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tmux: escape sequences output on startup switch tabs #22210
Description
Description
When running opencode in tmux, terminal escape sequences are output on startup that cause tmux to switch to a different tab/window.
Steps to reproduce
- Open tmux with multiple windows/tabs
- Run
opencodein one tab - Observe: tab switches to a different window, and random characters appear
Actual output
?1016;2$y2027;1$y2031;1$y1004;2$y2004;1$y2026;2$y
These are ANSI terminal status query sequences (?NNN;NN$y format). They appear to be capability queries from the VS Code extension host initialization.
Workaround
Running echo | opencode suppresses the issue because opencode detects non-TTY stdin.
Environment
- macOS (Darwin)
- tmux
- zsh
Reacted by Wei Zhong and Evgenii Morozov
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github-actions commentedon Apr 12, 2026
This issue might be a duplicate of existing issues. Please check:
allow-passthroughoption ison#15744: opening opencode emits garbled text when tmuxallow-passthroughoption ison(same symptom of escape sequences and tab switching in tmux)Consider adding any additional context you have to those issues instead.
github-actions commentedon Jul 3, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.