android-agp-upgrade
Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.
What this skill does
# AGP 9 Upgrade Workflow
## **Priority: P1**
Step-by-step workflow for upgrading an Android project to AGP 9.
## Prerequisites
- Check current AGP version. If below 8.x, recommend running the AGP Upgrade Assistant in Android Studio first.
- Do NOT use this skill for Kotlin Multiplatform (KMP) projects.
- Verify Gradle, JDK, and Kotlin version compatibility with AGP 9 release notes.
## Step 1: Update dependencies
- If KSP (`com.google.devtools.ksp`) is used, ensure version 2.3.6+.
- If Hilt is used, ensure version 2.59.2+.
- Update AGP to the latest stable 9.x version in the project's build files.
## Step 2: Migrate to built-in Kotlin
AGP 9 includes built-in Kotlin support — the `org.jetbrains.kotlin.android` plugin is no longer needed.
See [migration guide](references/built-in-kotlin.md) for detailed steps.
## Step 3: Migrate to the new AGP DSL
AGP 9 introduces a new DSL for `android {}` blocks. Key changes include namespace handling, build type configuration, and source set declarations.
See [DSL migration](references/dsl-migration.md) for before/after examples.
## Step 4: Migrate kapt to KSP or legacy-kapt
If the project uses `kapt`:
- Prefer migrating to KSP where annotation processors support it (Room, Hilt, Moshi).
- For processors without KSP support, use `legacy-kapt` as a bridge.
## Step 5: Update BuildConfig
If any module uses custom `BuildConfig` fields, update to the new AGP 9 syntax.
## Step 6: Clean up gradle.properties
Remove these flags after migration:
1. `android.builtInKotlin`
2. `android.newDsl`
3. `android.uniquePackageNames`
4. `android.enableAppCompileTimeRClass`
## Guidelines
- Never write or run Python scripts for build migration.
- Never add `android.disallowKotlinSourceSets=false` to `gradle.properties`.
- Do not run `clean` task when verifying — it wastes time.
## Verification
1. `./gradlew help` succeeds.
2. `./gradlew build --dry-run` succeeds.
3. Gradle IDE sync succeeds.
## References
- [Built-in Kotlin Migration](references/built-in-kotlin.md)
- [DSL Migration Guide](references/dsl-migration.md)
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