diff --git a/config/vitest.config.ts b/config/vitest.config.ts
index bee38dc32c9..54f816309f8 100644
--- a/config/vitest.config.ts
+++ b/config/vitest.config.ts
@@ -10,6 +10,6 @@ export default defineConfig({
   },
   test: {
     environment: 'node',
-    include: ['src/**/*.test.ts', 'src/**/*.test.tsx']
+    include: ['src/**/*.test.ts', 'src/**/*.test.tsx', 'mobile/src/**/*.test.ts']
   }
 })
diff --git a/mobile/src/transport/rpc-client.test.ts b/mobile/src/transport/rpc-client.test.ts
index 505a5722bd4..e7ef7ca8c90 100644
--- a/mobile/src/transport/rpc-client.test.ts
+++ b/mobile/src/transport/rpc-client.test.ts
@@ -108,4 +108,27 @@ describe('mobile rpc-client connection timeout', () => {
 
     client.close()
   })
+
+  it('sends session tabs unsubscribe when a session tab stream is disposed', () => {
+    const client = connect('ws://desktop.invalid', 'token', 'server-key')
+    const socket = mockSockets[0]!
+
+    socket.open()
+    socket.receive(JSON.stringify({ type: 'e2ee_ready' }))
+    socket.receive('encrypted:{"type":"e2ee_authenticated"}')
+
+    const unsubscribe = client.subscribe(
+      'session.tabs.subscribe',
+      { worktree: 'id:wt-1' },
+      () => {}
+    )
+    unsubscribe()
+
+    expect(
+      socket.sent.some((payload) => payload.includes('"method":"session.tabs.unsubscribe"'))
+    ).toBe(true)
+    expect(socket.sent.some((payload) => payload.includes('"worktree":"id:wt-1"'))).toBe(true)
+
+    client.close()
+  })
 })
diff --git a/mobile/src/transport/rpc-client.ts b/mobile/src/transport/rpc-client.ts
index 790723239a7..189016471ef 100644
--- a/mobile/src/transport/rpc-client.ts
+++ b/mobile/src/transport/rpc-client.ts
@@ -893,6 +893,18 @@ export function connect(
               ...(clientId ? { client: { id: clientId } } : {})
             }
           })
+        } else if (
+          stream?.method === 'session.tabs.subscribe' &&
+          stream.params &&
+          typeof stream.params === 'object' &&
+          typeof (stream.params as { worktree?: unknown }).worktree === 'string'
+        ) {
+          sendEncrypted({
+            id: nextId(),
+            deviceToken,
+            method: 'session.tabs.unsubscribe',
+            params: { worktree: (stream.params as { worktree: string }).worktree }
+          })
         }
       }
     },
diff --git a/src/main/runtime/rpc/methods/session-tabs.test.ts b/src/main/runtime/rpc/methods/session-tabs.test.ts
new file mode 100644
index 00000000000..20c0d99ada1
--- /dev/null
+++ b/src/main/runtime/rpc/methods/session-tabs.test.ts
@@ -0,0 +1,41 @@
+import { describe, expect, it, vi } from 'vitest'
+import { RpcDispatcher } from '../dispatcher'
+import type { RpcRequest } from '../core'
+import type { OrcaRuntimeService } from '../../orca-runtime'
+import { SESSION_TAB_METHODS } from './session-tabs'
+
+function makeRequest(method: string, params?: unknown): RpcRequest {
+  return { id: 'req-1', authToken: 'tok', method, params }
+}
+
+describe('session tab RPC methods', () => {
+  it('unsubscribes a session tabs stream using the resolved worktree id and connection id', async () => {
+    const cleanupSubscription = vi.fn()
+    const runtime = {
+      getRuntimeId: () => 'test-runtime',
+      listMobileSessionTabs: vi.fn().mockResolvedValue({
+        worktree: 'wt-1',
+        snapshotVersion: 1,
+        activeGroupId: null,
+        activeTabId: null,
+        activeTabType: null,
+        tabs: []
+      }),
+      cleanupSubscription
+    } as unknown as OrcaRuntimeService
+    const dispatcher = new RpcDispatcher({ runtime, methods: SESSION_TAB_METHODS })
+    const messages: string[] = []
+
+    await dispatcher.dispatchStreaming(
+      makeRequest('session.tabs.unsubscribe', { worktree: 'id:wt-1' }),
+      (message) => messages.push(message),
+      { connectionId: 'conn-1' }
+    )
+
+    expect(cleanupSubscription).toHaveBeenCalledWith('session.tabs:conn-1:wt-1')
+    expect(JSON.parse(messages[0]!)).toMatchObject({
+      ok: true,
+      result: { unsubscribed: true }
+    })
+  })
+})
diff --git a/src/main/runtime/rpc/methods/session-tabs.ts b/src/main/runtime/rpc/methods/session-tabs.ts
index 23c84b7be9d..547ff5933f9 100644
--- a/src/main/runtime/rpc/methods/session-tabs.ts
+++ b/src/main/runtime/rpc/methods/session-tabs.ts
@@ -52,11 +52,21 @@ export const SESSION_TAB_METHODS: RpcAnyMethod[] = [
         subscriptionId,
         () => {
           unsubscribe()
+          emit({ type: 'end' })
         },
         connectionId
       )
     }
   }),
+  defineMethod({
+    name: 'session.tabs.unsubscribe',
+    params: WorktreeTabSelector,
+    handler: async (params, { runtime, connectionId }) => {
+      const snapshot = await runtime.listMobileSessionTabs(params.worktree)
+      runtime.cleanupSubscription(`session.tabs:${connectionId ?? 'local'}:${snapshot.worktree}`)
+      return { unsubscribed: true }
+    }
+  }),
   defineMethod({
     name: 'markdown.readTab',
     params: ActivateTab,
diff --git a/src/renderer/src/App.tsx b/src/renderer/src/App.tsx
index cf1f063ec8a..82e6a0dcd7d 100644
--- a/src/renderer/src/App.tsx
+++ b/src/renderer/src/App.tsx
@@ -43,6 +43,8 @@ import { useEditorExternalWatch } from './hooks/useEditorExternalWatch'
 import { useAutoAckViewedAgent } from './hooks/useAutoAckViewedAgent'
 import { useUnreadDockBadge } from './hooks/useUnreadDockBadge'
 import {
+  getRuntimeMobileSessionSyncKey,
+  scheduleRuntimeGraphSync,
   setRuntimeGraphStoreStateGetter,
   setRuntimeGraphSyncEnabled
 } from './runtime/sync-runtime-graph'
@@ -403,6 +405,32 @@ function App(): React.JSX.Element {
     }
   }, [])
 
+  useEffect(() => {
+    let previousKey = getRuntimeMobileSessionSyncKey(useAppStore.getState())
+    return useAppStore.subscribe((state, previousState) => {
+      if (
+        state.tabsByWorktree === previousState.tabsByWorktree &&
+        state.groupsByWorktree === previousState.groupsByWorktree &&
+        state.activeGroupIdByWorktree === previousState.activeGroupIdByWorktree &&
+        state.unifiedTabsByWorktree === previousState.unifiedTabsByWorktree &&
+        state.tabBarOrderByWorktree === previousState.tabBarOrderByWorktree &&
+        state.activeFileId === previousState.activeFileId &&
+        state.activeFileIdByWorktree === previousState.activeFileIdByWorktree &&
+        state.openFiles === previousState.openFiles &&
+        state.editorDrafts === previousState.editorDrafts &&
+        state.activeTabId === previousState.activeTabId
+      ) {
+        return
+      }
+      const nextKey = getRuntimeMobileSessionSyncKey(state)
+      if (nextKey === previousKey) {
+        return
+      }
+      previousKey = nextKey
+      scheduleRuntimeGraphSync()
+    })
+  }, [])
+
   useEffect(() => registerUpdaterBeforeUnloadBypass(), [])
 
   useEffect(() => {
diff --git a/src/renderer/src/runtime/mobile-markdown-bridge.test.ts b/src/renderer/src/runtime/mobile-markdown-bridge.test.ts
index 0fad460e7cb..4af60cbaab4 100644
--- a/src/renderer/src/runtime/mobile-markdown-bridge.test.ts
+++ b/src/renderer/src/runtime/mobile-markdown-bridge.test.ts
@@ -251,6 +251,43 @@ describe('mobile markdown bridge', () => {
     }
   })
 
+  it('restores the previous desktop draft when save verification fails after write', async () => {
+    openMarkdownFile()
+    const state = useAppStore.getState()
+    state.setEditorDraft('/repo/README.md', 'desktop draft')
+    state.markFileDirty('/repo/README.md', true)
+    let diskContent = 'desktop draft'
+    const readFile = vi.fn().mockImplementation(async () => ({
+      content: 'verified mismatch',
+      isBinary: false
+    }))
+    const writeFile = vi.fn().mockImplementation(async ({ content }) => {
+      diskContent = content
+    })
+    setupWindow({ readFile, writeFile })
+    const detachBridge = attachMobileMarkdownBridge()
+    const detachAutosave = attachEditorAutosaveController(useAppStore as never)
+
+    try {
+      const response = await sendRequest({
+        id: 'save-verify-fail',
+        operation: 'save',
+        worktreeId: 'wt-1',
+        tabId: 'tab-md',
+        baseVersion: hashMarkdownContent('desktop draft'),
+        content: 'mobile edit'
+      })
+
+      expect(response).toMatchObject({ id: 'save-verify-fail', ok: false })
+      expect(diskContent).toBe('mobile edit')
+      expect(useAppStore.getState().editorDrafts['/repo/README.md']).toBe('desktop draft')
+      expect(useAppStore.getState().openFiles[0]?.isDirty).toBe(true)
+    } finally {
+      detachAutosave()
+      detachBridge()
+    }
+  })
+
   it('serializes saves so duplicate base versions do not both write', async () => {
     openMarkdownFile()
     let diskContent = 'original'
diff --git a/src/renderer/src/runtime/mobile-markdown-bridge.ts b/src/renderer/src/runtime/mobile-markdown-bridge.ts
index 02e1d1b006d..58d11e303c5 100644
--- a/src/renderer/src/runtime/mobile-markdown-bridge.ts
+++ b/src/renderer/src/runtime/mobile-markdown-bridge.ts
@@ -145,11 +145,12 @@ function restoreFailedMobileSaveDraft(
   previousDirty: boolean
 ): void {
   const state = useAppStore.getState()
-  if (state.editorDrafts[fileId] !== injectedContent) {
+  const currentDraft = state.editorDrafts[fileId]
+  if (currentDraft !== undefined && currentDraft !== injectedContent) {
     return
   }
   // Why: mobile save injects a desktop draft only to reuse the editor save path.
-  // If that save fails, put the desktop editor back exactly as it was before.
+  // If save or verification fails, put the desktop editor back exactly as it was before.
   if (previousDraft === undefined) {
     state.clearEditorDraft(fileId)
   } else {
diff --git a/src/renderer/src/runtime/sync-runtime-graph.test.ts b/src/renderer/src/runtime/sync-runtime-graph.test.ts
new file mode 100644
index 00000000000..7c7731bd4a0
--- /dev/null
+++ b/src/renderer/src/runtime/sync-runtime-graph.test.ts
@@ -0,0 +1,67 @@
+import { describe, expect, it } from 'vitest'
+import { getRuntimeMobileSessionSyncKey } from './sync-runtime-graph'
+import type { AppState } from '../store/types'
+
+function makeState(overrides: Partial<AppState> = {}): AppState {
+  return {
+    tabsByWorktree: {},
+    groupsByWorktree: {},
+    activeGroupIdByWorktree: {},
+    unifiedTabsByWorktree: {},
+    tabBarOrderByWorktree: {},
+    activeFileId: null,
+    activeFileIdByWorktree: {},
+    openFiles: [],
+    editorDrafts: {},
+    activeTabId: null,
+    ...overrides
+  } as AppState
+}
+
+describe('getRuntimeMobileSessionSyncKey', () => {
+  it('changes when mobile markdown tab state changes', () => {
+    const base = makeState({
+      openFiles: [
+        {
+          id: '/repo/README.md',
+          filePath: '/repo/README.md',
+          relativePath: 'README.md',
+          worktreeId: 'wt-1',
+          language: 'markdown',
+          mode: 'edit',
+          isDirty: false
+        }
+      ]
+    })
+
+    const cleanKey = getRuntimeMobileSessionSyncKey(base)
+    const dirtyKey = getRuntimeMobileSessionSyncKey(
+      makeState({
+        ...base,
+        openFiles: [{ ...base.openFiles[0]!, isDirty: true }],
+        editorDrafts: { '/repo/README.md': '# draft' }
+      })
+    )
+    const activatedKey = getRuntimeMobileSessionSyncKey(
+      makeState({ ...base, activeFileId: '/repo/README.md' })
+    )
+
+    expect(dirtyKey).not.toBe(cleanKey)
+    expect(activatedKey).not.toBe(cleanKey)
+  })
+
+  it('changes when legacy tab bar order changes', () => {
+    const base = makeState({
+      tabBarOrderByWorktree: { 'wt-1': ['term-1', '/repo/README.md'] }
+    })
+
+    const reordered = getRuntimeMobileSessionSyncKey(
+      makeState({
+        ...base,
+        tabBarOrderByWorktree: { 'wt-1': ['/repo/README.md', 'term-1'] }
+      })
+    )
+
+    expect(reordered).not.toBe(getRuntimeMobileSessionSyncKey(base))
+  })
+})
diff --git a/src/renderer/src/runtime/sync-runtime-graph.ts b/src/renderer/src/runtime/sync-runtime-graph.ts
index f6dbc362c8c..7d14f4d21af 100644
--- a/src/renderer/src/runtime/sync-runtime-graph.ts
+++ b/src/renderer/src/runtime/sync-runtime-graph.ts
@@ -64,6 +64,45 @@ export function scheduleRuntimeGraphSync(): void {
   })
 }
 
+export function getRuntimeMobileSessionSyncKey(state: AppState): string {
+  return JSON.stringify({
+    tabsByWorktree: Object.fromEntries(
+      Object.entries(state.tabsByWorktree).map(([worktreeId, tabs]) => [
+        worktreeId,
+        tabs.map((tab) => ({
+          id: tab.id,
+          title: tab.title,
+          customTitle: tab.customTitle,
+          active: state.activeTabId === tab.id
+        }))
+      ])
+    ),
+    groupsByWorktree: state.groupsByWorktree,
+    activeGroupIdByWorktree: state.activeGroupIdByWorktree,
+    unifiedTabsByWorktree: state.unifiedTabsByWorktree,
+    tabBarOrderByWorktree: state.tabBarOrderByWorktree,
+    activeFileId: state.activeFileId,
+    activeFileIdByWorktree: state.activeFileIdByWorktree,
+    openFiles: state.openFiles.map((file) => ({
+      id: file.id,
+      filePath: file.filePath,
+      relativePath: file.relativePath,
+      worktreeId: file.worktreeId,
+      language: file.language,
+      mode: file.mode,
+      isDirty: file.isDirty,
+      isUntitled: file.isUntitled,
+      markdownPreviewSourceFileId: file.markdownPreviewSourceFileId
+    })),
+    editorDrafts: Object.fromEntries(
+      Object.entries(state.editorDrafts).map(([fileId, content]) => [
+        fileId,
+        stableHashString(content)
+      ])
+    )
+  })
+}
+
 async function syncRuntimeGraph(): Promise<void> {
   if (!syncEnabled || !getStoreState) {
     return
@@ -233,11 +272,12 @@ function buildMobileMarkdownTab(
     sourceFileId: sourceFile.id,
     sourceFilePath: sourceFile.filePath,
     sourceRelativePath: sourceFile.relativePath,
-    documentVersion: draftContent !== undefined ? hashString(draftContent) : `file:${sourceFile.id}`
+    documentVersion:
+      draftContent !== undefined ? stableHashString(draftContent) : `file:${sourceFile.id}`
   }
 }
 
-function hashString(value: string): string {
+function stableHashString(value: string): string {
   let hash = 2166136261
   for (let i = 0; i < value.length; i += 1) {
     hash ^= value.charCodeAt(i)
diff --git a/src/shared/mobile-markdown-document.ts b/src/shared/mobile-markdown-document.ts
index e1b196330a6..45fc1eb4ac1 100644
--- a/src/shared/mobile-markdown-document.ts
+++ b/src/shared/mobile-markdown-document.ts
@@ -54,12 +54,12 @@ export type RuntimeMarkdownSaveTabResult = {
 }
 
 export function hashMarkdownContent(content: string): string {
-  let hash = 2166136261
+  let hash = 0xcbf29ce484222325n
   for (let i = 0; i < content.length; i += 1) {
-    hash ^= content.charCodeAt(i)
-    hash = Math.imul(hash, 16777619)
+    hash ^= BigInt(content.charCodeAt(i))
+    hash = BigInt.asUintN(64, hash * 0x100000001b3n)
   }
-  return `content:${utf8ByteLength(content)}:${(hash >>> 0).toString(16)}`
+  return `content:${utf8ByteLength(content)}:${hash.toString(16).padStart(16, '0')}`
 }
 
 export function utf8ByteLength(content: string): number {