diff --git a/backend/my_work/agents/time.go b/backend/my_work/agents/time.go
index a02e3a9..18a6927 100644
--- a/backend/my_work/agents/time.go
+++ b/backend/my_work/agents/time.go
@@ -70,16 +70,29 @@ func buildTimeContext(now time.Time) string {
 - 本周：%s 至 %s
 - 本月：%s 至 %s
 - 今年：%s 至 %s`,
-		now.Format("2006-01-02 15:04:05 MST"),
-		todayStart.Format("2006-01-02"), todayStart.Format("2006-01-02 15:04:05"), todayStart.AddDate(0, 0, 1).Add(-time.Second).Format("2006-01-02 15:04:05"),
-		todayStart.AddDate(0, 0, -1).Format("2006-01-02"),
-		todayStart.AddDate(0, 0, 1).Format("2006-01-02"),
-		weekStart.Format("2006-01-02"), weekStart.AddDate(0, 0, 7).Add(-time.Second).Format("2006-01-02"),
-		monthStart.Format("2006-01-02"), monthStart.AddDate(0, 1, 0).Add(-time.Second).Format("2006-01-02"),
-		yearStart.Format("2006-01-02"), yearStart.AddDate(1, 0, 0).Add(-time.Second).Format("2006-01-02"),
+		formatDateTimeWithWeek(now, "2006-01-02 15:04:05 MST"),
+		formatDateWithWeek(todayStart), formatDateTimeWithWeek(todayStart, "2006-01-02 15:04:05"), formatDateTimeWithWeek(todayStart.AddDate(0, 0, 1).Add(-time.Second), "2006-01-02 15:04:05"),
+		formatDateWithWeek(todayStart.AddDate(0, 0, -1)),
+		formatDateWithWeek(todayStart.AddDate(0, 0, 1)),
+		formatDateWithWeek(weekStart), formatDateWithWeek(weekStart.AddDate(0, 0, 7).Add(-time.Second)),
+		formatDateWithWeek(monthStart), formatDateWithWeek(monthStart.AddDate(0, 1, 0).Add(-time.Second)),
+		formatDateWithWeek(yearStart), formatDateWithWeek(yearStart.AddDate(1, 0, 0).Add(-time.Second)),
 	)
 }
 
+func formatDateWithWeek(t time.Time) string {
+	return formatDateTimeWithWeek(t, "2006-01-02")
+}
+
+func formatDateTimeWithWeek(t time.Time, layout string) string {
+	return fmt.Sprintf("%s（%s）", t.Format(layout), weekdayName(t.Weekday()))
+}
+
+func weekdayName(weekday time.Weekday) string {
+	names := []string{"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"}
+	return names[weekday]
+}
+
 func dateStart(t time.Time) time.Time {
 	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
 }
diff --git a/frontend/ops_vue_js/src/components/AppHeader.vue b/frontend/ops_vue_js/src/components/AppHeader.vue
index e7428ed..c634eb1 100644
--- a/frontend/ops_vue_js/src/components/AppHeader.vue
+++ b/frontend/ops_vue_js/src/components/AppHeader.vue
@@ -52,13 +52,14 @@ const activeClass = "bg-blue-50 text-blue-600 dark:bg-dk-card dark:text-blue-400
 const normalClass = "rounded-md px-3 py-2 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900 dark:text-dk-subtle dark:hover:bg-dk-card dark:hover:text-dk-text";
 
 const navItems = computed(() => [
+  { label: t("appname.aichat"), to: "/aichat" },
   { label: t("appname.home"), to: "/" },
   // { label: t("appname.schedule"), to: "/schedule" },
   { label: t("appname.calendar"), to: "/calendars" },
   { label: t("appname.purchase"), to: "/purchase" },
   { label: t("appname.work_order"), to: "/work_order" },
   { label: t("appname.warehouse"), to: "/warehouse" },
-  { label: t("appname.aichat"), to: "/aichat" },
+  
 ]);
 </script>
 
diff --git a/frontend/ops_vue_js/src/i18n/en.json b/frontend/ops_vue_js/src/i18n/en.json
index 82922a2..819333c 100644
--- a/frontend/ops_vue_js/src/i18n/en.json
+++ b/frontend/ops_vue_js/src/i18n/en.json
@@ -37,11 +37,11 @@
     "warehouse_items": "Items Overview",
     "work_order": "Work Order",
     "calendar": "Calendar",
-    "aichat": "AI Chat"
+    "aichat": "AI Assistant"
   },
   "aichat": {
-    "title": "AI Chat",
-    "subtitle": "Chat with the AI assistant using streaming responses and backend tool traces.",
+    "title": "AI Assistant",
+    "subtitle": "Chat with the AI assistant using streaming responses.",
     "empty_title": "Start an AI chat",
     "empty_hint": "Type a question and press Enter to send. Use Shift + Enter for a new line.",
     "input_placeholder": "Type a message...",
diff --git a/frontend/ops_vue_js/src/i18n/zh-CN.json b/frontend/ops_vue_js/src/i18n/zh-CN.json
index 33c39d9..6f6b015 100644
--- a/frontend/ops_vue_js/src/i18n/zh-CN.json
+++ b/frontend/ops_vue_js/src/i18n/zh-CN.json
@@ -37,11 +37,11 @@
     "warehouse_items": "物品总览",
     "work_order": "工单",
     "calendar": "日历",
-    "aichat": "AI 对话"
+    "aichat": "AI 助手"
   },
   "aichat": {
-    "title": "AI 对话",
-    "subtitle": "通过流式响应与 AI 助手对话，可显示后端工具执行过程。",
+    "title": "AI 助手",
+    "subtitle": "通过流式响应与 AI 助手对话。",
     "empty_title": "开始一次 AI 对话",
     "empty_hint": "输入问题后按 Enter 发送，Shift + Enter 换行。",
     "input_placeholder": "输入消息...",
diff --git a/frontend/ops_vue_js/src/views/aichat/AiChatView.vue b/frontend/ops_vue_js/src/views/aichat/AiChatView.vue
index bc7920b..d479444 100644
--- a/frontend/ops_vue_js/src/views/aichat/AiChatView.vue
+++ b/frontend/ops_vue_js/src/views/aichat/AiChatView.vue
@@ -24,9 +24,9 @@ const inputText = ref('')
 const selectedImage = ref(null)
 const pending = ref(false)
 const traces = ref([])
-const tracesCollapsed = ref(false)
+const tracesCollapsed = ref(true)
 const reasoning = ref('')
-const reasoningCollapsed = ref(false)
+const reasoningCollapsed = ref(true)
 const stats = ref(null)
 const profiles = ref([])
 const activeProfile = ref('')
@@ -278,9 +278,9 @@ function bindServerConversation(conversation) {
 
 function resetStreamDetails() {
   traces.value = []
-  tracesCollapsed.value = false
+  tracesCollapsed.value = true
   reasoning.value = ''
-  reasoningCollapsed.value = false
+  reasoningCollapsed.value = true
   stats.value = null
   clearSelectedImage()
 }
@@ -473,9 +473,9 @@ async function sendMessage() {
   inputText.value = ''
   clearSelectedImage()
   traces.value = []
-  tracesCollapsed.value = false
+  tracesCollapsed.value = true
   reasoning.value = ''
-  reasoningCollapsed.value = false
+  reasoningCollapsed.value = true
   stats.value = null
 
   const userMessage = { role: 'user', content: text }