diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectConversation.test.tsx b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectConversation.test.tsx
index a85c6a51a..3dc7c91b2 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectConversation.test.tsx
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectConversation.test.tsx
@@ -136,6 +136,25 @@ describe('更早历史的入口', () => {
     fireEvent.click(view.getByText('重试'));
     expect(retry).toHaveBeenCalledTimes(1);
   });
+
+  it('断言式 live region 里不放可交互控件：重试按钮是 alert 之外的兄弟', () => {
+    const retry = vi.fn();
+    const view = renderConversation({
+      historyHasMore: true,
+      historyError: '读取更早的对话历史失败',
+      onRetryEarlierHistory: retry,
+    });
+
+    // `role="alert"` 隐含 aria-live="assertive" + aria-atomic="true"：整段会被当成一条断言性
+    // 播报，交互控件嵌在里面既可能不被读屏当成可聚焦按钮，点击也落在 live region 内部。
+    const alert = view.getByRole('alert');
+    expect(alert.textContent).toContain('加载更早对话失败');
+    expect(alert.contains(view.getByText('重试'))).toBe(false);
+
+    // 拆开之后仍在同一行里，重试仍是唯一的手动出路。
+    fireEvent.click(view.getByText('重试'));
+    expect(retry).toHaveBeenCalledTimes(1);
+  });
 });
 
 describe('前插锚点的标记', () => {
diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectHistoryRow.tsx b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectHistoryRow.tsx
index 66672ce56..8e00c099c 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectHistoryRow.tsx
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/DirectProjectHistoryRow.tsx
@@ -37,11 +37,10 @@ export function DirectProjectHistoryErrorRow({
   onRetry: () => void;
 }) {
   return (
-    <p
-      className="flex items-center justify-center gap-2 py-2 text-xs text-[color:var(--platform-button-danger-text)]"
-      role="alert"
-    >
-      {HISTORY_ERROR_TEXT}
+    <div className="flex items-center justify-center gap-2 py-2 text-xs text-[color:var(--platform-button-danger-text)]">
+      {/* `role="alert"` 隐含 assertive + atomic：只有文案本身进 live region，重试按钮留在外面，
+          否则整段会被当成一条断言性播报，可聚焦控件也被卷进 live region 内部。 */}
+      <span role="alert">{HISTORY_ERROR_TEXT}</span>
       <button
         type="button"
         className="rounded-full border border-[color:var(--platform-subpanel-border)] px-2 py-0.5 text-xs text-[color:var(--platform-text-strong)] transition hover:bg-[var(--platform-neutral-bg)]"
@@ -49,6 +48,6 @@ export function DirectProjectHistoryErrorRow({
       >
         {HISTORY_RETRY_TEXT}
       </button>
-    </p>
+    </div>
   );
 }
diff --git a/docs/adr/【ADR】DirectProject对话滚动与历史自动加载-2026-10-02.md b/docs/adr/【ADR】DirectProject对话滚动与历史自动加载-2026-10-02.md
index e450c4f8b..3065b8b6b 100644
--- a/docs/adr/【ADR】DirectProject对话滚动与历史自动加载-2026-10-02.md
+++ b/docs/adr/【ADR】DirectProject对话滚动与历史自动加载-2026-10-02.md
@@ -21,7 +21,7 @@ DirectProject 聊天区（`apps/ai-game-creator-shell/src/view/project-developme
 - 触发二（填充视口）：首帧之后内容填不满视口（`scrollHeight <= clientHeight`）时继续加载，直到填满或 `hasMore=false`；不允许出现「历史比视口短、又没有按钮」的死局。
 - 两个触发都不越过既有的首屏订阅锚点 `lastCompletedItemId`；一次加载仍最多连拉 5 页（口径见 [`【ADR】DirectProject对话历史单一事实源-2026-09-16`](./【ADR】DirectProject对话历史单一事实源-2026-09-16.md)）。
 - 加载中在列表最上方（比最旧一条回合更靠上）挂载一行 `role="status"`、`aria-live="polite"` 的「正在加载更早的对话」，带旋转圈；延迟 150ms 才显示，加载结束即卸载。它按需挂载，靠位置补偿（见第 2 条）保证下面的消息不跳。
-- 失败：挂起自动加载，列表顶部保留一行 `role="alert"` 的「加载更早对话失败 · 重试」，重试是可聚焦按钮；**不自动重试**，只有点重试（或切换项目）才重新开始；重试成功后错误行消失。
+- 失败：挂起自动加载，列表顶部保留一行内联错误行——`role="alert"` 只包住「加载更早对话失败」文案本身，重试是可聚焦按钮、留在 live region 之外（assertive + atomic 的 live region 里不放交互控件）；**不自动重试**，只有点重试（或切换项目）才重新开始；重试成功后错误行消失。
 - 一次加载与它所属的**世代**绑定：切换项目或新起一次读取都推进世代号（`historyLoadTokenRef`），旧世代落地时整段失效——不合并条目、不写游标、不关加载态。只比项目路径不够：A→B→A 之后在飞的旧读取又落回同一个路径，原守卫放行，会把新一代的加载行与 `historyLoadingRef` 这道并发闸门一起改掉。
 
 ### 2. 前插锚定：回合 key + 块身份 + 偏移，关掉浏览器原生锚定