[BUG] TAB key toggles thinking mode instead of triggering bash autocomplete

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?

When using Claude Code's bash interface, pressing Tab toggles the thinking mode form instead of providing standard shell autocomplete functionality (command/path completion).

What Should Happen?

Pressing Tab should trigger bash autocomplete for completing file paths and commands (e.g., cd src/mod[TAB] → cd src/modules/).

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code bash interface
2. Start typing a command with a partial path (e.g., cd src/mod)
3. Press Tab key
4. Observe that the thinking mode form toggles instead of the path autocompleting

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

1.5

Claude Code Version

v2.0.1

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Environment:

• OS: macOS 15.6.1 (24G90)
• Claude Code version: v2.0.1 (worked on I guess it was 1.5.3)

Additional Context:

Tab completion is a fundamental shell interaction pattern for efficient file system navigation. Consider rebinding the thinking mode toggle to an alternative key combination
(e.g., Cmd+Shift+T) to restore standard bash Tab behavior.