Harness Engineering
The discipline of designing the runtime system wrapped around a model: the agent loop, tool definitions, memory and state, permissions and sandboxing, guardrails, and observability. Two products built on the same model can behave radically differently depending on the harness (see Chapter 3.4).
Want the full picture? This term comes from GenAI for Business, a complete free book on generative AI strategy and implementation by Prof. Shubin Yu (HEC Paris).