.tip

With Cache Components on, caching is a property of a subtree, not a page. A cached post body can sit next to a live view counter in the same response, and the build fails if a cached component reads a cookie it should not.

async function Post({ slug }) {
  "use cache";
  cacheTag(`post:${slug}`);
  return <Article post={await getPost(slug)} />;
}

The decision moves to the place that knows what the data depends on, which is the component.