[Windows] Computer Use list_windows fails: EnumWindows error 0x80070003

What version of the Codex App are you using (From “About Codex” dialog)?

Codex App 26.803.5235.0; Computer Use plugin/runtime 26.803.41515

What subscription do you have?

Not exposed to the reporting session

What platform is your computer?

Microsoft Windows NT 10.0.26100.0 x64

What issue are you seeing?

Computer Use initializes and exposes the Windows sky API, but window enumeration fails before any GUI action can occur.

Exact error:

EnumWindows failed: The system cannot find the path specified. (0x80070003)

The result is repeatable. A direct read-only window probe with sky.get_window({ id: 0 }) fails with the same EnumWindows error.

This appears distinct from the older missing-native-pipe reports: the @oai/sky package imports successfully, sky.target is windows, and the action methods are exposed. The failure occurs when the helper attempts to enumerate Windows. No mouse, keyboard, or window-management input was sent.

What steps can reproduce the bug?

1. Enable the bundled Computer Use plugin and its skill in Codex Desktop on Windows.
2. Start a fresh Codex thread.
3. Initialize the bundled runtime:

if (!globalThis.sky) {
  const { sky } = await import("@oai/sky");
  globalThis.sky = sky;
}

1. Run:

await sky.list_windows();

1. Observe:

EnumWindows failed: The system cannot find the path specified. (0x80070003)

1. Retry sky.list_windows(); the same error is returned.
2. Run the read-only probe await sky.get_window({ id: 0 }); it returns the same error.

Session ID is omitted because it is not needed to reproduce the local native-helper failure.

What is the expected behavior?

sky.list_windows() should return the visible Windows top-level windows so the requested target can be selected and captured. A missing internal path should be reported with the specific unresolved path or helper component.

Additional information

Additional compatibility observation: the bundled Computer Use skill instructs callers to use sky.documentation("guidance") and sky.documentation("confirmations"), but sky.documentation is not present in this release's exported sky object.

Potentially related but not identical:

• #25571 and #25507 fail earlier because the native pipe/helper path is unavailable.
• #25314 reports that list_windows() works while app discovery times out.
• In this report, bootstrap succeeds but list_windows() itself fails with 0x80070003.

Computer Use was tested only with read-only discovery calls. No application or window state was changed.