/m command crashes with TypeError: $.description.split is not a function

Description

The /m command (model selection) crashes with a JavaScript error, preventing users from changing models interactively within a session.

Error Message

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:
TypeError: $.description.split is not a function. (In '$.description.split(" ")', '$.description.split' is undefined)

Steps to Reproduce

1. Start Claude Code session
2. Run /m command to change model
3. Error occurs immediately

Environment

• Platform: macOS (Darwin 25.2.0)
• Claude Code version: Latest
• GitHub CLI version: 2.74.1

Expected Behavior

The /m command should display a model selection menu allowing users to switch between available models (opus, sonnet, haiku).

Workaround

Users can restart Claude Code with the --model flag:

claude-code --model opus

Additional Context

The error suggests that the code is attempting to call .split() on a description field that is either undefined or not a string type.