[BUG] Claude in Chrome extension no longer registers MCP tools with Claude Code (VS Code)

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?

The mcp__claude-in-chrome__* tools are no longer available in Claude Code (VS Code extension). The browser instruction and tab context are still being injected into messages (the @browser tag works and I can see tab info), but when Claude tries to call any tool like mcp__claude-in-chrome__tabs_context_mcp, it returns "No such tool available."

This previously worked. It has stopped working on both Windows and Mac.

Environment:

Claude Code VS Code extension: v2.1.159
Claude in Chrome extension: v1.0.74
OS: Windows 10 (also reproduced on Mac)

What Should Happen?

mcp__claude-in-chrome__* tools are available and callable after the browser instruction is injected.

Error Messages/Logs

Steps to Reproduce

Install the Claude in Chrome extension (v1.0.74) in Chrome
Open Claude Code in VS Code
Type @browser:new_tab in the Claude Code chat
Claude receives the <browser_instruction> tag and tab context, confirming the extension is communicating
Claude attempts to call mcp__claude-in-chrome__tabs_context_mcp
Tool returns "No such tool available" — the MCP tools are not registered

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.156

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

Actual behavior: Tools are not registered. Calling them returns "No such tool available."