diff --git a/modules/sub_agent/state.py b/modules/sub_agent/state.py
index de168bf..13aafbb 100644
--- a/modules/sub_agent/state.py
+++ b/modules/sub_agent/state.py
@@ -301,6 +301,17 @@ class SubAgentStateMixin:
         task = self.tasks.get(task_id)
         if not task:
             return
+        # 如果 terminate_sub_agent 已把任务标为 terminated，下渗异步任务自然结束时
+        # 不要被“已完成/fulfilled覆盖为failed”值覆盖，否则 task 被碰成 failed 但实际上
+        # 用户手动终止已发生，状态语义错误且“successful=false”。
+        existing_status = task.get("status")
+        if existing_status in TERMINAL_STATUSES.union({"terminated"}):
+            ma_debug(
+                "mark_task_done_skip_already_terminal",
+                task_id=task_id,
+                existing_status=existing_status,
+            )
+            return
         status = "completed" if success else "failed"
         ma_debug(
             "mark_task_done",
diff --git a/modules/sub_agent/task.py b/modules/sub_agent/task.py
index 0b4fcdc..be4bf01 100644
--- a/modules/sub_agent/task.py
+++ b/modules/sub_agent/task.py
@@ -540,8 +540,12 @@ class SubAgentTask:
         usage = None
 
         async for chunk in client.chat(self.messages, tools=tools, stream=True):
-            if self._cancelled:
+            if self._soft_stop:
+                # 软停止：优雅中断当前模型调用，后续由 _run_loop 丢弃半成品并进入 idle
                 break
+            if self._cancelled:
+                # 硬取消：立即抛出 CancelledError，确保不会返回半成品的 tool_calls 继续执行
+                raise asyncio.CancelledError()
             if chunk.get("error"):
                 raise RuntimeError(f"API 调用失败: {chunk.get('error')}")
             choice = (chunk.get("choices") or [{}])[0]
diff --git a/static/src/App.vue b/static/src/App.vue
index da38da0..9f949fa 100644
--- a/static/src/App.vue
+++ b/static/src/App.vue
@@ -63,6 +63,8 @@
           :icon-style="iconStyle"
           :format-time="formatTime"
           :running-tasks="runningWorkspaceTasks"
+          :current-task-in-progress="taskInProgress"
+          :current-conversation-id="currentConversationId"
           :current-workspace-id="currentHostWorkspaceId"
           :display-mode="chatDisplayMode"
           :display-mode-disabled="displayModeSwitchDisabled"
@@ -765,6 +767,8 @@
               :icon-style="iconStyle"
               :format-time="formatTime"
               :running-tasks="runningWorkspaceTasks"
+              :current-task-in-progress="taskInProgress"
+              :current-conversation-id="currentConversationId"
               :current-workspace-id="currentHostWorkspaceId"
               :display-mode="chatDisplayMode"
               :display-mode-disabled="displayModeSwitchDisabled"
diff --git a/static/src/components/sidebar/ConversationSidebar.vue b/static/src/components/sidebar/ConversationSidebar.vue
index f4a1949..d36a848 100644
--- a/static/src/components/sidebar/ConversationSidebar.vue
+++ b/static/src/components/sidebar/ConversationSidebar.vue
@@ -547,6 +547,9 @@ const props = withDefaults(
     hostWorkspaceEnabled?: boolean;
     groupByWorkspace?: boolean;
     versioningHostMode?: boolean;
+    /** 当前会话是否仍在运行（用于标记当前正在查看的对话也显示运行中转圈） */
+    currentTaskInProgress?: boolean;
+    currentConversationId?: string;
   }>(),
   {
     showCollapseButton: true,
@@ -559,7 +562,9 @@ const props = withDefaults(
     workspaceKind: 'workspace',
     hostWorkspaceEnabled: false,
     groupByWorkspace: false,
-    versioningHostMode: false
+    versioningHostMode: false,
+    currentTaskInProgress: false,
+    currentConversationId: ''
   }
 );
 
@@ -890,8 +895,15 @@ const completedConversationIds = computed(
         .filter(Boolean)
     )
 );
-const isConversationActive = (conversationId: string) =>
-  activeConversationIds.value.has(String(conversationId || ''));
+const isConversationActive = (conversationId: string) => {
+  if (activeConversationIds.value.has(String(conversationId || ''))) return true;
+  // 后端 runningTasks 库只跟踪跨工作的任务（当前会话排除了），
+  // 所以当前会话的运行态要单独用 currentTaskInProgress 标记。
+  if (props.currentTaskInProgress && String(conversationId || '') === String(props.currentConversationId || '')) {
+    return true;
+  }
+  return false;
+};
 const isConversationCompleted = (conversationId: string) =>
   completedConversationIds.value.has(String(conversationId || ''));
 const isWorkspaceRunning = (workspaceId: string) =>