tmux extended-keys: Shift+Enter for Claude Code multi-line prompts - #11
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Claude Code's /terminal-setup refuses to run inside tmux, but that command isn't the fix — the requirement is tmux forwarding modified keys to the app. extended-keys on + terminal-features extkeys make tmux forward Shift+Enter to Claude Code, which auto-detects it (no manual keybinding). Terminal must send it (Ghostty does); mobile keeps the universal \ + Return fallback. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Why
Claude Code's
/terminal-setup(which wires up Shift+Enter for multi-line prompts) refuses to run inside tmux. But that command isn't the actual fix — the real requirement is that tmux forward modified keys to the app running inside it. Without that, Shift+Enter never reaches Claude Code and it submits instead of inserting a newline.What
Two lines in
files/tmux.conf:With these, tmux forwards Shift+Enter (and other modified keys) to Claude Code, which auto-detects it — no manual keybinding needed.
allow-passthrough onwas already present. Terminal support required: Ghostty sends these natively; mobile (Termius) doesn't reliably send Shift+modifier, so phones keep using the universal\+ Return (or Ctrl+J).Verified
Config loads clean on the box (tmux 3.4,
source-fileno errors);extended-keys onandextkeysconfirmed applied viatmux show;allow-passthroughand the touch-control toolbar both intact; no personal residue;make checkgreen. The end behavior (pressing Shift+Enter in Claude Code) requires a supporting terminal + keypress, so it's verified at the tmux-settings level and confirmed on-device from Ghostty.🤖 Generated with Claude Code