Browser control fails on macOS 14.1.2: sandbox-exec: unbound variable: TIOCSTI

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

26.915.31029 (build 9771), installed as ChatGPT.app

What subscription do you have?

Plus

What platform is your computer?

Darwin 23.1.0 arm64 arm macOS 14.1.2 (23B92)

What issue are you seeing?

Browser control fails before the automation runtime can connect to the in-app browser. The browser itself opens and displays websites, but the assistant cannot inspect or interact with pages.

The tool returned these errors:

trusted Node process exited unexpectedly; kernel reset, rerun your request

node_repl kernel exited unexpectedly

kernel_status: exited(code=65)
kernel_stderr_tail:
sandbox-exec: unbound variable: TIOCSTI at , line 144, column 33
Backtrace:
:144:33:
TIOCSTI

This blocks browser automation across tasks. Repeated app restarts and a JavaScript runtime reset did not resolve the issue.

What steps can reproduce the bug?

1. Open the desktop app on macOS 14.1.2.
2. Open a website in the in-app browser.
3. Ask the assistant to inspect or control the browser using @Browser.
4. The browser automation runtime exits before returning browser state.

The assistant reproduced the failure using the supported cua_repl tool with:

await cua.getState();

An earlier attempt to open a website using cua.createBrowserTab(...) also failed during runtime startup.

The failure persisted after multiple app restarts and a runtime reset.

What is the expected behavior?

The browser automation runtime should initialize successfully, discover the open browser tab, and allow the assistant to inspect and interact with websites.

Additional information

Unified computer use plugin version: 26.915.31029.
Bundled app-server reported version: 0.155.0-alpha.9.

Read-only inspection found this literal sandbox rule in the bundled executable /Applications/ChatGPT.app/Contents/Resources/codex:

(deny file-ioctl (ioctl-command TIOCSTI))

This suggests a sandbox policy compatibility problem, but the underlying cause has not been confirmed.

App logs recorded an update download while running build 9647. The installed app now reports build 9771, and browser control continued to fail.

No application binaries or sandbox protections were modified.

browser-runtime-diagnostic.md

Start by reproducing the failure with the supported cua_repl call await cua.getState() and inspect the bundled /Applications/ChatGPT.app/Contents/Resources/codex sandbox rule and browser-runtime-diagnostic.md. Trace the macOS sandbox startup failure around the TIOCSTI rule; done means the automation runtime initializes, discovers the open tab, and permits browser inspection and interaction.