspaces(FLAT, now),
-  render: () => (
+function FlatList(): React.JSX.Element {
+  return (
     <SidebarFrame>
       {FLAT.map((seed) => (
         <Card
@@ -363,6 +365,12 @@ export const exceptions = defineFixture({
       <Card worktree={FOLDER_WORKSPACE} />
     </SidebarFrame>
   )
+}
+
+export const exceptions = defineFixture({
+  width: SIDEBAR_WIDTH,
+  setup: () => seedWorkspaces(FLAT, now),
+  render: () => <FlatList />
 })
 
 export const nesting = defineFixture({
@@ -370,8 +378,17 @@ export const nesting = defineFixture({
   setup: () => seedWorkspaces(NESTED, now),
   render: () => (
     <SidebarFrame>
-      <Card worktree={nestedWorktrees.get('wt-parent')!} childCount={1}>
-        <Card nested worktree={nestedWorktrees.get('wt-child')!} childCount={1}>
+      <Card
+        worktree={nestedWorktrees.get('wt-parent')!}
+        childCount={1}
+        descendantIds={['wt-child', 'wt-grandchild']}
+      >
+        <Card
+          nested
+          worktree={nestedWorktrees.get('wt-child')!}
+          childCount={1}
+          descendantIds={['wt-grandchild']}
+        >
           <Card nested worktree={nestedWorktrees.get('wt-grandchild')!} />
         </Card>
       </Card>
@@ -379,8 +396,23 @@ export const nesting = defineFixture({
         worktree={nestedWorktrees.get('wt-collapsed-parent')!}
         childCount={1}
         collapsed
-        hiddenDescendantIds={['wt-collapsed-child']}
+        descendantIds={['wt-collapsed-child']}
       />
     </SidebarFrame>
   )
 })
+
+export const agentsExpanded = defineFixture({
+  width: SIDEBAR_WIDTH,
+  setup: () => {
+    seedWorkspaces(FLAT, now)
+    const none = new Set<string>()
+    const state = {
+      expandedLineageParents: none,
+      expandedIdleChildGroups: none,
+      compactRootListExpanded: true
+    }
+    FLAT.forEach((seed) => agentExpansion.seedWorktreeAgentExpansionStateForTests(seed.id, state))
+  },
+  render: () => <FlatList />
+})
diff --git a/src/renderer/src/components/sidebar/WorktreeCardSlotContent.tsx b/src/renderer/src/components/sidebar/WorktreeCardSlotContent.tsx
index de53bdcb4d2..ba3fc9499b1 100644
--- a/src/renderer/src/components/sidebar/WorktreeCardSlotContent.tsx
+++ b/src/renderer/src/components/sidebar/WorktreeCardSlotContent.tsx
@@ -1,4 +1,4 @@
-import React, { useMemo } from 'react'
+import React, { useCallback, useMemo } from 'react'
 import { ChevronDown, ChevronRight } from 'lucide-react'
 import { useShallow } from 'zustand/react/shallow'
 
@@ -14,7 +14,7 @@ import { agentRowDisplayDotState as getAgentDotState } from '@/lib/agent-row-dot
 import { WorktreeCardIdentityHover } from './worktree-card-identity-hover'
 import type { WorktreeCardPresentation } from './workspace-card/surface/worktree-card-presentation'
 import { WorktreeCardSecondaryRows } from './workspace-card/surface/worktree-card-secondary-rows'
-import { useCollapsedLineageSlot } from './worktree-card-slot-rollup'
+import { useCollapsedLineageSlot, useLineageLatestAt } from './worktree-card-slot-rollup'
 import {
   classifySlotLine,
   compareSlotLines,
@@ -26,9 +26,21 @@ import {
   WorktreeCardRenameFailedButton
 } from './worktree-card-title-actions'
 import { WorktreeCardSlot } from './WorktreeCardSlot'
-import { WorktreeCardSlotAgentLines, type SlotAgentLine } from './WorktreeCardSlotAgentLines'
+import { useWorktreeAgentExpansionState } from './workspace-card/activity/worktree-card-agents-expansion-state'
+import {
+  CompactAgentExpansion,
+  CompactAgentSummaryButton
+} from './workspace-card/activity/worktree-card-compact-agents'
+import { dispatchSuppressScrollAdjustment } from './workspace-card/activity/WorktreeCardAgents'
+import { translate } from '@/i18n/i18n'
+import {
+  SlotAgentLinesHeader,
+  WorktreeCardSlotAgentLines,
+  type SlotAgentLine
+} from './WorktreeCardSlotAgentLines'
 import { shouldBeginWorktreeRename } from './workspace-card/controller/worktree-card-model'
 import { WorktreeTitleInlineRename } from './workspace-card/identity/WorktreeTitleInlineRename'
+import { WorktreeCardMetaRow } from './workspace-card/metadata/worktree-card-meta-row'
 
 const NO_DESCENDANTS: readonly string[] = []
 
@@ -79,42 +91,82 @@ export function WorktreeCardSlotContent({
     showDeleteQuickAction,
     showLineageChildChip,
     lineageCollapsed,
-    lineageHiddenDescendantIds,
+    lineageDescendantIds,
     onLineageToggle,
     lineageChildAriaLabel,
-    childWorkspaceShortLabel
+    childWorkspaceShortLabel,
+    settings
   } = card
   const lines = useSlotAgentLines(worktree.id)
   const now = useNow(30_000)
   const hasLiveMarker = useAppStore((s) => workspaceHasLiveMarker(s, worktree.id))
   // A flag with no tab or agent marker behind it was set by the user.
   const manualUnread = worktree.isUnread && !hasLiveMarker
+  const descendantIds = lineageDescendantIds ?? NO_DESCENDANTS
   const collapsedLineage = useCollapsedLineageSlot(
-    lineageCollapsed ? (lineageHiddenDescendantIds ?? NO_DESCENDANTS) : NO_DESCENDANTS
+    lineageCollapsed ? descendantIds : NO_DESCENDANTS
   )
-  const ownLinesShown = showInlineAgentList && lines.length > 0
+  const lineageLatestAt = useLineageLatestAt(descendantIds)
+  // Several agents fold into the 1.0 summary row; the title slot speaks for them until expanded.
+  const { compactRootListExpanded: agentsExpanded, toggleCompactRootList } =
+    useWorktreeAgentExpansionState(worktree.id)
+  const toggleAgents = useCallback(() => {
+    dispatchSuppressScrollAdjustment()
+    toggleCompactRootList()
+  }, [toggleCompactRootList])
+  const showLines = showInlineAgentList && lines.length > 0
+  const foldsAgents = showLines && lines.length > 1
+  const ownLinesShown = showLines && (!foldsAgents || agentsExpanded)
   const titleSlot = titleRowSlot({
     offline: isRuntimeDisconnected,
     hiddenLines: ownLinesShown ? [] : lines.map((line) => line.signal),
     collapsedLineage,
     manualUnread,
     ownLinesShown,
-    lastActivityAt: worktree.lastActivityAt > 0 ? worktree.lastActivityAt : null
+    lastActivityAt: worktree.lastActivityAt > 0 ? worktree.lastActivityAt : null,
+    lineageLatestAt
   })
+  const showDetailsRow =
+    settings?.worktreeCardDetailsRow === true &&
+    (presentation.hasMetaRow || presentation.detailsAndPorts !== null)
   const titleBold = manualUnread || lines.some((line) => line.signal.kind === 'unread')
 
+  const agentLines = showLines ? (
+    <WorktreeCardSlotAgentLines
+      worktreeId={worktree.id}
+      lines={lines}
+      now={now}
+      offline={isRuntimeDisconnected}
+    />
+  ) : null
+
+  const agentCountLabel = translate('sidebar.agentSummary.agentCount', '{{count}} agents', {
+    count: lines.length,
+    defaultValue_one: '{{count}} agent'
+  })
   const slotRows = (
     <>
-      {ownLinesShown ? (
-        <WorktreeCardSlotAgentLines
-          worktreeId={worktree.id}
-          lines={lines}
-          now={now}
-          offline={isRuntimeDisconnected}
-        />
-      ) : null}
+      {foldsAgents ? (
+        <>
+          {agentsExpanded ? (
+            <SlotAgentLinesHeader label={agentCountLabel} onCollapse={toggleAgents} />
+          ) : (
+            <div className="mt-[3px] min-w-0 pr-2">
+              <CompactAgentSummaryButton
+                agents={lines.map((line) => line.agent)}
+                subjectLabel={agentCountLabel}
+                expanded={false}
+                onToggle={toggleAgents}
+              />
+            </div>
+          )}
+          <CompactAgentExpansion expanded={agentsExpanded}>{agentLines}</CompactAgentExpansion>
+        </>
+      ) : (
+        agentLines
+      )}
       {showLineageChildChip ? (
-        <div className="mt-[3px] flex min-w-0 pl-3.5">
+        <div className="mt-[3px] flex min-w-0">
           <Button
             type="button"
             variant="outline"
@@ -144,32 +196,51 @@ export function WorktreeCardSlotContent({
     >
       <WorktreeCardIdentityHover card={card} presentation={presentation}>
         <div
-          className="group/worktree-card flex h-5 min-w-0 items-center gap-1.5 pr-2"
+          className="group/worktree-card flex min-w-0 flex-col"
           data-worktree-card-hover-trigger=""
         >
-          <WorktreeTitleInlineRename
-            displayName={visibleCardTitle}
-            disabled={isDeleting || affiliateListMode}
-            showUnreadEmphasis={titleBold}
-            dimReadTitle
-            className="text-[13px] leading-5"
-            editingClassName="flex-1"
-            titleWrapper={presentation.titleWrapper}
-            onEditingChange={affiliateListMode ? undefined : setTitleRenaming}
-            onRename={handleRenameTitle}
-            beginEditing={
-              !affiliateListMode &&
-              shouldBeginWorktreeRename(renamingWorktreeId, worktree.id, renameRowKey)
-            }
-            onBeginEditingConsumed={
-              affiliateListMode ? undefined : () => setRenamingWorktreeId(null)
-            }
-          />
-          <WorktreeCardRenameFailedButton card={card} />
-          <span className="ml-auto flex shrink-0 items-center gap-1">
-            {showDeleteQuickAction ? <WorktreeCardDeleteQuickAction card={card} /> : null}
-            <WorktreeCardSlot signal={titleSlot} now={now} />
-          </span>
+          <div className="flex h-5 min-w-0 items-center gap-1.5 pr-2">
+            <WorktreeTitleInlineRename
+              displayName={visibleCardTitle}
+              disabled={isDeleting || affiliateListMode}
+              showUnreadEmphasis={titleBold}
+              dimReadTitle
+              className="text-[13px] leading-5"
+              editingClassName="flex-1"
+              titleWrapper={presentation.titleWrapper}
+              onEditingChange={affiliateListMode ? undefined : setTitleRenaming}
+              onRename={handleRenameTitle}
+              beginEditing={
+                !affiliateListMode &&
+                shouldBeginWorktreeRename(renamingWorktreeId, worktree.id, renameRowKey)
+              }
+              onBeginEditingConsumed={
+                affiliateListMode ? undefined : () => setRenamingWorktreeId(null)
+              }
+            />
+            <WorktreeCardRenameFailedButton card={card} />
+            <span className="ml-auto flex shrink-0 items-center gap-1">
+              {showDeleteQuickAction ? <WorktreeCardDeleteQuickAction card={card} /> : null}
+              <WorktreeCardSlot signal={titleSlot} now={now} />
+            </span>
+          </div>
+          {showDetailsRow ? (
+            <div
+              className="mt-1 mb-1 flex h-4 min-w-0 items-center gap-1.5 pr-2"
+              data-worktree-card-details-row=""
+            >
+              {presentation.hasMetaRow ? (
+                <div className="min-w-0 flex-1 pl-2">
+                  <WorktreeCardMetaRow card={card} presentation={presentation} />
+                </div>
+              ) : null}
+              {presentation.detailsAndPorts ? (
+                <div className="ml-auto flex shrink-0 items-center gap-1">
+                  {presentation.detailsAndPorts}
+                </div>
+              ) : null}
+            </div>
+          ) : null}
         </div>
       </WorktreeCardIdentityHover>
       <WorktreeCardSecondaryRows card={card} presentation={presentation} slotRows={slotRows} />
diff --git a/src/renderer/src/components/sidebar/workspace-card/activity/WorktreeCardAgents.tsx b/src/renderer/src/components/sidebar/workspace-card/activity/WorktreeCardAgents.tsx
index 6120278a81e..7494a8434f5 100644
--- a/src/renderer/src/components/sidebar/workspace-card/activity/WorktreeCardAgents.tsx
+++ b/src/renderer/src/components/sidebar/workspace-card/activity/WorktreeCardAgents.tsx
@@ -32,6 +32,13 @@ import {
 } from './worktree-card-idle-child-agents'
 import { recomputeOn } from '@/lib/recompute-on'
 
+export const SUPPRESS_WORKTREE_LIST_SCROLL_ADJUSTMENT_EVENT =
+  'orca-suppress-worktree-list-scroll-adjustment'
+
+export const dispatchSuppressScrollAdjustment = () => {
+  window.dispatchEvent(new CustomEvent(SUPPRESS_WORKTREE_LIST_SCROLL_ADJUSTMENT_EVENT))
+}
+
 type Props = {
   worktreeId: string
   agents?: DashboardAgentRowData[]
diff --git a/src/renderer/src/components/sidebar/workspace-card/controller/worktree-card-model.ts b/src/renderer/src/components/sidebar/workspace-card/controller/worktree-card-model.ts
index 79120ee9227..c8cb1c2c1f2 100644
--- a/src/renderer/src/components/sidebar/workspace-card/controller/worktree-card-model.ts
+++ b/src/renderer/src/components/sidebar/workspace-card/controller/worktree-card-model.ts
@@ -37,8 +37,8 @@ export type WorktreeCardProps = {
   lineageChildCount?: number
   lineageChildWorktreeIds?: readonly string[]
   lineageCollapsed?: boolean
-  /** Workspaces folded under a collapsed parent; the 2.0 card reports their exceptions. */
-  lineageHiddenDescendantIds?: readonly string[]
+  /** Workspaces nested under this one; the 2.0 card rolls up their latest time and, when collapsed, their exceptions. */
+  lineageDescendantIds?: readonly string[]
   lineageChildren?: React.ReactNode
   lineageChildrenStyle?: React.CSSProperties
   onLineageToggle?: (event: React.MouseEvent<HTMLButtonElement>) => void
diff --git a/src/renderer/src/components/sidebar/workspace-card/details/worktree-card-details-items.tsx b/src/renderer/src/components/sidebar/workspace-card/details/worktree-card-details-items.tsx
index d17bf62cb1c..48f00599a28 100644
--- a/src/renderer/src/components/sidebar/workspace-card/details/worktree-card-details-items.tsx
+++ b/src/renderer/src/components/sidebar/workspace-card/details/worktree-card-details-items.tsx
@@ -11,7 +11,9 @@ import type { WorktreeCardController } from '../controller/use-worktree-card-con
 export function renderWorktreeCardIndicators(
   card: WorktreeCardController
 ): React.ReactElement | null {
-  const { worktree, hasDetails, hasPorts, newCardStyle, showPR, showIssue } = card
+  const { worktree, hasDetails, hasPorts, showPR, showIssue } = card
+  // 1.0 draws the PR in its status lane; 2.0 has no lane, so it lists the PR like Classic.
+  const newCardStyle = card.newCardStyle && card.worktreeCardStyle !== 'experimental-2'
   if (!hasDetails && !hasPorts) {
     return null
   }
diff --git a/src/renderer/src/components/sidebar/workspace-card/surface/WorktreeCard.tsx b/src/renderer/src/components/sidebar/workspace-card/surface/WorktreeCard.tsx
index 2308b9ea0e4..e86081dac97 100644
--- a/src/renderer/src/components/sidebar/workspace-card/surface/WorktreeCard.tsx
+++ b/src/renderer/src/components/sidebar/workspace-card/surface/WorktreeCard.tsx
@@ -36,7 +36,7 @@ const WorktreeCard = React.memo(function WorktreeCard({
   lineageChildCount = 0,
   lineageChildWorktreeIds,
   lineageCollapsed = false,
-  lineageHiddenDescendantIds,
+  lineageDescendantIds,
   lineageChildren,
   lineageChildrenStyle,
   onLineageToggle,
@@ -74,7 +74,7 @@ const WorktreeCard = React.memo(function WorktreeCard({
     lineageChildCount,
     lineageChildWorktreeIds,
     lineageCollapsed,
-    lineageHiddenDescendantIds,
+    lineageDescendantIds,
     lineageChildren,
     lineageChildrenStyle,
     onLineageToggle,
diff --git a/src/renderer/src/components/sidebar/workspace-card/surface/worktree-card-option-items.tsx b/src/renderer/src/components/sidebar/workspace-card/surface/worktree-card-option-items.tsx
index ca5f1ddf5c2..8c82d86065e 100644
--- a/src/renderer/src/components/sidebar/workspace-card/surface/worktree-card-option-items.tsx
+++ b/src/renderer/src/components/sidebar/workspace-card/surface/worktree-card-option-items.tsx
@@ -19,6 +19,7 @@ import {
   getWorktreeCardDisplayOptions
 } from '../../worktree-list/controls/sidebar-workspace-option-items'
 import { useTranslate } from '@/i18n/use-translate'
+import { getWorktreeCardStyle } from '../../../../../../shared/worktree/card-style'
 
 type CardMenuItemProps = {
   preserveWorkspaceBoardOpen: boolean
@@ -68,6 +69,9 @@ export function WorktreeCardDisplayMenuItem({
   const hasProjectGroups = useAppStore((s) => s.projectGroups.length > 0)
   const toggleProperty = useToggleCardProperty()
   const options = useMemo(() => getWorktreeCardDisplayOptions(hasProjectGroups), [hasProjectGroups])
+  const slotLayout = useAppStore((s) => getWorktreeCardStyle(s.settings) === 'experimental-2')
+  const detailsRow = useAppStore((s) => s.settings?.worktreeCardDetailsRow === true)
+  const updateSettings = useAppStore((s) => s.updateSettings)
   return (
     <DropdownMenuSub>
       <DropdownMenuSubTrigger>
@@ -82,6 +86,20 @@ export function WorktreeCardDisplayMenuItem({
         className="w-56"
         data-workspace-board-preserve-open={boardAttr(preserveWorkspaceBoardOpen)}
       >
+        {slotLayout ? (
+          <>
+            <DropdownMenuCheckboxItem
+              checked={detailsRow}
+              onCheckedChange={(checked) =>
+                void updateSettings({ worktreeCardDetailsRow: checked === true })
+              }
+              onSelect={(e) => e.preventDefault()}
+            >
+              {t('sidebar.cardSlot.detailsRow', 'Details row')}
+            </DropdownMenuCheckboxItem>
+            <DropdownMenuSeparator />
+          </>
+        ) : null}
         {options.map((opt) => (
           <DropdownMenuCheckboxItem
             key={opt.id}
diff --git a/src/renderer/src/components/sidebar/worktree-card-slot-rollup.ts b/src/renderer/src/components/sidebar/worktree-card-slot-rollup.ts
index 6317b88b269..9382533074d 100644
--- a/src/renderer/src/components/sidebar/worktree-card-slot-rollup.ts
+++ b/src/renderer/src/components/sidebar/worktree-card-slot-rollup.ts
@@ -73,3 +73,33 @@ export function useCollapsedLineageSlot(descendantIds: readonly string[]): SlotS
   )
   return useAppStore(useShallow(selector))
 }
+
+/** The most recent activity among child workspaces, so a parent never looks older than its children. */
+export function selectLineageLatestAt(
+  state: AppState,
+  descendantIds: readonly string[]
+): number | null {
+  let at = 0
+  const worktreeMap = getWorktreeMapFromState(state)
+  for (const worktreeId of descendantIds) {
+    at = Math.max(at, worktreeMap.get(worktreeId)?.lastActivityAt ?? 0)
+    for (const entry of selectLiveAgentStatusEntriesForWorktree(state, worktreeId)) {
+      at = Math.max(at, entry.stateStartedAt)
+    }
+    for (const retained of selectRetainedAgentEntriesForWorktree(state, worktreeId)) {
+      at = Math.max(at, retained.entry.stateStartedAt)
+    }
+  }
+  return at > 0 ? at : null
+}
+
+export function useLineageLatestAt(descendantIds: readonly string[]): number | null {
+  const descendantKey = descendantIds.join('\n')
+  return useAppStore(
+    useCallback(
+      (state: AppState) =>
+        selectLineageLatestAt(state, descendantKey ? descendantKey.split('\n') : []),
+      [descendantKey]
+    )
+  )
+}
diff --git a/src/renderer/src/components/sidebar/worktree-card-slot-signal.ts b/src/renderer/src/components/sidebar/worktree-card-slot-signal.ts
index 9b1852813dc..3b98993d333 100644
--- a/src/renderer/src/components/sidebar/worktree-card-slot-signal.ts
+++ b/src/renderer/src/components/sidebar/worktree-card-slot-signal.ts
@@ -136,6 +136,7 @@ export function titleRowSlot(args: {
   manualUnread: boolean
   ownLinesShown: boolean
   lastActivityAt: number | null
+  lineageLatestAt?: number | null
 }): SlotSignal {
   if (args.offline) {
     return { kind: 'offline' }
@@ -150,5 +151,10 @@ export function titleRowSlot(args: {
   if (args.ownLinesShown) {
     return { kind: 'quiet' }
   }
-  return { kind: 'time', at: latest(args.hiddenLines) ?? args.lastActivityAt }
+  const ownAt = latest(args.hiddenLines) ?? args.lastActivityAt
+  const lineageAt = args.lineageLatestAt ?? null
+  return {
+    kind: 'time',
+    at: ownAt === null || (lineageAt !== null && lineageAt > ownAt) ? lineageAt : ownAt
+  }
 }
diff --git a/src/renderer/src/components/sidebar/worktree-list/rows/item-row.tsx b/src/renderer/src/components/sidebar/worktree-list/rows/item-row.tsx
index 85aefc4b87c..089926e166c 100644
--- a/src/renderer/src/components/sidebar/worktree-list/rows/item-row.tsx
+++ b/src/renderer/src/components/sidebar/worktree-list/rows/item-row.tsx
@@ -140,7 +140,7 @@ export function renderWorktreeItemRow(
         lineageChildCount={itemRow.lineageChildCount}
         lineageChildWorktreeIds={itemRow.lineageChildWorktreeIds}
         lineageCollapsed={itemRow.lineageCollapsed}
-        lineageHiddenDescendantIds={itemRow.lineageHiddenDescendantIds}
+        lineageDescendantIds={itemRow.lineageDescendantIds}
         onLineageToggle={
           itemRow.lineageGroupKey ? ctx.getLineageToggleHandler(itemRow.lineageGroupKey) : undefined
         }
diff --git a/src/renderer/src/i18n/locales/en.json b/src/renderer/src/i18n/locales/en.json
index 978c42308e1..23c2e52e9e5 100644
--- a/src/renderer/src/i18n/locales/en.json
+++ b/src/renderer/src/i18n/locales/en.json
@@ -264,7 +264,8 @@
       "needYouCount": "{{count}} need you",
       "needsYou": "Needs you",
       "failed": "Failed",
-      "lastSeen": "Last seen {{state}}"
+      "lastSeen": "Last seen {{state}}",
+      "detailsRow": "Details row"
     }
   },
   "app": {
diff --git a/src/shared/global-settings-base.ts b/src/shared/global-settings-base.ts
index 7a143d0c853..487c572b5d7 100644
--- a/src/shared/global-settings-base.ts
+++ b/src/shared/global-settings-base.ts
@@ -2,6 +2,7 @@ import type { AntigravityChatAuthSettings } from './antigravity-chat-auth-config
 import type { EmulatorOpeningSettings } from './emulator-opening-preferences'
 import type { BrowserExtensionGlobalSettings } from './browser/extensions/browser-extension-settings'
 import type { ClaudeAgentViewSettings } from './claude-agent-view'
+import type { WorktreeCardDisplaySettings } from './worktree/card-display-settings-types'
 import type { BrowserLinkOpeningSettings } from './browser-link-opening-settings'
 import type { BrowserPasswordsGlobalSettings } from './browser-passwords-types'
 import type { ClaudeAccountSwitchSettings } from './claude-account-switch-settings'
@@ -33,6 +34,7 @@ export type GlobalSettingsBase = AntigravityChatAuthSettings &
   NativeChatGlobalSettings &
   NativeChatIdleStopSettings &
   WorktreeDeletionPreferences &
+  WorktreeCardDisplaySettings &
   ClaudeAccountSwitchSettings &
   AgentPermissionGlobalSettings &
   ExternalConversationSettings &
diff --git a/src/shared/global-settings-types.ts b/src/shared/global-settings-types.ts
index 2b69e4794dd..85f4a02b995 100644
--- a/src/shared/global-settings-types.ts
+++ b/src/shared/global-settings-types.ts
@@ -473,8 +473,6 @@ export type GlobalSettings = GlobalSettingsBase & {
   experimentalNewWorktreeCardStyle?: boolean
   /** Plugin frames as isolated guests (default on); main-only kill switch, see plugin-frame-isolation.ts. */
   experimentalPluginIsolatedFrames?: boolean
-  /** Which worktree card the sidebar draws; `experimentalNewWorktreeCardStyle` stays in step for older clients. */
-  worktreeCardStyle?: 'classic' | 'experimental-1' | 'experimental-2'
   /** Experimental: per-workspace on-demand environment recipes and setup surface. */
   experimentalEphemeralVms?: boolean
   /** Experimental (Windows): add WSL distros as hosts, each running its own Orca server. */
diff --git a/src/shared/sidebar-list/row-types.ts b/src/shared/sidebar-list/row-types.ts
index 8c993a5c32f..5627c5ab6b2 100644
--- a/src/shared/sidebar-list/row-types.ts
+++ b/src/shared/sidebar-list/row-types.ts
@@ -65,8 +65,8 @@ export type WorktreeRow = {
   lineageChildWorktreeIds?: readonly string[]
   lineageGroupKey?: string
   lineageCollapsed?: boolean
-  /** Set only while collapsed: every workspace folded under this one. */
-  lineageHiddenDescendantIds?: readonly string[]
+  /** Every workspace nested under this one, collapsed or not. */
+  lineageDescendantIds?: readonly string[]
   hostContextLabel?: string
   showProjectName?: boolean
 }
diff --git a/src/shared/sidebar-list/sections/row-builders.ts b/src/shared/sidebar-list/sections/row-builders.ts
index 0a68371047e..410e3a3dded 100644
--- a/src/shared/sidebar-list/sections/row-builders.ts
+++ b/src/shared/sidebar-list/sections/row-builders.ts
@@ -65,7 +65,7 @@ export function buildNewExternalWorktreesInboxRow(
   }
 }
 
-function hiddenDescendantIds(
+function descendantIds(
   occurrences: readonly WorktreeOccurrence<Worktree>[],
   parent: WorktreeOccurrence<Worktree>
 ): string[] {
@@ -142,11 +142,7 @@ export function appendWorktreeRows(
         ? {
             lineageGroupKey: getWorktreeLineageGroupKey(worktree),
             lineageCollapsed: options.collapsedGroups.has(getWorktreeLineageGroupKey(worktree)),
-            ...(options.collapsedGroups.has(getWorktreeLineageGroupKey(worktree))
-              ? {
-                  lineageHiddenDescendantIds: hiddenDescendantIds(sectionOccurrences, occurrence)
-                }
-              : {})
+            lineageDescendantIds: descendantIds(sectionOccurrences, occurrence)
           }
         : {})
     })
diff --git a/src/shared/worktree/card-display-settings-types.ts b/src/shared/worktree/card-display-settings-types.ts
new file mode 100644
index 00000000000..a656566b24a
--- /dev/null
+++ b/src/shared/worktree/card-display-settings-types.ts
@@ -0,0 +1,6 @@
+export type WorktreeCardDisplaySettings = {
+  /** Which worktree card the sidebar draws; `experimentalNewWorktreeCardStyle` stays in step for older clients. */
+  worktreeCardStyle?: 'classic' | 'experimental-1' | 'experimental-2'
+  /** 2.0 card: draw the details row (Card display items) under each name; off by default. */
+  worktreeCardDetailsRow?: boolean
+}