diff --git a/ui/src/conversation-panel/components/content/items/group/index.vue b/ui/src/conversation-panel/components/content/items/group/index.vue
index a669eb7d669..913f06f5fdc 100644
--- a/ui/src/conversation-panel/components/content/items/group/index.vue
+++ b/ui/src/conversation-panel/components/content/items/group/index.vue
@@ -78,7 +78,7 @@ const currentActivity = computed(() => {
     <template #label>
       <span v-if="content.status === 'RUNNING'" class="mk-conversation-loading" />
       <span class="min-w-0 max-w-[300px] truncate" :title="content.name">{{ content.name }}</span>
-      <span v-if="!isExpanded && currentActivity" class="min-w-0 truncate" :title="currentActivity">{{ currentActivity }}</span>
+      <!-- <span v-if="!isExpanded && currentActivity" class="min-w-0 truncate" :title="currentActivity">{{ currentActivity }}</span> -->
       <el-tag v-if="isFailed" size="small" :type="statusType">{{ statusText }}</el-tag>
     </template>
 
diff --git a/ui/src/workflow-canvas/ai-generate/panel/activity.ts b/ui/src/workflow-canvas/ai-generate/panel/activity.ts
index 907db59f3f3..ff813b3c722 100644
--- a/ui/src/workflow-canvas/ai-generate/panel/activity.ts
+++ b/ui/src/workflow-canvas/ai-generate/panel/activity.ts
@@ -185,7 +185,8 @@ export function createActivity() {
       }
       last.text += event.delta
       emit(scopeKey, { type, id: last.id, content: event.delta, ...(type === 'REASONING' ? { status: 'RUNNING' } : {}) })
-      lastActivity.value = tail(last.text)
+      // lastActivity.value = tail(last.text)
+      lastActivity.value = event.type === 'reasoning' ? tail(last.text) : ''
     } else if (event.type === 'tool_start') {
       settle(scopeKey)
       const delegate = DELEGATE_TOOLS.has(event.name)
@@ -206,9 +207,7 @@ export function createActivity() {
       const name = toolTitle(toolCall)
       emit(
         toolCall.scopeKey,
-        toolCall.delegate
-          ? { type: 'GROUP', id: toolCall.contentId, name }
-          : { type: 'TOOL', id: toolCall.contentId, name, arguments: event.delta },
+        toolCall.delegate ? { type: 'GROUP', id: toolCall.contentId, name } : { type: 'TOOL', id: toolCall.contentId, name, arguments: event.delta },
       )
     } else if (event.type === 'tool_end') {
       const toolCall = toolCallById.get(event.id)