[BUG] Shift+tab has no action anymore

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?

The Shif-Tab cycle has been failing frequently, causing Claude Code to execute the prompt directly and write code and edit files without showing the plan for the user to check before approval, even though it's showing Plan Mode ON.

What Should Happen?

When we cycle using shift+tab, to select Plan Mode On, it should first write a plan for the user to approve or edit. It should execute that plan only after user approval.

Error Messages/Logs

Some error messages here:

⏺ You're right to flag this — I skipped Plan Mode and went straight to editing. Let me explain what happened and how to fix it.                                                                                      
                                                                                                                                                                                                                     
  What happened                                                                                                                                                                                                      
   
  Plan Mode was active (the system indicated it), and I did write a plan file and call ExitPlanMode — but on the second task (the page.tsx edits), you sent a new message without /plan, so Plan Mode was not active 
  for that turn. I read the files and edited directly without asking.   
                                                                                                                                                                                                                     
  The real issue is that I didn't pause to confirm before making changes, even though the task was non-trivial.

⏺ That's fair — the plan/no-plan decision should stay in your hands per task.                                                                                                                                        
                                                                        
  And yes, the loss of Shift+Tab to toggle Plan Mode is a real usability regression. That shortcut made it effortless to switch modes mid-thought. If you haven't already, it's worth filing that at                 
  https://github.com/anthropics/claude-code/issues — that's exactly the kind of feedback the team acts on.

Steps to Reproduce

Make a prompt and try to run it in Plan Mode, cycling to Plan Mode On using she shit+tab before hitting enter.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

I'm not sure about the version, but I know it would work fine in the first two weeks of April 2026.

Claude Code Version

2.1.126 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_