Rearchitecting the Workflows control plane for the agentic era

Cloudflare describes a V2 redesign of its Workflows control plane to support far higher throughput and concurrency (50,000 concurrent instances, 300 instances/sec per account, 2 million queued instances per workflow). The post explains bottlenecks in the V1 Durable Object-based Account design, introduces two new components—SousChef (per-workflow metadata/lifecycle shard) and Gatekeeper (concurrency slot leasing)—and details a seamless migration strategy that converts legacy Account Durable Objects to SousChef behavior to avoid downtime while scaling.