I Made It Write the Rule. Three Minutes Later, Claude Code Broke It.
I spent about thirty hours with Claude Code, putting a small home-made app onto a home server. The model behind it is Claude Sonnet 5. Below, “Claude Code” means the tool; “Sonnet 5” means the habits in its output. For those thirty hours I checked every line it produced. Here are the patterns that kept coming back. This is about technical mistakes, not about how smart it is. This is a record of Sonnet 5. I haven’t used Opus or Fable, so I can’t speak to those. ...