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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.