diff --git a/apps/desktop/src/app/chat/sidebar/index.tsx b/apps/desktop/src/app/chat/sidebar/index.tsx
index 03b65d51f5cc..fc58cb198779 100644
--- a/apps/desktop/src/app/chat/sidebar/index.tsx
+++ b/apps/desktop/src/app/chat/sidebar/index.tsx
@@ -22,6 +22,14 @@ import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { PlatformAvatar } from '@/app/messaging/platform-icon'
 import { Button } from '@/components/ui/button'
 import { Codicon } from '@/components/ui/codicon'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle
+} from '@/components/ui/dialog'
 import { DisclosureCaret } from '@/components/ui/disclosure-caret'
 import { KbdGroup } from '@/components/ui/kbd'
 import { SearchField } from '@/components/ui/search-field'
@@ -278,6 +286,7 @@ interface ChatSidebarProps extends React.ComponentProps<typeof Sidebar> {
   onResumeSession: (sessionId: string) => void
   onDeleteSession: (sessionId: string) => void
   onArchiveSession: (sessionId: string) => void
+  onArchiveAllSessions: () => Promise<void> | void
   onNewSessionInWorkspace: (path: null | string) => void
   onManageCronJob: (jobId: string) => void
   onTriggerCronJob: (jobId: string) => void
@@ -292,6 +301,7 @@ export function ChatSidebar({
   onResumeSession,
   onDeleteSession,
   onArchiveSession,
+  onArchiveAllSessions,
   onNewSessionInWorkspace,
   onManageCronJob,
   onTriggerCronJob
@@ -313,6 +323,8 @@ export function ChatSidebar({
   const cronSessions = useStore($cronSessions)
   const cronJobs = useStore($cronJobs)
   const [remoteOpen, setRemoteOpen] = useState(true)
+  const [archiveAllOpen, setArchiveAllOpen] = useState(false)
+  const [archiveAllSubmitting, setArchiveAllSubmitting] = useState(false)
   const messagingSessions = useStore($messagingSessions)
   const messagingPlatformTotals = useStore($messagingPlatformTotals)
   const messagingTruncated = useStore($messagingTruncated)
@@ -649,6 +661,24 @@ export function ChatSidebar({
   const remainingSessionCount = Math.max(0, knownSessionTotal - loadedSessionCount)
 
   const recentsMeta = countLabel(agentSessions.length, knownSessionTotal)
+  const archiveAllDisabled = sessionsLoading || agentSessions.length === 0 || archiveAllSubmitting
+
+  const handleArchiveAll = async () => {
+    if (archiveAllSubmitting) {
+      return
+    }
+
+    setArchiveAllSubmitting(true)
+
+    try {
+      await onArchiveAllSessions()
+      setArchiveAllOpen(false)
+    } catch {
+      // The caller owns the error toast/rollback; keep the dialog open.
+    } finally {
+      setArchiveAllSubmitting(false)
+    }
+  }
 
   const displayAgentGroups = showAllProfiles ? profileGroups : agentsGrouped ? agentGroups : undefined
 
@@ -886,33 +916,64 @@ export function ChatSidebar({
             forceEmptyState={showSessionSkeletons}
             groups={displayAgentGroups}
             headerAction={
-              // Always reserve the icon-xs (size-6) slot so the header keeps the
-              // same height whether or not the toggle renders — otherwise the
-              // "Sessions" label jumps when switching to the ALL-profiles view.
-              // Grouping operates on unpinned recents; if everything is pinned
-              // the toggle does nothing, and it's irrelevant in the ALL-profiles
-              // view (always grouped by profile), so hide the button (not the slot).
-              <div className="grid size-6 shrink-0 place-items-center">
-                {!showAllProfiles && agentSessions.length > 0 ? (
-                  <Tip label={agentsGrouped ? s.groupTitleGrouped : s.groupTitleUngrouped}>
-                    <Button
-                      aria-label={agentsGrouped ? s.groupAriaGrouped : s.groupAriaUngrouped}
-                      className={cn(
-                        'text-(--ui-text-tertiary) opacity-70 hover:bg-(--ui-control-hover-background) hover:text-foreground hover:opacity-100 focus-visible:opacity-100',
-                        agentsGrouped && 'bg-(--ui-control-active-background) text-foreground opacity-100'
-                      )}
-                      onClick={event => {
-                        event.stopPropagation()
-                        setSidebarRecentsOpen(true)
-                        setSidebarAgentsGrouped(!agentsGrouped)
-                      }}
-                      size="icon-xs"
-                      variant="ghost"
-                    >
-                      <Codicon name={agentsGrouped ? 'list-unordered' : 'root-folder'} size="0.75rem" />
-                    </Button>
-                  </Tip>
-                ) : null}
+              // Two right-aligned header actions sharing one flex row so they
+              // stay vertically centered with the "Sessions N/M" label (the
+              // header is items-center justify-between). Each lives in a fixed
+              // size-6 slot so the row height — and the label baseline — never
+              // shifts as buttons show/hide across views.
+              <div className="flex items-center gap-0.5">
+                <div className="grid size-6 shrink-0 place-items-center">
+                  {!showAllProfiles && agentSessions.length > 0 ? (
+                    <Tip label={s.archiveAllTitle}>
+                      <Button
+                        aria-label={s.archiveAllAria}
+                        className="text-(--ui-text-tertiary) opacity-70 hover:bg-(--ui-control-hover-background) hover:text-foreground hover:opacity-100 focus-visible:opacity-100"
+                        disabled={archiveAllDisabled}
+                        onClick={event => {
+                          event.stopPropagation()
+                          setSidebarRecentsOpen(true)
+                          setArchiveAllOpen(true)
+                        }}
+                        size="icon-xs"
+                        variant="ghost"
+                      >
+                        <Codicon
+                          name={archiveAllSubmitting ? 'loading' : 'archive'}
+                          size="0.75rem"
+                          spinning={archiveAllSubmitting}
+                        />
+                      </Button>
+                    </Tip>
+                  ) : null}
+                </div>
+                {/* Always reserve the icon-xs (size-6) slot so the header keeps the
+                    same height whether or not the toggle renders — otherwise the
+                    "Sessions" label jumps when switching to the ALL-profiles view.
+                    Grouping operates on unpinned recents; if everything is pinned
+                    the toggle does nothing, and it's irrelevant in the ALL-profiles
+                    view (always grouped by profile), so hide the button (not the slot). */}
+                <div className="grid size-6 shrink-0 place-items-center">
+                  {!showAllProfiles && agentSessions.length > 0 ? (
+                    <Tip label={agentsGrouped ? s.groupTitleGrouped : s.groupTitleUngrouped}>
+                      <Button
+                        aria-label={agentsGrouped ? s.groupAriaGrouped : s.groupAriaUngrouped}
+                        className={cn(
+                          'text-(--ui-text-tertiary) opacity-70 hover:bg-(--ui-control-hover-background) hover:text-foreground hover:opacity-100 focus-visible:opacity-100',
+                          agentsGrouped && 'bg-(--ui-control-active-background) text-foreground opacity-100'
+                        )}
+                        onClick={event => {
+                          event.stopPropagation()
+                          setSidebarRecentsOpen(true)
+                          setSidebarAgentsGrouped(!agentsGrouped)
+                        }}
+                        size="icon-xs"
+                        variant="ghost"
+                      >
+                        <Codicon name={agentsGrouped ? 'list-unordered' : 'root-folder'} size="0.75rem" />
+                      </Button>
+                    </Tip>
+                  ) : null}
+                </div>
               </div>
             }
             label={s.sessions}
@@ -1002,10 +1063,52 @@ export function ChatSidebar({
           </div>
         )}
       </SidebarContent>
+      <ArchiveAllSessionsDialog
+        count={knownSessionTotal}
+        onConfirm={handleArchiveAll}
+        onOpenChange={setArchiveAllOpen}
+        open={archiveAllOpen}
+        submitting={archiveAllSubmitting}
+      />
     </Sidebar>
   )
 }
 
+interface ArchiveAllSessionsDialogProps {
+  count: number
+  open: boolean
+  onConfirm: () => void | Promise<void>
+  onOpenChange: (open: boolean) => void
+  submitting: boolean
+}
+
+function ArchiveAllSessionsDialog({ count, open, onConfirm, onOpenChange, submitting }: ArchiveAllSessionsDialogProps) {
+  const { t } = useI18n()
+  const s = t.sidebar
+
+  return (
+    <Dialog onOpenChange={onOpenChange} open={open}>
+      <DialogContent className="max-w-md">
+        <DialogHeader>
+          <DialogTitle>{s.archiveAllDialogTitle}</DialogTitle>
+          <DialogDescription>{s.archiveAllDialogDesc}</DialogDescription>
+        </DialogHeader>
+        <div className="rounded-md border border-(--ui-stroke-tertiary) bg-(--ui-control-background) px-3 py-2 text-xs text-(--ui-text-secondary)">
+          {count > 0 ? s.archiveAllChecked(count) : s.archiveAllNone}
+        </div>
+        <DialogFooter>
+          <Button disabled={submitting} onClick={() => onOpenChange(false)} type="button" variant="ghost">
+            {s.archiveAllCancel}
+          </Button>
+          <Button disabled={submitting} onClick={() => void onConfirm()} type="button" variant="destructive">
+            {submitting ? s.archiveAllSubmitting : s.archiveAllConfirm}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
 interface SidebarSectionHeaderProps {
   label: string
   open: boolean
diff --git a/apps/desktop/src/app/desktop-controller.tsx b/apps/desktop/src/app/desktop-controller.tsx
index 92d0a1c3aa16..ea0868455176 100644
--- a/apps/desktop/src/app/desktop-controller.tsx
+++ b/apps/desktop/src/app/desktop-controller.tsx
@@ -632,6 +632,7 @@ export function DesktopController() {
   const sidebar = (
     <ChatSidebar
       currentView={currentView}
+      onArchiveAllSessions={() => archiveAllSessions().then(() => refreshSessions())}
       onArchiveSession={sessionId => void archiveSession(sessionId)}
       onDeleteSession={sessionId => void removeSession(sessionId)}
       onLoadMoreProfileSessions={loadMoreSessionsForProfile}
diff --git a/apps/desktop/src/i18n/en.ts b/apps/desktop/src/i18n/en.ts
index 62db6101da1a..c7aef2b4c6a1 100644
--- a/apps/desktop/src/i18n/en.ts
+++ b/apps/desktop/src/i18n/en.ts
@@ -1070,6 +1070,16 @@ export const en: Translations = {
     groupAriaUngrouped: 'Group sessions by workspace',
     groupTitleGrouped: 'Ungroup sessions',
     groupTitleUngrouped: 'Group by workspace',
+    archiveAllTitle: 'Archive all sessions',
+    archiveAllAria: 'Archive all unpinned sessions',
+    archiveAllDialogTitle: 'Archive all sessions',
+    archiveAllDialogDesc:
+      'Archive unpinned sessions from the sidebar. Pinned chats, the current chat, and running sessions stay visible.',
+    archiveAllConfirm: 'Archive all',
+    archiveAllCancel: 'Cancel',
+    archiveAllSubmitting: 'Archiving...',
+    archiveAllChecked: count => `${count} visible session${count === 1 ? '' : 's'} will be checked.`,
+    archiveAllNone: 'No sessions to archive.',
     allPinned: 'Everything here is pinned. Unpin a chat to show it in recents.',
     shiftClickHint: 'Shift-click a chat to pin',
     noWorkspace: 'No workspace',
diff --git a/apps/desktop/src/i18n/ja.ts b/apps/desktop/src/i18n/ja.ts
index f19a38b07f5d..dc0b13f6f941 100644
--- a/apps/desktop/src/i18n/ja.ts
+++ b/apps/desktop/src/i18n/ja.ts
@@ -1155,6 +1155,15 @@ export const ja = defineLocale({
     groupAriaUngrouped: 'ワークスペースごとにセッションをグループ化',
     groupTitleGrouped: 'セッションのグループ化を解除',
     groupTitleUngrouped: 'ワークスペースでグループ化',
+    archiveAllTitle: 'すべてのセッションをアーカイブ',
+    archiveAllAria: '固定されていないすべてのセッションをアーカイブ',
+    archiveAllDialogTitle: 'すべてのセッションをアーカイブ',
+    archiveAllDialogDesc: 'サイドバーから固定されていないセッションをアーカイブします。固定中のチャット、現在のチャット、実行中のセッションは表示されたままです。',
+    archiveAllConfirm: 'すべてアーカイブ',
+    archiveAllCancel: 'キャンセル',
+    archiveAllSubmitting: 'アーカイブ中…',
+    archiveAllChecked: count => `表示中の ${count} 件のセッションが対象になります。`,
+    archiveAllNone: 'アーカイブするセッションはありません。',
     allPinned: 'ここにあるものはすべてピン留めされています。チャットのピン留めを解除すると最近のものに表示されます。',
     shiftClickHint: 'Shift クリックでピン留め · ドラッグで並べ替え',
     noWorkspace: 'ワークスペースなし',
diff --git a/apps/desktop/src/i18n/types.ts b/apps/desktop/src/i18n/types.ts
index fc60522cf1f6..70ad52393bcd 100644
--- a/apps/desktop/src/i18n/types.ts
+++ b/apps/desktop/src/i18n/types.ts
@@ -823,6 +823,15 @@ export interface Translations {
     groupAriaUngrouped: string
     groupTitleGrouped: string
     groupTitleUngrouped: string
+    archiveAllTitle: string
+    archiveAllAria: string
+    archiveAllDialogTitle: string
+    archiveAllDialogDesc: string
+    archiveAllConfirm: string
+    archiveAllCancel: string
+    archiveAllSubmitting: string
+    archiveAllChecked: (count: number) => string
+    archiveAllNone: string
     allPinned: string
     shiftClickHint: string
     noWorkspace: string
diff --git a/apps/desktop/src/i18n/zh-hant.ts b/apps/desktop/src/i18n/zh-hant.ts
index e566365faad1..c1e04eaa3689 100644
--- a/apps/desktop/src/i18n/zh-hant.ts
+++ b/apps/desktop/src/i18n/zh-hant.ts
@@ -1121,6 +1121,15 @@ export const zhHant = defineLocale({
     groupAriaUngrouped: '依工作區分組工作階段',
     groupTitleGrouped: '取消分組',
     groupTitleUngrouped: '依工作區分組',
+    archiveAllTitle: '封存所有工作階段',
+    archiveAllAria: '封存所有未釘選的工作階段',
+    archiveAllDialogTitle: '封存所有工作階段',
+    archiveAllDialogDesc: '從側邊欄封存未釘選的工作階段。已釘選的對話、目前對話與執行中的工作階段仍會顯示。',
+    archiveAllConfirm: '全部封存',
+    archiveAllCancel: '取消',
+    archiveAllSubmitting: '封存中…',
+    archiveAllChecked: count => `將封存 ${count} 個顯示中的工作階段。`,
+    archiveAllNone: '沒有可封存的工作階段。',
     allPinned: '這裡的全部已釘選。取消釘選某個聊天即可在最近中顯示。',
     shiftClickHint: 'Shift + 點擊聊天以釘選 · 拖曳以重新排序',
     noWorkspace: '無工作區',
diff --git a/apps/desktop/src/i18n/zh.ts b/apps/desktop/src/i18n/zh.ts
index 09ac100abdc9..6b294f708b80 100644
--- a/apps/desktop/src/i18n/zh.ts
+++ b/apps/desktop/src/i18n/zh.ts
@@ -1217,6 +1217,15 @@ export const zh: Translations = {
     groupAriaUngrouped: '按工作区分组会话',
     groupTitleGrouped: '取消分组',
     groupTitleUngrouped: '按工作区分组',
+    archiveAllTitle: '归档所有会话',
+    archiveAllAria: '归档所有未置顶的会话',
+    archiveAllDialogTitle: '归档所有会话',
+    archiveAllDialogDesc: '从侧边栏归档未置顶的会话。已置顶的对话、当前对话和正在运行的会话仍会显示。',
+    archiveAllConfirm: '全部归档',
+    archiveAllCancel: '取消',
+    archiveAllSubmitting: '正在归档…',
+    archiveAllChecked: count => `将归档 ${count} 个可见会话。`,
+    archiveAllNone: '没有可归档的会话。',
     allPinned: '这里的全部已置顶。取消置顶某个对话即可在最近中显示。',
     shiftClickHint: 'Shift+ 单击对话以置顶 · 拖动以重新排序',
     noWorkspace: '无工作区',