diff --git a/docs/superpowers/plans/2026-09-04-frontend.md b/docs/superpowers/plans/2026-09-04-frontend.md
index 2f7b0ce..ec9d70f 100644
--- a/docs/superpowers/plans/2026-09-04-frontend.md
+++ b/docs/superpowers/plans/2026-09-04-frontend.md
@@ -1248,6 +1248,7 @@ function BookCard({
 export default function Shelf() {
   const qc = useQueryClient();
   const nav = useNavigate();
+  const { isAdmin } = useAuth();
   const [lib, setLib] = useState(0); // 0 = 全部库
   const [qRaw, setQRaw] = useState("");
   const [q, setQ] = useState("");
@@ -1301,7 +1302,7 @@ export default function Shelf() {
             <button className={btn} onClick={() => qc.invalidateQueries({ queryKey: ["books"] })}>
               刷新
             </button>
-            {lib > 0 && (
+            {isAdmin && lib > 0 && (
               <button className={btn} disabled={scan.isPending} onClick={() => scan.mutate(lib)}>
                 {scan.isPending ? "扫描中…" : "扫描此库"}
               </button>