From Prompt to Loop Engineering: How the Core AI Dev Skill Has Evolved

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The practice of guiding AI model behavior has been renamed three times in roughly as many years, moving from prompt engineering to context engineering to loop engineering. Prompt engineering, dominant around 2022–2024, focused on crafting a single well-worded request using techniques like few-shot examples and role framing. Context engineering, a term popularized by Andrej Karpathy around mid-2025, shifted the focus to everything inside the model's context window — system prompts, retrieved documents, and instruction files. The latest label, loop engineering, coined around June 2026 and attributed to Addy Osmani building on work by Boris Cherny and Peter Steinberger, centers on the generate-check-steer-retry cycle, arguing the verifier that decides when to stop is now the true bottleneck. Each rename reflects a genuine change in the unit of work being engineered, even as skeptics question whether the rebranding outpaces the underlying progress.

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