Windows: node_repl MCP fails with “Access is denied” when launched by Codex Desktop

Open 💬 1 comment Opened May 4, 2026 by clooney2

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

26.429.3425.0, CLI 0.128.0-alpha.1.

What subscription do you have?

Plus

What platform is your computer?

Win 11 25H2, build 26200.8246

What issue are you seeing?

Codex Desktop on Windows, app version OpenAI.Codex_26.429.3425.0, CLI 0.128.0-alpha.1.

Browser Use fails before opening a tab because node_repl cannot start Node:
failed to execute Node: Přístup byl odepřen. (os error 5)

Manual checks:

  • node.exe runs from PowerShell.
  • node_repl.exe --disable-sandbox starts manually.
  • A wrapper CMD calling node_repl.exe --disable-sandbox works manually over MCP stdio and returns JS result 1+1 = 2.
  • The same wrapper configured as [mcp_servers.node_repl_direct] in config.toml loads in Codex, but tool call still fails with os error 5.

This suggests the failure is specific to MCP server / Node kernel launch context inside Codex Desktop.

Additional UI issue:
The Artifacts / Sources popover opens on the right side and overlaps the vertical scrollbar. It prevents grabbing the scrollbar with the mouse. Esc, clicking outside, and the top-right panel button do not dismiss it reliably. This happens in Codex Desktop on Windows.

What steps can reproduce the bug?

Starting Browser Use

What is the expected behavior?

_No response_

Additional information

_No response_

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