codex really likes spaces, in a bad way

What version of Codex is running?

main/tip

Which model were you using?

gpt-5

What platform is your computer?

Darwin 24.6.0 arm64 arm

What steps can reproduce the bug?

Get OpenAI Codex to modify any Go code.

It uses spaces.

What is the expected behavior?

Tabs.

What do you see instead?

Spaces.

Additional information

In #3099 they said to use AGENTS.md, which would be appropriate for a project or company convention.

There is no universe in which Go code can be considered "correct", if it is not using tabs for indentation. There's no charitable interpretation otherwise here.