[BUG] 2>&1 could not "overwrite an arbitrary file"

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Just now, I was running make test 2>&1 and the permission prompt said something like "this command contains an unescaped > which could end up overwriting a file". The addition of a rationale is nice, but in this case it's of course completely incorrect. The specific syntax (number)>(number) redirects an existing file descriptor to a new one and >& changes it to duplication of an existing file descriptor. There is no way this particular syntax could open a file descriptor to a new file.

What Should Happen?

Ideally, the permission prompt should not appear when the only redirection is to a file descriptor. Less ideally, at least the rationale message should not lie.

Error Messages/Logs

Steps to Reproduce

I am unable to trigger this warning message again but I got it just now for make test 2>&1. Annoyingly, Claude Code overwrites the prompt after you have reacted to it so it's not in my scrollback buffer any longer.

Claude tells me that make test 2>&1 should not produce this warning, but I know what I saw (though I am no longer precisely sure which command it ran).

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.50 (Claude Code)

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_