[BUG] claude_design MCP server fails with HTTP 404 on api.anthropic.com/v1/design/mcp

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?

Describe the bug
/doctor reports a failing MCP server named claude_design. Running /mcp shows:

Failed to reconnect to claude_design: HTTP 404 at https://api.anthropic.com/v1/design/mcp

Steps to reproduce

1. Run /doctor in Claude Code
2. Run /mcp to inspect

Expected behavior
Either the endpoint exists and the server connects, or claude_design is not included as a built-in server if the endpoint is not available.

Actual behavior
HTTP 404 from https://api.anthropic.com/v1/design/mcp. The server cannot be removed via /mcp UI or settings files — it does not appear in settings.json or settings.local.json, suggesting it is hardcoded in Claude Code itself.

Environment

• OS: Windows 11
• Claude Code version: 2.1.181

What Should Happen?

as title

Error Messages/Logs

Steps to Reproduce

as title

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.181

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_