Rules vs Skills in Claude Code

If you have spent any time configuring an AI coding agent, you have probably figured out that rules and skills are different things. Rules are always loaded. Skills are invoked on demand. Rules handle recognition; skills handle procedure. Most people get this far and stop. The interesting problems start after you have internalized that distinction and started building on it. When your configuration grows past a handful of files, patterns emerge that the basic mental model does not prepare you for. I have been working with AI coding tools for over two years now, starting with Windsurf and building progressively more sophisticated systems with Claude Code. The rule-versus-skill distinction was foundational, but what I want to talk about is what comes next. The Failure Modes Tell You Everything The basic distinction is useful, but it becomes powerful when you frame it through failure modes. If you miss the moment to act, that is a rule problem. The rule was not in context when the trigger