[BUG]

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Title: TUI right-click copies selection instead of showing context menu

Environment:

• Claude Code v2.1.226 (ARM64 native build)
• macOS 26.5.2 (25F84)
• Apple Terminal.app with xterm-256color
• No CLAUDE_CODE_DISABLE_MOUSE set

Description:

Right-clicking selected text in the Claude Code TUI immediately copies it to clipboard instead of showing the standard Terminal.app context menu (Copy, Paste, Select All, etc.).

Expected behavior:
Right-click on selected text should show the context menu with Copy/Paste/Select All options, as Terminal.app does natively.

Actual behavior:
Right-click copies the selected text to clipboard directly. No context menu appears.

Details:

• The TUI appears to enable xterm mouse tracking (DECSET 1000/1002), which causes Terminal.app to forward right-click as a mouse event to the app instead of handling it natively.
• The app then treats right-click as a copy action.
• This happens in both the text input area and the chat output area.
• Same behavior occurs with or without shell wrapper (squeez PTY).
• Terminal.app's native right-click context menu works correctly outside Claude Code.
• The issue was not present in an earlier session on the same day, suggesting possible state-dependent behavior in mouse protocol initialization.

Workaround:
Use keyboard shortcuts (Cmd+C / Cmd+V) instead of right-click context menu.

What Should Happen?

Suggested fix:
Either don't enable mouse tracking in the TUI (let the terminal handle mouse natively), or if mouse tracking is needed for other UI interactions, forward right-click events back to the terminal by temporarily disabling mouse tracking on right-click or dispatching the native context menu.Ran 1 shell command
USE env var.

Error Messages/Logs

Steps to Reproduce

Right-clicking selected text in the Claude Code TUI immediately copies it to clipboard instead of showing the standard Terminal.app context menu (Copy, Paste, Select All, etc.).

Expected behavior:
Right-click on selected text should show the context menu with Copy/Paste/Select All options, as Terminal.app does natively.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.226.

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_