Sandbox error: zsh operation not permitted on /tmp/claude-{UID}/cwd-*

Description

When running Bash commands in sandbox mode, a spurious error appears before each command output:

zsh:1: operation not permitted: /tmp/claude-501/cwd-0503

The commands still execute successfully, but the error is shown with "Exit code 1" which is confusing.

Environment

• macOS (Darwin 25.2.0)
• User shell: fish (though sandbox uses zsh)
• Claude Code version: current

Observed Behavior

The sandbox appears to be trying to create/access a working directory symlink at /tmp/claude-{UID}/cwd-{random} but this path isn't in the allowed write list.

Looking at the sandbox config, the allowed write paths include:

• /tmp/claude
• /private/tmp/claude

But the actual path being accessed is /tmp/claude-501/ (where 501 is the user's UID), which doesn't match.

Expected Behavior

Either:

1. The sandbox should allow writes to /tmp/claude-{UID}/ paths, or
2. The sandbox should use /tmp/claude/ consistently

Reproduction

Run any Bash command in Claude Code with sandbox enabled. The error appears before the actual command output.