Track 2 · Building with models
Agents, Tools & Harnesses
A chatbot answers questions. An agent takes actions. Between the model and the real world sits a harness: the loop, the tools, the permissions, and the state. This course teaches that layer from first principles so you can design or debug production agent systems.
Course boundary
This course owns the runtime harness: loops, tool execution, permissions, state, and failure recovery. Prompting L06 covers how to write tool schemas and descriptions in context. Here we cover what the harness does with those calls after the model emits them. Read both; neither replaces the other.