[BUG] Session titles show raw XML tags after using slash commands

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 slash commands like /clear or /plugin, the session title in the /resume picker shows raw XML markup instead of a readable title:

<command-name>/clear</command-name> <command-message>clear</command-message> <command-args></command-args>

What Should Happen?

Session should have a readable title (or show the previous message before the command)

Error Messages/Logs

Steps to Reproduce

Start a Claude Code session
Run /clear or any other "/" slash command
Exit the session
Run claude
Call /resume command
Observe the session title shows raw XML tags

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.31

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

<img width="893" height="447" alt="Image" src="https://github.com/user-attachments/assets/5f677f85-ed75-4b5b-8d2f-cd84d1f16abe" />