Copy-on-Select fails when running opencode via Tmux in Kitty terminal (Linux) #9942

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1. geofarmbuilder

   added

   bugSomething isn't workingSomething isn't working

   on Jan 22, 2026
2. github-actions

   assigned

   kommander

   on Jan 22, 2026
3. github-actions

   added

   opentuiThis relates to changes in v1.0, now that opencode uses opentuiThis relates to changes in v1.0, now that opencode uses opentui

   on Jan 22, 2026
4. github-actions commented on Jan 22, 2026

   

   github-actionsBot

   on Jan 22, 2026 – with GitHub Actions

   Contributor

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   This issue might be a duplicate of existing issues. Please check:

   • Windows & Ubuntu: impossible to paste API key after /connect (Ctrl-V / Ctrl-Shift-V / right-click all fail, no hints) #9922: Windows & Ubuntu: impossible to paste API key after /connect (Ctrl-V / Ctrl-Shift-V / right-click all fail, no hints) - Related to clipboard/paste functionality failures in terminal environments
   • Can't open TUI running on a remote Omnissa Horizon machine #9903: Can't open TUI running on a remote Omnissa Horizon machine - Mentions Kitty terminal issues on remote machines and tmux with similar terminal rendering problems

   Feel free to ignore if none of these address your specific case.
5. stonematt commented on Feb 3, 2026

   

   stonematt

   on Feb 3, 2026

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   I can confirm this is also happening in Ghostty with tmux on Mac on local files. Here's the observed behavior:

   without tmux

   1. open Ghostty -> opencode
   2. start a session, get a response
   3. highlight text -> see banner pop up that says "Copied to Clipboard"
   4. Paste - WORKS!

   with tmux

   1. open Ghostty -> start tmux -> opencode
   2. start a session, get a response
   3. highlight text -> see banner pop up that says "Copied to Clipboard"
   4. Paste - NOT THE COPIED TEXT - FAIL!

   this worked until a few days ago. This feels like a regression.

   ➜ opencode --version
   1.1.49

   Here's my tmux.conf (nothing too special):

   # Enable mouse control (clickable windows, panes, resizable panes)
   set -g mouse on
   
   # Set history limit
   set -g history-limit 50000
   
   # for neovim
   set -sg escape-time 10
   
   # Key bindings to for intuitive splits
   bind | split-window -hc "#{pane_current_path}"
   bind - split-window -vc "#{pane_current_path}"
   
   # Improve window navigation
   bind-key -n C-Left  previous-window
   bind-key -n C-Right next-window
   # Enable vim-style pane navigation
   bind-key -n C-h select-pane -L
   bind-key -n C-l select-pane -R
   bind-key -n C-j select-pane -D
   bind-key -n C-k select-pane -U
   
   # Resize panes without prefix using Ctrl+Shift+Arrow keys
   bind-key -n C-S-Up resize-pane -U 5
   bind-key -n C-S-Down resize-pane -D 5
   bind-key -n C-S-Left resize-pane -L 5
   bind-key -n C-S-Right resize-pane -R 5
   
   
   # Enable vi mode for copy mode
   setw -g mode-keys vi
   
   # Set default terminal
   set -g default-terminal "screen-256color"
   
   # status bar
   set -g status-right "#(pomo)"
   set -g status-style "fg=#665c54"
   set -g status-left-style "fg=#928374"
   
   set -g status-bg default
   set -g status-position top
   set -g status-interval 1
   set -g status-left ""
   
   # disable status
   # set -g status off
   # set -g status on
   
   # count the panes from 1
   set -g base-index 1
   setw -g pane-base-index 1
   
   # reload configuration
   bind-key -r r source-file ~/.tmux.conf
   
   # Plugin manager
   set-environment -g TMUX_PLUGIN_MANAGER_PATH ~/.tmux/plugins/
   
   # List of plugins
   set -g @plugin 'tmux-plugins/tpm'
   set -g @plugin 'tmux-plugins/tmux-sensible'
   set -g @plugin 'christoomey/vim-tmux-navigator'
   
   # Other examples:
   # set -g @plugin 'github_username/plugin_name'
   # set -g @plugin 'github_username/plugin_name#branch'
   # set -g @plugin 'git@github.com:user/plugin'
   # set -g @plugin 'git@bitbucket.com:user/plugin'
   
   # Initialize TMUX plugin manager
   run-shell '~/.tmux/plugins/tpm/tpm'
   
6. github-actions commented on Apr 5, 2026

   

   github-actionsBot

   on Apr 5, 2026 – with GitHub Actions

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   To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.
7. github-actions

   closed this as completedon Apr 5, 2026
8. emsi commented on May 8, 2026

   

   emsi

   on May 8, 2026

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   No properly behaving terminal application depends on external tools for text selection and copy. On X11 no-one even needs to "copy" as selected text is immediately available for being pasted. opencode is completely broken, does not work over remote session, inside container etc. It generally is misbehaving application that damages your terminal and should be avoided.

   👀React with 👀1Reacted by nickjennion