Our macOS app uses MusicKit to search the Apple Music catalog and browse the customer's library. We are not using ApplicationMusicPlayer for playback. The customer's own Music app is the player, and our app is acting as a browser and remote for it. When the customer picks a catalog search result that is not already in their library, we would like to add it to their library, or to a playlist we create and clearly label as belonging to our app, so that it becomes playable from their library. Is using MusicLibrary to add a catalog item to the user's library a supported use of MusicKit in an app that does not itself play the content? Is creating and writing to a clearly labelled playlist of our own preferable to adding to the top-level library, or is either fine? Is there any supported way to hand a catalog item to the Music app for playback without adding it to the library first? We have tried open location with a music.apple.com URL, which opens the item's page but does not begin playback.

We are building a macOS application that we distribute directly from our website, signed with a Developer ID certificate and notarized. It is not on the Mac App Store and we do not plan to put it there. We want to add MusicKit so a customer can browse and play their own Apple Music library inside our app. We have the MusicKit App Service available to enable on an explicit App ID matching the app's bundle identifier, and we understand that MusicKit is not gated by an entitlement and that no private key is needed on Apple platforms. What we cannot find addressed anywhere is the distribution channel itself. Will MusicAuthorization.request and MusicLibraryRequest work in a Developer ID signed and notarized app distributed outside the Mac App Store, or does MusicKit require Mac App Store distribution?