[BUG] The `--add-dirs` conflicts with custom prompt

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 invoking claude like that:

$ claude --add-dir <PATH> <PROMPT>

where the prompt is slash command, Claude considers <PROMPT> a path to add and fails (and also not executes the command).

What Should Happen?

I'd be simple to have just --prompt option as well to be able to clearly separate these two

Error Messages/Logs

Path `/mr:foo 123` was not found.

Steps to Reproduce

I want it ro run /mr:foo 123 command on start:

$ claude --add-dir /home/xyz "/mr:foo 123"

and that would end up with failure

Path `/mr:foo 123` was not found.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.14

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_