[BUG] Session sidebar preview shows internal caveat message instead of user message.

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?

I've been primarily using the Claude Code CLI in a VSCode terminal.

It's been recommended to run the /clear command when changing topics, so I've been doing so.

I noticed today that the VSCode extension is also tracking the conversations I'm having in my CLI. Which is fine. And each time I run /clear, I get a new session in the Sessions sidebar. Which is also fine.

What I'm writing about is the fact that the title of each session I get after running /clear is

Caveat: The messages below...

Which isn't helpful for reviewing previous sessions.

What Should Happen?

When a session is created with /clear in the CLI, the VSCode extension should ignore the internal caveat message. Per Claude's wording: "The fix would be for the extension to skip system/caveat messages when generating the preview text."

Error Messages/Logs

Steps to Reproduce

1. Open a terminal in VSCode with the Claude Code extension installed.
2. Start a conversation with Claude in the terminal window
3. Refresh the Sessions bar in the CHAT sidebar in VSCode to see a reasonable session title displayed
4. Run /clear in the terminal window and start a new conversation
5. Refresh the Sessions bar in the CHAT sidebar again
6. See a new session with a title of "Caveat: The messages below..."

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.77

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_