New line does not work with Shift+Enter or Ctrl+j

In the TUI, the new line keybind does not work as mentioned in the docs "input_newline": "shift+enter,ctrl+j",. Thought this might have had something to do with some clashes with terminal or tmux commands but it still does not work without tmux also. When the keybind is used, it just sends the text like the "input_submit": "enter", keybind.

versions
Arch Linux 6.15.3
tmux 3.5a
Ghostty 1.1.3
opencode v0.1.123

The keybind works fine for me in kitty (v0.21.2) with and without tmux (v3.4). In ghostty (v1.0.0-dev+0000000), I can insert a new line by simply pressing shift+enter with or without tmux. If I use shift+enter,ctrl+j, two newlines are inserted.

opencode version 0.1.123

as a workaround, you can configure a custom keybind for newline

Weirdest thing, it wasn't working for me (macos, ghostty, tmux) so I added ctrl+j alongside shift+enter, and suddenly shift+enter worked as well. I'm certain opencode was on 0.1.124 the whole time despite restarting it.

Edit: I wasn't paying attention, I was detached from tmux 😅

Same issue, only commenting for visibility
macos v15.5
tmux v3.5a
ghostty v1.1.3
fish v4.0.2
opencode v0.1.126

Pressing Shift + Enter for me simply sends the message to the model

With tmux detached,

Shift+enter and ctrl+j works to create a new line

With tmux attached,

Shift+enter submits the prompt
ctrl+j does nothing when pressing the keybind

I tried to unbind the shift+enter keybind in tmux and in ghostty and it still does not work in the tmux. I tried adding custom keybinds and no luck with tmux attached.

tmux 3.5a
Ghostty 1.1.3
opencode v0.1.123

Same issue happens with Zellij. Outside of tmux or zellij, in a normal shell in Ghostty, the Shift+Enter combination in open code works.

zellij 0.42.2
opencode 0.1.126
Ghostty 1.1.3

so interesting, both keybinds work for me on macos, ghostty, with and without tmux (haven't tried zellij but i will). anyone care to share tmux configs?

unbind r
bind r source-file ~/.tmux.conf

set -g prefix C-s

set -g mouse on
set-option -g status-position bottom
set -g base-index 1
setw -g pane-base-index 1

# Pane navigation
bind-key h select-pane -L
bind-key j select-pane -D
bind-key k select-pane -U
bind-key l select-pane -R

# Window navigation (without prefix)
bind-key -n M-h previous-window
bind-key -n M-l next-window

# Switch to windows using Alt + number (no prefix)
bind-key -n M-1 select-window -t :1
bind-key -n M-2 select-window -t :2
bind-key -n M-3 select-window -t :3
bind-key -n M-4 select-window -t :4
bind-key -n M-5 select-window -t :5
bind-key -n M-6 select-window -t :6
bind-key -n M-7 select-window -t :7
bind-key -n M-8 select-window -t :8
bind-key -n M-9 select-window -t :9
bind-key -n M-0 select-window -t :0

#Plugins setup
set -g @plugin 'tmux-plugins/tpm'
# set -g @plugin 'catppuccin/tmux#v0.3.0'
set -g @plugin 'tmux-plugins/tmux-resurrect'
set -g @plugin "adibhanna/gruvbox-tmux"
set -g @gruvbox-theme dark # dark or light
set -g @plugin 'christoomey/vim-tmux-navigator'

# set -g @catppuccin_window_left_separator ""
# set -g @catppuccin_window_right_separator " "
# set -g @catppuccin_window_middle_separator " █"
# set -g @catppuccin_window_number_position "right"
#
# set -g @catppuccin_window_default_fill "number"
# set -g @catppuccin_window_default_text "#W"
#
# set -g @catppuccin_window_current_fill "number"
# set -g @catppuccin_window_current_text "#W"
#
# set -g @catppuccin_status_modules_right "directory session"
# set -g @catppuccin_status_left_separator  " "
# set -g @catppuccin_status_right_separator ""
# set -g @catppuccin_status_fill "icon"
# set -g @catppuccin_status_connect_separator "no"
#
# set -g @catppuccin_directory_text "#{pane_current_path}"
#
# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
run '~/.tmux/plugins/tpm/tpm'

tmux version tmux 3.5a

set -g mouse on
set -sg escape-time 10
setw -g prefix C-s

unbind r
bind r source-file ~/.tmux.conf \; display "Reloaded!"

setw -g mode-keys vi
bind-key h select-pane -L
bind-key j select-pane -D
bind-key k select-pane -U
bind-key l select-pane -R
bind-key s choose-session

# Plugins
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-sensible'
 
set -g @plugin 'tmux-plugins/tmux-resurrect'
set -g @plugin 'tmux-plugins/tmux-continuum'
set -g @resurrect-strategy-nvim 'session'
set -g @continuum-restore 'on'
set -g @resurrect-save 'Z'

# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
run '~/.tmux/plugins/tpm/tpm'

tmux version 3.5a

set-option -sa terminal-overrides ",xterm*:Tc"
set-option -g focus-events on
set -g mouse on

# Start windows and panes at 1, not 0
set -g base-index 1
set -g pane-base-index 1
set-window-option -g pane-base-index 1
set-option -g renumber-windows on

# Shift arrow to switch windows
bind -n S-Left  previous-window
bind -n S-Right next-window

# Reorder windows with Shift Left/Right
bind-key -n C-S-Left swap-window -t -1\; select-window -t -1
bind-key -n C-S-Right swap-window -t +1\; select-window -t +1

# Move between panes
bind -n C-h select-pane -L
bind -n C-j select-pane -D
bind -n C-k select-pane -U
bind -n C-l select-pane -R

# Resize panes
bind -n C-M-h resize-pane -L 5
bind -n C-M-j resize-pane -D 5
bind -n C-M-k resize-pane -U 5
bind -n C-M-l resize-pane -R 5

set -g @plugin 'dracula/tmux'

set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-sensible'

set -g @dracula-plugins " "

set -g @dracula-show-flags false
set -g @dracula-show-empty-plugins false
set -g @dracula-show-left-icon session

here's mine:

set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-sensible'
set -g @plugin 'Nybkox/tmux-kanagawa'

unbind C-b
set -g prefix C-a
bind C-a send-prefix

set -g base-index 1
setw -g pane-base-index 1
set -g mouse on

set -g @kanagawa-plugins "time"
set -g @kanagawa-show-powerline true
set -g @kanagawa-show-left-icon session
set -g @kanagawa-time-format "%R"
set -g @kanagawa-refresh-rate 2
set -g @kanagawa-theme 'dragon'
set -g @kanagawa-ignore-window-colors true

if "test ! -d ~/.tmux/plugins/tpm" \
   "run 'git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm && ~/.tmux/plugins/tpm/bin/install_plugins'"

run '~/.tmux/plugins/tpm/tpm'

If it helps, I didn't have this issue until I just updated to MacOS 15.5. I was on 14.n (not sure which sorry) prior to this.

There was no update of OpenCode between it working and not working.

shift+enter fails for me when inside of tmux but works fine outside of it.

Thanks.

If it helps, gemini-cli has the same issue :)

shift+enter fails for me on ubuntu 22.04 inside Terminator v2.1.1 but ctrl+j works fine.

i fixed Shift+Enter on MacOS, Ghostty and tmux 3.5a by setting following option in my .tmux.conf:

set -g extended-keys always

as far as I could tell while testing, this replicates the exact behaviour I would get without running tmux.

i fixed Shift+Enter on MacOS, Ghostty and tmux 3.5a by setting following option in my .tmux.conf:

set -g extended-keys always
as far as I could tell while testing, this replicates the exact behaviour I would get if I without running tmux.

Confirmed! This fixed it <3 :)

i fixed Shift+Enter on MacOS, Ghostty and tmux 3.5a by setting following option in my .tmux.conf:

set -g extended-keys always

as far as I could tell while testing, this replicates the exact behaviour I would get if I without running tmux.

Yup! This fixed it. Closing this issue

Fix shift+enter while in tmux

fix: auto-start dev servers in tmux instead of blocking (anomalyco#344)

fix: update hook integration tests for auto-tmux-dev behavior

chore(aur): update PKGBUILD for 0.8.5 (anomalyco#344)

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New line does not work with Shift+Enter or Ctrl+j #344

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New line does not work with Shift+Enter or Ctrl+j #344

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