Multi-Agent Systems

Multi-agent architectures are a core pattern in modern agentic AI systems, especially for workloads that require reasoning, coordination, and iterative decision-making across multiple steps. In the context of generative AI on AWS, these architectures rely on multiple cooperating agents, each optimized for a specific responsibility. This lesson explores how multi-agent systems are designed and how they operate on AWS. The focus will be specifically on Strands Agents and AWS Agent Squad as AWS-aligned orchestration frameworks, explaining how they coordinate multiple agents and integrate with AWS-native services.

Insight: Multi-agent design is less about adding more LLM calls and more about adding structure, isolation, and measurable boundaries between responsibilities.

Understanding multi-agent systems in Agentic AI

In the context of agentic AI, multi-agent systems should be understood as orchestrated collections of agents rather than loosely connected independent actors. While each agent possesses its own reasoning capability, tools, and instructions, the overall system succeeds or fails based on how effectively those agents are coordinated. Orchestration logic becomes the central layer that assigns tasks, manages execution flow, and ensures that agents contribute meaningfully toward a shared objective.

Multi-agent systems divide responsibility across specialized agents to reduce cognitive load and improve reliability. In a single-agent design, a single agent must interpret intent, reason through decisions, invoke tools, and manage state across the entire workflow. As complexity grows, this approach breaks down, making system behavior harder to predict and manage. Multi-agent orchestration addresses this by assigning narrow, well-defined tasks to different agents, such as intent analysis, knowledge retrieval, or external action execution. Each agent operates within a limited context, while orchestration ensures their outputs are combined coherently. ...