diff --git a/apps/wiki/scripts/smoke.mjs b/apps/wiki/scripts/smoke.mjs
index 1059d43..cdd04e7 100644
--- a/apps/wiki/scripts/smoke.mjs
+++ b/apps/wiki/scripts/smoke.mjs
@@ -39,7 +39,7 @@ try {
   const indexText=await indexResponse.text();
   const id=indexText.match(/\/explore\/([a-f0-9]{24})/)?.[1];assert.ok(id);
   const agent=await fetch(`http://127.0.0.1:${port}/explore/${id}?agent_mode=True`);
-  assert.equal(agent.status,200);assert.match(agent.headers.get('content-type'),/text\/plain/);assert.ok(!(await agent.text()).includes('<html'));
+  assert.equal(agent.status,200);assert.match(agent.headers.get('content-type'),/text\/plain/);const agentText=await agent.text();assert.match(agentText,/^# /);assert.doesNotMatch(agentText,/^\s*(?:<!doctype html|<html)/i);
   const preview=await fetch(`http://127.0.0.1:${port}/api/preview?source=${encodeURIComponent('/skills/shadow-puppet/egret-example.png')}&width=480`);
   assert.equal(preview.status,200);assert.match(preview.headers.get('content-type'),/image\/webp/);assert.ok((await preview.arrayBuffer()).byteLength<=100000);
   console.log("Production smoke test passed");
diff --git a/apps/wiki/tests/explore.test.ts b/apps/wiki/tests/explore.test.ts
index 5eca14a..29230f9 100644
--- a/apps/wiki/tests/explore.test.ts
+++ b/apps/wiki/tests/explore.test.ts
@@ -15,3 +15,16 @@ test('independent notes expose their own description, tags and complete image co
  const workflow=(await getEntry(pageId('guidance:shadow-puppet/workflow')))!;
  assert.notEqual(workflow.description,note.description);assert.notEqual(workflow.id,note.id);
 });
+
+test('agent text preserves tutorial HTML and TSX code without returning an HTML page',async()=>{
+ const entry=(await getEntry(pageId('guidance:premium-layout/offset-panels')))!;
+ let body='';const headers:Record<string,string>={};
+ const response={setHeader:(k:string,v:string)=>headers[k]=v,end:(value:string)=>{body=value}};
+ await getServerSideProps({params:{id:entry.id},query:{agent_mode:'True'},res:response,req:{method:'GET'}} as never);
+ assert.match(headers['Content-Type'],/text\/plain/);
+ assert.ok(body.startsWith('# '+entry.title));
+ assert.match(body,/```\n<!doctype html>\n<html lang="zh-CN">/);
+ assert.ok(body.includes('export default function LayoutPoster'));
+ assert.ok(body.includes('app/designs/offset-panels/page.tsx'));
+ assert.equal(body,entryText(entry));
+});
diff --git a/docs/premium-layouts.md b/docs/premium-layouts.md
index 708299d..5189a27 100644
--- a/docs/premium-layouts.md
+++ b/docs/premium-layouts.md
@@ -10,6 +10,8 @@
 - `apps/wiki/src/content/page-ids.json`：为 13 篇文档持久保存独立 ID，标题与排序变化不改变地址。
 - `apps/wiki/scripts/generate-layout-recipes.ts`：重新生成独立 HTML 演示和 PNG 结构封面，无第三方素材和浏览器依赖。
 - `apps/wiki/public/layout-recipes/router.png`：12 套构图的总览封面。
+- `apps/wiki/scripts/smoke.mjs`：以响应类型与 Markdown 开头检查纯文本，允许教程代码块合法包含 HTML。
+- `apps/wiki/tests/explore.test.ts`：新增回归检查，确保 agent 模式原样保留 HTML 与 TSX 代码示例。
 - `docs/premium-layouts.md`：内容入口、文件职责、重建与验证说明（本文）。
 
 以下每个文件基名各对应 `.html` 与 `.png` 两个文件，全部位于 `apps/wiki/public/layout-recipes/`。HTML 为实际可运行示例；PNG 是独立绘制的结构示意，明确标注并非代码截图。