Hooks are guarantees, skills are knowledge, subagents are other people.
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My Claude Code config now holds two hooks, ten skills, and three custom subagents, and most of them started life in the wrong layer. The instruction the model followed nine times out of ten lived in a prompt until I accepted that nine out of ten is a coin I lose every day. The workflow I pasted into chats became a skill. The bulk work that was draining my priciest model's quota became a fleet of cheaper agents. Same features, different failure modes. Taming Claude Code Sessions · Part 6 of 6 1 2 3 4 5 6 🧪 Tested with Claude Code 2.1.x · macOS The four layers # Claude Code has four extension points, and they answer four different questions: