Codex does not monitor and thus not re-read files if they change externally

What version of Codex is running?

v0.58.0-alpha.7

What subscription do you have?

Pro

Which model were you using?

gpt-5-codex-high

What platform is your computer?

macOS

What issue are you seeing?

Please see uploaded session

• My last prompt to codex was over 8 hours ago where it made a bunch of changes to a file.
• I later went over the code and manually made a large number of edits.
• I asked codex to compare this file with another file (Task+Attachments.swift) for analysis - and I see the following, suggesting it only read the one file and not the one it last worked on:

• Explored
└ Read Task+Alarms.swift

• Comparing Task+Attachment and Task+Alarms (39s • esc to interrupt)

This is incorrect, it seems unlike Claude Code it does not monitor files on disk, does not realize they've changed and does not re-read even when it was asked to in subtle terms 'compare' (implying it should make sure it's read it).

What steps can reproduce the bug?

Uploaded thread: 019a7761-25de-7d72-8378-1d9bef74d758

What is the expected behavior?

Claude for instance monitors files for any change and will always re-read the portion / full file etc as needed if it's determined its version is stale. This is the correct expected behavior.

Additional information

_No response_