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The Companions to Come

https://blog.jetbrains.com/kotlin/2026/09/the-companions-to-come

We are working on extensions to our companions mechanism to unlock new code patterns and improve interoperability across different platforms. This post outlines these new features and provides preliminary guidance on migration.

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Built in Kotlin

Deprecated ‘org.jetbrains.kotlin.android’ plugin usage
The ‘org.jetbrains.kotlin.android’ plugin in project ‘:app’ is no longer required for Kotlin support since AGP 9.0.
Solution: Remove both android.builtInKotlin=true and android.newDsl=false from gradle.properties, then migrate to built-in Kotlin.
See https://kotl.in/gradle/agp-built-in-kotlin for more details.

https://developer.android.com/build/migrate-to-built-in-kotlin