/title slash command is sent to the model instead of updating the thread title

What version of Codex CLI is running?

codex-cli 0.130.0

What subscription do you have?

Pro

Which model were you using?

gpt-5.5

What platform is your computer?

Darwin 24.6.0 arm64 arm

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

iTerm2 3.6.9 (TERM=xterm-256color)

What issue are you seeing?

When I type /title 1 in Codex CLI, the command is not handled as a CLI slash command. It appears to be sent to the model as normal user input, and the assistant replies with 1. The tab title is not updated.

What steps can reproduce the bug?

Uploaded thread: 019e1637-8011-7e50-8c79-1b55dab2989b

Steps to reproduce:

1. Start an interactive Codex CLI session.
2. Type /title 1 and press Enter.
3. Observe that the assistant replies with 1.
4. The conversation/thread title is not changed.

What is the expected behavior?

/title 1 should update the current conversation/thread title to 1. If /title is not a supported slash command, the CLI should show a local unknown-command/help message instead of sending the text to the model.

Additional information

Observed on macOS in iTerm2. The behavior makes /title look accepted by the model while no title change actually happens