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Browser Use cannot discover Codex In-App Browser backend #19463
Description
Title:
Browser Use cannot discover Codex In-App Browser backend
Environment:
- Codex desktop app
- macOS
- Browser Use plugin: openai-bundled/browser-use/0.1.0-alpha1
- Backend requested: iab
- Date: 2026-04-25
Issue:
When using the Browser Use skill to open any URL in the Codex in-app browser, the runtime fails before navigation.
Tried URLs:
Expected:
Browser Use should connect to the current Codex in-app browser tab and navigate to the requested URL.
Actual:
The Node REPL call:
setupAtlasRuntime({ globals: globalThis, backend: "iab" })
fails with:
Failed to connect to browser-use backend "iab". No Codex IAB backends were discovered.
Notes:
- The Browser Use plugin is enabled.
- The in-app browser can be opened manually with Cmd + Shift + B.
- The failure happens before any page navigation.
- This appears to be an IAB backend discovery/registration problem, not a website-specific problem.
Activity
neusse commentedon Apr 25, 2026
I think I have identified the issue and have a work around until it is fixed.
#19423 (comment)
Liudon commentedon Apr 25, 2026
I've encountered this problem as well.
marcelsafin commentedon Apr 27, 2026
same
zach-jaggars commentedon Apr 28, 2026
Same issue, here is the feedback id: 019dd488-81d1-7ce1-affe-9aed15ace538
aston314 commentedon May 4, 2026
I can reproduce this as well, with the following environment:
openai-bundled/browser-use/0.1.0-alpha1iabRepro steps:
browser-useskill to callsetupAtlasRuntime({ globals: globalThis, backend: "iab" }).Actual result:
Failed to connect to browser-use backend "iab". No Codex IAB backends were discovered.Expected result:
Browser Use should connect to the current Codex in-app browser and start navigating.
Additional notes:
iabbackend discovery still fails.mbrq-cs commentedon May 7, 2026
Same issue. I consistently can replicate the issue in any chat after compact. Feedback id:
019e0081-d220-7173-a272-9daf9e0783cf