In AI, a harness (or "agent harness") is the software infrastructure that wraps around a large language model (LLM), allowing it to act on complex tasks rather than just responding to prompts. It provides the agent with tools (like code execution or web search), memory, guardrails, and execution loops. Many engineers emphasize that Agent = Model + Harness, meaning the infrastructure often determines the agent's real-world reliability. [1, 2, 3]
AI 駕馭工程（Harness Engineering）：在 AI 技術領域中，模型本身的能力很強，但為了讓它穩定執行任務、不胡言亂語，人類會建立一套約束機制、提示詞與控制系統，這個過程就稱為 Harness。 [1, 2]
