Clipboard copy not working over SSH + tmux in Ghostty

[Ayoola]

Description

OpenCode's copy function shows "copied to clipboard" notification but doesn't actually update the system clipboard when running over SSH inside tmux.

Description

OpenCode's copy function shows "copied to clipboard" notification but doesn't actually update the system clipboard when running over SSH inside tmux.

Environment

• Terminal: Ghostty on macOS
• Remote: SSH into Linux workstation
• Multiplexer: tmux with set -g set-clipboard on
• OpenCode pane: right side of a tmux split

Steps to Reproduce

1. SSH into a remote machine from Ghostty
2. Start tmux with a horizontal split – shell on the left, OpenCode on the right
3. Highlight/copy text from the OpenCode pane
4. Attempt to paste with Cmd+V

Expected

Copied text appears in the macOS clipboard.

Actual

OpenCode shows "copied to clipboard" notification, but Cmd+V pastes the previous clipboard content. The clipboard is not updated.

Notes

• Copying from the shell pane in the same tmux session works correctly – clipboard is updated and Cmd+V pastes the new content.
• This suggests tmux and Ghostty OSC 52 passthrough are configured correctly, and the issue is specific to how OpenCode emits the OSC 52 sequence.

Plugins

N/A

OpenCode version

1.2.15

Steps to reproduce

1. SSH into a remote machine from Ghostty
2. Start tmux with a horizontal split – shell on the left, OpenCode on the right
3. Highlight/copy text from the OpenCode pane
4. Attempt to paste with Cmd+V

Screenshot and/or share link

No response

Operating System

MacOS 26.3

Terminal

Ghostty

[github-actions]

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

• Clipboard copy fails in Zellij and other multiplexers (OSC52 written to stdout instead of /dev/tty) #12082: Clipboard copy fails in Zellij and other multiplexers (OSC52 written to stdout instead of /dev/tty) — same root cause (OSC52 not reaching the terminal emulator through a multiplexer), and includes a detailed technical analysis and proposed fix
• Copy Text "Copied to clipboard" does never work #7048: Copy Text "Copied to clipboard" does never work — same symptom (notification appears but clipboard is not updated) in Ghostty

If your issue is covered by one of these, consider adding a comment there with your specific environment details (SSH + tmux + Ghostty) rather than a new issue.

[Ayoola]

This resolved my issue @thdxr:

Ghostty: allow OSC52 clipboard access

copy-on-select = clipboard
clipboard-read = allow
clipboard-write = allow

tmux: allow OSC52 passthrough

set -g allow-passthrough on

Source: https://petar.dev/notes/copypaste-for-opencode-with-ghostty-and-tmux/

[vcastellm]

Thx @Ayoola that fixed the issue for me

[hqhq1025]

If you're on macOS, clipaste may help — it's a background daemon that normalizes the screenshot clipboard so image paste works in terminal AI tools. Also supports SSH remote paste.

brew install hqhq1025/clipaste/clipaste
brew services start clipaste

For SSH remote: clipaste ssh-setup user@host

GitHub: https://github.com/hqhq1025/clipaste