[BUG]

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?

Subject: MCP servers claude-in-chrome and mcp-registry fail to connect after latest update
Description:
Since updating to the latest version of Claude Desktop, two built-in MCP servers fail to connect on every startup, producing error popups:

"Could not connect to MCP server mcp-registry"
"Could not connect to MCP server Claude in Chrome"

Root cause identified: The MCP server log at %APPDATA%\Claude\logs\mcp-server-claude-in-chrome.log shows:
npm error 404 Not Found - GET https://registry.npmjs.org/@anthropic-ai/claude-in-chrome-mcp - Not found
The package @anthropic-ai/claude-in-chrome-mcp does not exist on the public npm registry. Claude Desktop is attempting to fetch it via npx at startup but failing. This worked correctly until 21 February 2026.
Environment:

OS: Windows 11
Claude Desktop: latest version (as confirmed by Check for Updates)
Node: v24.11.0
npm: v11.6.1

Impact: Error popups on every startup. Claude in Chrome browser automation non-functional. mcp-registry unavailable.
Note: All user-configured MCP servers (Filesystem, Desktop Commander, SSH) are unaffected and running normally.

What Should Happen?

There should be no mcp error reports on starting Claude Desktop.

Error Messages/Logs

"Could not connect to MCP server mcp-registry"
"Could not connect to MCP server Claude in Chrome"

The MCP server log at %APPDATA%\Claude\logs\mcp-server-claude-in-chrome.log shows:
npm error 404 Not Found - GET https://registry.npmjs.org/@anthropic-ai/claude-in-chrome-mcp - Not found

Steps to Reproduce

Start Claude Desktop in Windows 11 with Claude in Chrome.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Prior to Claude 1.1.3963 (71a7ae) 2026-02-21T16:19:56.000Z (Claude Desktop)

Claude Code Version

N/a

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

<img width="161" height="43" alt="Image" src="https://github.com/user-attachments/assets/d681ab36-d560-4d30-ad72-d13bb4557007" />