ESSAYS9 min readMay 29, 2026
Agent Harness Explained: Why LLM Agents Need More Than Prompts and Tools
An LLM agent is not just a model, a prompt, and a list of tools. Reliable agents also need an execution and control layer around the model: runtime, tool interfaces, context management, lifecycle control, observability, verification, and governance. This article explains what an agent harness is and why it matters for building practical agent systems.
Daovera