Supervisor vs. Pipeline: Choosing the Right Multi-Agent Pattern

When designing a multi-agent system, one of the most consequential architectural decisions is choosing your orchestration pattern. The two dominant approaches — supervisor and pipeline — each have distinct strengths that make them suited for different problem types. Choosing wrong can lead to brittle systems that are hard to maintain and scale.

In the pipeline pattern, agents are arranged in a linear sequence where the output of one agent feeds directly into the next. Think of an assembly line: Agent A processes raw input, passes it to Agent B for enrichment, then Agent C for analysis, and finally Agent D for output generation. Each agent has a single, well-defined responsibility.

Pipelines excel when your process has clear, sequential steps with predictable data transformations. Document processing is a classic pipeline use case: ingestion → extraction → validation → classification → output. The advantages are simplicity, predictability, and easy debugging since you can examine the state between any two agents.

The supervisor pattern uses a central orchestration agent that dynamically decides which specialized agents to invoke and in what order. The supervisor receives the input, assesses the task, delegates to appropriate agents, collects their results, and may make additional delegation decisions based on intermediate outputs.

Supervisors shine when the process requires dynamic decision-making. Customer service is a good example: a supervisor agent might route a simple question to a FAQ agent, an account issue to a billing agent, and a complex complaint to an escalation agent. The key advantage is adaptability — the system can handle novel situations by composing agents in new ways.

In practice, we often use hybrid architectures. A supervisor might manage the top-level workflow while individual tasks within that workflow use pipeline patterns. For example, our MedAgent system uses a supervisor to orchestrate the overall patient journey, but the triage scoring step itself is a pipeline of specialized clinical agents. The right choice depends on your specific requirements for flexibility, predictability, and scalability.