diff --git a/desktop/src/components/layout/Sidebar.test.tsx b/desktop/src/components/layout/Sidebar.test.tsx
index 06c6e454..e6e41dbf 100644
--- a/desktop/src/components/layout/Sidebar.test.tsx
+++ b/desktop/src/components/layout/Sidebar.test.tsx
@@ -64,6 +64,7 @@ vi.mock('../../i18n', () => ({
       'sidebar.expandProject': 'Expand {project}',
       'sidebar.collapseProject': 'Collapse {project}',
       'sidebar.worktree': 'worktree',
+      'sidebar.sessionRunning': 'Session running',
       'common.retry': 'Retry',
       'common.loading': 'Loading...',
       'common.cancel': 'Cancel',
@@ -90,6 +91,11 @@ vi.mock('../../i18n', () => ({
       'sidebar.batchDeleteFailed': '{count} sessions could not be deleted.',
       'sidebar.collapse': 'Collapse sidebar',
       'sidebar.expand': 'Expand sidebar',
+      'session.lastUpdated': 'last updated {time}',
+      'session.timeJustNow': 'just now',
+      'session.timeMinutes': '{n}m ago',
+      'session.timeHours': '{n}h ago',
+      'session.timeDays': '{n}d ago',
     }
 
     let text = translations[key] ?? key
@@ -776,6 +782,39 @@ describe('Sidebar', () => {
     expect(screen.getAllByText('worktree')).toHaveLength(1)
   })
 
+  it('right-aligns running status, worktree marker, and update time on session rows', () => {
+    vi.useFakeTimers()
+    vi.setSystemTime(new Date('2026-05-19T12:00:00.000Z'))
+
+    useSessionStore.setState({
+      sessions: [
+        {
+          ...makeSession('running-worktree', 'Running Worktree', '/workspace/repo/.claude/worktrees/desktop-main-12345678', '2026-05-19T07:00:00.000Z'),
+          projectRoot: '/workspace/repo',
+        },
+        makeSession('idle-source', 'Idle Source', '/workspace/repo', '2026-05-19T11:40:00.000Z'),
+      ],
+    })
+    useTabStore.setState({
+      tabs: [
+        { sessionId: 'running-worktree', title: 'Running Worktree', type: 'session', status: 'running' },
+        { sessionId: 'idle-source', title: 'Idle Source', type: 'session', status: 'idle' },
+      ],
+      activeTabId: 'running-worktree',
+    })
+
+    render(<Sidebar />)
+
+    const runningRow = screen.getByRole('button', { name: /Running Worktree/ })
+    expect(within(runningRow).getByLabelText('Session running')).toBeInTheDocument()
+    expect(within(runningRow).getByText('worktree')).toHaveClass('sr-only')
+    expect(within(runningRow).getByText('5h ago')).toBeInTheDocument()
+
+    const idleRow = screen.getByRole('button', { name: /Idle Source/ })
+    expect(within(idleRow).queryByLabelText('Session running')).not.toBeInTheDocument()
+    expect(within(idleRow).getByText('20m ago')).toBeInTheDocument()
+  })
+
   it('shows a toast when session creation fails', async () => {
     createSession.mockRejectedValue(new Error('boom'))
 
diff --git a/desktop/src/components/layout/Sidebar.tsx b/desktop/src/components/layout/Sidebar.tsx
index 8ac7685c..9860caeb 100644
--- a/desktop/src/components/layout/Sidebar.tsx
+++ b/desktop/src/components/layout/Sidebar.tsx
@@ -1,8 +1,8 @@
 import { useEffect, useState, useCallback, useMemo, useRef } from 'react'
-import { Check, ChevronDown, Clock, Folder, FolderOpen, FolderPlus, MoreHorizontal, Pin, PinOff, RefreshCw, RotateCcw, SquarePen, X } from 'lucide-react'
+import { Check, ChevronDown, Clock, Folder, FolderOpen, FolderPlus, GitBranch, LoaderCircle, MoreHorizontal, Pin, PinOff, RefreshCw, RotateCcw, SquarePen, X } from 'lucide-react'
 import { useSessionStore } from '../../stores/sessionStore'
 import { useUIStore } from '../../stores/uiStore'
-import { useTranslation } from '../../i18n'
+import { useTranslation, type TranslationKey } from '../../i18n'
 import { ConfirmDialog } from '../shared/ConfirmDialog'
 import type { SessionListItem } from '../../types/session'
 import { useTabStore, SETTINGS_TAB_ID, SCHEDULED_TAB_ID } from '../../stores/tabStore'
@@ -59,6 +59,8 @@ export function Sidebar({ isMobile = false, onRequestClose }: SidebarProps) {
   const sidebarOpen = useUIStore((s) => s.sidebarOpen)
   const toggleSidebar = useUIStore((s) => s.toggleSidebar)
   const activeTabId = useTabStore((s) => s.activeTabId)
+  const tabs = useTabStore((s) => s.tabs)
+  const chatSessions = useChatStore((s) => s.sessions)
   const closeTab = useTabStore((s) => s.closeTab)
   const disconnectSession = useChatStore((s) => s.disconnectSession)
   const [searchQuery, setSearchQuery] = useState('')
@@ -130,6 +132,16 @@ export function Sidebar({ isMobile = false, onRequestClose }: SidebarProps) {
     () => new Map(sessions.map((session) => [session.id, session])),
     [sessions],
   )
+  const runningSessionIds = useMemo(() => {
+    const ids = new Set<string>()
+    for (const tab of tabs) {
+      if (tab.type === 'session' && tab.status === 'running') ids.add(tab.sessionId)
+    }
+    for (const [sessionId, sessionState] of Object.entries(chatSessions)) {
+      if (sessionState.chatState !== 'idle') ids.add(sessionId)
+    }
+    return ids
+  }, [chatSessions, tabs])
   const pendingBatchDeleteSessions = useMemo(
     () => (pendingBatchDeleteSessionIds ?? [])
       .map((sessionId) => sessionsById.get(sessionId))
@@ -986,14 +998,12 @@ export function Sidebar({ isMobile = false, onRequestClose }: SidebarProps) {
                                         {t('sidebar.missingDir')}
                                       </span>
                                     )}
-                                    {isWorktreeSession(session) && (
-                                      <span className="flex-shrink-0 rounded bg-[var(--color-sidebar-item-hover)] px-1 py-0.5 text-[9px] font-medium uppercase tracking-wide text-[var(--color-text-tertiary)]">
-                                        {t('sidebar.worktree')}
-                                      </span>
-                                    )}
-                                    <span className="flex-shrink-0 text-[10px] text-[var(--color-text-tertiary)] opacity-0 transition-opacity group-hover/session:opacity-100">
-                                      {formatRelativeTime(session.modifiedAt)}
-                                    </span>
+                                    <SessionRowMeta
+                                      isRunning={runningSessionIds.has(session.id)}
+                                      isWorktree={isWorktreeSession(session)}
+                                      modifiedAt={session.modifiedAt}
+                                      t={t}
+                                    />
                                   </span>
                                 </button>
                               )}
@@ -1793,6 +1803,50 @@ function ProjectMenuItem({
   )
 }
 
+function SessionRowMeta({
+  isRunning,
+  isWorktree,
+  modifiedAt,
+  t,
+}: {
+  isRunning: boolean
+  isWorktree: boolean
+  modifiedAt: string
+  t: (key: TranslationKey, params?: Record<string, string | number>) => string
+}) {
+  const relativeTime = formatRelativeTime(modifiedAt, t)
+  const updatedLabel = t('session.lastUpdated', { time: relativeTime })
+
+  return (
+    <span
+      className="ml-auto flex h-5 min-w-[78px] flex-shrink-0 items-center justify-end gap-1.5 text-[10px] font-medium tabular-nums text-[var(--color-text-tertiary)]"
+      title={updatedLabel}
+    >
+      {isRunning && (
+        <span
+          className="inline-flex h-4 w-4 flex-shrink-0 items-center justify-center text-[var(--color-success)]"
+          aria-label={t('sidebar.sessionRunning')}
+          title={t('sidebar.sessionRunning')}
+        >
+          <LoaderCircle className="h-3.5 w-3.5 animate-spin" strokeWidth={2.2} aria-hidden="true" />
+        </span>
+      )}
+      {isWorktree && (
+        <span
+          className="inline-flex h-4 w-4 flex-shrink-0 items-center justify-center rounded-[5px] text-[var(--color-text-tertiary)]"
+          title={t('sidebar.worktree')}
+        >
+          <GitBranch className="h-3.5 w-3.5" strokeWidth={2} aria-hidden="true" />
+          <span className="sr-only">{t('sidebar.worktree')}</span>
+        </span>
+      )}
+      <span className="inline-flex min-w-[42px] flex-shrink-0 items-center justify-end">
+        <span>{relativeTime}</span>
+      </span>
+    </span>
+  )
+}
+
 function NavItem({
   active,
   collapsed,
@@ -1834,16 +1888,23 @@ function NavItem({
   )
 }
 
-function formatRelativeTime(dateStr: string): string {
-  const diff = Date.now() - new Date(dateStr).getTime()
+function formatRelativeTime(
+  dateStr: string,
+  t: (key: TranslationKey, params?: Record<string, string | number>) => string,
+): string {
+  const date = new Date(dateStr)
+  const timestamp = date.getTime()
+  if (!Number.isFinite(timestamp)) return ''
+
+  const diff = Date.now() - timestamp
   const min = Math.floor(diff / 60000)
-  if (min < 1) return 'now'
-  if (min < 60) return `${min}m`
+  if (min < 1) return t('session.timeJustNow')
+  if (min < 60) return t('session.timeMinutes', { n: min })
   const hr = Math.floor(min / 60)
-  if (hr < 24) return `${hr}h`
+  if (hr < 24) return t('session.timeHours', { n: hr })
   const day = Math.floor(hr / 24)
-  if (day < 30) return `${day}d`
-  return `${Math.floor(day / 30)}mo`
+  if (day < 30) return t('session.timeDays', { n: day })
+  return new Intl.DateTimeFormat(undefined, { month: 'numeric', day: 'numeric' }).format(date)
 }
 
 function GitHubIcon() {
diff --git a/desktop/src/components/layout/TabBar.test.tsx b/desktop/src/components/layout/TabBar.test.tsx
index 584edefe..4512cb6b 100644
--- a/desktop/src/components/layout/TabBar.test.tsx
+++ b/desktop/src/components/layout/TabBar.test.tsx
@@ -60,6 +60,7 @@ vi.mock('../../i18n', () => ({
       'tabs.closeAllConfirmTitle': 'Sessions Running',
       'tabs.closeAllConfirmMessage': '{count} sessions still running',
       'tabs.closeAllConfirmStop': 'Stop All & Close',
+      'tabs.sessionRunning': 'Session running',
       'tabs.openTerminal': 'Open Terminal',
       'tabs.showWorkspace': 'Show Workspace',
       'tabs.hideWorkspace': 'Hide Workspace',
@@ -834,4 +835,34 @@ describe('TabBar', () => {
     expect(disconnectSession).toHaveBeenCalledWith('tab-idle')
     expect(useTabStore.getState().tabs).toEqual([])
   })
+
+  it('shows a running marker on tabs from tab status or live chat state', async () => {
+    const { TabBar } = await import('./TabBar')
+    const { useTabStore } = await import('../../stores/tabStore')
+    const { useChatStore } = await import('../../stores/chatStore')
+
+    useTabStore.setState({
+      tabs: [
+        { sessionId: 'tab-status-running', title: 'Status Running', type: 'session', status: 'running' },
+        { sessionId: 'tab-chat-running', title: 'Chat Running', type: 'session', status: 'idle' },
+        { sessionId: 'tab-idle', title: 'Idle', type: 'session', status: 'idle' },
+      ],
+      activeTabId: 'tab-status-running',
+    })
+    useChatStore.setState({
+      sessions: {
+        'tab-status-running': makeChatSession('idle'),
+        'tab-chat-running': makeChatSession('thinking'),
+        'tab-idle': makeChatSession('idle'),
+      },
+      disconnectSession: vi.fn(),
+    } as Partial<ReturnType<typeof useChatStore.getState>>)
+
+    await act(async () => {
+      render(<TabBar />)
+    })
+
+    expect(screen.getAllByLabelText('Session running')).toHaveLength(2)
+    expect(screen.getByText('Idle').closest('[data-dragging]')?.querySelector('[aria-label="Session running"]')).toBeNull()
+  })
 })
diff --git a/desktop/src/components/layout/TabBar.tsx b/desktop/src/components/layout/TabBar.tsx
index b4a4ca2a..25495157 100644
--- a/desktop/src/components/layout/TabBar.tsx
+++ b/desktop/src/components/layout/TabBar.tsx
@@ -1,4 +1,4 @@
-import { forwardRef, useRef, useState, useEffect, useCallback } from 'react'
+import { forwardRef, useMemo, useRef, useState, useEffect, useCallback } from 'react'
 import {
   SCHEDULED_TAB_ID,
   SETTINGS_TAB_ID,
@@ -44,6 +44,7 @@ export function TabBar() {
   const activeTabId = useTabStore((s) => s.activeTabId)
   const setActiveTab = useTabStore((s) => s.setActiveTab)
   const closeTab = useTabStore((s) => s.closeTab)
+  const chatSessions = useChatStore((s) => s.sessions)
   const disconnectSession = useChatStore((s) => s.disconnectSession)
   const activeTab = tabs.find((tab) => tab.sessionId === activeTabId) ?? null
   const isActiveSessionTab = isSessionTab(activeTab) || isSessionTabId(activeTabId)
@@ -75,6 +76,16 @@ export function TabBar() {
   const tabRefs = useRef(new Map<string, HTMLDivElement | null>())
   const startDraggingRef = useRef<(() => Promise<void>) | null>(null)
   const t = useTranslation()
+  const runningSessionIds = useMemo(() => {
+    const ids = new Set<string>()
+    for (const tab of tabs) {
+      if (isSessionTab(tab) && tab.status === 'running') ids.add(tab.sessionId)
+    }
+    for (const [sessionId, sessionState] of Object.entries(chatSessions)) {
+      if (sessionState.chatState !== 'idle') ids.add(sessionId)
+    }
+    return ids
+  }, [chatSessions, tabs])
 
   useEffect(() => {
     if (!isTauri) return
@@ -332,10 +343,12 @@ export function TabBar() {
             key={tab.sessionId}
             ref={(node) => { tabRefs.current.set(tab.sessionId, node) }}
             tab={tab}
+            isRunning={runningSessionIds.has(tab.sessionId)}
             isActive={tab.sessionId === activeTabId}
             isDragOver={dragOverIndex === index}
             isDragging={tab.sessionId === draggingSessionId}
             dragOffsetX={tab.sessionId === draggingSessionId ? dragOffsetX : 0}
+            runningLabel={t('tabs.sessionRunning')}
             onClick={() => handleTabClick(tab.sessionId)}
             onClose={() => handleClose(tab.sessionId)}
             onContextMenu={(e) => handleContextMenu(e, tab.sessionId)}
@@ -473,15 +486,17 @@ export function TabBar() {
 
 const TabItem = forwardRef<HTMLDivElement, {
   tab: Tab
+  isRunning: boolean
   isActive: boolean
   isDragOver: boolean
   isDragging: boolean
   dragOffsetX: number
+  runningLabel: string
   onClick: () => void
   onClose: () => void
   onContextMenu: (e: React.MouseEvent) => void
   onMouseDown: (event: React.MouseEvent) => void
-}>(({ tab, isActive, isDragOver, isDragging, dragOffsetX, onClick, onClose, onContextMenu, onMouseDown }, ref) => {
+}>(({ tab, isRunning, isActive, isDragOver, isDragging, dragOffsetX, runningLabel, onClick, onClose, onContextMenu, onMouseDown }, ref) => {
   return (
     <div
       ref={ref}
@@ -506,8 +521,12 @@ const TabItem = forwardRef<HTMLDivElement, {
         transform: isDragging ? `translateX(${dragOffsetX}px) scale(1.02)` : undefined,
       }}
     >
-      {tab.type === 'session' && tab.status === 'running' && (
-        <span className="w-1.5 h-1.5 rounded-full bg-[var(--color-success)] animate-pulse flex-shrink-0" />
+      {tab.type === 'session' && isRunning && (
+        <span
+          className="h-1.5 w-1.5 flex-shrink-0 rounded-full bg-[var(--color-success)] animate-pulse"
+          aria-label={runningLabel}
+          title={runningLabel}
+        />
       )}
       {tab.type === 'session' && tab.status === 'error' && (
         <span className="w-1.5 h-1.5 rounded-full bg-[var(--color-error)] flex-shrink-0" />
diff --git a/desktop/src/i18n/locales/en.ts b/desktop/src/i18n/locales/en.ts
index f31d0b6d..43466957 100644
--- a/desktop/src/i18n/locales/en.ts
+++ b/desktop/src/i18n/locales/en.ts
@@ -56,6 +56,7 @@ export const en = {
   'sidebar.expandProject': 'Expand {project}',
   'sidebar.collapseProject': 'Collapse {project}',
   'sidebar.worktree': 'worktree',
+  'sidebar.sessionRunning': 'Session running',
   'sidebar.missingDir': 'missing dir',
   'sidebar.confirmDelete': 'Delete this session? This cannot be undone.',
   'sidebar.batchManage': 'Batch manage',
@@ -1509,6 +1510,7 @@ export const en = {
   'tabs.closeAllConfirmTitle': 'Sessions Running',
   'tabs.closeAllConfirmMessage': '{count} sessions are still running. Stop them before closing these tabs?',
   'tabs.closeAllConfirmStop': 'Stop All & Close',
+  'tabs.sessionRunning': 'Session running',
   'tabs.openTerminal': 'Open Terminal',
   'tabs.showWorkspace': 'Show Workspace',
   'tabs.hideWorkspace': 'Hide Workspace',
diff --git a/desktop/src/i18n/locales/zh.ts b/desktop/src/i18n/locales/zh.ts
index 350509b0..db472bb9 100644
--- a/desktop/src/i18n/locales/zh.ts
+++ b/desktop/src/i18n/locales/zh.ts
@@ -58,6 +58,7 @@ export const zh: Record<TranslationKey, string> = {
   'sidebar.expandProject': '展开 {project}',
   'sidebar.collapseProject': '折叠 {project}',
   'sidebar.worktree': 'worktree',
+  'sidebar.sessionRunning': '会话运行中',
   'sidebar.missingDir': '目录缺失',
   'sidebar.confirmDelete': '确定要删除这个会话吗？此操作不可撤销。',
   'sidebar.batchManage': '批量管理',
@@ -1511,6 +1512,7 @@ export const zh: Record<TranslationKey, string> = {
   'tabs.closeAllConfirmTitle': '多个会话运行中',
   'tabs.closeAllConfirmMessage': '仍有 {count} 个会话正在运行。关闭这些标签前是否停止它们？',
   'tabs.closeAllConfirmStop': '全部停止并关闭',
+  'tabs.sessionRunning': '会话运行中',
   'tabs.openTerminal': '打开终端',
   'tabs.showWorkspace': '显示工作区',
   'tabs.hideWorkspace': '隐藏工作区',