Cloudflare Dynamic Workers: Agent Sandboxing 100x Faster Than Containers

Cloudflare has launched Dynamic Workers in open beta, a lightweight sandboxing system purpose-built for AI agent execution that starts in milliseconds and uses only a few megabytes of memory.

Released on March 24, Dynamic Workers lets a Worker spin up other Workers at runtime to execute code on-demand in a secure, sandboxed environment. Compared with traditional Linux containers, Dynamic Workers is roughly 100x faster to start and between 10x and 100x more memory efficient.

This matters for agents because AI agent frameworks need to execute untrusted or dynamically generated code safely. Containers are too slow and heavy for per-request sandboxing. Dynamic Workers run on the same machine — even the same thread — as the request that created them, eliminating cold start overhead entirely.

The feature is now available to all paid Workers users. Each Dynamic Worker runs in its own V8 isolate with strict memory limits and no access to the parent Worker's resources, providing strong security isolation without the cost of spinning up a full container.

https://blog.cloudflare.com/dynamic-workers/
https://developers.cloudflare.com/changelog/post/2026-03-24-dynamic-workers-open-beta/