unable to enable developer MCP in Claude Desktop

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 unable to enable developer MCPs for the last 30 minutes. They appear to be running, but I can't switch the toggle on, even though I haven't made any changes.

What Should Happen?

RAS

Error Messages/Logs

RAS

Steps to Reproduce

RAS

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.0.2339

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_