Codex extension in VS Code IDE does not work when Amazon Q Developer extension is installed in VS Code

Opened this issue in the VS Code repo too in https://github.com/microsoft/vscode/issues/319168 (not sure if this is a VS Code IDE issue or Codex VS Code extension issue).

What version of the IDE extension are you using?

26.527.31454

What subscription do you have?

Enterprise ChatGPT account through my work email

Which IDE are you using?

VS Code version 1.122.1

What platform is your computer?

Darwin 25.5.0 arm64 arm (macOS Tahoe 26.5 (25F71))

What issue are you seeing?

Codex extension in VS Code IDE does not work when Amazon Q Developer extension is installed in VS Code.

When the Amazon Q Developer extension is installed in VS Code IDE on my Mac laptop, after installing the Codex extension in VS Code, the Codex GUI panel in VS Code does not load and is empty. See below screenshot:

<img width="449" height="808" alt="Image" src="https://github.com/user-attachments/assets/e5aeccac-e48f-42e7-88cb-4d3298bbc7f6" />

I see below errors in the VS Code logs on my Mac:

/Users/<username>/Library/Application Support/Code/logs/20260530T153119/window1/exthost/openai.chatgpt/Codex.log has:

2026-05-30 15:31:20.301 [info] Activating Codex extension
2026-05-30 15:31:20.301 [info] [CodexMcpConnection] Spawning codex app-server
2026-05-30 15:31:20.301 [info] ChatGPT desktop bridge active
2026-05-30 15:31:20.308 [info] [CodexMcpConnection] Initialize received id=1
2026-05-30 15:31:20.981 [error] Request failed conversationId=none durationMs=10 error={"code":-32603,"message":"No such file or directory (os error 2)"} id=f54d7694-079f-4289-9f99-2f2e28e1d3f0 method=fs/readFile pendingCountAfter=1 timeoutMs=0
2026-05-30 15:31:24.193 [info] [startup][renderer] app routes mounted after 3846ms
2026-05-30 15:31:26.143 [error] [desktop-notifications][unhandled-rejection] {"value":{},"source":"owned","hooks":[],"promises":[]}

/Users/<username>/Library/Application Support/Code/logs/20260530T153413/window1/exthost/openai.chatgpt/Codex.log has:

2026-05-30 15:34:14.838 [info] Activating Codex extension
2026-05-30 15:34:14.838 [info] [CodexMcpConnection] Spawning codex app-server
2026-05-30 15:34:14.838 [info] ChatGPT desktop bridge active
2026-05-30 15:34:15.079 [info] [CodexMcpConnection] Initialize received id=1
2026-05-30 15:34:15.703 [error] Request failed conversationId=none durationMs=27 error={"code":-32603,"message":"No such file or directory (os error 2)"} id=bf81d7a4-40ec-4e08-92e0-67d867d8f7a7 method=fs/readFile pendingCountAfter=1 timeoutMs=0
2026-05-30 15:34:19.299 [info] [startup][renderer] app routes mounted after 4448ms
2026-05-30 15:34:21.859 [error] [desktop-notifications][unhandled-rejection] {"value":{},"source":"owned","hooks":[],"promises":[]}

Workaround / Fix:

Disabling the Amazon Q Developer extension in VS Code IDE, and restarting VS Code fixed the issue and the Codex GUI panel loaded fine as expected in VS Code.

What steps can reproduce the bug?

1. Install Amazon Q Developer extension and Codex extension in VS Code IDE.
2. Open Codex extension's GUI in VS Code and the Codex GUI panel does not load. Restarting VS Code did not help.

What is the expected behavior?

Codex extension should work in VS Code when other extensions are installed in VS Code.

Additional information

Workaround / Fix:

Disabling the Amazon Q Developer extension in VS Code IDE, and restarting VS Code fixed the issue and the Codex GUI panel loaded fine as expected in VS Code.