diff --git a/apps/mobile/src/mobileEditorDraft.test.ts b/apps/mobile/src/mobileEditorDraft.test.ts
index a1d2cb2b..3f1c3b5a 100644
--- a/apps/mobile/src/mobileEditorDraft.test.ts
+++ b/apps/mobile/src/mobileEditorDraft.test.ts
@@ -53,6 +53,54 @@ describe('mobile editor draft', () => {
     })
   })
 
+  it('serializes headings, ordered lists, and inline marks', () => {
+    const draft = createMobileEditorDraft({
+      note: {
+        id: 'formatting',
+        title: 'Formatting',
+        content: '# Formatting',
+      },
+      editorHtml: [
+        '<h2>Section</h2>',
+        '<p>Use <strong>bold</strong>, <em>emphasis</em>, <code>code</code>, and <a href="https://tolaria.app">links</a>.</p>',
+        '<ol><li>First</li><li>Second</li></ol>',
+      ].join(''),
+    })
+
+    expect(draft).toMatchObject({
+      persistable: true,
+      canonicalMarkdown: [
+        '## Section',
+        '',
+        'Use **bold**, *emphasis*, `code`, and [links](https://tolaria.app).',
+        '',
+        '1. First',
+        '1. Second',
+      ].join('\n'),
+    })
+  })
+
+  it('serializes TenTap-style task list items', () => {
+    const draft = createMobileEditorDraft({
+      note: {
+        id: 'tasks',
+        title: 'Tasks',
+        content: '# Tasks',
+      },
+      editorHtml: [
+        '<ul data-type="taskList">',
+        '<li data-checked="true"><label><input type="checkbox" checked=""></label><div><p>Done</p></div></li>',
+        '<li data-checked="false"><label><input type="checkbox"></label><div><p>Todo</p></div></li>',
+        '</ul>',
+      ].join(''),
+    })
+
+    expect(draft).toMatchObject({
+      persistable: true,
+      canonicalMarkdown: '- [x] Done\n- [ ] Todo',
+    })
+  })
+
   it('blocks unsupported HTML instead of persisting unknown editor output', () => {
     expect(
       createMobileEditorDraft({
diff --git a/apps/mobile/src/mobileEditorDraft.ts b/apps/mobile/src/mobileEditorDraft.ts
index 05546b85..8e975a31 100644
--- a/apps/mobile/src/mobileEditorDraft.ts
+++ b/apps/mobile/src/mobileEditorDraft.ts
@@ -1,5 +1,6 @@
 import { splitFrontmatter } from '@tolaria/markdown'
 import type { MobileEditorDocumentInput } from './mobileEditorDocument'
+import { serializeSupportedMobileEditorHtml } from './mobileEditorHtmlMarkdown'
 
 export type MobileEditorDraft =
   | {
@@ -24,7 +25,7 @@ export function createMobileEditorDraft({
   editorHtml: string
   note: MobileEditorDocumentInput
 }): MobileEditorDraft {
-  const markdownBody = serializeSupportedHtml(editorHtml)
+  const markdownBody = serializeSupportedMobileEditorHtml({ editorHtml })
   if (!markdownBody) {
     return createBlockedDraft({ editorHtml, note })
   }
@@ -64,41 +65,3 @@ function withFrontmatter({
   const [frontmatter] = splitFrontmatter(sourceMarkdown)
   return frontmatter ? `${frontmatter}${markdownBody}` : markdownBody
 }
-
-function serializeSupportedHtml(editorHtml: string) {
-  const blocks = editorHtml.match(/<(h1|p|ul)(?:\s[^>]*)?>[\s\S]*?<\/\1>/gi)
-  if (!blocks || blocks.join('') !== editorHtml.trim()) {
-    return null
-  }
-
-  return blocks?.map(serializeBlock).join('\n\n') ?? null
-}
-
-function serializeBlock(block: string) {
-  if (block.match(/^<h1/i)) {
-    return `# ${textContent(block)}`
-  }
-
-  if (block.match(/^<ul/i)) {
-    return listItemText(block).map((text) => `- ${text}`).join('\n')
-  }
-
-  return textContent(block)
-}
-
-function listItemText(block: string) {
-  return [...block.matchAll(/<li(?:\s[^>]*)?>([\s\S]*?)<\/li>/gi)].map((match) => textContent(match[1]))
-}
-
-function textContent(value: string) {
-  return decodeHtmlEntities(value.replace(/<[^>]+>/g, '').trim())
-}
-
-function decodeHtmlEntities(value: string) {
-  return value
-    .replace(/&lt;/g, '<')
-    .replace(/&gt;/g, '>')
-    .replace(/&quot;/g, '"')
-    .replace(/&#39;/g, "'")
-    .replace(/&amp;/g, '&')
-}
diff --git a/apps/mobile/src/mobileEditorHtmlMarkdown.ts b/apps/mobile/src/mobileEditorHtmlMarkdown.ts
new file mode 100644
index 00000000..bad8016a
--- /dev/null
+++ b/apps/mobile/src/mobileEditorHtmlMarkdown.ts
@@ -0,0 +1,99 @@
+type EditorHtmlInput = {
+  editorHtml: string
+}
+
+type HtmlInput = {
+  html: string
+}
+
+type ListItemInput = HtmlInput & {
+  ordered: boolean
+}
+
+export function serializeSupportedMobileEditorHtml(input: EditorHtmlInput) {
+  const html = normalizeBlockSpacing(input)
+  const blocks = html.match(/<(h[1-6]|p|ul|ol)(?:\s[^>]*)?>[\s\S]*?<\/\1>/gi)
+  if (!blocks || blocks.join('') !== html) {
+    return null
+  }
+
+  return blocks.map((block) => serializeBlock({ html: block })).join('\n\n')
+}
+
+function serializeBlock(input: HtmlInput) {
+  const headingLevel = headingMarkdownLevel(input)
+  if (headingLevel) {
+    return `${'#'.repeat(headingLevel)} ${inlineMarkdown(input)}`
+  }
+
+  if (isListBlock(input)) {
+    return listItemMarkdown(input).join('\n')
+  }
+
+  return inlineMarkdown(input)
+}
+
+function normalizeBlockSpacing(input: EditorHtmlInput) {
+  return input.editorHtml.trim().replace(/>\s+</g, '><')
+}
+
+function headingMarkdownLevel(input: HtmlInput) {
+  const match = input.html.match(/^<h([1-6])/i)
+  return match ? Number(match[1]) : null
+}
+
+function isListBlock(input: HtmlInput) {
+  return input.html.match(/^<(ul|ol)/i)
+}
+
+function listItemMarkdown(input: HtmlInput) {
+  const ordered = input.html.match(/^<ol/i)
+  return [...input.html.matchAll(/<li(?:\s[^>]*)?>([\s\S]*?)<\/li>/gi)].map((match) =>
+    formatListItem({ ordered: Boolean(ordered), html: match[0] }),
+  )
+}
+
+function formatListItem(input: ListItemInput) {
+  const taskMarker = markdownTaskMarker(input)
+  const prefix = taskMarker ? `- ${taskMarker}` : input.ordered ? '1.' : '-'
+
+  return `${prefix} ${inlineMarkdown(input)}`
+}
+
+function markdownTaskMarker(input: HtmlInput) {
+  if (input.html.match(/data-checked=["']true/i) || input.html.match(/<input[^>]+checked/i)) {
+    return '[x]'
+  }
+
+  if (input.html.match(/data-checked=["']false/i) || input.html.match(/<input[^>]+type=["']checkbox/i)) {
+    return '[ ]'
+  }
+
+  return null
+}
+
+function inlineMarkdown(input: HtmlInput) {
+  return decodeHtmlEntities({ text: stripRemainingTags(markInlineHtml(input)).trim() })
+}
+
+function markInlineHtml(input: HtmlInput) {
+  return input.html
+    .replace(/<br\s*\/?>/gi, '\n')
+    .replace(/<(strong|b)(?:\s[^>]*)?>([\s\S]*?)<\/\1>/gi, '**$2**')
+    .replace(/<(em|i)(?:\s[^>]*)?>([\s\S]*?)<\/\1>/gi, '*$2*')
+    .replace(/<code(?:\s[^>]*)?>([\s\S]*?)<\/code>/gi, '`$1`')
+    .replace(/<a(?:\s[^>]*)?href=["']([^"']+)["'][^>]*>([\s\S]*?)<\/a>/gi, '[$2]($1)')
+}
+
+function stripRemainingTags(value: string) {
+  return value.replace(/<[^>]+>/g, '')
+}
+
+function decodeHtmlEntities(input: { text: string }) {
+  return input.text
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&quot;/g, '"')
+    .replace(/&#39;/g, "'")
+    .replace(/&amp;/g, '&')
+}
diff --git a/docs/MOBILE_PROGRESS.md b/docs/MOBILE_PROGRESS.md
index 3ad12d03..e7bd52c9 100644
--- a/docs/MOBILE_PROGRESS.md
+++ b/docs/MOBILE_PROGRESS.md
@@ -8,7 +8,7 @@ This file is the resumable working log for Tolaria mobile. The strategy and road
 
 - Branch: `codex/mobile`
 - Active phase: Phase 2 - Mobile Shell
-- Active slice: Seed app-local mobile demo vault
+- Active slice: Expand TenTap Markdown serialization
 - Push policy: commit locally; do not push unless explicitly requested
 - Validation target: iPad/iOS simulator first
 
@@ -55,6 +55,8 @@ This file is the resumable working log for Tolaria mobile. The strategy and road
 - Created [ADR-0111](./adr/0111-expo-file-system-vault-storage.md) to record the mobile filesystem dependency and app-local vault storage path.
 - Added a mobile vault seeding boundary that writes starter Markdown files only when the app-local vault is empty.
 - Wired the mobile shell to load its starter notes through the native Expo FileSystem storage driver and stored repository path, with fixture notes retained as the fallback while storage initializes.
+- Expanded supported TenTap HTML serialization to include H1-H6 headings, ordered lists, task-list markers, inline strong/emphasis/code, and links while continuing to block unsupported block HTML.
+- Split the mobile editor HTML serializer into its own CodeScene-10 module so the draft boundary stays small.
 
 ## Next Action
 
@@ -62,7 +64,7 @@ Continue Phase 2 with the next mobile shell slice:
 
 1. Dismiss or suppress Expo Go's first-run tools modal during simulator QA so screenshots capture the app without the overlay.
 2. Expand the serializer for additional TenTap output needed by real notes: links, emphasis, code, headings, ordered lists, and task lists.
-3. Expand the serializer for additional TenTap output needed by real notes: links, emphasis, code, headings, ordered lists, and task lists.
+3. Add a save command boundary that writes persistable TenTap Markdown drafts back to mobile vault storage.
 
 ## Verification Log
 
@@ -169,6 +171,11 @@ Continue Phase 2 with the next mobile shell slice:
 - CodeScene after app-local demo vault seeding: `apps/mobile/src/MobileApp.tsx`, `apps/mobile/src/mobileDemoVault.ts`, `apps/mobile/src/mobileExpoVaultStorage.ts`, `apps/mobile/src/mobileVaultSeed.ts`, and `apps/mobile/src/mobileVaultSeed.test.ts` scored `10`; `apps/mobile/src/demoData.ts` returned no scorable code and no findings.
 - `pnpm --filter @tolaria/mobile exec expo export --platform ios --output-dir /tmp/tolaria-mobile-export` passed after app-local demo vault seeding.
 - `pnpm --filter @tolaria/mobile exec expo start --ios --clear --port 8087` launched on `iPad Pro 13-inch (M4)` after app-local demo vault seeding; screenshot captured at `/tmp/tolaria-mobile-seeded-ipad.png`. The app rendered via the stored repository path behind Expo Go's first-run Tools modal with no red runtime error overlay.
+- `pnpm --filter @tolaria/mobile test -- src/mobileEditorDraft.test.ts` passed after expanded TenTap serialization: 12 files / 42 tests.
+- `pnpm --filter @tolaria/mobile test` passed after expanded TenTap serialization: 12 files / 42 tests.
+- `pnpm --filter @tolaria/mobile typecheck` passed after expanded TenTap serialization.
+- CodeScene after expanded TenTap serialization: `apps/mobile/src/mobileEditorDraft.ts`, `apps/mobile/src/mobileEditorDraft.test.ts`, and `apps/mobile/src/mobileEditorHtmlMarkdown.ts` scored `10`.
+- `pnpm --filter @tolaria/mobile exec expo export --platform ios --output-dir /tmp/tolaria-mobile-export` passed after expanded TenTap serialization.
 
 ## Risks / Watch Items