diff --git a/packages/ui/src/components/session/SessionSidebar.tsx b/packages/ui/src/components/session/SessionSidebar.tsx
index d92659d8..acd52fad 100644
--- a/packages/ui/src/components/session/SessionSidebar.tsx
+++ b/packages/ui/src/components/session/SessionSidebar.tsx
@@ -827,6 +827,8 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
   const deleteSessions = useSessionUIStore((state) => state.deleteSessions);
   const archiveSession = useSessionUIStore((state) => state.archiveSession);
   const archiveSessions = useSessionUIStore((state) => state.archiveSessions);
+  const unarchiveSession = useSessionUIStore((state) => state.unarchiveSession);
+  const unarchiveSessions = useSessionUIStore((state) => state.unarchiveSessions);
 
   const {
     copiedSessionId,
@@ -839,6 +841,7 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
     handleCopySessionId,
     handleUnshareSession,
     handleDeleteSession,
+    handleRestoreSession,
     confirmDeleteSession,
   } = useSessionActions({
     mobileVariant,
@@ -858,6 +861,7 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
     deleteSessions,
     archiveSession,
     archiveSessions,
+    unarchiveSession,
     childrenMap,
     showDeletionDialog,
     setDeleteSessionConfirm,
@@ -916,6 +920,7 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
   const stableHandleCopySessionId = useStableRenderCallback(handleCopySessionId);
   const stableHandleUnshareSession = useStableRenderCallback(handleUnshareSession);
   const stableHandleDeleteSession = useStableRenderCallback(handleDeleteSession);
+  const stableHandleRestoreSession = useStableRenderCallback(handleRestoreSession);
   const stableCreateFolderAndStartRename = useStableRenderCallback(createFolderAndStartRename);
 
   const showMoreGroupSessions = React.useCallback((groupId: string, currentVisibleCount: number) => {
@@ -1579,6 +1584,7 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
         createFolderAndStartRename={stableCreateFolderAndStartRename}
         openContextPanelTab={openContextPanelTab}
         handleDeleteSession={stableHandleDeleteSession}
+        handleRestoreSession={stableHandleRestoreSession}
         mobileVariant={mobileVariant}
         alwaysShowActions={alwaysShowSidebarActions}
         renderSessionNode={renderSessionNode}
@@ -1752,6 +1758,7 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
     handleBulkCreateFolderAndMove,
     handleBulkRemoveFromFolder,
     handleBulkDelete,
+    handleBulkRestore,
     confirmBulkDelete,
   } = useSidebarBulkActions({
     isInlineEditing,
@@ -1762,6 +1769,7 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
     removeSessionsFromFolders,
     createFolderAndStartRename,
     archiveSessions,
+    unarchiveSessions,
     deleteSessions,
     setBulkDeleteConfirm,
   });
@@ -1909,6 +1917,7 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
           onCreateFolderAndMove={handleBulkCreateFolderAndMove}
           onRemoveFromFolder={handleBulkRemoveFromFolder}
           canRemoveFromFolder={bulkCanRemoveFromFolder}
+          onRestore={handleBulkRestore}
           onDelete={handleBulkDelete}
           onDone={handleExitSelectionMode}
         />
diff --git a/packages/ui/src/components/session/sidebar/BulkActionBar.tsx b/packages/ui/src/components/session/sidebar/BulkActionBar.tsx
index f42e3b82..d58e7034 100644
--- a/packages/ui/src/components/session/sidebar/BulkActionBar.tsx
+++ b/packages/ui/src/components/session/sidebar/BulkActionBar.tsx
@@ -21,6 +21,7 @@ type Props = {
   onCreateFolderAndMove: () => void;
   onRemoveFromFolder: () => void;
   canRemoveFromFolder: boolean;
+  onRestore: () => void;
   onDelete: () => void;
   onDone: () => void;
 };
@@ -34,6 +35,7 @@ export const BulkActionBar: React.FC<Props> = ({
   onCreateFolderAndMove,
   onRemoveFromFolder,
   canRemoveFromFolder,
+  onRestore,
   onDelete,
   onDone,
 }) => {
@@ -98,6 +100,22 @@ export const BulkActionBar: React.FC<Props> = ({
           </DropdownMenu>
         ) : null}
 
+        {archivedBucket ? (
+          <Tooltip>
+            <TooltipTrigger asChild>
+              <button
+                type="button"
+                onClick={onRestore}
+                className={iconButtonClass}
+                aria-label={t('sessions.sidebar.bulkActions.restore')}
+              >
+                <Icon name="inbox-unarchive" className="h-4 w-4" />
+              </button>
+            </TooltipTrigger>
+            <TooltipContent side="top" sideOffset={4}><p>{t('sessions.sidebar.bulkActions.restore')}</p></TooltipContent>
+          </Tooltip>
+        ) : null}
+
         <Tooltip>
           <TooltipTrigger asChild>
             <button
diff --git a/packages/ui/src/components/session/sidebar/DOCUMENTATION.md b/packages/ui/src/components/session/sidebar/DOCUMENTATION.md
index bbd99077..becce78f 100644
--- a/packages/ui/src/components/session/sidebar/DOCUMENTATION.md
+++ b/packages/ui/src/components/session/sidebar/DOCUMENTATION.md
@@ -8,7 +8,7 @@
 - When sticky zone headers are enabled, project headers are sticky "zone" bands (`SortableProjectItem`); on a vibrant desktop the scrolling content fades behind an unmasked, non-interactive copy of the stuck icon/title without painting a background. The transparent fade zone blocks interaction with obscured rows. The `recent` section uses the same overlay while it is the leading sticky header. Collapsed projects show an aggregated busy/unseen indicator (`ProjectAggregateStatusIndicator`), derived from the live status index and notification store scoped to the project's directories.
 - Session rows have a single layout (former `minimal`); the `default`/`minimal` display mode was removed (`session-display-mode` store v4 migration drops the key). Rows show an inline branch label (from `node.worktree` or recent's `secondaryMeta`) when the session lives outside the project root, and bold titles while unread.
 - Folders render **flat** after the loose sessions: nested folders keep `parentId` in the data model but display at one level with a "Parent / Child" path label (`SessionFolderItem.displayName`); collapsing a folder hides its whole subtree. Folder actions resolve their owning scope per folder entry (folders from multiple worktree scopes can coexist under one project).
-- Archived sessions are not shown in the web/desktop sidebar; the Archive page (`ArchiveView`, `useUIStore.isArchivePageOpen`) replaces the old toggle. VS Code keeps inline archived buckets behind `showArchivedSessions` (compact webview has no page surfaces). Unarchive is not possible through the upstream OpenCode HTTP API (`session.update` can only set a finite `time.archived`).
+- Archived sessions are not shown in the web/desktop sidebar; the Archive page (`ArchiveView`, `useUIStore.isArchivePageOpen`) replaces the old toggle. VS Code keeps inline archived buckets behind `showArchivedSessions` (compact webview has no page surfaces). Restore (unarchive) is available per session (row context menu, Archive page row) and in bulk (selection bar) and writes `time.archived = 0` — the server cannot clear the field over HTTP, so the global session cache splits active/archived client-side (see "Restore (unarchive) contract" in `sync/DOCUMENTATION.md`).
 - Scheduled tasks (`ScheduledTasksDialog`, now a full-page surface on web/desktop) and per-project worktree management (`WorktreesView`, opened from the project menu) render as overlays inside `<main>` in `MainLayout`; the sidebar no longer mounts them.
 - Group-level PR-status polling/indicators and worktree-group drag-to-reorder were removed together with the worktree grouping level; `oc.sessions.groupOrder` is no longer read or written. Worktree PR/branch context lives in the Worktrees surface.
 - Root session menus can quickly create a worktree from the session directory's current branch and move the full session subtree there while idle.
diff --git a/packages/ui/src/components/session/sidebar/SessionNodeItem.tsx b/packages/ui/src/components/session/sidebar/SessionNodeItem.tsx
index a518777f..ee143afd 100644
--- a/packages/ui/src/components/session/sidebar/SessionNodeItem.tsx
+++ b/packages/ui/src/components/session/sidebar/SessionNodeItem.tsx
@@ -92,6 +92,7 @@ type Props = {
   createFolderAndStartRename: (scopeKey: string, parentId?: string | null) => { id: string } | null;
   openContextPanelTab: (directory: string, options: { mode: 'chat'; dedupeKey: string; label: string; sessionTitleFallback?: string; readOnly?: boolean }) => void;
   handleDeleteSession: (session: Session, source?: { archivedBucket?: boolean; hardDelete?: boolean; skipConfirm?: boolean }) => void;
+  handleRestoreSession: (session: Session) => void;
   mobileVariant: boolean;
   alwaysShowActions: boolean;
   renderSessionNode: (
@@ -287,6 +288,7 @@ function SessionNodeItemComponent(props: Props): React.ReactNode {
     createFolderAndStartRename,
     openContextPanelTab,
     handleDeleteSession,
+    handleRestoreSession,
     mobileVariant,
     alwaysShowActions,
     renderSessionNode,
@@ -1092,6 +1094,12 @@ function SessionNodeItemComponent(props: Props): React.ReactNode {
           {t('sessions.sidebar.bulkActions.archive')}
         </Item>
       ) : null}
+      {archivedBucket ? (
+        <Item className="[&>svg]:mr-1" onClick={() => handleRestoreSession(session)}>
+          <Icon name="inbox-unarchive" className="mr-1 h-4 w-4" />
+          {t('sessions.sidebar.bulkActions.restore')}
+        </Item>
+      ) : null}
       <Item className="text-destructive focus:text-destructive [&>svg]:mr-1" onClick={() => handleDeleteSession(session, { archivedBucket, hardDelete: true })}>
         <Icon name="delete-bin" className="mr-1 h-4 w-4" />
         {t('sessions.sidebar.bulkActions.delete')}
@@ -1607,6 +1615,7 @@ const areSessionNodeItemPropsEqual = (prev: Props, next: Props): boolean => {
     && prev.createFolderAndStartRename === next.createFolderAndStartRename
     && prev.openContextPanelTab === next.openContextPanelTab
     && prev.handleDeleteSession === next.handleDeleteSession
+    && prev.handleRestoreSession === next.handleRestoreSession
     && prev.renderSessionNode === next.renderSessionNode;
 };
 
diff --git a/packages/ui/src/components/session/sidebar/hooks/useSessionActions.ts b/packages/ui/src/components/session/sidebar/hooks/useSessionActions.ts
index 23a139a4..a449224e 100644
--- a/packages/ui/src/components/session/sidebar/hooks/useSessionActions.ts
+++ b/packages/ui/src/components/session/sidebar/hooks/useSessionActions.ts
@@ -40,6 +40,7 @@ type Args = {
   deleteSessions: (ids: string[]) => Promise<{ deletedIds: string[]; failedIds: string[] }>;
   archiveSession: (id: string) => Promise<boolean>;
   archiveSessions: (ids: string[]) => Promise<{ archivedIds: string[]; failedIds: string[] }>;
+  unarchiveSession: (id: string) => Promise<boolean>;
   childrenMap: Map<string, Session[]>;
   showDeletionDialog: boolean;
   setDeleteSessionConfirm: DeleteSessionConfirmSetter;
@@ -286,6 +287,18 @@ export const useSessionActions = (args: Args) => {
     await executeDeleteSession(session, { archivedBucket }, { descendantIds });
   }, [args, executeDeleteSession]);
 
+  const handleRestoreSession = React.useCallback(
+    async (session: Session) => {
+      const success = await args.unarchiveSession(session.id);
+      if (success) {
+        toast.success(t('sessions.sidebar.session.restore.success'));
+      } else {
+        toast.error(t('sessions.sidebar.session.restore.error'));
+      }
+    },
+    [args, t],
+  );
+
   return {
     copiedSessionId,
     handleSessionSelect,
@@ -297,6 +310,7 @@ export const useSessionActions = (args: Args) => {
     handleCopySessionId,
     handleUnshareSession,
     handleDeleteSession,
+    handleRestoreSession,
     confirmDeleteSession,
   };
 };
diff --git a/packages/ui/src/components/session/sidebar/hooks/useSidebarBulkActions.ts b/packages/ui/src/components/session/sidebar/hooks/useSidebarBulkActions.ts
index 90a8abf7..af3c5428 100644
--- a/packages/ui/src/components/session/sidebar/hooks/useSidebarBulkActions.ts
+++ b/packages/ui/src/components/session/sidebar/hooks/useSidebarBulkActions.ts
@@ -18,6 +18,7 @@ type Args = {
   removeSessionsFromFolders: (scopeKey: string, sessionIds: string[]) => void;
   createFolderAndStartRename: (scopeKey: string, parentId?: string | null) => { id: string } | null;
   archiveSessions: (ids: string[]) => Promise<{ archivedIds: string[]; failedIds: string[] }>;
+  unarchiveSessions: (ids: string[]) => Promise<{ restoredIds: string[]; failedIds: string[] }>;
   deleteSessions: (ids: string[]) => Promise<{ deletedIds: string[]; failedIds: string[] }>;
   setBulkDeleteConfirm: React.Dispatch<React.SetStateAction<{
     sessionCount: number;
@@ -50,6 +51,7 @@ export const useSidebarBulkActions = (args: Args) => {
     removeSessionsFromFolders,
     createFolderAndStartRename,
     archiveSessions,
+    unarchiveSessions,
     deleteSessions,
     setBulkDeleteConfirm,
   } = args;
@@ -206,6 +208,23 @@ export const useSidebarBulkActions = (args: Args) => {
     setBulkDeleteConfirm({ sessionCount: count, archivedBucket: bulkScopeIsArchived });
   }, [bulkScopeIsArchived, executeBulkDelete, selectedIds, showDeletionDialog, setBulkDeleteConfirm, hasSelection]);
 
+  const handleBulkRestore = React.useCallback(async () => {
+    if (!hasSelection || !bulkScopeIsArchived) return;
+    const ids = Array.from(selectedIds);
+    const { restoredIds, failedIds } = await unarchiveSessions(ids);
+    if (restoredIds.length > 0) {
+      toast.success(restoredIds.length === 1
+        ? t('sessions.sidebar.bulkActions.restoredSingle', { count: restoredIds.length })
+        : t('sessions.sidebar.bulkActions.restoredPlural', { count: restoredIds.length }));
+    }
+    if (failedIds.length > 0) {
+      toast.error(failedIds.length === 1
+        ? t('sessions.sidebar.bulkActions.failedRestoreSingle', { count: failedIds.length })
+        : t('sessions.sidebar.bulkActions.failedRestorePlural', { count: failedIds.length }));
+    }
+    useSessionMultiSelectStore.getState().clear();
+  }, [bulkScopeIsArchived, hasSelection, selectedIds, t, unarchiveSessions]);
+
   const confirmBulkDelete = React.useCallback(async () => {
     setBulkDeleteConfirm(null);
     await executeBulkDelete();
@@ -275,6 +294,7 @@ export const useSidebarBulkActions = (args: Args) => {
     handleBulkCreateFolderAndMove,
     handleBulkRemoveFromFolder,
     handleBulkDelete,
+    handleBulkRestore,
     confirmBulkDelete,
   };
 };
diff --git a/packages/ui/src/components/views/ArchiveView.tsx b/packages/ui/src/components/views/ArchiveView.tsx
index 38213835..b5f6b1c1 100644
--- a/packages/ui/src/components/views/ArchiveView.tsx
+++ b/packages/ui/src/components/views/ArchiveView.tsx
@@ -2,6 +2,7 @@ import React from 'react';
 import type { Session } from '@opencode-ai/sdk/v2';
 import { Icon } from '@/components/icon/Icon';
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip';
+import { toast } from '@/components/ui';
 import { cn, formatDirectoryName } from '@/lib/utils';
 import { useI18n } from '@/lib/i18n';
 import { sessionEvents } from '@/lib/sessionEvents';
@@ -28,6 +29,7 @@ export function ArchiveView(): React.ReactNode {
   const setOpen = useUIStore((state) => state.setArchivePageOpen);
   const setActiveMainTab = useUIStore((state) => state.setActiveMainTab);
   const setCurrentSession = useSessionUIStore((state) => state.setCurrentSession);
+  const unarchiveSession = useSessionUIStore((state) => state.unarchiveSession);
   const homeDirectory = useDirectoryStore((state) => state.homeDirectory);
   const archivedSessions = useGlobalSessionsStore(useShallow((state) => open ? state.archivedSessions : []));
   const [query, setQuery] = React.useState('');
@@ -87,6 +89,16 @@ export function ArchiveView(): React.ReactNode {
     setOpen(false);
   }, [setActiveMainTab, setCurrentSession, setOpen]);
 
+  const restoreSession = React.useCallback((session: Session) => {
+    void unarchiveSession(session.id).then((success) => {
+      if (success) {
+        toast.success(t('sessions.sidebar.session.restore.success'));
+      } else {
+        toast.error(t('sessions.sidebar.session.restore.error'));
+      }
+    });
+  }, [t, unarchiveSession]);
+
   if (!open) return null;
 
   const renderDirectoryItem = (
@@ -196,7 +208,7 @@ export function ArchiveView(): React.ReactNode {
                 return (
                   <div
                     key={session.id}
-                    className="group relative flex cursor-pointer items-center gap-3 rounded-md py-1 pl-2 pr-2 transition-[padding] hover:bg-interactive-hover/40 hover:pr-8 focus-within:pr-8"
+                    className="group relative flex cursor-pointer items-center gap-3 rounded-md py-1 pl-2 pr-2 transition-[padding] hover:bg-interactive-hover/40 hover:pr-14 focus-within:pr-14"
                     onClick={() => openSession(session)}
                     role="button"
                     tabIndex={0}
@@ -218,6 +230,17 @@ export function ArchiveView(): React.ReactNode {
                     <span className="flex-shrink-0 text-[0.72rem] text-muted-foreground/75">
                       {formatSessionDateLabel(session.time?.archived ?? session.time?.updated ?? session.time?.created ?? Date.now())}
                     </span>
+                    <button
+                      type="button"
+                      onClick={(event) => {
+                        event.stopPropagation();
+                        restoreSession(session);
+                      }}
+                      className="absolute right-7 top-1/2 inline-flex h-6 w-6 -translate-y-1/2 items-center justify-center rounded-md text-muted-foreground opacity-0 transition-opacity pointer-events-none hover:text-foreground group-hover:opacity-100 group-hover:pointer-events-auto focus-visible:opacity-100 focus-visible:pointer-events-auto focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50"
+                      aria-label={t('sessions.archivePage.restoreSessionAria', { title: session.title || t('sessions.sidebar.session.untitled') })}
+                    >
+                      <Icon name="inbox-unarchive" className="h-3.5 w-3.5" />
+                    </button>
                     <button
                       type="button"
                       onClick={(event) => {
diff --git a/packages/ui/src/lib/i18n/messages/de.ts b/packages/ui/src/lib/i18n/messages/de.ts
index 99a50cd0..0db76c86 100644
--- a/packages/ui/src/lib/i18n/messages/de.ts
+++ b/packages/ui/src/lib/i18n/messages/de.ts
@@ -426,6 +426,11 @@ export const dict = {
   'sessions.sidebar.bulkActions.archivedPlural': '{count} Sitzungen archiviert',
   'sessions.sidebar.bulkActions.failedArchiveSingle': 'Fehler beim Archivieren von {count} Sitzung',
   'sessions.sidebar.bulkActions.failedArchivePlural': 'Fehler beim Archivieren von {count} Sitzungen',
+  'sessions.sidebar.bulkActions.restore': 'Wiederherstellen',
+  'sessions.sidebar.bulkActions.restoredSingle': '{count} Sitzung wiederhergestellt',
+  'sessions.sidebar.bulkActions.restoredPlural': '{count} Sitzungen wiederhergestellt',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': 'Fehler beim Wiederherstellen von {count} Sitzung',
+  'sessions.sidebar.bulkActions.failedRestorePlural': 'Fehler beim Wiederherstellen von {count} Sitzungen',
   'sessions.sidebar.folders.none': 'Noch keine Ordner',
   'sessions.sidebar.folders.newFolderEllipsis': 'Neuer Ordner...',
   'sessions.sidebar.folders.removeFromFolder': 'Aus Ordner entfernen',
@@ -517,6 +522,8 @@ export const dict = {
   'sessions.sidebar.session.delete.error': 'Fehler beim Löschen der Sitzung',
   'sessions.sidebar.session.archive.success': 'Sitzung archiviert',
   'sessions.sidebar.session.archive.error': 'Fehler beim Archivieren der Sitzung',
+  'sessions.sidebar.session.restore.success': 'Sitzung wiederhergestellt',
+  'sessions.sidebar.session.restore.error': 'Fehler beim Wiederherstellen der Sitzung',
   'sessions.sidebar.group.pr.checksPassed': '{success}/{total} Checks bestanden',
   'sessions.sidebar.group.pr.failingCount': '{count} fehlgeschlagen',
   'sessions.sidebar.group.pr.pendingCount': '{count} ausstehend',
@@ -2787,6 +2794,7 @@ export const dict = {
   'sessions.archivePage.deleteProject': 'Alle archivierten Sitzungen in diesem Projekt löschen',
   'sessions.archivePage.deleteProjectAria': 'Alle archivierten Sitzungen in {label} löschen',
   'sessions.archivePage.deleteSessionAria': '{title} löschen',
+  'sessions.archivePage.restoreSessionAria': '{title} wiederherstellen',
   'header.sessionActions.openAria': 'Sitzungsaktionen öffnen',
   'sessions.sidebar.session.menu.copyId': 'Sitzungs-ID kopieren',
   'sessions.sidebar.session.copyId.success': 'Sitzungs-ID kopiert',
diff --git a/packages/ui/src/lib/i18n/messages/en.ts b/packages/ui/src/lib/i18n/messages/en.ts
index 1bb6b1c1..17d137e5 100644
--- a/packages/ui/src/lib/i18n/messages/en.ts
+++ b/packages/ui/src/lib/i18n/messages/en.ts
@@ -449,6 +449,7 @@ export const dict = {
   'sessions.archivePage.deleteProject': 'Delete all archived sessions in this project',
   'sessions.archivePage.deleteProjectAria': 'Delete all archived sessions in {label}',
   'sessions.archivePage.deleteSessionAria': 'Delete {title}',
+  'sessions.archivePage.restoreSessionAria': 'Restore {title}',
   'sessions.switcher.openAria': 'Open session switcher',
   'sessions.switcher.empty': 'No recent sessions',
   'sessions.switcher.draftTitle': 'New session',
@@ -470,6 +471,11 @@ export const dict = {
   'sessions.sidebar.bulkActions.archivedPlural': 'Archived {count} sessions',
   'sessions.sidebar.bulkActions.failedArchiveSingle': 'Failed to archive {count} session',
   'sessions.sidebar.bulkActions.failedArchivePlural': 'Failed to archive {count} sessions',
+  'sessions.sidebar.bulkActions.restore': 'Restore',
+  'sessions.sidebar.bulkActions.restoredSingle': 'Restored {count} session',
+  'sessions.sidebar.bulkActions.restoredPlural': 'Restored {count} sessions',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': 'Failed to restore {count} session',
+  'sessions.sidebar.bulkActions.failedRestorePlural': 'Failed to restore {count} sessions',
   'sessions.sidebar.folders.none': 'No folders yet',
   'sessions.sidebar.folders.newFolderEllipsis': 'New folder...',
   'sessions.sidebar.folders.removeFromFolder': 'Remove from folder',
@@ -573,6 +579,8 @@ export const dict = {
   'sessions.sidebar.session.delete.error': 'Failed to delete session',
   'sessions.sidebar.session.archive.success': 'Session archived',
   'sessions.sidebar.session.archive.error': 'Failed to archive session',
+  'sessions.sidebar.session.restore.success': 'Session restored',
+  'sessions.sidebar.session.restore.error': 'Failed to restore session',
   'sessions.sidebar.group.pr.checksPassed': '{success}/{total} checks passed',
   'sessions.sidebar.group.pr.failingCount': '{count} failing',
   'sessions.sidebar.group.pr.pendingCount': '{count} pending',
diff --git a/packages/ui/src/lib/i18n/messages/es.ts b/packages/ui/src/lib/i18n/messages/es.ts
index 6719cc2b..ea5086d0 100644
--- a/packages/ui/src/lib/i18n/messages/es.ts
+++ b/packages/ui/src/lib/i18n/messages/es.ts
@@ -450,6 +450,7 @@ export const dict: Record<I18nKey, string> = {
   "sessions.archivePage.deleteProject": "Eliminar todas las sesiones archivadas de este proyecto",
   "sessions.archivePage.deleteProjectAria": "Eliminar todas las sesiones archivadas de {label}",
   "sessions.archivePage.deleteSessionAria": "Eliminar {title}",
+  "sessions.archivePage.restoreSessionAria": "Restaurar {title}",
   "sessions.switcher.openAria": "Abrir selector de sesiones",
   "sessions.switcher.empty": "No hay sesiones recientes",
   "sessions.switcher.draftTitle": "Nueva sesión",
@@ -471,6 +472,11 @@ export const dict: Record<I18nKey, string> = {
   "sessions.sidebar.bulkActions.archivedPlural": "Se archivaron {count} sesiones",
   "sessions.sidebar.bulkActions.failedArchiveSingle": "No se pudo archivar {count} sesión",
   "sessions.sidebar.bulkActions.failedArchivePlural": "No se pudo archivar {count} sesiones",
+  "sessions.sidebar.bulkActions.restore": "Restaurar",
+  "sessions.sidebar.bulkActions.restoredSingle": "Se restauró {count} sesión",
+  "sessions.sidebar.bulkActions.restoredPlural": "Se restauraron {count} sesiones",
+  "sessions.sidebar.bulkActions.failedRestoreSingle": "No se pudo restaurar {count} sesión",
+  "sessions.sidebar.bulkActions.failedRestorePlural": "No se pudo restaurar {count} sesiones",
   "sessions.sidebar.folders.none": "No hay carpetas aún",
   "sessions.sidebar.folders.newFolderEllipsis": "Nueva carpeta...",
   "sessions.sidebar.folders.removeFromFolder": "Quitar de carpeta",
@@ -574,6 +580,8 @@ export const dict: Record<I18nKey, string> = {
   "sessions.sidebar.session.delete.error": "No se pudo eliminar la sesión",
   "sessions.sidebar.session.archive.success": "Sesión archivada",
   "sessions.sidebar.session.archive.error": "No se pudo archivar la sesión",
+  "sessions.sidebar.session.restore.success": "Sesión restaurada",
+  "sessions.sidebar.session.restore.error": "No se pudo restaurar la sesión",
   "sessions.sidebar.group.pr.checksPassed": "{success}/{total} comprobaciones aprobadas",
   "sessions.sidebar.group.pr.failingCount": "{count} con fallos",
   "sessions.sidebar.group.pr.pendingCount": "{count} pendientes",
diff --git a/packages/ui/src/lib/i18n/messages/fr.ts b/packages/ui/src/lib/i18n/messages/fr.ts
index 042f21c3..3a625450 100644
--- a/packages/ui/src/lib/i18n/messages/fr.ts
+++ b/packages/ui/src/lib/i18n/messages/fr.ts
@@ -285,6 +285,7 @@ export const dict = {
   'sessions.archivePage.deleteProject': 'Supprimer toutes les sessions archivées de ce projet',
   'sessions.archivePage.deleteProjectAria': 'Supprimer toutes les sessions archivées de {label}',
   'sessions.archivePage.deleteSessionAria': 'Supprimer {title}',
+  'sessions.archivePage.restoreSessionAria': 'Restaurer {title}',
   'sessions.switcher.openAria': 'Sélecteur de session ouvert',
   'sessions.switcher.empty': 'Aucune session récente',
   'sessions.switcher.draftTitle': 'Nouvelle session',
@@ -306,6 +307,11 @@ export const dict = {
   'sessions.sidebar.bulkActions.archivedPlural': 'Sessions {count} archivées',
   'sessions.sidebar.bulkActions.failedArchiveSingle': 'Échec de l\'archivage de la session {count}',
   'sessions.sidebar.bulkActions.failedArchivePlural': 'Échec de l\'archivage des sessions {count}',
+  'sessions.sidebar.bulkActions.restore': 'Restaurer',
+  'sessions.sidebar.bulkActions.restoredSingle': 'Session {count} restaurée',
+  'sessions.sidebar.bulkActions.restoredPlural': 'Sessions {count} restaurées',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': 'Échec de la restauration de la session {count}',
+  'sessions.sidebar.bulkActions.failedRestorePlural': 'Échec de la restauration des sessions {count}',
   'sessions.sidebar.folders.none': 'Aucun dossier pour l\'instant',
   'sessions.sidebar.folders.newFolderEllipsis': 'Nouveau dossier...',
   'sessions.sidebar.folders.removeFromFolder': 'Supprimer du dossier',
@@ -409,6 +415,8 @@ export const dict = {
   'sessions.sidebar.session.delete.error': 'Échec de la suppression de la session',
   'sessions.sidebar.session.archive.success': 'Session archivée',
   'sessions.sidebar.session.archive.error': 'Échec de l\'archivage de la session',
+  'sessions.sidebar.session.restore.success': 'Session restaurée',
+  'sessions.sidebar.session.restore.error': 'Échec de la restauration de la session',
   'sessions.sidebar.group.pr.checksPassed': 'Contrôles {success}/{total} réussis',
   'sessions.sidebar.group.pr.failingCount': 'Échec de {count}',
   'sessions.sidebar.group.pr.pendingCount': '{count} en attente',
diff --git a/packages/ui/src/lib/i18n/messages/ja.ts b/packages/ui/src/lib/i18n/messages/ja.ts
index 0feeccc7..181ec3e9 100644
--- a/packages/ui/src/lib/i18n/messages/ja.ts
+++ b/packages/ui/src/lib/i18n/messages/ja.ts
@@ -450,6 +450,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.archivePage.deleteProject': 'このプロジェクトのアーカイブ済みセッションをすべて削除',
   'sessions.archivePage.deleteProjectAria': '{label} のアーカイブ済みセッションをすべて削除',
   'sessions.archivePage.deleteSessionAria': '{title} を削除',
+  'sessions.archivePage.restoreSessionAria': '{title} を復元',
   'sessions.switcher.openAria': 'セッションスイッチャーを開く',
   'sessions.switcher.empty': '最近のセッションはありません',
   'sessions.switcher.draftTitle': '新しいセッション',
@@ -471,6 +472,11 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.bulkActions.archivedPlural': '{count}セッションをアーカイブしました',
   'sessions.sidebar.bulkActions.failedArchiveSingle': '{count}セッションのアーカイブに失敗しました',
   'sessions.sidebar.bulkActions.failedArchivePlural': '{count}セッションのアーカイブに失敗しました',
+  'sessions.sidebar.bulkActions.restore': '復元',
+  'sessions.sidebar.bulkActions.restoredSingle': '{count}セッションを復元しました',
+  'sessions.sidebar.bulkActions.restoredPlural': '{count}セッションを復元しました',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': '{count}セッションの復元に失敗しました',
+  'sessions.sidebar.bulkActions.failedRestorePlural': '{count}セッションの復元に失敗しました',
   'sessions.sidebar.folders.none': 'まだフォルダがありません',
   'sessions.sidebar.folders.newFolderEllipsis': '新しいフォルダ...',
   'sessions.sidebar.folders.removeFromFolder': 'フォルダから削除',
@@ -574,6 +580,8 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.session.delete.error': 'セッションの削除に失敗しました',
   'sessions.sidebar.session.archive.success': 'セッションをアーカイブしました',
   'sessions.sidebar.session.archive.error': 'セッションのアーカイブに失敗しました',
+  'sessions.sidebar.session.restore.success': 'セッションを復元しました',
+  'sessions.sidebar.session.restore.error': 'セッションの復元に失敗しました',
   'sessions.sidebar.group.pr.checksPassed': '{success}/{total}のチェックに合格',
   'sessions.sidebar.group.pr.failingCount': '{count}件失敗',
   'sessions.sidebar.group.pr.pendingCount': '{count}件保留中',
diff --git a/packages/ui/src/lib/i18n/messages/ko.ts b/packages/ui/src/lib/i18n/messages/ko.ts
index c47b078b..150a56ce 100644
--- a/packages/ui/src/lib/i18n/messages/ko.ts
+++ b/packages/ui/src/lib/i18n/messages/ko.ts
@@ -450,6 +450,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.archivePage.deleteProject': '이 프로젝트의 보관된 세션 모두 삭제',
   'sessions.archivePage.deleteProjectAria': '{label}의 보관된 세션 모두 삭제',
   'sessions.archivePage.deleteSessionAria': '{title} 삭제',
+  'sessions.archivePage.restoreSessionAria': '{title} 복원',
   'sessions.switcher.openAria': '세션 전환기 열기',
   'sessions.switcher.empty': '최근 세션 없음',
   'sessions.switcher.draftTitle': '새 세션',
@@ -471,6 +472,11 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.bulkActions.archivedPlural': '세션 {count}개 보관됨',
   'sessions.sidebar.bulkActions.failedArchiveSingle': '세션 {count}개 보관 실패',
   'sessions.sidebar.bulkActions.failedArchivePlural': '세션 {count}개 보관 실패',
+  'sessions.sidebar.bulkActions.restore': '복원',
+  'sessions.sidebar.bulkActions.restoredSingle': '세션 {count}개 복원됨',
+  'sessions.sidebar.bulkActions.restoredPlural': '세션 {count}개 복원됨',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': '세션 {count}개 복원 실패',
+  'sessions.sidebar.bulkActions.failedRestorePlural': '세션 {count}개 복원 실패',
   'sessions.sidebar.folders.none': '아직 폴더 없음',
   'sessions.sidebar.folders.newFolderEllipsis': '새 폴더…',
   'sessions.sidebar.folders.removeFromFolder': '폴더에서 제거',
@@ -574,6 +580,8 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.session.delete.error': '세션 삭제 실패',
   'sessions.sidebar.session.archive.success': '세션 보관됨',
   'sessions.sidebar.session.archive.error': '세션 보관 실패',
+  'sessions.sidebar.session.restore.success': '세션 복원됨',
+  'sessions.sidebar.session.restore.error': '세션 복원 실패',
   'sessions.sidebar.group.pr.checksPassed': '검사 통과: {success}/{total}',
   'sessions.sidebar.group.pr.failingCount': '실패 {count}개',
   'sessions.sidebar.group.pr.pendingCount': '{count} 대기 중',
diff --git a/packages/ui/src/lib/i18n/messages/pl.ts b/packages/ui/src/lib/i18n/messages/pl.ts
index acc03cfd..8f93e1f6 100644
--- a/packages/ui/src/lib/i18n/messages/pl.ts
+++ b/packages/ui/src/lib/i18n/messages/pl.ts
@@ -266,6 +266,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.archivePage.deleteProject': 'Usuń wszystkie zarchiwizowane sesje tego projektu',
   'sessions.archivePage.deleteProjectAria': 'Usuń wszystkie zarchiwizowane sesje w {label}',
   'sessions.archivePage.deleteSessionAria': 'Usuń {title}',
+  'sessions.archivePage.restoreSessionAria': 'Przywróć {title}',
   'sessions.switcher.openAria': 'Otwórz przełącznik sesji',
   'sessions.switcher.empty': 'Brak ostatnich sesji',
   'sessions.switcher.draftTitle': 'Nowa sesja',
@@ -333,6 +334,11 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.bulkActions.archivedPlural': 'Zarchiwizowano {count} sesji',
   'sessions.sidebar.bulkActions.failedArchiveSingle': 'Nie udało się zarchiwizować {count} sesji',
   'sessions.sidebar.bulkActions.failedArchivePlural': 'Nie udało się zarchiwizować {count} sesji',
+  'sessions.sidebar.bulkActions.restore': 'Przywróć',
+  'sessions.sidebar.bulkActions.restoredSingle': 'Przywrócono {count} sesję',
+  'sessions.sidebar.bulkActions.restoredPlural': 'Przywrócono {count} sesji',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': 'Nie udało się przywrócić {count} sesji',
+  'sessions.sidebar.bulkActions.failedRestorePlural': 'Nie udało się przywrócić {count} sesji',
   'sessions.scheduledTasks.dialog.title': 'Zaplanowane zadania',
   'sessions.scheduledTasks.dialog.description': 'Zadania po stronie serwera, które tworzą nową sesję i wysyłają skonfigurowany prompt.',
   'sessions.scheduledTasks.dialog.project.label': 'Projekt',
@@ -574,6 +580,8 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.session.delete.error': 'Nie udało się usunąć sesji',
   'sessions.sidebar.session.archive.success': 'Sesja zarchiwizowana',
   'sessions.sidebar.session.archive.error': 'Nie udało się zarchiwizować sesji',
+  'sessions.sidebar.session.restore.success': 'Sesja przywrócona',
+  'sessions.sidebar.session.restore.error': 'Nie udało się przywrócić sesji',
   'sessions.sidebar.group.pr.checksPassed': '{success}/{total} testów przeszło',
   'sessions.sidebar.group.pr.failingCount': '{count} niepowodzeń',
   'sessions.sidebar.group.pr.pendingCount': '{count} oczekujących',
diff --git a/packages/ui/src/lib/i18n/messages/pt-BR.ts b/packages/ui/src/lib/i18n/messages/pt-BR.ts
index 748628b3..44fef67a 100644
--- a/packages/ui/src/lib/i18n/messages/pt-BR.ts
+++ b/packages/ui/src/lib/i18n/messages/pt-BR.ts
@@ -450,6 +450,7 @@ export const dict: Record<I18nKey, string> = {
   "sessions.archivePage.deleteProject": "Excluir todas as sessões arquivadas deste projeto",
   "sessions.archivePage.deleteProjectAria": "Excluir todas as sessões arquivadas de {label}",
   "sessions.archivePage.deleteSessionAria": "Excluir {title}",
+  "sessions.archivePage.restoreSessionAria": "Restaurar {title}",
   "sessions.switcher.openAria": "Abrir seletor de sessões",
   "sessions.switcher.empty": "Nenhuma sessão recente",
   "sessions.switcher.draftTitle": "Nova sessão",
@@ -471,6 +472,11 @@ export const dict: Record<I18nKey, string> = {
   "sessions.sidebar.bulkActions.archivedPlural": "{count} sessões arquivadas",
   "sessions.sidebar.bulkActions.failedArchiveSingle": "Não foi possível arquivar {count} sessão",
   "sessions.sidebar.bulkActions.failedArchivePlural": "Não foi possível arquivar {count} sessões",
+  "sessions.sidebar.bulkActions.restore": "Restaurar",
+  "sessions.sidebar.bulkActions.restoredSingle": "{count} sessão restaurada",
+  "sessions.sidebar.bulkActions.restoredPlural": "{count} sessões restauradas",
+  "sessions.sidebar.bulkActions.failedRestoreSingle": "Não foi possível restaurar {count} sessão",
+  "sessions.sidebar.bulkActions.failedRestorePlural": "Não foi possível restaurar {count} sessões",
   "sessions.sidebar.folders.none": "Não há pastas ainda",
   "sessions.sidebar.folders.newFolderEllipsis": "Nova pasta...",
   "sessions.sidebar.folders.removeFromFolder": "Remover da pasta",
@@ -574,6 +580,8 @@ export const dict: Record<I18nKey, string> = {
   "sessions.sidebar.session.delete.error": "Não foi possível excluir a sessão",
   "sessions.sidebar.session.archive.success": "Sessão archivada",
   "sessions.sidebar.session.archive.error": "Não foi possível arquivar a sessão",
+  "sessions.sidebar.session.restore.success": "Sessão restaurada",
+  "sessions.sidebar.session.restore.error": "Não foi possível restaurar a sessão",
   "sessions.sidebar.group.pr.checksPassed": "{success}/{total} checks pasadas",
   "sessions.sidebar.group.pr.failingCount": "{count} com fallos",
   "sessions.sidebar.group.pr.pendingCount": "{count} pendentes",
diff --git a/packages/ui/src/lib/i18n/messages/uk.ts b/packages/ui/src/lib/i18n/messages/uk.ts
index c573b669..c8663cea 100644
--- a/packages/ui/src/lib/i18n/messages/uk.ts
+++ b/packages/ui/src/lib/i18n/messages/uk.ts
@@ -450,6 +450,7 @@ export const dict: Record<I18nKey, string> = {
   "sessions.archivePage.deleteProject": "Видалити всі архівні сесії цього проєкту",
   "sessions.archivePage.deleteProjectAria": "Видалити всі архівні сесії у {label}",
   "sessions.archivePage.deleteSessionAria": "Видалити {title}",
+  "sessions.archivePage.restoreSessionAria": "Відновити {title}",
   "sessions.switcher.openAria": "Відкрити перемикач сесій",
   "sessions.switcher.empty": "Немає недавніх сесій",
   "sessions.switcher.draftTitle": "Нова сесія",
@@ -471,6 +472,11 @@ export const dict: Record<I18nKey, string> = {
   "sessions.sidebar.bulkActions.archivedPlural": "Заархівовано сесій: {count}",
   "sessions.sidebar.bulkActions.failedArchiveSingle": "Не вдалося архівувати сесія {count}",
   "sessions.sidebar.bulkActions.failedArchivePlural": "Не вдалося архівувати сесії {count}",
+  "sessions.sidebar.bulkActions.restore": "Відновити",
+  "sessions.sidebar.bulkActions.restoredSingle": "Відновлено сесію: {count}",
+  "sessions.sidebar.bulkActions.restoredPlural": "Відновлено сесій: {count}",
+  "sessions.sidebar.bulkActions.failedRestoreSingle": "Не вдалося відновити сесія {count}",
+  "sessions.sidebar.bulkActions.failedRestorePlural": "Не вдалося відновити сесії {count}",
   "sessions.sidebar.folders.none": "Папок ще немає",
   "sessions.sidebar.folders.newFolderEllipsis": "Нова папка...",
   "sessions.sidebar.folders.removeFromFolder": "Видалити з папки",
@@ -574,6 +580,8 @@ export const dict: Record<I18nKey, string> = {
   "sessions.sidebar.session.delete.error": "Не вдалося видалити сесію",
   "sessions.sidebar.session.archive.success": "Сесію заархівовано",
   "sessions.sidebar.session.archive.error": "Не вдалося заархівувати сесію",
+  "sessions.sidebar.session.restore.success": "Сесію відновлено",
+  "sessions.sidebar.session.restore.error": "Не вдалося відновити сесію",
   "sessions.sidebar.group.pr.checksPassed": "Перевірки {success}/{total} пройдено",
   "sessions.sidebar.group.pr.failingCount": "{count} з помилкою",
   "sessions.sidebar.group.pr.pendingCount": "{count} очікує",
diff --git a/packages/ui/src/lib/i18n/messages/zh-CN.ts b/packages/ui/src/lib/i18n/messages/zh-CN.ts
index 558cc2fa..76ffac2f 100644
--- a/packages/ui/src/lib/i18n/messages/zh-CN.ts
+++ b/packages/ui/src/lib/i18n/messages/zh-CN.ts
@@ -450,6 +450,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.archivePage.deleteProject': '删除此项目的所有已归档会话',
   'sessions.archivePage.deleteProjectAria': '删除 {label} 的所有已归档会话',
   'sessions.archivePage.deleteSessionAria': '删除 {title}',
+  'sessions.archivePage.restoreSessionAria': '还原 {title}',
   'sessions.switcher.openAria': '打开会话切换器',
   'sessions.switcher.empty': '没有最近会话',
   'sessions.switcher.draftTitle': '新会话',
@@ -471,6 +472,11 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.bulkActions.archivedPlural': '已归档 {count} 个会话',
   'sessions.sidebar.bulkActions.failedArchiveSingle': '归档 {count} 个会话失败',
   'sessions.sidebar.bulkActions.failedArchivePlural': '归档 {count} 个会话失败',
+  'sessions.sidebar.bulkActions.restore': '还原',
+  'sessions.sidebar.bulkActions.restoredSingle': '已还原 {count} 个会话',
+  'sessions.sidebar.bulkActions.restoredPlural': '已还原 {count} 个会话',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': '还原 {count} 个会话失败',
+  'sessions.sidebar.bulkActions.failedRestorePlural': '还原 {count} 个会话失败',
   'sessions.sidebar.folders.none': '暂无文件夹',
   'sessions.sidebar.folders.newFolderEllipsis': '新建文件夹...',
   'sessions.sidebar.folders.removeFromFolder': '从文件夹中移除',
@@ -574,6 +580,8 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.session.delete.error': '删除会话失败',
   'sessions.sidebar.session.archive.success': '会话已归档',
   'sessions.sidebar.session.archive.error': '归档会话失败',
+  'sessions.sidebar.session.restore.success': '会话已还原',
+  'sessions.sidebar.session.restore.error': '还原会话失败',
   'sessions.sidebar.group.pr.checksPassed': '{success}/{total} 项检查已通过',
   'sessions.sidebar.group.pr.failingCount': '{count} 项失败',
   'sessions.sidebar.group.pr.pendingCount': '{count} 项等待中',
diff --git a/packages/ui/src/lib/i18n/messages/zh-TW.ts b/packages/ui/src/lib/i18n/messages/zh-TW.ts
index 6bf7546a..3538d59c 100644
--- a/packages/ui/src/lib/i18n/messages/zh-TW.ts
+++ b/packages/ui/src/lib/i18n/messages/zh-TW.ts
@@ -463,6 +463,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.archivePage.deleteProject': '刪除此專案的所有已封存工作階段',
   'sessions.archivePage.deleteProjectAria': '刪除 {label} 的所有已封存工作階段',
   'sessions.archivePage.deleteSessionAria': '刪除 {title}',
+  'sessions.archivePage.restoreSessionAria': '還原 {title}',
   'sessions.switcher.openAria': '開啟會話切換器',
   'sessions.switcher.empty': '沒有最近會話',
   'sessions.switcher.draftTitle': '新會話',
@@ -484,6 +485,11 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.bulkActions.archivedPlural': '已封存 {count} 個會話',
   'sessions.sidebar.bulkActions.failedArchiveSingle': '封存 {count} 個會話失敗',
   'sessions.sidebar.bulkActions.failedArchivePlural': '封存 {count} 個會話失敗',
+  'sessions.sidebar.bulkActions.restore': '還原',
+  'sessions.sidebar.bulkActions.restoredSingle': '已還原 {count} 個會話',
+  'sessions.sidebar.bulkActions.restoredPlural': '已還原 {count} 個會話',
+  'sessions.sidebar.bulkActions.failedRestoreSingle': '還原 {count} 個會話失敗',
+  'sessions.sidebar.bulkActions.failedRestorePlural': '還原 {count} 個會話失敗',
   'sessions.sidebar.folders.none': '暫無資料夾',
   'sessions.sidebar.folders.newFolderEllipsis': '新增資料夾...',
   'sessions.sidebar.folders.removeFromFolder': '從資料夾中移除',
@@ -587,6 +593,8 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.session.delete.error': '刪除會話失敗',
   'sessions.sidebar.session.archive.success': '會話已封存',
   'sessions.sidebar.session.archive.error': '封存會話失敗',
+  'sessions.sidebar.session.restore.success': '會話已還原',
+  'sessions.sidebar.session.restore.error': '還原會話失敗',
   'sessions.sidebar.group.pr.checksPassed': '{success}/{total} 項檢查已通過',
   'sessions.sidebar.group.pr.failingCount': '{count} 項失敗',
   'sessions.sidebar.group.pr.pendingCount': '{count} 項等待中',
diff --git a/packages/ui/src/stores/DOCUMENTATION.md b/packages/ui/src/stores/DOCUMENTATION.md
index 65ad473a..a578d61f 100644
--- a/packages/ui/src/stores/DOCUMENTATION.md
+++ b/packages/ui/src/stores/DOCUMENTATION.md
@@ -59,8 +59,8 @@ User-visible session ordering is also not owned by the global cache array order.
 
 Global refresh rules:
 
-- The OpenCode `archived` list flag means "also include archived sessions": the server only drops its `time_archived IS NULL` condition. `listGlobalSessionPages` therefore narrows archived requests to records carrying `time.archived`, at the data boundary, so the archived cache never holds active sessions and no consumer has to re-derive that. Pagination progress stays measured on the raw response, so a page that is full upstream but filtered out here is not mistaken for the last page.
-- Per-directory refresh is bounded to two requests across callers and prioritizes the current directory.
+- The OpenCode `archived` list flag means "also include archived sessions": the server only drops its `time_archived IS NULL` condition. The global cache therefore loads with one inclusive request (`archived: true`) and splits active/archived client-side via `splitGlobalSessionsByArchived` — an `archived: false` request cannot be truthful because the server filter excludes restored sessions (`time.archived` falsy-but-present, see "Restore (unarchive) contract" in `sync/DOCUMENTATION.md`). For callers that still want only archived records, `listGlobalSessionPages` narrows inclusive responses at the data boundary (default `narrowToArchived`), so the archived cache never holds active sessions and no consumer has to re-derive that. Pagination progress stays measured on the raw response, so a page that is full upstream but filtered out here is not mistaken for the last page.
+- Per-directory refresh issues one inclusive request per directory (previously two), bounded to two requests across callers and prioritizing the current directory.
 - Each directory is an independent completeness scope. A failed directory preserves its previous sessions while successful directories reconcile normally.
 - Fetch failure must remain distinguishable from a successful empty list; failed scopes cannot destructively clear cached sessions.
 - Runtime switch increments the load generation and clears the previous runtime's snapshot so stale in-flight work cannot commit.
diff --git a/packages/ui/src/stores/globalSessions.test.ts b/packages/ui/src/stores/globalSessions.test.ts
index 1319568d..5001bd40 100644
--- a/packages/ui/src/stores/globalSessions.test.ts
+++ b/packages/ui/src/stores/globalSessions.test.ts
@@ -1,7 +1,7 @@
 import { describe, expect, test } from 'bun:test'
 import type { OpencodeClient } from '@opencode-ai/sdk/v2'
 
-import { listGlobalSessionPages } from './globalSessions'
+import { listGlobalSessionPages, splitGlobalSessionsByArchived } from './globalSessions'
 
 describe('listGlobalSessionPages', () => {
   test('sanitizes session list records before returning them', async () => {
@@ -138,6 +138,27 @@ describe('listGlobalSessionPages', () => {
     expect(sessions.map((session) => session.id)).toEqual(['ses_active_1', 'ses_active_2'])
   })
 
+  test('returns the inclusive response unfiltered when narrowing is disabled', async () => {
+    const apiClient = {
+      experimental: {
+        session: {
+          list: async () => ({
+            data: [
+              { id: 'ses_active', time: { created: 1, updated: 20 } },
+              { id: 'ses_archived', time: { created: 1, updated: 10, archived: 15 } },
+              { id: 'ses_restored', time: { created: 1, updated: 5, archived: 0 } },
+            ],
+            response: { headers: new Headers() },
+          }),
+        },
+      },
+    } as unknown as OpencodeClient
+
+    const sessions = await listGlobalSessionPages(apiClient, { archived: true, narrowToArchived: false, pageSize: 500 })
+
+    expect(sessions.map((session) => session.id)).toEqual(['ses_active', 'ses_archived', 'ses_restored'])
+  })
+
   test('keeps paginating archived pages that are full of non-archived records', async () => {
     const calls: Array<Record<string, unknown>> = []
     const apiClient = {
@@ -279,3 +300,16 @@ describe('listGlobalSessionPages', () => {
     expect(sessions.map((session) => session.id)).toEqual(['ses_1'])
   })
 })
+
+describe('splitGlobalSessionsByArchived', () => {
+  test('classifies restored (falsy archived) records as active', () => {
+    const { active, archived } = splitGlobalSessionsByArchived([
+      { id: 'ses_active', time: { created: 1, updated: 20 } },
+      { id: 'ses_archived', time: { created: 1, updated: 10, archived: 15 } },
+      { id: 'ses_restored', time: { created: 1, updated: 5, archived: 0 } },
+    ] as unknown as Parameters<typeof splitGlobalSessionsByArchived>[0])
+
+    expect(active.map((session) => session.id)).toEqual(['ses_active', 'ses_restored'])
+    expect(archived.map((session) => session.id)).toEqual(['ses_archived'])
+  })
+})
diff --git a/packages/ui/src/stores/globalSessions.ts b/packages/ui/src/stores/globalSessions.ts
index f27a825e..da8ed9ea 100644
--- a/packages/ui/src/stores/globalSessions.ts
+++ b/packages/ui/src/stores/globalSessions.ts
@@ -84,11 +84,38 @@ const unwrapSessionList = (
  */
 const isArchivedSession = (session: GlobalSessionRecord): boolean => Boolean(session.time?.archived);
 
+/**
+ * Split an inclusive (`archived: true`) session page stream into active and
+ * archived buckets. Restored sessions carry `time.archived === 0` (see
+ * `UNARCHIVED_TIMESTAMP` in `sync/session-actions.ts`); the truthiness check
+ * classifies them as active even though the server's own
+ * `time_archived IS NULL` filter would still exclude them, which is why the
+ * global cache must split client-side instead of issuing an
+ * `archived: false` request for its active list.
+ */
+export const splitGlobalSessionsByArchived = <T extends GlobalSessionRecord>(
+    sessions: T[],
+): { active: T[]; archived: T[] } => {
+    const active: T[] = [];
+    const archived: T[] = [];
+    for (const session of sessions) {
+        if (isArchivedSession(session)) archived.push(session);
+        else active.push(session);
+    }
+    return { active, archived };
+};
+
 export async function listGlobalSessionPages(
     apiClient: OpencodeClient,
     options: {
         directory?: string;
         archived: boolean;
+        /**
+         * When `archived` is true, narrow results to records carrying a truthy
+         * `time.archived` (default true). Pass false to receive the inclusive
+         * server response unfiltered, e.g. to split active/archived locally.
+         */
+        narrowToArchived?: boolean;
         roots?: boolean;
         pageSize: number;
         onPage?: (sessions: GlobalSessionRecord[]) => void;
@@ -97,17 +124,17 @@ export async function listGlobalSessionPages(
     const all: GlobalSessionRecord[] = [];
     const seenIds = new Set<string>();
     let cursor: number | undefined;
+    const narrowToArchived = options.narrowToArchived !== false;
     let operation: string;
     if (!options.directory) {
-        operation = `global-sessions.${options.archived ? "archived" : "active"}`;
+        operation = `global-sessions.${options.archived ? (narrowToArchived ? "archived" : "all") : "active"}`;
     } else if (options.roots === true) {
         operation = "bootstrap.sessions.roots";
     } else if (options.archived) {
-        operation = "bootstrap.sessions.archived";
+        operation = narrowToArchived ? "bootstrap.sessions.archived" : "bootstrap.sessions.all";
     } else {
         operation = "bootstrap.sessions.all";
     }
-
     while (true) {
         let attempts = 0;
         const finishPerformanceEvent = startSessionLoadPerformanceEvent({
@@ -150,7 +177,7 @@ export async function listGlobalSessionPages(
             if (!session?.id || seenIds.has(session.id)) continue;
             seenIds.add(session.id);
             appended += 1;
-            if (options.archived && !isArchivedSession(session)) continue;
+            if (options.archived && narrowToArchived && !isArchivedSession(session)) continue;
             all.push(session);
             accepted.push(session);
         }
diff --git a/packages/ui/src/stores/useGlobalSessionsStore-races.test.ts b/packages/ui/src/stores/useGlobalSessionsStore-races.test.ts
index 02c2fc54..a2a7aa90 100644
--- a/packages/ui/src/stores/useGlobalSessionsStore-races.test.ts
+++ b/packages/ui/src/stores/useGlobalSessionsStore-races.test.ts
@@ -20,14 +20,17 @@ const deferred = <T>(): Deferred<T> => {
   return { promise, resolve, reject }
 }
 
-let activeRequest: Deferred<Session[]>
-let archivedRequest: Deferred<Session[]>
+let listRequest: Deferred<Session[]>
 
+// The store issues one inclusive (`archived: true`) paginated request per
+// load/refresh scope and splits active/archived client-side, so restored
+// sessions (`time.archived` falsy-but-present) stay visible in the active
+// list. The mock serves that single request.
 const sdk = {
   experimental: {
     session: {
-      list: async (options: { archived?: boolean }) => ({
-        data: await (options.archived ? archivedRequest.promise : activeRequest.promise),
+      list: async () => ({
+        data: await listRequest.promise,
         response: { headers: new Headers() },
       }),
     },
@@ -38,13 +41,12 @@ const originalGetSdkClient = opencodeClient.getSdkClient
 const session = (id: string, title = id, archived?: number): Session => ({
   id,
   title,
-  time: { created: 1, updated: 1, ...(archived ? { archived } : {}) },
+  time: { created: 1, updated: 1, ...(archived !== undefined ? { archived } : {}) },
 } as Session)
 
 describe("global session mutation reconciliation", () => {
   beforeEach(() => {
-    activeRequest = deferred<Session[]>()
-    archivedRequest = deferred<Session[]>()
+    listRequest = deferred<Session[]>()
     opencodeClient.getSdkClient = () => sdk
     useGlobalSessionsStore.getState().resetForRuntimeSwitch()
   })
@@ -57,8 +59,7 @@ describe("global session mutation reconciliation", () => {
     const loading = useGlobalSessionsStore.getState().loadSessions()
     useGlobalSessionsStore.getState().upsertSession(session("created"))
 
-    activeRequest.resolve([])
-    archivedRequest.resolve([])
+    listRequest.resolve([])
     await loading
 
     expect(useGlobalSessionsStore.getState().activeSessions.map((item) => item.id)).toEqual(["created"])
@@ -70,8 +71,7 @@ describe("global session mutation reconciliation", () => {
     const loading = useGlobalSessionsStore.getState().loadSessions()
     useGlobalSessionsStore.getState().removeSessions([stale.id])
 
-    activeRequest.resolve([stale])
-    archivedRequest.resolve([])
+    listRequest.resolve([stale])
     await loading
 
     expect(useGlobalSessionsStore.getState().activeSessions).toEqual([])
@@ -84,8 +84,7 @@ describe("global session mutation reconciliation", () => {
     const loading = useGlobalSessionsStore.getState().loadSessions()
     useGlobalSessionsStore.getState().archiveSessions([stale.id], 10)
 
-    activeRequest.resolve([stale])
-    archivedRequest.resolve([])
+    listRequest.resolve([stale])
     await loading
 
     expect(useGlobalSessionsStore.getState().activeSessions).toEqual([])
@@ -98,26 +97,35 @@ describe("global session mutation reconciliation", () => {
     const loading = useGlobalSessionsStore.getState().loadSessions()
     useGlobalSessionsStore.getState().upsertSession(session("updated", "New"))
 
-    activeRequest.resolve([stale])
-    archivedRequest.resolve([])
+    listRequest.resolve([stale])
     await loading
 
     expect(useGlobalSessionsStore.getState().activeSessions[0]?.title).toBe("New")
   })
 
-  test("uses commit-time state when one side of the load fails", async () => {
+  test("uses commit-time state when the load fails", async () => {
     const created = session("created")
     const loading = useGlobalSessionsStore.getState().loadSessions()
     useGlobalSessionsStore.getState().upsertSession(created)
 
-    activeRequest.reject(new Error("unavailable"))
-    archivedRequest.resolve([])
+    listRequest.reject(new Error("unavailable"))
     await loading
 
     expect(useGlobalSessionsStore.getState().activeSessions).toEqual([created])
     expect(useGlobalSessionsStore.getState().status).toBe("error")
   })
 
+  test("splits a restored session into the active list", async () => {
+    const loading = useGlobalSessionsStore.getState().loadSessions()
+
+    listRequest.resolve([session("active"), session("archived", "archived", 5), session("restored", "restored", 0)])
+    await loading
+
+    expect(useGlobalSessionsStore.getState().activeSessions.map((item) => item.id)).toEqual(["active", "restored"])
+    expect(useGlobalSessionsStore.getState().archivedSessions.map((item) => item.id)).toEqual(["archived"])
+    expect(useGlobalSessionsStore.getState().status).toBe("ready")
+  })
+
   test("does not undo a move while refreshing the source directory", async () => {
     const source = { ...session("moved"), directory: "/source" } as Session
     const destination = { ...source, directory: "/destination" } as Session
@@ -125,11 +133,24 @@ describe("global session mutation reconciliation", () => {
     const refreshing = useGlobalSessionsStore.getState().refreshSessionsForDirectories(["/source"])
     useGlobalSessionsStore.getState().upsertSession(destination)
 
-    activeRequest.resolve([source])
-    archivedRequest.resolve([])
+    listRequest.resolve([source])
     await refreshing
 
     expect(useGlobalSessionsStore.getState().sessionsByDirectory.get("/source")).toBe(undefined)
     expect(useGlobalSessionsStore.getState().sessionsByDirectory.get("/destination")?.[0]?.id).toBe("moved")
   })
+
+  test("keeps a restore mutation newer than the directory refresh", async () => {
+    const archived = { ...session("restored", "restored", 5), directory: "/source" } as Session
+    useGlobalSessionsStore.getState().applySnapshot([], [archived])
+    const refreshing = useGlobalSessionsStore.getState().refreshSessionsForDirectories(["/source"])
+    useGlobalSessionsStore.getState().upsertSession({ ...archived, time: { ...archived.time, archived: 0 } })
+
+    // The server still reports the pre-restore row for this directory.
+    listRequest.resolve([archived])
+    await refreshing
+
+    expect(useGlobalSessionsStore.getState().activeSessions.map((item) => item.id)).toEqual(["restored"])
+    expect(useGlobalSessionsStore.getState().archivedSessions).toEqual([])
+  })
 })
diff --git a/packages/ui/src/stores/useGlobalSessionsStore.ts b/packages/ui/src/stores/useGlobalSessionsStore.ts
index 3c3e6af2..7f6f3854 100644
--- a/packages/ui/src/stores/useGlobalSessionsStore.ts
+++ b/packages/ui/src/stores/useGlobalSessionsStore.ts
@@ -1,7 +1,7 @@
 import { create } from 'zustand';
 import type { OpencodeClient, Session } from '@opencode-ai/sdk/v2';
 import { opencodeClient } from '@/lib/opencode/client';
-import { listGlobalSessionPages } from '@/stores/globalSessions';
+import { listGlobalSessionPages, splitGlobalSessionsByArchived } from '@/stores/globalSessions';
 import { getReviewTransferDirection, type ReviewTransferDirection } from '@/lib/reviewFlow';
 import { getOriginalSessionID, getReviewSessionID } from '@/lib/sessionReviewMetadata';
 import { normalizePath } from '@/lib/pathNormalization';
@@ -253,7 +253,6 @@ type DirectoryPageResult = {
 const fetchDirectoryPages = async (
   sdk: OpencodeClient,
   directories: Set<string>,
-  archived: boolean,
 ): Promise<DirectoryPageResult> => {
   const currentDirectory = normalizePath(opencodeClient.getDirectory());
   const orderedDirectories = [...directories].sort((left, right) => {
@@ -267,8 +266,11 @@ const fetchDirectoryPages = async (
         status: 'fulfilled' as const,
         value: {
           directory,
+          // One inclusive request per directory: the server has no filter that
+          // returns only active sessions including restored (`time.archived`
+          // falsy-but-present) rows, so fetch everything and split client-side.
           sessions: await withDirectorySessionRefreshSlot(() => (
-            listGlobalSessionPages(sdk, { directory, archived, pageSize: PAGE_SIZE })
+            listGlobalSessionPages(sdk, { directory, archived: true, narrowToArchived: false, pageSize: PAGE_SIZE })
           )),
         },
       };
@@ -526,35 +528,25 @@ export const useGlobalSessionsStore = create<GlobalSessionsState>((set, get) =>
     const loadPromise = (async () => {
       try {
         const sdk = opencodeClient.getSdkClient();
-        const [activeResult, archivedResult] = await Promise.allSettled([
-          listGlobalSessionPages(sdk, { archived: false, pageSize: PAGE_SIZE }),
-          listGlobalSessionPages(sdk, { archived: true, pageSize: PAGE_SIZE }),
-        ]);
-
-        if (activeResult.status === 'rejected') {
-          console.warn('[GlobalSessions] Failed to load active sessions, preserving existing snapshot with fallback merge:', activeResult.reason);
-        }
-        if (archivedResult.status === 'rejected') {
-          console.warn('[GlobalSessions] Failed to load archived sessions, preserving current snapshot:', archivedResult.reason);
-        }
+        // One inclusive fetch, split client-side. The server's
+        // `time_archived IS NULL` active filter would exclude restored
+        // sessions (`time.archived` falsy-but-present), so an
+        // `archived: false` request cannot produce a truthful active list.
+        const allSessions = await listGlobalSessionPages(sdk, {
+          archived: true,
+          narrowToArchived: false,
+          pageSize: PAGE_SIZE,
+        });
 
         if (generation !== loadGeneration) {
           // Runtime switched mid-load: this snapshot belongs to the previous
           // instance — drop it.
           return { activeSessions: [], archivedSessions: [] };
         }
-        const status = activeResult.status === 'fulfilled' && archivedResult.status === 'fulfilled'
-          ? 'ready'
-          : 'error';
+        const { active, archived } = splitGlobalSessionsByArchived(allSessions);
         set((state) => {
-          const fetchedActive = activeResult.status === 'fulfilled'
-            ? activeResult.value
-            : mergeSessionLists(state.activeSessions, fallbackActive);
-          const fetchedArchived = archivedResult.status === 'fulfilled'
-            ? archivedResult.value
-            : state.archivedSessions;
-          const reconciled = overlayMutationsSince(state, fetchedActive, fetchedArchived, baselineRevision);
-          return applySnapshot(state, reconciled.activeSessions, reconciled.archivedSessions, status);
+          const reconciled = overlayMutationsSince(state, active, archived, baselineRevision);
+          return applySnapshot(state, reconciled.activeSessions, reconciled.archivedSessions, 'ready');
         });
         const committed = get();
         return { activeSessions: committed.activeSessions, archivedSessions: committed.archivedSessions };
@@ -597,31 +589,27 @@ export const useGlobalSessionsStore = create<GlobalSessionsState>((set, get) =>
     const generation = loadGeneration;
     const baselineRevision = get().mutationRevision;
     const sdk = opencodeClient.getSdkClient();
-    const [active, archived] = await Promise.all([
-      fetchDirectoryPages(sdk, directorySet, false),
-      fetchDirectoryPages(sdk, directorySet, true),
-    ]);
+    const fetched = await fetchDirectoryPages(sdk, directorySet);
 
     if (generation !== loadGeneration) {
       const state = get();
       return { activeSessions: state.activeSessions, archivedSessions: state.archivedSessions };
     }
 
-    if (active.errors.length > 0) {
-      console.warn('[GlobalSessions] Failed to refresh active sessions for some directories:', active.errors[0]);
-    }
-    if (archived.errors.length > 0) {
-      console.warn('[GlobalSessions] Failed to refresh archived sessions for some directories:', archived.errors[0]);
+    if (fetched.errors.length > 0) {
+      console.warn('[GlobalSessions] Failed to refresh sessions for some directories:', fetched.errors[0]);
     }
 
+    const { active, archived } = splitGlobalSessionsByArchived(fetched.sessions);
+
     set((state) => {
-      let nextActiveSessions = replaceSessionsForDirectories(state.activeSessions, active.sessions, active.directories);
+      let nextActiveSessions = replaceSessionsForDirectories(state.activeSessions, active, fetched.directories);
       nextActiveSessions = mergeSessionLists(nextActiveSessions, fallbackActive);
       if (sameSessionList(state.activeSessions, nextActiveSessions)) {
         nextActiveSessions = state.activeSessions;
       }
 
-      let nextArchivedSessions = replaceSessionsForDirectories(state.archivedSessions, archived.sessions, archived.directories);
+      let nextArchivedSessions = replaceSessionsForDirectories(state.archivedSessions, archived, fetched.directories);
       if (sameSessionList(state.archivedSessions, nextArchivedSessions)) {
         nextArchivedSessions = state.archivedSessions;
       }
diff --git a/packages/ui/src/sync/DOCUMENTATION.md b/packages/ui/src/sync/DOCUMENTATION.md
index 04dd3088..cc9b4abb 100644
--- a/packages/ui/src/sync/DOCUMENTATION.md
+++ b/packages/ui/src/sync/DOCUMENTATION.md
@@ -240,16 +240,38 @@ Examples of global-store updates performed in `session-actions.ts`:
 - `updateSessionTitle()` -> `upsertSession(result.data)`
 - `shareSession()` / `unshareSession()` -> `upsertSession(result.data)`
 - `archiveSession()` / `archiveSessions()` -> wait for server confirmation, then upsert each archived session
+- `unarchiveSession()` / `unarchiveSessions()` -> wait for server confirmation, then upsert each restored session
 - `deleteSession()` / `deleteSessions()` -> wait for server confirmation or `404`, then remove the session and its persisted state
 - `moveSessionToDirectory()` -> move the session between directory stores and update the global directory index
 
+### Restore (unarchive) contract
+
+The OpenCode server cannot clear `time.archived` over HTTP: `session.update`
+only applies the field when the payload carries a finite number, so an omitted
+key is a no-op and `null` is silently ignored. Restore therefore writes
+`time.archived = 0` (`UNARCHIVED_TIMESTAMP` in `session-actions.ts`). Every
+client-side reader classifies archive state by truthiness of `time.archived`,
+so `0` reads as active in the UI, the event reducer, and the OpenCode app/TUI.
+
+The server's `time_archived IS NULL` list filter still excludes such rows, so
+any query that wants a truthful active list must fetch inclusively
+(`archived: true`) and split client-side (`splitGlobalSessionsByArchived`).
+The global sessions store does this for its full and per-directory loads;
+directory bootstrap keeps using the server filter because live child stores
+must not hold archived sessions. A restored session re-enters its live
+directory store through the authoritative `session.updated` event the server
+publishes for the update; until then it remains fully visible through the
+global store (sidebar, switcher) and addressable by ID (message loading).
+
 Archive and delete actions capture the active runtime key when they start and
 recheck it before every store reconciliation, so a response
 produced by the previous runtime is rejected instead of mutating the current
-runtime's live or global session state. A guarded batch stops at the first
-observed runtime change: sessions the server already confirmed remain archived
-or deleted and stay in `archivedIds`/`deletedIds`, while every ID not confirmed
-on the captured runtime is returned in `failedIds` so existing partial-failure
+runtime's live or global session state. Restore follows the same guard: a
+stale completion returns `false` without touching any store. A guarded batch
+stops at the first observed runtime change: sessions the server already
+confirmed remain archived, restored, or deleted and stay in
+`archivedIds`/`restoredIds`/`deletedIds`, while every ID not confirmed on the
+captured runtime is returned in `failedIds` so existing partial-failure
 feedback stays truthful.
 Callers whose confirmation can span a runtime switch may pass an
 `expectedRuntimeKey` captured earlier; ordinary callers are guarded by default.
diff --git a/packages/ui/src/sync/session-actions.test.ts b/packages/ui/src/sync/session-actions.test.ts
index d0cd9f16..84c276f8 100644
--- a/packages/ui/src/sync/session-actions.test.ts
+++ b/packages/ui/src/sync/session-actions.test.ts
@@ -619,6 +619,116 @@ describe("confirmed session removal", () => {
   })
 })
 
+describe("session restore (unarchive)", () => {
+  beforeEach(() => {
+    replyCalls.length = 0
+    registeredSessionDirectories.length = 0
+    globalUpsertedSessions.length = 0
+    sessionUpdateResult = {}
+    beforeSessionUpdateResolve = null
+  })
+
+  test("does not restore locally until the server returns the restored session", async () => {
+    const source = createStore({}, {
+      session: [],
+    })
+    const { unarchiveSession, setActionRefs } = await import("./session-actions")
+    setActionRefs(mockSdk as unknown as OpencodeClient, createChildStores([["/test/project", source]]), () => "/test/project")
+
+    expect(await unarchiveSession("session-a")).toBe(false)
+    expect(globalUpsertedSessions).toEqual([])
+    expect(registeredSessionDirectories).toEqual([])
+  })
+
+  test("sends the archive-clearing sentinel and upserts the restored session after confirmation", async () => {
+    sessionUpdateResult = {
+      data: { id: "session-a", directory: "/test/project", time: { created: 1, archived: 0 } } as Session,
+    }
+    const source = createStore({}, {
+      session: [],
+    })
+    const { unarchiveSession, setActionRefs } = await import("./session-actions")
+    setActionRefs(mockSdk as unknown as OpencodeClient, createChildStores([["/test/project", source]]), () => "/test/project")
+
+    expect(await unarchiveSession("session-a")).toBe(true)
+    // The server cannot clear time.archived over HTTP, so the action must
+    // write the falsy sentinel rather than omitting the field.
+    expect(replyCalls.filter((call) => call.method === "session.update")).toEqual([{
+      method: "session.update",
+      params: { sessionID: "session-a", time: { archived: 0 }, directory: "/test/project" },
+    }])
+    expect((globalUpsertedSessions[0] as Session)?.time?.archived).toBe(0)
+    expect(registeredSessionDirectories).toEqual([{ sessionID: "session-a", directory: "/test/project" }])
+  })
+
+  test("fails when the server keeps the session archived", async () => {
+    sessionUpdateResult = {
+      data: { id: "session-a", directory: "/test/project", time: { created: 1, archived: 2 } } as Session,
+    }
+    const source = createStore({}, {
+      session: [],
+    })
+    const { unarchiveSession, setActionRefs } = await import("./session-actions")
+    setActionRefs(mockSdk as unknown as OpencodeClient, createChildStores([["/test/project", source]]), () => "/test/project")
+
+    // A silent server-side no-op must surface as a failure, not a success toast.
+    expect(await unarchiveSession("session-a")).toBe(false)
+    expect(globalUpsertedSessions).toEqual([])
+    expect(registeredSessionDirectories).toEqual([])
+  })
+
+  test("rejects a restore response that arrives after a runtime switch", async () => {
+    sessionUpdateResult = {
+      data: { id: "session-a", directory: "/test/project", time: { created: 1, archived: 0 } } as Session,
+    }
+    const source = createStore({}, {
+      session: [],
+    })
+    const { getRuntimeKey, switchRuntimeEndpoint } = await import("../lib/runtime-switch")
+    switchRuntimeEndpoint({ apiBaseUrl: "http://restore-runtime-a.test", runtimeKey: "restore-runtime-a" })
+    beforeSessionUpdateResolve = () => {
+      switchRuntimeEndpoint({ apiBaseUrl: "http://restore-runtime-b.test", runtimeKey: "restore-runtime-b" })
+    }
+    const { unarchiveSession, setActionRefs } = await import("./session-actions")
+    setActionRefs(mockSdk as unknown as OpencodeClient, createChildStores([["/test/project", source]]), () => "/test/project")
+
+    expect(await unarchiveSession("session-a")).toBe(false)
+    expect(getRuntimeKey()).toBe("restore-runtime-b")
+    // The stale response must not reconcile the runtime the user switched to.
+    expect(globalUpsertedSessions).toEqual([])
+    expect(registeredSessionDirectories).toEqual([])
+  })
+
+  test("keeps confirmed sessions and fails the rest when the runtime changes mid-batch", async () => {
+    sessionUpdateResult = {
+      data: { id: "session-a", directory: "/test/project", time: { created: 1, archived: 0 } } as Session,
+    }
+    const source = createStore({}, {
+      session: [],
+    })
+    const { switchRuntimeEndpoint } = await import("../lib/runtime-switch")
+    switchRuntimeEndpoint({ apiBaseUrl: "http://restore-batch-a.test", runtimeKey: "restore-batch-a" })
+    beforeSessionUpdateResolve = (sessionId) => {
+      if (sessionId === "session-b") {
+        switchRuntimeEndpoint({ apiBaseUrl: "http://restore-batch-b.test", runtimeKey: "restore-batch-b" })
+      }
+    }
+    const { unarchiveSessions, setActionRefs } = await import("./session-actions")
+    setActionRefs(mockSdk as unknown as OpencodeClient, createChildStores([["/test/project", source]]), () => "/test/project")
+
+    const result = await unarchiveSessions(["session-a", "session-b", "session-c"])
+
+    // session-a was confirmed before the switch and stays restored; session-b's
+    // response is stale and session-c is never attempted, so both are reported
+    // as failures instead of being silently dropped.
+    expect(result).toEqual({ restoredIds: ["session-a"], failedIds: ["session-b", "session-c"] })
+    expect(globalUpsertedSessions).toHaveLength(1)
+    // session-c must not reach the SDK after the runtime changed.
+    expect(replyCalls.filter((call) => call.method === "session.update").map((call) => call.params.sessionID))
+      .toEqual(["session-a", "session-b"])
+  })
+})
+
 describe("fetchMessagesForSession startup race", () => {
   test("does not reject before sync action refs are initialized", async () => {
     const { fetchMessagesForSession } = await import("./session-actions")
diff --git a/packages/ui/src/sync/session-actions.ts b/packages/ui/src/sync/session-actions.ts
index 7e01309b..1b695891 100644
--- a/packages/ui/src/sync/session-actions.ts
+++ b/packages/ui/src/sync/session-actions.ts
@@ -1014,6 +1014,92 @@ export async function archiveSessions(
   return { archivedIds, failedIds }
 }
 
+/**
+ * Sentinel written to `time.archived` when restoring a session.
+ *
+ * The OpenCode server has no HTTP path to clear `time.archived` back to NULL:
+ * `session.update` only applies the field when the payload carries a finite
+ * number (`archived !== undefined`), so omitting the key is a no-op and `null`
+ * is silently ignored. Writing `0` is the only value that makes every reader
+ * treat the session as active again: the UI, the event reducer, and the
+ * OpenCode app/TUI all classify archive state by truthiness of
+ * `time.archived`, and `0` is falsy. The one place that still excludes such a
+ * session is the server's own `time_archived IS NULL` list filter, so the
+ * global session cache loads with the inclusive `archived` flag and splits
+ * client-side instead of relying on that filter (see
+ * `useGlobalSessionsStore.loadSessions`).
+ */
+const UNARCHIVED_TIMESTAMP = 0
+
+/**
+ * Restore one archived session back to the active list.
+ *
+ * Same contract as `archiveSession`: waits for server confirmation before
+ * reconciling stores, and rejects stale runtimes so a response produced by a
+ * previous runtime cannot mutate the current runtime's state. The global
+ * session cache is updated directly (the sidebar reads active/archived
+ * buckets from it); the live directory store is re-populated by the
+ * authoritative `session.updated` event the server publishes for the update.
+ */
+export async function unarchiveSession(sessionId: string, expectedRuntimeKey = getRuntimeKey()): Promise<boolean> {
+  if (isStaleRuntime(expectedRuntimeKey)) return false
+  const sessionDirectory = getSessionDirectory(sessionId)
+  try {
+    const restored = await opencodeClient.updateSession(sessionId, { time: { archived: UNARCHIVED_TIMESTAMP } }, sessionDirectory)
+    if (isStaleRuntime(expectedRuntimeKey)) return false
+    if (!restored) {
+      throw new Error("session.update failed: server did not return the restored session")
+    }
+    if (restored.time?.archived) {
+      throw new Error("session.update failed: server kept the session archived")
+    }
+    useGlobalSessionsStore.getState().upsertSession(restored)
+    if (sessionDirectory) registerSessionDirectory(sessionId, sessionDirectory)
+    return true
+  } catch (error) {
+    console.error("[session-actions] unarchiveSession failed", error)
+    return false
+  }
+}
+
+export type UnarchiveSessionsOptions = {
+  /**
+   * Runtime key captured when the batch was confirmed. When supplied, the batch
+   * stops as soon as the active runtime differs.
+   */
+  expectedRuntimeKey?: string
+}
+
+/**
+ * Restore several archived sessions sequentially, preserving partial results.
+ *
+ * One failed session never blocks or erases the others: it is reported in
+ * `failedIds` while the remaining IDs are still attempted. When
+ * `expectedRuntimeKey` is supplied and the runtime changes mid-batch, the
+ * already-confirmed sessions stay in `restoredIds` and every ID that was not
+ * confirmed on the captured runtime is reported in `failedIds`, so callers keep
+ * showing truthful partial-failure feedback.
+ */
+export async function unarchiveSessions(
+  ids: string[],
+  options?: UnarchiveSessionsOptions,
+): Promise<{ restoredIds: string[]; failedIds: string[] }> {
+  const restoredIds: string[] = []
+  const failedIds: string[] = []
+  const expectedRuntimeKey = options?.expectedRuntimeKey ?? getRuntimeKey()
+
+  for (const [index, id] of ids.entries()) {
+    if (isStaleRuntime(expectedRuntimeKey)) {
+      failedIds.push(...ids.slice(index))
+      break
+    }
+    if (await unarchiveSession(id, expectedRuntimeKey)) restoredIds.push(id)
+    else failedIds.push(id)
+  }
+
+  return { restoredIds, failedIds }
+}
+
 export async function updateSessionTitle(sessionId: string, title: string): Promise<void> {
   const sessionDirectory = getSessionDirectory(sessionId)
   const session = await opencodeClient.updateSession(sessionId, { title }, sessionDirectory)
diff --git a/packages/ui/src/sync/session-ui-store.test.js b/packages/ui/src/sync/session-ui-store.test.js
index d60be0fe..ce4cf88f 100644
--- a/packages/ui/src/sync/session-ui-store.test.js
+++ b/packages/ui/src/sync/session-ui-store.test.js
@@ -483,6 +483,15 @@ describe('archiveSessions option forwarding', () => {
     expect(result).toEqual({ archivedIds: [], failedIds: ['session-x', 'session-y'] });
     expect(updateSessionCalls).toEqual([]);
   });
+
+  test('unarchiveSessions honors expectedRuntimeKey instead of discarding the options object', async () => {
+    const result = await useSessionUIStore.getState().unarchiveSessions(['session-x', 'session-y'], {
+      expectedRuntimeKey: 'runtime-that-is-not-active',
+    });
+
+    expect(result).toEqual({ restoredIds: [], failedIds: ['session-x', 'session-y'] });
+    expect(updateSessionCalls).toEqual([]);
+  });
 });
 
 describe('deleteSessions option forwarding', () => {
diff --git a/packages/ui/src/sync/session-ui-store.ts b/packages/ui/src/sync/session-ui-store.ts
index dbef659c..895f5062 100644
--- a/packages/ui/src/sync/session-ui-store.ts
+++ b/packages/ui/src/sync/session-ui-store.ts
@@ -55,6 +55,8 @@ import {
   deleteSessions as deleteSessionsAction,
   archiveSession as archiveSessionAction,
   archiveSessions as archiveSessionsAction,
+  unarchiveSession as unarchiveSessionAction,
+  unarchiveSessions as unarchiveSessionsAction,
   updateSessionTitle as updateSessionTitleAction,
   shareSession as shareSessionAction,
   unshareSession as unshareSessionAction,
@@ -67,6 +69,7 @@ import {
   type ArchiveSessionsOptions,
   type DeleteSessionOptions,
   type DeleteSessionsOptions,
+  type UnarchiveSessionsOptions,
 } from "./session-actions"
 import { useInputStore, type SyntheticContextPart } from "./input-store"
 import { useSessionGoalArmStore } from "@/stores/useSessionGoalArmStore"
@@ -335,6 +338,8 @@ export type SessionUIState = {
   deleteSessions: (ids: string[], options?: DeleteSessionsOptions) => Promise<{ deletedIds: string[]; failedIds: string[] }>
   archiveSession: (id: string) => Promise<boolean>
   archiveSessions: (ids: string[], options?: ArchiveSessionsOptions) => Promise<{ archivedIds: string[]; failedIds: string[] }>
+  unarchiveSession: (id: string) => Promise<boolean>
+  unarchiveSessions: (ids: string[], options?: UnarchiveSessionsOptions) => Promise<{ restoredIds: string[]; failedIds: string[] }>
   updateSessionTitle: (sessionId: string, title: string) => Promise<void>
   shareSession: (sessionId: string) => Promise<Session | null>
   unshareSession: (sessionId: string) => Promise<Session | null>
@@ -1423,6 +1428,10 @@ export const useSessionUIStore = create<SessionUIState>()((set, get) => ({
 
   archiveSessions: (ids, options) => archiveSessionsAction(ids, options),
 
+  unarchiveSession: (id) => unarchiveSessionAction(id),
+
+  unarchiveSessions: (ids, options) => unarchiveSessionsAction(ids, options),
+
   // ---------------------------------------------------------------------------
   // updateSessionTitle — calls SDK, SSE event updates child store
   // ---------------------------------------------------------------------------