[BUG] Claude in Chrome: MCP tools cannot access instagram.com even after approving it in extension settings

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 Claude in Chrome extension MCP tools (computer/screenshot, navigate, javascript_tool, read_network_requests, get_page_text, read_page) all return "Permission denied for this action on this domain" or "Navigation to this domain is not allowed" for instagram.com.
The extension's own "Approved Sites" settings page (options.html#permissions) allows adding instagram.com, but this setting has NO effect on the MCP server's domain whitelist. The two systems are completely separate and the MCP whitelist appears to be hardcoded.

What Should Happen?

Approved sites should unlock MCP tool access to those domains

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code / Claude in Chrome
2. Ask Claude to navigate to instagram.com
3. Even after adding instagram.com to "Approved Sites" in extension settings, all MCP tool calls return Permission Denied

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

4.6

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_