FORGET PROMPT ENGINEERING — THE NEW SKILL IS BUILDING THE SYSTEM THAT DOES THE PROMPTING FOR YOU A quiet but significant shift is taking hold inside AI development circles, and it changes what it means to work with AI at a fundamental level. The concept is called loop engineering, and it emerged this week after Claude Code creator Boris Cherny appeared at Meta’s internal conference and opened a discussion about agents that prompt other agents. The idea: you stop being the person who types instructions into an AI and start being the person who designs the automated system that does the instructing. One agent constantly looks for architectural improvements in your codebase. Another hunts for duplicated code that can be unified. A third monitors for test failures. None of them wait for you. Google’s Addy Osmani named and formalized the practice in an essay posted this week, and the term spread fast. The implications are not small. If agents can prompt agents that then write, test, and ship code, the skill gap between someone who knows loop engineering and someone who does not is the same gap that existed between programmers and non-programmers twenty years ago. Prompt engineering had a multi-year run as the hot new skill. Loop engineering, according to the people building it, is the thing that replaces it and does not look back. Keywords: loop engineering, prompt engineering, AI agents, agentic AI coding 2026