Retain queued prompts when temporarily switching to subagent thread

What version of Codex CLI is running?

0.106.0

What subscription do you have?

pro

Which model were you using?

gpt-5.3-codex

What platform is your computer?

Linux 6.18.8-arch2-1 x86_64 unknown

What terminal emulator and version are you using (if applicable)?

st (suckless), tmux 3.6a

What issue are you seeing?

If a prompt(s) is queued (using tab) and /agent is used to switch to another and back, the ququeed prompt disappears and never executes.

What steps can reproduce the bug?

1. Enter "Start 2 subagents that sleep 30, and wait for them."
2. Enter "Say hello"
3. Press TAB
4. /agent, and switch to a subagent
5. /agent, and switch back to the main agent
6. Observe the task queue is gone, and after the subagents finish it never says hello, so it's not just a display omission.

What is the expected behavior?

The queued prompt(s) should still execute normally

Additional information

_No response_