diff --git a/lib/exporter/extras.ts b/lib/exporter/extras.ts
index a29b7fa..e112772 100644
--- a/lib/exporter/extras.ts
+++ b/lib/exporter/extras.ts
@@ -6,6 +6,24 @@ export function buildExtrasForPage(page: Page): Record<string, Uint8Array> {
   const extras: Record<string, Uint8Array> = {}
   const te = new TextEncoder()
 
+  // Always provide a baseline robots.txt
+  const robots = `User-agent: *\nDisallow:`
+  extras['robots.txt'] = te.encode(robots)
+
+  // Provide a minimal site.webmanifest derived from Page
+  try {
+    const name = page.title || 'App'
+    const short = name.length > 12 ? name.slice(0, 12) : name
+    const manifest = {
+      name,
+      short_name: short,
+      start_url: '/',
+      display: 'standalone',
+      theme_color: page.theme?.primaryColor ?? '#000000',
+    }
+    extras['site.webmanifest'] = te.encode(JSON.stringify(manifest))
+  } catch {}
+
   const hasAction = !!(page.form?.actionUrl && page.form.actionUrl.trim().length > 0)
   if (!hasAction) {
     const code = `// Google Apps Script (Code.gs)
diff --git a/lib/exporter/manifest.robots.auto.test.ts b/lib/exporter/manifest.robots.auto.test.ts
new file mode 100644
index 0000000..faeeee4
--- /dev/null
+++ b/lib/exporter/manifest.robots.auto.test.ts
@@ -0,0 +1,37 @@
+import { describe, it, expect } from 'vitest'
+import { pageSchema, type Page } from '@/lib/schema/page'
+import { buildExtrasForPage } from '@/lib/exporter/extras'
+
+function makePage(overrides: Partial<Page> = {}): Page {
+  const base: Page = pageSchema.parse({
+    title: 'My Landing',
+    locale: 'en',
+    theme: { primaryColor: '#2563eb', fontFamily: 'Inter' },
+    sections: [],
+    form: { actionUrl: '', fields: [], spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 } },
+    seo: { title: 'SEO Title', description: 'desc' },
+  })
+  return { ...base, ...overrides }
+}
+
+describe('extras 자동 생성: site.webmanifest / robots.txt', () => {
+  it('Page에서 파생된 site.webmanifest JSON과 robots.txt를 extras에 포함한다', async () => {
+    const page = makePage({ title: 'Awesome App', theme: { primaryColor: '#123456', fontFamily: 'Inter' } })
+    const extras = buildExtrasForPage(page)
+
+    // robots.txt 존재 및 베이스라인 확인
+    expect(Object.keys(extras)).toContain('robots.txt')
+    const robots = new TextDecoder().decode(extras['robots.txt'])
+    expect(robots).toMatch(/User-agent: \*/)
+
+    // manifest 존재 및 필수 키 확인
+    expect(Object.keys(extras)).toContain('site.webmanifest')
+    const manifestStr = new TextDecoder().decode(extras['site.webmanifest'])
+    const manifest = JSON.parse(manifestStr)
+    expect(manifest.name).toBe('Awesome App')
+    expect(manifest.short_name.length).toBeGreaterThan(0)
+    expect(manifest.start_url).toBe('/')
+    expect(manifest.display).toBe('standalone')
+    expect(manifest.theme_color).toBe('#123456')
+  })
+})