What is Cloudflare Sandboxes (Sandbox SDK)?

Software often has to run code that it did not write and cannot fully trust, such as programs from unknown sources or code produced by an AI, and the worry is that such code could harm the system around it. A common answer is a sandbox, a security mechanism that separates running programs and gives them only a tightly controlled set of resources. Cloudflare Sandboxes (Sandbox SDK) is Cloudflare's service for this: the maker describes a sandbox as an isolated place to run code, which cannot directly read the memory or data of the application that started it. It is meant for uses such as agent-written code, user-uploaded applications, data analysis, development previews and build pipelines.

Written from primary sources and reference pages, and checked against them by an independent AI fact-checker. Drafted with AI assistance.