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codex - 💡(How to fix) Fix Codex CLI in an Eclipse IDE Terminal window doesn't allow backward scrolling (also with --no-alt-screen option)

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Root Cause

Because the cause is Codex Cli only when used with Eclipse terminal (and vice-versa), I open also this: https://github.com/eclipse-platform/eclipse.platform/issues/2680

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What version of Codex CLI is running?

codex-cli 0.135.0

What subscription do you have?

Managed from my enterprise

Which model were you using?

gpt-5.5

What platform is your computer?

Windows Server 2019

What terminal emulator and version are you using (if applicable)?

Terminal of Eclipse IDE

Codex doctor report

What issue are you seeing?

Codex CLI in an Eclipse IDE terminal window doesn't allow backward scrolling. Also, running Codex with the --no-alt-screen option doesn't change anything. I know the Eclipse terminal is scrollable and Codex CLI running in Windows cmd or powershell is scrollable. So there must be some problem between Codex CLI and Eclipse terminal.

Tested under this environment:

  • Windows Server 2019
  • Eclipse IDE/Platform version Version: 2026-03 (4.39.0) Build id: 20260305-0817
  • Codex Cli version 0.135.0

What steps can reproduce the bug?

  • Open a terminal in eclipse IDE
  • Start Codex CLI with or without --no-alt-screen (even setting "set TERM=dumb" before calling codex doesn't help)
  • Give Codex the following prompt : write 50 rows (a enter b enter c etc...)
  • Try scrolling backward and see if it appears

What is the expected behavior?

the ability to scroll-back in the Eclipse IDE terminal windows running Codex CLI

Additional information

Because the cause is Codex Cli only when used with Eclipse terminal (and vice-versa), I open also this: https://github.com/eclipse-platform/eclipse.platform/issues/2680

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codex - 💡(How to fix) Fix Codex CLI in an Eclipse IDE Terminal window doesn't allow backward scrolling (also with --no-alt-screen option)