Agent KBA shared vocabulary for agentic systems

Agents, harnesses, loops and graphs, orchestrators and control planes. Clear definitions, how they fit together, and the open-source projects behind them.

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Agent and harness

A model choosing its next action, and the runtime that makes that possible, from context and tools to permissions and sessions.

Loop and graph

Let the model decide the next step, or design the control flow yourself. When to use each, and how to combine them.

Orchestrator and control plane

Coordinating many agent runs, and governing the whole fleet with versions, policy, gateways, traces and evals.