The AI Engineering Maturity Model (Five Names From Prompts to Graphs)
The AI industry has named five engineering terms in four years. Prompt engineering came in 2022, context engineering in June 2025, then harness, loop, and graph engineering through 2026. The layers of work are real. Some of the names are marketing. Context engineering has frontier-lab backing. Harness engineering is gaining credible adoption. The two newest terms are still contested. A business leader should map problems to layers, not chase job titles.