Orchestrator-Worker Pattern
definition
The orchestrator-worker pattern is the most common production multi-agent architecture, where a central orchestrator agent manages a pool of specialized worker agents, dynamically assigning subtasks based on their capabilities and the requirements of the current step. Unlike the simpler orchestrator pattern where the boss agent does all the reasoning and merely delegates execution, the orchestrator-worker pattern gives workers genuine autonomy — each worker has its own agent loop, tools, and system prompt, making independent decisions within the scope of its assigned subtask.
The orchestrator-worker pattern is the most common production multi-agent architecture, where a central orchestrator agent manages a pool of specialized worker agents, dynamically assigning subtasks based on their capabilities and the requirements of the current step. Unlike the simpler orchestrator pattern where the boss agent does all the reasoning and merely delegates execution, the orchestrator-worker pattern gives workers genuine autonomy — each worker has its own agent loop, tools, and system prompt, making independent decisions within the scope of its assigned subtask. The orchestrator's primary responsibilities are task decomposition (breaking the goal into subtasks), worker selection (matching subtasks to the right specialist), context routing (providing each worker with only the information it needs), and result synthesis (combining worker outputs into a coherent final result). The key design challenge is the handoff contract: defining how the orchestrator and workers communicate results, errors, and progress without creating tight coupling that defeats the purpose of specialization. This concept connects to multi-agent architectures for the broader pattern family, the orchestrator pattern for the simpler single-orchestrator variant, the A2A protocol for standardizing agent-to-agent handoffs, and single agent patterns for when this complexity isn't warranted.