Claude in Chrome extension stops connecting spontaneously — MCP shows connected but extension reports not connected

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?

Description

The Claude in Chrome extension stops connecting to Claude Code spontaneously, with no clear trigger (no Windows update, Chrome update, or settings change). Once broken, it cannot be recovered through any standard troubleshooting.

What happened

• MCP shows √ connected for claude-in-chrome
• Every Chrome tool call returns: "A extensão ainda não está conectada"
• Session memory/conversation saving stopped at the same time

What I tried (none worked)

• Extension installed and enabled in chrome://extensions/
• Logged into claude.ai in Chrome with correct account
• Completely uninstalled and reinstalled Chrome extension
• Removed and re-added claude-in-chrome entry in mcpServers
• Restarted Claude Code multiple times
• claudeInChromeDefaultEnabled: true already set in settings.json
• Port 30900 confirmed listening (process: core) — MCP server is running
• No firewall or port conflicts found

Environment

• OS: Windows 11 / PowerShell

What Should Happen?

Chrome extension should connect and stay connected reliably across sessions. If connection drops, there should be a recoverable path without full reinstall.

Error Messages/Logs

MCP status: √ connected
Error when using Chrome tools: "A extensão ainda não está conectada. Verifique: 1. Extensão instalada? 2. Extensão ativa? 3. Logado no claude.ai? 4. Reiniciou o Chrome?"

netstat: TCP 127.0.0.1:30900 LISTENING (process: core)

Steps to Reproduce

1. Set up Claude Code with claudeInChromeDefaultEnabled: true
2. Use Chrome integration normally
3. Extension stops connecting spontaneously with no clear trigger
4. Restarting Claude Code and reinstalling extension does not fix it

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.104 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Session memory/conversation saving also stopped working at the same time, suggesting possible Claude Code state corruption or a shared root cause.