Anthropic Multiagent Orchestration Public Beta: Up to 20 Subagents per Coordinator, Fan-Out at Runtime, Independent Context Windows

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Anthropic's multiagent orchestration (public beta since May 6) lets a lead agent delegate to up to 20 specialist subagents running in parallel, each in its own context window. You declare the coordinator model, set multiagent.agents with subagent IDs, and the coordinator decides at runtime when to delegate and to whom. Combined with Outcomes (rubric grading) and Dreaming (memory consolidation), this is Anthropic's full stack for self-improving autonomous agent systems.