[FEATURE] Add `/mode <mode>` command to switch Claude Code mode

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Shift + tab is not enterable on some terminals (e.g. from mobile). I know there have been previous feature requests about this but they've all been closed as a duplicate of https://github.com/anthropics/claude-code/issues/3429.

However the workarounds proposed in that issue only work for initializing Claude Code in a certain mode, not switching mid-session. For example, I like to start my sessions in plan mode, then switch to auto, and sometimes when Claude is going off the rails i like to turn auto mode off and ask it questions / re-plan.

Proposed Solution

Add a /mode <mode> slash command to switch the mode, e.g.:

• /mode default — ask before edits
• /mode plan — plan mode
• /mode edit (alias: /mode accept-edits) — auto-accept edits
• /mode auto — auto mode

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Interactive mode (TUI)

Use Case Example

Example of why I might want to switch mid-session:

1. Start my claude code in default mode to provide it with context and talk about a problem
2. Switch to plan mode when we're clear on the direction and approach
3. Switch to auto mode when plan is approved
4. Switch back to default mode if things aren't working as expected

Additional Context

_No response_