24 min read
Loop Engineering vs Prompt Engineering: A Practical 2026 Guide
Learn how loop engineering turns strong prompts into reliable AI agent workflows with tools, evaluation, stop conditions, budgets, and human approval.
- Prompt engineering remains essential: it defines the goal, context, constraints, tools, and output contract for each model decision.
- Loop engineering adds orchestration around those prompts: state, tool calls, evaluation, retries, budgets, approval gates, observability, and explicit exit conditions.
- The safest starting point is usually one agent in a small bounded loop, not an unrestricted multi-agent system. Expand autonomy only after traces and repeatable evaluations show that the simpler design is insufficient.