[BUG] Bash tool reports exit code 1 due to permission denied on wrong temp folder

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?

Every bash command exits with code 1 due to this error appended to output:

zsh:1: permission denied: /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/claude-xxxx-cwd

The folder /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000 is owned by root,
not the current user. Claude Code appears to be resolving the wrong per-user
temp directory slot and trying to write the cwd tracking file there.

The actual commands succeed — only the cwd file write fails, but it poisons
the exit code and makes it impossible to distinguish real failures.

macOS Darwin 24.6.0, shell: zsh

What Should Happen?

No error code.

Error Messages/Logs

Steps to Reproduce

I run eny prompt in claude. It succeeds but got this error1

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.78 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_