Six Principles for Agent Systems That Don't Hallucinate

Why this article exists Agentic development with LLMs in 2026 is no longer an "interesting experiment". It is its own engineering discipline. By an "agent" I mean a program built on top of a language model that performs a structured task inside a product rather than merely replying to a user in chat: it reads code, makes decisions, writes files, calls external APIs, and returns a result. I join product teams where three to five such agents already work in parallel: code review bots, content clas