diff --git a/web/src/components/Shell.jsx b/web/src/components/Shell.jsx
index a68d047..bafecdb 100644
--- a/web/src/components/Shell.jsx
+++ b/web/src/components/Shell.jsx
@@ -236,6 +236,9 @@ function connectWebSocket(term, fitAddon, initPayload, onStateChange, onFirstMes
 }
 
 export default function Shell({ api }) {
+  const MAX_TABS = 7
+  const TABS_STORAGE_KEY = 'muyue_shell_tabs'
+  const TERMINAL_BUFFER_KEY = 'muyue_terminal_buffers'
   const { t } = useI18n()
   const tabsRef = useRef({})
   const nextIdRef = useRef(1)