Appendix E — How to Write a Skill

A skill is a model of a domain an agent triggers into

A skill is not a prompt, and it is not a checklist. It is a model of a domain — the frame an agent loads when a task in that domain arrives, so it reasons through the domain's own abstractions instead of from scratch. You met three of them earlier in this book: the skills that let the fleet write its prose, harden its own substrate, and operate itself. Here is how they were made.

All three were built the same way. A skill is not a bag of instructions that grew by accretion. Each of the book's skills started from one abstraction, layered independent facets on it, and tied them together with a governing principle. That construction is itself a reusable pattern: name it and you can write the next skill deliberately instead of by feel.

This appendix names that pattern as a three-step recipe and grounds each step in the three self-* skills you already met. Read the Skills chapter for what those skills do; read on here for how they were built.