Orchestration is the layer that coordinates the moving parts of an agent: the order in which steps run, which tools and sub-agents are invoked, how results flow between them, and what happens when a step fails or stalls. It turns a sequence of model decisions and actions into a managed process rather than a single in-memory function call.
Why orchestration matters
An agent is rarely one model call. It reasons, calls a tool, reads the result, calls another, perhaps hands off to a sub-agent, and eventually returns an answer. Each of those steps can be slow, can fail, or can depend on an external system that is briefly unavailable. Running that whole sequence inside one process and hoping it finishes is fine in a notebook, but it leaves no answer to the questions production raises: what happens if the process is killed midway, how is a run paused while a person reviews an action, and how is progress made visible while it runs.
Orchestration is the answer to those questions. It is the difference between a script that either returns or throws and a managed process whose position, history, and pending work are tracked explicitly. Without it, every failure becomes a restart from the first token, every pause loses state, and every incident is debugged from logs alone.
How it works
An orchestration layer sits between the agent definition and the machines that execute it. A typical division of responsibilities looks like this:
- The agent definition — the model, the tools, the control flow — is compiled into a workflow the orchestrator can schedule.
- The orchestrator decides which step runs next and dispatches it to an available worker.
- As each step completes, its result is persisted to durable storage so the run’s position is never held only in process memory.
- If a worker dies mid-step, the orchestrator reassigns the work to a healthy worker, which continues from the last completed step.
- The same coordinator can pause a run for human approval, retry a transient failure, fan work out to sub-agents, and expose the live state for observation.
Because the coordinator owns the control flow, the behavior of the system is governed in one place rather than scattered across processes that each hold part of the picture.
Orchestration vs. a framework
These are easy to conflate because both shape how an agent runs. A framework is a library you write against to define an agent and its logic. Orchestration is the runtime that executes that definition dependably — persisting state, retrying, scheduling, and recovering. A framework without orchestration runs the loop in memory and stops there; orchestration without a framework has nothing to run. In practice an orchestration layer often executes agents authored in several different frameworks, treating each as a definition to coordinate.
In practice
A durable, observable runtime acts as the orchestration layer for an agent: it persists each step server-side, reassigns work when a worker fails, and coordinates several agents in a multi-agent system. This is what gives an agentic workflow its reliability and what makes human-in-the-loop pauses possible without losing progress. For the rationale behind running agents this way, see why durable agents.