Anthropic demos running 1,000+ nested Claude agents

Anthropic's CJ Avilla and Harrison Stall demoed orchestrating thousands of nested Claude subagents via dynamic workflows in Claude Managed Agents, avoiding hand-built harnesses and offering a single event stream, token budgets and live steering. A dynamic workflow is a JavaScript script Claude writes and a runtime runs in the background; the flows shipped inside Claude Managed Agents, with a watchlist scanner demo on Opus 5.5.

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