AGP 9 provides built-in Kotlin support. The `org.jetbrains.kotlin.android` plugin is no longer needed, so explicitly applying it causes the plugin application failure after the upgrade. - Remove `org.jetbrains.kotlin.android` from the root and module `plugins` blocks, including its version declaration or alias. - Check Gradle, JDK, and Kotlin compatibility with the AGP 9 release. - If the project uses `kapt`, migrate supported processors to KSP; use `legacy-kapt` only for processors without K...
Scanned 9/5/2026
Install to Claude Code
Skills Directorynpx -y skills add HoangNguyen0403/agent-skills-standard --skill android-agp-upgrade --agent claude-codeInstalls into .claude/skills of the current project.
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# Diagnosis
AGP 9 provides built-in Kotlin support. The `org.jetbrains.kotlin.android` plugin is no longer needed, so explicitly applying it causes the plugin application failure after the upgrade.
# Fix
- Remove `org.jetbrains.kotlin.android` from the root and module `plugins` blocks, including its version declaration or alias.
- Check Gradle, JDK, and Kotlin compatibility with the AGP 9 release.
- If the project uses `kapt`, migrate supported processors to KSP; use `legacy-kapt` only for processors without KSP support.
- Migrate any affected `android {}` configuration to the AGP 9 DSL and update custom `BuildConfig` fields.
- Remove obsolete `gradle.properties` flags: `android.builtInKotlin`, `android.newDsl`, `android.uniquePackageNames`, and `android.enableAppCompileTimeRClass`.
Verify without cleaning:
```sh
./gradlew help
./gradlew build --dry-run
```
Also confirm that IDE sync succeeds.
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