diff --git a/frontend/tests/e2e/artifacts-and-thread-reuse.spec.ts b/frontend/tests/e2e/artifacts-and-thread-reuse.spec.ts
index 739f1af5..b72ab576 100644
--- a/frontend/tests/e2e/artifacts-and-thread-reuse.spec.ts
+++ b/frontend/tests/e2e/artifacts-and-thread-reuse.spec.ts
@@ -1,11 +1,13 @@
 import { expect, test } from "@playwright/test";
 
 import {
+  PRIMARY_THREAD_ID,
   THREAD_WITH_ARTIFACTS,
   THREAD_WITH_HTML_ARTIFACT,
   THREAD_WITH_IMAGE_ARTIFACT,
   openChat,
   reuseThreadChatEntry,
+  sendMessage,
   skipIfMissingThread,
   waitForAnyMessages,
   waitForMessageListReady,
@@ -87,8 +89,22 @@ test.describe("聊天工作台 / Artifact 面板", () => {
       (await htmlFile.count()) === 0,
       "当前线程没有 HTML artifact。",
     );
+
+    const htmlArtifactResponsePromise = page.waitForResponse((response) => {
+      const url = decodeURIComponent(response.url());
+      return (
+        response.status() === 200 &&
+        /\/api\/threads\/[^/]+\/artifacts\//.test(url) &&
+        /\.html?($|\?)/i.test(url)
+      );
+    });
+
     await htmlFile.click();
 
+    const htmlArtifactResponse = await htmlArtifactResponsePromise;
+    expect(htmlArtifactResponse.headers()["content-disposition"] ?? "").toContain(
+      "attachment;",
+    );
     await expect(page.getByTitle(/Artifact preview(?::.*)?$/i)).toBeVisible();
   });
 
@@ -117,4 +133,32 @@ test.describe("聊天工作台 / Artifact 面板", () => {
     await expect(page.getByTestId("artifacts-open-button")).toBeVisible();
     await expect(page.getByRole("log").first()).toBeVisible();
   });
+
+  test("DF-ART-005 生成简单 HTML 后出现 artifact-file-card", async ({
+    page,
+  }, testInfo) => {
+    test.setTimeout(180_000);
+    skipIfMissingThread(testInfo, PRIMARY_THREAD_ID, "FRONTEND_E2E_THREAD_ID");
+
+    await openChat(page, reuseThreadChatEntry(PRIMARY_THREAD_ID!));
+    await waitForMessageListReady(page, { requireMessages: false });
+
+    await sendMessage(page, "生成一个简单的html文件");
+
+    await expect
+      .poll(
+        async () => await page.getByTestId("artifacts-open-button").count(),
+        { timeout: 120_000 },
+      )
+      .toBeGreaterThan(0);
+
+    await page.getByTestId("artifacts-open-button").click();
+
+    await expect
+      .poll(
+        async () => await page.getByTestId("artifact-file-card").count(),
+        { timeout: 30_000 },
+      )
+      .toBeGreaterThan(0);
+  });
 });