diff --git a/web/e2e/document-revision-runtime.spec.ts b/web/e2e/document-revision-runtime.spec.ts
index ba6a2d99..e851e9b5 100644
--- a/web/e2e/document-revision-runtime.spec.ts
+++ b/web/e2e/document-revision-runtime.spec.ts
@@ -1042,7 +1042,16 @@ test.describe.serial('document-revision-runtime UI acceptance', () => {
     logs = [];
     const prompt =
       '请另行生成一份《系统设计输入》受控文档（第二份），不要覆盖上一份需求文档，并给出可打开的交付物。';
+    const taskRunWait = waitForTasksRunsPost(page);
     await sendChat(page, prompt);
+    const taskRes = await taskRunWait;
+    if (taskRes.status() !== 202) {
+      fail(`UI-11 tasks/runs must be HTTP 202, got ${taskRes.status()}`);
+    }
+    const taskBody = taskRes.request().postDataJSON() as { task_key?: string };
+    if (taskBody.task_key !== 'prelim_design') {
+      fail(`UI-11 task_key must be prelim_design, got ${JSON.stringify(taskBody.task_key)}`);
+    }
     await waitForSquadCompletion(page, '系统设计输入');
     const second = await openWorkflowDocByLabel(page, /设计输入|系统设计/);
     secondDocTitle = second.title;