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kotlin-tooling-agp9-migration

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Migrates Kotlin Multiplatform (KMP) projects to Android Gradle Plugin 9.0+. Handles plugin replacement (com.android.kotlin.multiplatform.library), module splitting, DSL migration, and the new default project structure. Use when upgrading AGP, when build fails due to KMP+AGP incompatibility, or when the user mentions AGP 9.0, android multiplatform plugin, KMP migration, or com.android.kotlin.multiplatform.library.

skills/kotlin-tooling-agp9-migration/SKILL.md

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Oct 30, 2026
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Apache-2.0

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# KMP AGP 9.0 Migration

Android Gradle Plugin 9.0 makes the Android application and library plugins incompatible
with the Kotlin Multiplatform plugin in the same module. This skill guides you through the
migration.

## Step 0: Analyze the Project

Before making any changes, understand the project structure:
1. Read `settings.gradle.kts` (or `.gradle`) to find all modules
2. For each module, read its `build.gradle.kts` to identify which plugins are applied
3. Check if the project uses a Gradle version catalog (`gradle/libs.versions.toml`). If it exists,
   read it for current AGP/Gradle/Kotlin versions. If not, find versions directly in `build.gradle.kts`
   files (typically in the root `buildscript {}` or `plugins {}` block). **Adapt all examples in this
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