diff --git a/patch_archive_ui.py b/patch_archive_ui.py
new file mode 100644
index 0000000..27baf76
--- /dev/null
+++ b/patch_archive_ui.py
@@ -0,0 +1,259 @@
+#!/usr/bin/env python3
+"""Patch opencode frontend for archive/unarchive UI."""
+
+BASE = '/mnt/NVME/Docker/opencode-build/opencode/packages'
+
+# ── 1. layout.tsx ──────────────────────────────────────────────────────────────
+layout = BASE + '/app/src/pages/layout.tsx'
+c = open(layout).read()
+
+# Add unarchiveSession after archiveSession (right after the closing brace)
+ARCHIVE_END = '''    if (session.id === params.id) {
+      if (nextSession) {
+        navigate(`/${params.dir}/session/${nextSession.id}`)
+      } else {
+        navigate(`/${params.dir}/session`)
+      }
+    }
+  }'''
+
+UNARCHIVE_FN = '''
+
+  async function unarchiveSession(session: Session) {
+    const [, setStore] = globalSync.child(session.directory)
+    await (globalSDK.client.session.update as unknown as Function)({
+      directory: session.directory,
+      sessionID: session.id,
+      time: { archived: null },
+    })
+    setStore(
+      produce((draft) => {
+        const match = Binary.search(draft.session, session.id, (s) => s.id)
+        if (match.found) draft.session.splice(match.index, 1)
+      }),
+    )
+  }'''
+
+assert c.count(ARCHIVE_END) == 1, f'ARCHIVE_END found {c.count(ARCHIVE_END)} times'
+c = c.replace(ARCHIVE_END, ARCHIVE_END + UNARCHIVE_FN, 1)
+
+# Add unarchiveSession to workspaceSidebarCtx
+OLD_CTX1 = '    archiveSession,\n    workspaceName,'
+NEW_CTX1 = '    archiveSession,\n    unarchiveSession,\n    workspaceName,'
+assert c.count(OLD_CTX1) == 1, f'OLD_CTX1 found {c.count(OLD_CTX1)} times'
+c = c.replace(OLD_CTX1, NEW_CTX1, 1)
+
+# Add to projectSidebarCtx.sessionProps
+OLD_CTX2 = '      archiveSession,\n    },\n  }'
+NEW_CTX2 = '      archiveSession,\n      unarchiveSession,\n    },\n  }'
+assert c.count(OLD_CTX2) == 1, f'OLD_CTX2 found {c.count(OLD_CTX2)} times'
+c = c.replace(OLD_CTX2, NEW_CTX2, 1)
+
+open(layout, 'w').write(c)
+print('layout.tsx patched OK')
+
+# ── 2. sidebar-workspace.tsx ───────────────────────────────────────────────────
+sw = BASE + '/app/src/pages/layout/sidebar-workspace.tsx'
+c = open(sw).read()
+
+# Expand solid-js import
+c = c.replace(
+    'import { createEffect, createMemo, For, Show, type Accessor, type JSX } from "solid-js"',
+    'import { createEffect, createMemo, createSignal, For, Show, type Accessor, type JSX } from "solid-js"',
+    1
+)
+
+# Add A to router import
+c = c.replace(
+    'import { useNavigate, useParams } from "@solidjs/router"',
+    'import { A, useNavigate, useParams } from "@solidjs/router"',
+    1
+)
+
+# Add useGlobalSDK import
+c = c.replace(
+    'import { useGlobalSync, useQueryOptions } from "@/context/global-sync"',
+    'import { useGlobalSync, useQueryOptions } from "@/context/global-sync"\nimport { useGlobalSDK } from "@/context/global-sdk"',
+    1
+)
+
+# Add sessionTitle import
+c = c.replace(
+    'import { pathKey } from "@/utils/path-key"',
+    'import { pathKey } from "@/utils/path-key"\nimport { sessionTitle } from "@/utils/session-title"',
+    1
+)
+
+# Add unarchiveSession to WorkspaceSidebarContext type
+c = c.replace(
+    '  archiveSession: (session: Session) => Promise<void>\n  workspaceName:',
+    '  archiveSession: (session: Session) => Promise<void>\n  unarchiveSession: (session: Session) => Promise<void>\n  workspaceName:',
+    1
+)
+
+# Insert ArchivedSessionsSection component before WorkspaceSessionList
+ARCHIVED_COMPONENT = '''const ArchivedSessionsSection = (props: {
+  directory: string
+  slug: Accessor<string>
+  unarchiveSession: (session: Session) => Promise<void>
+  language: ReturnType<typeof useLanguage>
+}): JSX.Element => {
+  const globalSDK = useGlobalSDK()
+  const [open, setOpen] = createSignal(false)
+  const [archived, setArchived] = createSignal<Session[]>([])
+  const [loading, setLoading] = createSignal(false)
+
+  const load = async () => {
+    setLoading(true)
+    try {
+      const result = await (globalSDK.client.session.list as unknown as (
+        q: Record<string, unknown>,
+      ) => Promise<{ data: Session[] }>)({
+        directory: props.directory,
+        archived: "true",
+      })
+      setArchived((result?.data ?? []).filter((s) => !!s.time?.archived))
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <Collapsible
+      variant="ghost"
+      open={open()}
+      onOpenChange={(val) => {
+        setOpen(val)
+        if (val) void load()
+      }}
+    >
+      <Collapsible.Trigger class="flex items-center gap-1 w-full pl-2 py-1 rounded-md hover:bg-surface-raised-base-hover">
+        <Icon name="archive" size="small" class="text-icon-weak shrink-0" />
+        <span class="text-12-medium text-text-weak flex-1 text-left">Archived</span>
+        <Icon
+          name={open() ? "chevron-down" : "chevron-right"}
+          size="small"
+          class="text-icon-weak shrink-0 mr-1"
+        />
+      </Collapsible.Trigger>
+      <Collapsible.Content>
+        <Show when={loading()}>
+          <SessionSkeleton count={2} />
+        </Show>
+        <Show when={!loading() && archived().length === 0 && open()}>
+          <div class="pl-6 py-1 text-12-regular text-text-weak italic">No archived sessions</div>
+        </Show>
+        <For each={archived()}>
+          {(session) => (
+            <div class="group/archived relative w-full min-w-0 rounded-md pl-6 pr-1 flex items-center hover:bg-surface-raised-base-hover">
+              <A
+                href={`/${props.slug()}/session/${session.id}`}
+                class="min-w-0 flex-1 py-1 text-14-regular text-text-weak truncate"
+              >
+                {sessionTitle(session.title)}
+              </A>
+              <div class="shrink-0 opacity-0 group-hover/archived:opacity-100 transition-opacity">
+                <Tooltip value="Unarchive" placement="top">
+                  <IconButton
+                    icon="archive"
+                    variant="ghost"
+                    class="size-6 rounded-md"
+                    aria-label="Unarchive"
+                    onClick={(event) => {
+                      event.preventDefault()
+                      event.stopPropagation()
+                      void props.unarchiveSession(session).then(() => void load())
+                    }}
+                  />
+                </Tooltip>
+              </div>
+            </div>
+          )}
+        </For>
+      </Collapsible.Content>
+    </Collapsible>
+  )
+}
+
+'''
+
+WORKSPACE_SESSION_LIST_MARKER = 'const WorkspaceSessionList = ('
+assert c.count(WORKSPACE_SESSION_LIST_MARKER) == 1
+c = c.replace(WORKSPACE_SESSION_LIST_MARKER, ARCHIVED_COMPONENT + WORKSPACE_SESSION_LIST_MARKER, 1)
+
+# Add ArchivedSessionsSection inside SortableWorkspace Collapsible.Content
+OLD_SORTABLE_CONTENT = '''          <WorkspaceSessionList
+            slug={slug}
+            mobile={props.mobile}
+            ctx={props.ctx}
+            showNew={showNew}
+            loading={loading}
+            sessions={sessions}
+            hasMore={hasMore}
+            loadMore={loadMore}
+            language={language}
+          />
+        </Collapsible.Content>'''
+
+NEW_SORTABLE_CONTENT = '''          <WorkspaceSessionList
+            slug={slug}
+            mobile={props.mobile}
+            ctx={props.ctx}
+            showNew={showNew}
+            loading={loading}
+            sessions={sessions}
+            hasMore={hasMore}
+            loadMore={loadMore}
+            language={language}
+          />
+          <ArchivedSessionsSection
+            directory={props.directory}
+            slug={slug}
+            unarchiveSession={props.ctx.unarchiveSession}
+            language={language}
+          />
+        </Collapsible.Content>'''
+
+assert c.count(OLD_SORTABLE_CONTENT) == 1, f'OLD_SORTABLE_CONTENT found {c.count(OLD_SORTABLE_CONTENT)} times'
+c = c.replace(OLD_SORTABLE_CONTENT, NEW_SORTABLE_CONTENT, 1)
+
+# Add ArchivedSessionsSection inside LocalWorkspace
+OLD_LOCAL_CONTENT = '''      <WorkspaceSessionList
+        slug={slug}
+        mobile={props.mobile}
+        ctx={props.ctx}
+        showNew={() => false}
+        loading={loading}
+        sessions={sessions}
+        hasMore={hasMore}
+        loadMore={loadMore}
+        language={language}
+      />
+    </div>'''
+
+NEW_LOCAL_CONTENT = '''      <WorkspaceSessionList
+        slug={slug}
+        mobile={props.mobile}
+        ctx={props.ctx}
+        showNew={() => false}
+        loading={loading}
+        sessions={sessions}
+        hasMore={hasMore}
+        loadMore={loadMore}
+        language={language}
+      />
+      <ArchivedSessionsSection
+        directory={props.project.worktree}
+        slug={slug}
+        unarchiveSession={props.ctx.unarchiveSession}
+        language={language}
+      />
+    </div>'''
+
+assert c.count(OLD_LOCAL_CONTENT) == 1, f'OLD_LOCAL_CONTENT found {c.count(OLD_LOCAL_CONTENT)} times'
+c = c.replace(OLD_LOCAL_CONTENT, NEW_LOCAL_CONTENT, 1)
+
+open(sw, 'w').write(c)
+print('sidebar-workspace.tsx patched OK')
+
+print('All frontend patches applied!')