Not sure if it is the AI client not responding to the error proeprly, or the playwright mcp not fixing the session
After calling browser_navigate it returns
Error: Browser is already in use for /Users/fraser.langton/Library/Caches/ms-playwright/mcp-chrome-profile, use --isolated to run multiple instances of the same browser
But then it just keeps opening tabs every second until you stop the agent
fixed by force quitting chrome