[BUG] Using the 2.1.156 version of the Claude Code for VS Code extension

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 I try to ask a question in the VSCode sidebar chat box, I am getting errors.

What Should Happen?

Claude should return an answer to my request, like it has in the past.

Error Messages/Logs

API Error: 400 {“detail”:”Error code: 400 - {‘type’: ‘error’, ‘error’,: {‘type’: ‘invalid_request_error’, ‘message’: ‘messages: Unexpected role “system”. The Messages APO accepts a top-level system parameter, not “system” as an input message role.’}, ‘request_id’: ‘req_vrtx_011CbWz8zxEN7geApH4fQSVy’}”}

Steps to Reproduce

I out a question into the chat box and hit return.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Worked in current version

Claude Code Version

2.1.156

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_