Chapter

Big Idea 💡: From Prompts to Systems

Professional agentic engineering is not prompt engineering. It's engineering the system around the model.

That system isn't a line — it's three nested loops (the value-factory model). A tight coding loop (red → green → refactor) sits inside a feature loop (specify → refine → verify), inside an impact loop (opportunities → hypothesis → impact). Each wider loop is slower, higher-stakes, and longer to close:

As the work gets harder, your effort moves from wording one prompt to engineering these loops so they close on their own — the prompt shrinks while the system around it grows. The eight tiers below are that climb: from a single request (T1) to whole loops running autonomously in production (T8). Learn the ladder and the 60 tips fall into place.