I’m trying to add my own SwiftUI view to the Xcode library in Xcode 16.
However, the view does not appear in the library.

Does anybody have a hint, what could be missing?
Searching for the topic brings up a couple of blog posts with similar code, however, neither works for me. Tried Xcode 16.0, 16.1, 15.4.

• Apple’s WWDC Video on the topic: https://developer.apple.com/videos/play/wwdc2020/10649/
• Documentation: https://developer.apple.com/documentation/developertoolssupport/librarycontentprovider

My test code:

import DeveloperToolsSupport
import SwiftUI

protocol LibraryContentProvider {
    @LibraryContentBuilder
    var views: [LibraryItem] { get }
    
    // Do that later...
    /*
    @LibraryContentBuilder
    func modifiers(base: Custom1View) -> [LibraryItem] {
        []
    }
     */
}

struct CustomView: View {
    let title: String
    let message: String
    var body: some View {
        VStack {
            Text(title)
                .bold()
            Text(message)
        }
        .padding(8)
        .border(.gray, width: 2)
    }
}

struct MyLibraryContent: LibraryContentProvider {
    @LibraryContentBuilder
    var views: [LibraryItem] {
        LibraryItem(
            CustomView(title: "title1", message: "message1"),
            title: "Custom Title"
        )
    }
}