Claude VS Code Extension Broken on Windows: The Complete Fix Guide The Claude VS Code extension stops working on Windows far more often than it does on macOS or Linux, and the error messages are almost always useless. “Extension host terminated unexpectedly.” “Failed to connect.” A spinning loader that never resolves. If you’ve burned an afternoon on this, you are not alone. This guide documents every known root cause and the exact steps to fix each one, so you can get back to using Claude as your code copilot instead of debugging your tools. ...