diff --git a/docs/【编辑器】画布Agent对话面板-2026-07-03.md b/docs/【编辑器】画布Agent对话面板-2026-07-03.md
index aa00c6f9e..526d9c791 100644
--- a/docs/【编辑器】画布Agent对话面板-2026-07-03.md
+++ b/docs/【编辑器】画布Agent对话面板-2026-07-03.md
@@ -60,6 +60,7 @@
 - 对话框与左侧素材 / 图层侧栏**不互斥**，允许同时展开，便于在对话中选取和核对画布素材；左侧栏切换不改变 Agent 面板开关状态。
 - 桌面端对话框固定宽约 360–400px；移动端抽屉式全宽覆盖；收起态为胶囊/圆形入口按钮。
 - 会话管理入口在对话框头部：当前会话标题 + 历史会话下拉（按更新时间倒序）+ 新建对话按钮，全部包在对话框内。
+- 快速切换会话或会话轮询刷新产生并发详情请求时，前端只允许最后发起的请求更新当前会话、消息、错误和加载态；旧响应不得覆盖用户最新选择。
 - 收起对话框只是隐藏面板，不卸载当前会话 hook；普通 JSON 消息请求的等待态和外部生成任务状态必须在收起 / 重新打开之间保持一致。
 
 ## 附件
diff --git a/src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx b/src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx
new file mode 100644
index 000000000..257892551
--- /dev/null
+++ b/src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx
@@ -0,0 +1,53 @@
+/* @vitest-environment jsdom */
+
+import { render, screen } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+
+import type { EditorAgentMessage } from '@/packages/shared/src/contracts';
+
+import { MessageBubble } from './MessageBubble.tsx';
+
+function renderMessage(message: EditorAgentMessage) {
+  return render(
+    <MessageBubble
+      message={message}
+      busyAction={null}
+      onConfirmToolCall={vi.fn()}
+      onCancelToolCall={vi.fn()}
+    />,
+  );
+}
+
+describe('MessageBubble', () => {
+  it('shows prefixed system errors as red Agent errors without the wire prefix', () => {
+    renderMessage({
+      id: 2,
+      role: 'system',
+      text: 'ERROR planning failed',
+      attachments: [],
+      toolCall: null,
+      createdAt: '2026-07-16T00:00:00Z',
+    });
+
+    const error = screen.getByLabelText('Agent错误');
+    expect(error.textContent).toContain('planning failed');
+    expect(error.textContent).not.toContain('ERROR');
+    expect(error.firstElementChild?.classList.contains('bg-red-50')).toBe(true);
+    expect(error.firstElementChild?.classList.contains('text-red-700')).toBe(
+      true,
+    );
+  });
+
+  it('continues to hide internal system messages without the error prefix', () => {
+    const { container } = renderMessage({
+      id: 3,
+      role: 'system',
+      text: 'internal attachment bookkeeping',
+      attachments: [],
+      toolCall: null,
+      createdAt: '2026-07-16T00:00:00Z',
+    });
+
+    expect(container.childElementCount).toBe(0);
+  });
+});
diff --git a/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.test.tsx b/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.test.tsx
index 45d4b07ae..f7e8730d4 100644
--- a/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.test.tsx
+++ b/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.test.tsx
@@ -4,6 +4,7 @@ import { act, renderHook, waitFor } from '@testing-library/react';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 
 import type {
+  EditorAgentConversationDetail,
   EditorAgentMessage,
   EditorAgentMessageResponse,
 } from '../../../../packages/shared/src/contracts/editorAgent.ts';
@@ -173,6 +174,93 @@ describe('useEditorAgentConversation', () => {
     );
   });
 
+  it('keeps the latest conversation when detail responses arrive out of order', async () => {
+    const client = createClient();
+    let resolveConversation2!: (detail: EditorAgentConversationDetail) => void;
+    let resolveConversation3!: (detail: EditorAgentConversationDetail) => void;
+    const conversation2Promise = new Promise<EditorAgentConversationDetail>(
+      (resolve) => {
+        resolveConversation2 = resolve;
+      },
+    );
+    const conversation3Promise = new Promise<EditorAgentConversationDetail>(
+      (resolve) => {
+        resolveConversation3 = resolve;
+      },
+    );
+    const { result } = renderHook(() =>
+      useEditorAgentConversation({ projectId: 'project-1', client }),
+    );
+
+    await waitFor(() => {
+      expect(result.current.activeConversationId).toBe('conversation-1');
+    });
+    vi.mocked(client.getConversation).mockImplementation((conversationId) => {
+      if (conversationId === 'conversation-2') {
+        return conversation2Promise;
+      }
+      if (conversationId === 'conversation-3') {
+        return conversation3Promise;
+      }
+      throw new Error(`Unexpected conversation: ${conversationId}`);
+    });
+
+    let conversation2Load!: Promise<EditorAgentConversationDetail | null>;
+    let conversation3Load!: Promise<EditorAgentConversationDetail | null>;
+    act(() => {
+      conversation2Load = result.current.selectConversation('conversation-2');
+      conversation3Load = result.current.selectConversation('conversation-3');
+    });
+
+    await act(async () => {
+      resolveConversation3({
+        conversationId: 'conversation-3',
+        projectId: 'project-1',
+        title: '第三个会话',
+        messages: [
+          {
+            id: 3,
+            role: 'assistant',
+            text: '第三个会话消息',
+            attachments: [],
+            toolCall: null,
+            createdAt: '2026-07-03T00:03:00.000Z',
+          },
+        ],
+        createdAt: '2026-07-03T00:03:00.000Z',
+        updatedAt: '2026-07-03T00:03:00.000Z',
+      });
+      await conversation3Load;
+    });
+    expect(result.current.activeConversationId).toBe('conversation-3');
+    expect(result.current.messages[0]?.text).toBe('第三个会话消息');
+    expect(result.current.isLoadingMessages).toBe(false);
+
+    await act(async () => {
+      resolveConversation2({
+        conversationId: 'conversation-2',
+        projectId: 'project-1',
+        title: '第二个会话',
+        messages: [
+          {
+            id: 2,
+            role: 'assistant',
+            text: '第二个会话消息',
+            attachments: [],
+            toolCall: null,
+            createdAt: '2026-07-03T00:02:00.000Z',
+          },
+        ],
+        createdAt: '2026-07-03T00:02:00.000Z',
+        updatedAt: '2026-07-03T00:02:00.000Z',
+      });
+      await conversation2Load;
+    });
+    expect(result.current.activeConversationId).toBe('conversation-3');
+    expect(result.current.messages[0]?.text).toBe('第三个会话消息');
+    expect(result.current.isLoadingMessages).toBe(false);
+  });
+
   it('appends a lazily reconciled tool message delta', async () => {
     const client = createClient();
     const pendingMessage: EditorAgentMessage = {
diff --git a/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts b/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts
index ed18503ad..747dbf69e 100644
--- a/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts
+++ b/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts
@@ -170,6 +170,7 @@ export function useEditorAgentConversation({
   const activeRequestAbortControllerRef = useRef<AbortController | null>(null);
   const activeConversationIdRef = useRef<string | null>(null);
   const activeToolCallActionRef = useRef<EditorAgentToolCallActionState>(null);
+  const conversationLoadRequestIdRef = useRef(0);
 
   useEffect(() => {
     activeConversationIdRef.current = activeConversationId;
@@ -205,6 +206,8 @@ export function useEditorAgentConversation({
       conversationId: string,
       options: { showLoading?: boolean } = {},
     ) => {
+      const requestId = conversationLoadRequestIdRef.current + 1;
+      conversationLoadRequestIdRef.current = requestId;
       const showLoading = options.showLoading ?? true;
       if (showLoading) {
         setIsLoadingMessages(true);
@@ -212,15 +215,19 @@ export function useEditorAgentConversation({
       setErrorMessage(null);
       try {
         const detail = await client.getConversation(conversationId);
-        applyConversationDetail(detail);
+        if (conversationLoadRequestIdRef.current === requestId) {
+          applyConversationDetail(detail);
+        }
         return detail;
       } catch (error) {
-        setErrorMessage(
-          error instanceof Error ? error.message : '读取画布 Agent 会话失败',
-        );
+        if (conversationLoadRequestIdRef.current === requestId) {
+          setErrorMessage(
+            error instanceof Error ? error.message : '读取画布 Agent 会话失败',
+          );
+        }
         throw error;
       } finally {
-        if (showLoading) {
+        if (conversationLoadRequestIdRef.current === requestId) {
           setIsLoadingMessages(false);
         }
       }
@@ -229,6 +236,8 @@ export function useEditorAgentConversation({
   );
 
   useEffect(() => {
+    conversationLoadRequestIdRef.current += 1;
+    setIsLoadingMessages(false);
     if (!normalizedProjectId) {
       setConversations([]);
       setActiveConversationId(null);