Chapter
Big Idea 💡: From Prompts to Systems
Professional agentic engineering is not prompt engineering. It's engineering the system around the model.
vibe coding
Prompt after prompt, the model churns out code — the product sprawls, features drift, and quality slides into slop. Human intelligence is spent operating the model: all motion, little impact.
agentic system
The model runs inside a harness — workflows, guidelines, autotests, and guardrails — bouncing cleanly within well-engineered bounds. Human intelligence is freed for what matters: growing understanding and driving the impact of the work.
by Alexey Krivitsky, adapted from Denis Turkov
agentic-engineering.guide
Prompting alone is vibe coding: you poke the model and hope it converges. It can — but only under constant hand-steering, and left to prompts alone the product sprawls, features drift, and quality slides into slop, while your own attention drains into operating the model.
An agentic system puts the same model inside a harness: a workflow — the loop it runs — bounded by three constraints. Guidelines shape how it should behave, autotests give it ground truth from the environment, and guardrails are the limits it can't cross. Inside those bounds the model converges on its own, and your attention is freed for what actually matters: growing understanding and driving impact.
That's the whole shift. As the work gets harder, your effort moves from wording one prompt to engineering that harness — the prompt shrinks while the system around it grows. The eight tiers 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.
The harness has a shape — three nested loops, from the tight red-green cycle out to real-world impact: Loops of Agentic Engineering.