why i can't ask Claude to launch 4 codex:review commands in parallel ?!

why i can't ask Claude to launch 4 codex:review commands in parallel ?! I do that manually to maximize the chances of finding bugs. Please add this support so my claude can kick of 4 agents that will perform codex review
<img width="701" height="187" alt="Image" src="https://github.com/user-attachments/assets/717b822e-a631-44c8-8146-2371a7d87b38" />