The Codex CLI provides terminal-specific options for how interactive sessions look and how you enter commands and prompts.
Syntax highlighting and themes
The terminal UI (TUI) syntax-highlights fenced Markdown code blocks and file
diffs. Run /theme to open the theme picker, preview themes, and save your
selection to tui.theme in $CODEX_HOME/config.toml.
To add a custom theme, place a .tmTheme file in $CODEX_HOME/themes, then
select it from the theme picker.
Shell completions
Generate a completion script for Bash, the Z shell, Fish, or PowerShell:
codex completion zshLoad the script from your shell configuration. For the Z shell, add:
eval "$(codex completion zsh)"If the Z shell reports command not found: compdef, initialize its completion system
before loading the Codex completions:
autoload -Uz compinit && compinit
eval "$(codex completion zsh)"Restart the shell, type codex, and press Tab to verify completion.
Prompt editor
For longer prompts, press Ctrl+G in the composer to open
the editor configured by VISUAL, or EDITOR when VISUAL isn’t set. Save
and close the editor to return the text to the composer before sending it.
For interactive keyboard controls and the full command and option list, see Commands.