Use the superpowers plugin. It's a game changer. You start by building out a spec defining the work you want to be done, then claude writes a detailed implementation plan. It can easily work for hours without interruption, and the process integrates testing (TDD when possible) and review steps along the way. I even did one fairly complex POC for work that had claude implementing for almost 3 days straight, with me stopping it and handing off to a new session when context hit about 800k. The process is slower and more methodical than the way claude works by default but the output is much better.