[BUG] Syntax Error - Error message: SyntaxError: Unexpected token 'S', "[SandboxDeb"... is not valid JSON - Location: Top of chat box - VSCode version - Container environment (Codespaces/Dev Container)

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?

Error message: SyntaxError: Unexpected token 'S', "[SandboxDeb"... is not valid JSON

• Location: Top of chat box
• VSCode version
• Container environment (Codespaces/Dev Container)

What Should Happen?

Claude code chat in vs code should work.

Error Messages/Logs

Steps to Reproduce

?

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.8.47

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_