Does anyone know what the Android plugin maven coordinates are? In convention plugins, we're supposed not to use the plugin ID

You could always use the marker plugin id, it is basically a redirect:

"$id:$id.gradle.plugin:$version"

, so for android this is the marker id:

"com.android.application:com.android.application.gradle.plugin:7.4.2"

.

Is the same ID for Application & Library?

Yes

Thanks

Yep, it contains multiple plugins, you can find the list here: https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:[…]ystem/gradle-core/src/main/resources/META-INF/gradle-plugins/ every file declares corresponding plugin id, and contains implementation class