diff --git a/src/components/ai/MessageList.vue b/src/components/ai/MessageList.vue
index edc7f87..638d867 100644
--- a/src/components/ai/MessageList.vue
+++ b/src/components/ai/MessageList.vue
@@ -1026,7 +1026,10 @@ function stepText(s: TurnCallStats, round: number): string {
   if (done > 0) parts.push(t('ai.trace.stepDone', { n: done }))
   if (s.fail > 0) parts.push(t('ai.trace.fail', { n: s.fail }))
   if (s.rejected > 0) parts.push(t('ai.trace.rejected', { n: s.rejected }))
+  // 即时摘要(U2 同口径):工具执行中显「正在 {工具}」;工具间隙(LLM 写正文/思考)显
+  // 「生成回复中」——折叠卡头任何时刻都有「现在在干什么」,消除无工具期的静默观感
   if (s.running > 0 && s.runningName) parts.push(t('ai.trace.stepRunning', { name: s.runningName }))
+  else parts.push(t('ai.trace.generating'))
   if (s.pending > 0) parts.push(t('ai.trace.stepPending', { n: s.pending }))
   return parts.join(' · ') || t('ai.trace.processOnly')
 }
diff --git a/src/i18n/en/ai.ts b/src/i18n/en/ai.ts
index 372ceb3..c47db70 100644
--- a/src/i18n/en/ai.ts
+++ b/src/i18n/en/ai.ts
@@ -87,6 +87,7 @@ export default {
       roundN: 'Round {n}',
       processOnly: 'Process log',
       compressed: 'Context summary',
+      generating: 'Composing reply',
       running: 'Running',
       taskRef: 'Related task: {name}',
       stepDone: '✓ {n} calls done',
diff --git a/src/i18n/zh-CN/ai.ts b/src/i18n/zh-CN/ai.ts
index c0f16e3..ccd4566 100644
--- a/src/i18n/zh-CN/ai.ts
+++ b/src/i18n/zh-CN/ai.ts
@@ -87,6 +87,7 @@ export default {
       roundN: '第 {n} 轮',
       processOnly: '过程记录',
       compressed: '压缩摘要',
+      generating: '生成回复中',
       running: '进行中',
       taskRef: '关联任务:{name}',
       stepDone: '✓ {n} 次调用完成',