inbox
when you create a playlist, when a new Hugging Face Hub revision of that playlist is published, or when your playlist is deleted, forum writes a notice for the playlist owner only. those rows live in the header inbox. they are not emailed and they are not sent to other users.
web push
the inbox fills for types that are on. a live browser or OS notification is optional. the first authenticated /app visit with no subscription, or a queued prompt after MCP use, shows a dismissible prompt. clicking Allow in the browser is the only way to subscribe; using MCP does not subscribe you. forum then stores a Web Push subscription (endpoint and keys) so it can send a small payload: event type, title, and click URL. no API tokens or Hub grant fields are included.
you can turn OS notifications off, and mute individual types, in Account → Notifications. OS off is sticky and deletes stored subscriptions. turning a type off skips new inbox rows, toasts, and Web Push for that type; existing inbox rows stay. forum does not add a home-screen PWA manifest in this release; iOS OS notifications stay best-effort, with the inbox as the reliable record.