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## Why Codex 0.131 started enabling tmux `modifyOtherKeys` mode 2 when the active tmux session reported `extended-keys-format csi-u`, and also when that format could not be queried. The fallback was meant to help compatible tmux panes enter extended-key mode, but it breaks iTerm2 control-mode sessions on older tmux. Issue #23711 reproduces with: ```bash ssh -t ubuntu@192.168.68.149 'tmux -CC new -A -s main' ``` On tmux 3.2a, `extended-keys-format` is not available. With mode 2 enabled, `Ctrl-C` is delivered as `^[[27;5;99~` instead of the normal interrupt/control key path, so Codex does not handle it. Running with `CODEX_TUI_DISABLE_KEYBOARD_ENHANCEMENT=1` restores `Ctrl-C`, which points at keyboard mode setup rather than chat input routing. ## What Changed - Only request `modifyOtherKeys` mode 2 when tmux explicitly reports `extended-keys-format csi-u`. - Treat an unknown or unavailable tmux extended-key format as unsupported for this mode. - Update the keyboard mode unit coverage so `None` no longer opts into `modifyOtherKeys`. This preserves the explicit modern tmux `csi-u` path from #21943 while avoiding the unsafe fallback on older or unqueryable tmux setups. ## How to Test Regression path from #23711: 1. Start iTerm2 tmux integration against an older tmux host: ```bash ssh -t ubuntu@192.168.68.149 'tmux -CC new -A -s main' ``` 2. Start patched Codex. 3. Run `/keymap debug`, press a regular key, then press `Ctrl-C`. 4. Confirm `Ctrl-C` closes the inspector and Codex remains responsive without `CODEX_TUI_DISABLE_KEYBOARD_ENHANCEMENT=1`. 5. Confirm `Shift+Enter` still inserts a newline in the same session. Modern tmux compatibility path: 1. Start an ordinary tmux 3.6a server with explicit `csi-u`: ```bash tmux -L codex-csiu -f /dev/null new-session -d -s repro tmux -L codex-csiu set-option -g extended-keys on tmux -L codex-csiu set-option -g extended-keys-format csi-u tmux -L codex-csiu attach -t repro ``` 2. Start patched Codex. 3. From another terminal, confirm the Codex pane reports `mode=Ext 2`: ```bash tmux -L codex-csiu list-panes -a -F '#{pane_id} mode=#{pane_key_mode} cmd=#{pane_current_command}' ``` 4. Type `one`, press `Shift+Enter`, type `two`, and confirm the composer shows two lines without submitting. 5. Press `Ctrl-C` and confirm Codex handles it normally. Targeted tests: - `./tools/argument-comment-lint/run.py -p codex-tui -- --lib` - `just test -p codex-tui` runs the new keyboard mode test successfully; the full run currently reports two unrelated guardian feature-flag test failures: - `app::tests::update_feature_flags_disabling_guardian_clears_manual_review_policy_without_history` - `app::tests::update_feature_flags_disabling_guardian_clears_review_policy_and_restores_default` No documentation update is needed.
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run
codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Run the following on Mac or Linux to install Codex CLI:
curl -fsSL https://chatgpt.com/codex/install.sh | sh
Run the following on Windows to install Codex CLI:
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
Codex CLI can also be installed via the following package managers:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Business, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.