shift+enter on tmux not working

not really sure if this is a tmux or opencode issue, but when I'm on tmux hitting shift+enter sends the request instead of creating a new line.

I totally nuke my tmux config just to make sure it's related to any of my packages on tmux, didn't work

unbind C-b

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

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

set-option -g default-terminal "tmux-256color"
set-window-option -g xterm-keys on
set-option -ga terminal-overrides ",xterm-ghostty:XT"

(also have passthrough on before)

My current workaround is this

# tmux config
bind-key -n S-Enter if-shell '[ "#{pane_current_command}" = "opencode" ] || [ "#{window_name}" = "opencode" ]' \
    "send-keys M-Enter" \
    "send-keys S-Enter"

# opencode config
{
  "keybinds": {
    "input_submit": "enter",
    "input_newline": "alt+enter,ctrl+j",

i just overhauled keybinds completely, check the readme; you can now configure newline to a different key, lmk if that's a solution for you!

fyi Windows Terminal + WSL2 + zsh shell + Arch Linux I also had an issue where the default shift + enter does not work (it submits the message to the LLM). But as @adamdottv mentioned, I reset the keymap to be ctrl + enter or ctrl + j (see below) and it works great! For others who may run into the same issue.

[keybinds]
leader = "ctrl+x"
input_newline = "ctrl+j,ctrl+enter"

NOTE: you see I added the leader keybind there because it appears as if you set any keybind, the leader keybind no longer is set by default so you have to explicitly add it. cc @adamdottv

FWIW shift+enter works for me in tmux and Ghostty.

I had the same issue with tmux and ghostty, the following workaround solved it for me.

# ~/.config/ghostty/config:  map shift+enter to ctrl+e
keybind = shift+enter=text:\x05

and

# ~.config/opencode/opencode.json: map ctrl+e to input_submit
{
  "keybinds": {
    "input_submit": "ctrl+e",
    "input_newline": "shift"

for kitty users, i added this to my kitty.conf

+ map shift+enter send_text all \x1b[13;2u

fix(developer): add defense-in-depth against git operation bypass (#168)

This did it for me (for claude code usage)

# Let tmux recognize Shift+Enter from iTerm2, then forward as CSI u bytes
set -s extended-keys on
set -as terminal-features 'xterm*:extkeys'
bind -n S-Enter send-keys -H 1b 5b 31 33 3b 32 75

@oricho123

@oricho123 excellent, thanks

I only needed the send-key config:

larrybotha/dotfiles@7a2a76b

i.e.

bind -n S-Enter send-keys -H 1b 5b 31 33 3b 32 75

my terminal-features are different to yours, and I don't seem to need extended-keys to have shift+enter create new lines, so I'm not sure what the minimal required configs are, but the key seems to be sending hex-encoded representation of the CSI key

environment:

MacOS
tmux
ghostty
neovim

newlines with shift+enter now working consistently regardless where opencode is opened

chore: bump version to 0.2.8 (anomalyco#167)

for kitty users, i added this to my kitty.conf

map shift+enter send_text all \x1b[13;2u

And likewise for wezterm users, I added this to my wezterm.lua:

config.keys = {
  {
    key = 'Enter',
    mods = 'SHIFT',
    action = wezterm.action.SendString('\x1b[13;2u'),
  },
}

for kitty users, i added this to my kitty.conf

map shift+enter send_text all \x1b[13;2u

Just FYI for future searchers...
This works, but you also have to enable extended-keys in your ~/.tmux.conf

set -g extended-keys on
set -g extended-keys-format csi-u

feat(es-app): tail-first transcript load (anomalyco#167)

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shift+enter on tmux not working #167

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shift+enter on tmux not working #167

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adamdotdevin commented on Jun 18, 2025

GitMurf commented on Jun 18, 2025

net commented on Jun 19, 2025

aminroosta commented on Aug 20, 2025

princejoogie commented on Jan 4, 2026

oricho123 commented on Feb 18, 2026

larrybotha commented on Feb 21, 2026

scottlittle commented on May 13, 2026

DePingus commented on Jun 13, 2026

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