Prompt Engineering vs Loop Engineering vs Graph Engineering: What Changes at Each Layer

The article frames prompt, loop, and graph engineering as stacked layers of AI control, not competing approaches.

Prompt engineering handles single model calls, loop engineering manages repeated agent behavior, and graph engineering coordinates multiple agents.

It traces the idea through Anthropic guidance, a June 2026 arXiv paper, and developer discussion, while noting graph engineering is still loosely defined.

The main takeaway: prompts are enough for simple tasks, but loops and graphs become useful for multi-step, unsupervised, or parallel workflows.