codex - 💡(How to fix) Fix Browser Use loses active pane binding after chat/browser detach [1 participants]

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openai/codex#20743Fetched 2026-05-03 04:46:22
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Error Message

  • Opening a new tab also fails with the same error.
  • Error should distinguish "no pane exists" from "pane exists but is detached/not bound to this thread".
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What version of the Codex App are you using (From “About Codex” dialog)?

26.429.20946

What subscription do you have?

Plus

What platform is your computer?

Windows

What issue are you seeing?

Feedback id 019de6fd-0cfe-7940-8fdd-a318d905f47f

Environment:

Observed:

  • User can see the Browser pane with the page loaded.
  • Agent attempts Browser runtime setup via setupAtlasRuntime({ backend: "iab" }).
  • agent.browser.tabs.selected() fails with: "No active Codex browser pane available".
  • Opening a new tab also fails with the same error.
  • Resetting node_repl kernel does not restore the binding.

Likely trigger:

  • User detached the chat/browser pane, after which the Browser tool no longer recognized the visible pane as attached to the current thread.

Expected:

  • Browser Use should either reattach to the visible Browser pane for the active thread, or expose a clear recovery action.
  • Error should distinguish "no pane exists" from "pane exists but is detached/not bound to this thread".

What steps can reproduce the bug?

1 - Send an instuction to open the browser 2 - From the chat on the left, click on the Open in mini window 3 - try to interact with the browser again

What is the expected behavior?

it should work

Additional information

No response

extent analysis

TL;DR

The issue can be potentially resolved by reattaching the Browser pane to the current thread after it has been detached.

Guidance

  • Verify that the Browser pane is indeed detached from the current thread by checking the agent.browser.tabs.selected() response.
  • Attempt to reattach the Browser pane to the current thread using the setupAtlasRuntime({ backend: "iab" }) method after the pane has been detached.
  • If reattaching the pane does not work, try to expose a clear recovery action, such as displaying an error message indicating that the pane is detached and needs to be reattached.
  • Investigate why resetting the node_repl kernel does not restore the binding, as this could be a related issue.

Example

No code snippet is provided as the issue does not contain sufficient information to create a concrete example.

Notes

The issue seems to be related to the Browser pane being detached from the current thread, but the exact cause and solution are unclear. Further investigation is needed to determine the root cause and develop a reliable fix.

Recommendation

Apply workaround: The best course of action is to attempt to reattach the Browser pane to the current thread after it has been detached, as this may resolve the issue. If this does not work, further investigation is needed to develop a more robust solution.

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codex - 💡(How to fix) Fix Browser Use loses active pane binding after chat/browser detach [1 participants]