Kitty keyboard protocol escape sequences leak into input (e.g. Caps Lock → [57358u)
Status Fixed / completed
Maintainer reply None cached
Workaround ✓ Mentioned in description ↑
Activity 2 comments · opened Mar 26, 2026 · closed Apr 18, 2026
Description
When using Claude Code in VS Code's integrated terminal with the Kitty keyboard protocol enabled (default in recent VS Code versions), pressing non-functional keys like Caps Lock produces raw escape sequences (e.g. [57358u) that leak into the input field.
Steps to Reproduce
- Open Claude Code in VS Code integrated terminal (v1.113.0+)
- Ensure
terminal.integrated.keyboard.protocolis set toauto(default) - Press Caps Lock
Expected Behavior
Caps Lock (and other non-bound modifier keys) should be silently ignored.
Actual Behavior
The raw Kitty protocol escape sequence [57358u appears in the input field each time Caps Lock is pressed.
Environment
- Terminal: VS Code integrated terminal 1.113.0
- TERM: xterm-256color
- Shell: zsh 5.9
- OS: Linux (Ubuntu)
Workaround
Set terminal.integrated.keyboard.protocol to none in VS Code settings.
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