[BUG] `/security-review` command fails in git repository.

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?

When running the security-review slash command, I get an error indicating that the bash command failed.

❯ /security-review
  ⎿  Error: Bash command failed for pattern "!git diff origin/HEAD...": [stderr]
     fatal: ambiguous argument 'origin/HEAD...': unknown revision or path not in the working tree.
     Use '--' to separate paths from revisions, like this:
     'git  [...] -- [...]'

What Should Happen?

No error message.

Error Messages/Logs

❯ /security-review
  ⎿  Error: Bash command failed for pattern "!git diff origin/HEAD...": [stderr]
     fatal: ambiguous argument 'origin/HEAD...': unknown revision or path not in the working tree.
     Use '--' to separate paths from revisions, like this:
     'git  [...] -- [...]'

Steps to Reproduce

Launch claude code and run security review slash command.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.71

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_