Codex using Python to make edits to files

[GeorgeWingg]

I have found that instead of using the File Edit tool which it has, it runs python to make the changes.

This is quite interesting behavior, has anyone else seen this happen in their Codex Usage?

Could this because of a problem with the file edit tool, so codex prefers to script the changes with python?

[GeorgeWingg]

From a User Experience angle it's not great, as you can't see the immediate diff made like with the file edit tool.

I've also found the changes that codex makes using this approach is more sloppy than if it actually edits the file, and I think its indexing too hard on the feedback of print('patched move & removed guide') which it creates for itself as signal the change was successful.

[obmelvin]

I'm having this happen to me a lot. For some reason > 80% edits are achieved via Python and Bash rather than the built in tool. Occasionally telling it to please edit via built in file edit tools and not via Python or via direct Bash calls works.

But in this last case, I specifically asked at the start and it went ahead and changed ~250 lines over 7 files all outside of the expected workflow

Sure, I can review the work looking at the diff, but it's just odd that it consistency picks ways to edit files that don't align with the intended UX.

[bjspi]

I have the same problem in Windows, and it's pretty annoying because these changes require quite a few iterations before they actually work using a custom Python script.

Sometimes it also tries to do it using some strange PowerShell commands that don't work properly with line breaks or multi-line changes.

Why not simply use the built in EDIT Tool, or similarly the diff+merge tool like it is done when using from VSCode?

[Anyrainel]

I noticed that on Windows, codex would first attempt to use some commands such as cat, then that hit some syntax error, and after that codex starts to use pwsh or python for everything, including file edits. It wastes a lot of tokens trying to figure out the right syntax and char escaping. And even if it succeeds, the file could have incorrect indents.

My workaround is to add some of those Unix CLIs to the PATH, and remove the default PowerShell Alias. So when I'm lucky, codex would work as if it has a Linux/macOS environment.

• Install MSYS2 or other software that provide Unix CLIs. (The ones from Git or GitHub Desktop is not complete enough.)
• Add the following to the PowerShell profile you will run codex with: (notepad $PROFILE if you want to edit the default profile, remember to use your own install path)

# Add MSYS2 Unix bins to PATH
$msysPath = "C:\msys64\usr\bin"
if ($env:Path.Split(';') -notcontains $msysPath) {
    $env:Path += ";$msysPath"
}

# Remove PowerShell aliases that shadow common Unix commands
$unixCommands = @(
    'cat', 'cp', 'diff', 'echo', 'ls', 'mv', 'pwd', 'rm', 'rmdir', 'sort',
    'clear', 'dir', 'fc', 'ps', 'sort', 'start', 'tee', 'where'
)

foreach ($name in $unixCommands) {
    $alias = Get-Alias -Name $name -ErrorAction SilentlyContinue
    if ($alias) {
        $target = $alias.Definition
        if (Get-Command $target -CommandType Cmdlet -ErrorAction SilentlyContinue) {
            Remove-Item "Alias:$name" -ErrorAction SilentlyContinue
        }
    }
}

• Optionally write something in AGENTS.md to tell codex that this is a pwsh environment with many Unix commands, and you prefer it to use the Unix commands.

With this, codex will display its actions with much more readable UI and have better success rate.

[GeorgeWingg]

I personally think its a product of the RL environment that OpenAI is using to train gpt5, where it probably doesn't have access to the typical file edit tool, so it tries to use alternatives like trying to edit files with ephemeral scripts it makes.

So from my perspective its either the File Edit tool in codex is either not "ergonomic" enough for the model to use, or its a problem with the model itself that cant be fixed with codex.

[mickeyl]

Same here on macOS. Doesn't that make the already slow Codex even slower?

[bjspi]

It actually does make it very slow. Needs a lot of iterations for easy edits, because they don't always work first try....

[onkarrai06]

Do I have to give it permissions to use file edit? Because I'm having the same problem.

[hwo411]

Also was surprised by that. Some people told me using and MCP server for file editing could help, but didn't have a chance to try.

[jeanlucthumm]

Is there an open issue for this?

[GeorgeWingg]

I wouldn't call this an issue, i believe it's a design decision from the codex team.

[mickeyl]

cough If so, a very strange one that's an incredible waste of resources, then.

[GeorgeWingg]

I'm not sure what resource would be wasted here.

The main thing that matters is its ability to make successful file edits, if it is able to do that by running ephemeral python scripts then I don't see much of an issue.

[bjspi]

I'm not sure what resource would be wasted here.

The main thing that matters is its ability to make successful file edits, if it is able to do that by running ephemeral python scripts then I don't see much of an issue.

For me it keeps iterating until it finds a solution to finally make the smallest type of edits successfully. So it definitely is an issue for me

[johnyfernandes]

I'm not sure what resource would be wasted here.
The main thing that matters is its ability to make successful file edits, if it is able to do that by running ephemeral python scripts then I don't see much of an issue.

For me it keeps iterating until it finds a solution to finally make the smallest type of edits successfully. So it definitely is an issue for me

Yes, 100%. It uses Python 90% of the times to edit files, and most times, it isn't able to make the change using Python for the 1st time, so, it keeps running Python scripts, sometimes 3/4x for just 1 change, so, this spends way more tokens than supposed I presume.

[JakkuSakura]

Sometimes it's using git diff tool to edit files. Weird but works fine most of the time

[walesdata]

Changing the model from gpt-5-codex / medium to gpt-5 / medium fixed this for me.

[cau1k]

I personally think this is really cool. There’s something beautiful about AI made with code using code to write more code. Full circle moment if you ask me.

I was hesitant at first, telling it to “stop using python to edit files” in my AGENTS.md, but, low and behold, Codex started using Ruby to edit files. Honestly, just let it do its thing. It’s an incredible model.

[GeorgeWingg]

Haha this is awesome, I'm gonna bring this up at DevDay.

I second this view

[EnvyGithub]

#如果您尝试在不支持其本机沙盒机制的环境（例如较旧的 Linux 内核或 Windows）中使用 Codex，则可能还需要使用此选项。
sandbox_mode = "danger-full-access"

在配置文件中添加这个,一切都好使了.

[EnvyGithub]

仅针对windows 系统.