diff --git a/src/main/codex/codex-pane-launch-account.ts b/src/main/codex/codex-pane-launch-account.ts
index a59703752f4..33d091cef7c 100644
--- a/src/main/codex/codex-pane-launch-account.ts
+++ b/src/main/codex/codex-pane-launch-account.ts
@@ -66,8 +66,11 @@ function resolveCodexHomeOwnerAccountId(args: {
       getCodexSelectionLaneKey(getCodexSelectionTargetForAccount(account)) === laneKey &&
       normalizeRuntimePathForComparison(account.managedHomePath) === launchHome
   )
-  // Why: the shared runtime mirror hot-swaps to whichever account is selected, so
-  // an unattributable home is no evidence the pane is on a different one. A
-  // wrong restart notice silently drops every keystroke in that terminal.
+  // Why: an unowned home cannot be named, and naming the account a pane is stuck
+  // on is the prompt's whole job — so decline rather than guess. A wrong notice
+  // silently drops every keystroke in that terminal. Note the shared runtime
+  // mirror only hot-swaps to the current selection on the legacy flag-OFF lane;
+  // a pane resumed into it after the per-account rollout is genuinely stale but
+  // still unnameable, so that cohort stays unreported.
   return owner ? owner.id : undefined
 }
diff --git a/src/main/ipc/pty.test.ts b/src/main/ipc/pty.test.ts
index 10f17505981..b6499469fa4 100644
--- a/src/main/ipc/pty.test.ts
+++ b/src/main/ipc/pty.test.ts
@@ -13638,6 +13638,126 @@ describe('registerPtyHandlers', () => {
     expect(forgetCodexPaneAccountMock).toHaveBeenCalledWith('pty-resumed')
   })
 
+  // Why: the runtime controller is the CLI/relay resume path, and it repeats the
+  // same recording call the ipc handler makes. Without its own coverage a revert
+  // there is invisible.
+  it('records the origin account for a resumed Codex pane spawned by the runtime controller', async () => {
+    type RuntimeSpawnController = {
+      spawn(args: Record<string, unknown>): Promise<{ id: string }>
+    }
+    setLocalPtyProvider({
+      spawn: vi.fn(async () => ({ id: 'pty-runtime-resumed' })),
+      write: vi.fn(),
+      resize: vi.fn(),
+      kill: vi.fn(),
+      shutdown: vi.fn(),
+      onData: vi.fn(() => vi.fn()),
+      onExit: vi.fn(() => vi.fn()),
+      listProcesses: vi.fn(async () => []),
+      getForegroundProcess: vi.fn(async () => null)
+    } as never)
+    const runtime = {
+      setPtyController: vi.fn(),
+      registerPty: vi.fn(),
+      noteTerminalSpawnCommand: vi.fn(),
+      onPtySpawned: vi.fn(),
+      onPtyExit: vi.fn(),
+      onPtyData: vi.fn()
+    }
+    const getSettings = vi.fn().mockReturnValue({
+      activeCodexManagedAccountId: 'account-b',
+      codexManagedAccounts: [
+        { id: 'account-a', managedHomePath: '/managed/origin/home' },
+        { id: 'account-b', managedHomePath: '/managed/current/home' }
+      ]
+    })
+    handlers.clear()
+    registerPtyHandlers(
+      mainWindow as never,
+      runtime as never,
+      vi.fn(() => '/managed/current/home'),
+      getSettings as never,
+      undefined,
+      undefined,
+      { prepareCodexSessionResume: async () => ({ codexHomePath: '/managed/origin/home' }) }
+    )
+    const controller = runtime.setPtyController.mock.calls[0]?.[0] as RuntimeSpawnController
+
+    await controller.spawn({
+      cols: 80,
+      rows: 24,
+      worktreeId: 'wt-runtime',
+      command: 'codex resume session-a',
+      launchAgent: 'codex',
+      resumeProviderSession: {
+        key: 'session_id',
+        id: 'session-a',
+        transcriptPath: '/managed/origin/home/sessions/2026/07/20/rollout-a.jsonl'
+      }
+    })
+
+    expect(recordCodexPaneAccountMock.mock.calls).toEqual([
+      ['pty-runtime-resumed', { selectionKey: 'host', accountId: 'account-a' }]
+    ])
+    expect(forgetCodexPaneAccountMock).not.toHaveBeenCalled()
+  })
+
+  it('leaves a runtime-controller resumed Codex pane unattributed when no account owns its home', async () => {
+    type RuntimeSpawnController = {
+      spawn(args: Record<string, unknown>): Promise<{ id: string }>
+    }
+    setLocalPtyProvider({
+      spawn: vi.fn(async () => ({ id: 'pty-runtime-resumed' })),
+      write: vi.fn(),
+      resize: vi.fn(),
+      kill: vi.fn(),
+      shutdown: vi.fn(),
+      onData: vi.fn(() => vi.fn()),
+      onExit: vi.fn(() => vi.fn()),
+      listProcesses: vi.fn(async () => []),
+      getForegroundProcess: vi.fn(async () => null)
+    } as never)
+    const runtime = {
+      setPtyController: vi.fn(),
+      registerPty: vi.fn(),
+      noteTerminalSpawnCommand: vi.fn(),
+      onPtySpawned: vi.fn(),
+      onPtyExit: vi.fn(),
+      onPtyData: vi.fn()
+    }
+    const getSettings = vi.fn().mockReturnValue({
+      activeCodexManagedAccountId: 'account-b',
+      codexManagedAccounts: [{ id: 'account-b', managedHomePath: '/managed/current/home' }]
+    })
+    handlers.clear()
+    registerPtyHandlers(
+      mainWindow as never,
+      runtime as never,
+      vi.fn(() => '/managed/current/home'),
+      getSettings as never,
+      undefined,
+      undefined,
+      { prepareCodexSessionResume: async () => ({ codexHomePath: '/managed/shared-mirror/home' }) }
+    )
+    const controller = runtime.setPtyController.mock.calls[0]?.[0] as RuntimeSpawnController
+
+    await controller.spawn({
+      cols: 80,
+      rows: 24,
+      worktreeId: 'wt-runtime',
+      command: 'codex resume session-a',
+      launchAgent: 'codex',
+      resumeProviderSession: {
+        key: 'session_id',
+        id: 'session-a',
+        transcriptPath: '/managed/shared-mirror/home/sessions/2026/07/20/rollout-a.jsonl'
+      }
+    })
+
+    expect(recordCodexPaneAccountMock).not.toHaveBeenCalled()
+    expect(forgetCodexPaneAccountMock).toHaveBeenCalledWith('pty-runtime-resumed')
+  })
+
   it('seeds cold restore at recovered dimensions with a legacy dimensionless fallback', async () => {
     const oscLinks = [{ row: 0, startCol: 0, endCol: 8, uri: 'https://example.com/restored' }]
     const coldRestore = {