Why host-agnostic matters

Most boilerplates quietly assume a host. Pick the starter and you have also picked a runtime, a deploy target, and a set of provider SDKs you cannot easily remove.

mod takes the opposite stance. The core speaks only web-standard Request and Response. Anything host-specific — key-value, queues, object storage, durable coordination — lives behind a typed interface with a per-host adapter. Move from one host to another by swapping the adapter, not by rewriting your application.