Chrome MCP disconnects after Claude Code profile switch, requires multiple app relaunches

Bug Description

After switching Claude Code accounts (profile switch), the Claude-in-Chrome extension loses its connection to CC. mcp__Claude_in_Chrome__* tools become unavailable across ALL running sessions. Recovery requires relaunching the Claude desktop app 2-3 times.

Steps to Reproduce

1. Have multiple CC sessions active with Chrome MCP working
2. Switch CC account (log out / log in with different Google account in CC)
3. CC reinitializes — Chrome extension's session binding drops
4. All existing sessions: Chrome MCP tools fail silently (disconnected)
5. New sessions also don't connect until app is relaunched 1-3 times

Root Cause

The Claude-in-Chrome extension holds a WebSocket/native-messaging session bound to the previous CC account context. When CC switches accounts, it doesn't signal the extension to reconnect with the new context. The chromeTabGroupId stored in session JSONs (%APPDATA%\Claude\claude-code-sessions\{accountUuid}\{projectUuid}\local_{sessionId}.json) also becomes stale.

Expected Behavior

After profile switch, CC should automatically re-establish the Chrome MCP connection without requiring an app relaunch.

Workaround

1. Open chrome-extension://fcoeoabgenejglbffodgkkbkcdhcgfn/options.html — this reinitializes the extension's CC connection (fixes connection drop)
2. PreToolUse hook that propagates the freshest chromeTabGroupId across all sessions (fixes stale ID issue)

Both workarounds are client-side patches; the fix should be in CC's profile-switch flow.

Environment

• OS: Windows 11
• Claude Code: v2.1.101 (desktop / Electron)
• Frequency: 100% reproducible on every profile switch