What problem does it solve? Android projects with multiple modules often duplicate the same Gradle configuration (compileSdk, minSdk, Compose setup, toolchains) across every build.gradle.kts file, making updates error-prone and inconsistent. This Skill guides you through centralizing that logic into convention plugins so each module's build file shrinks to a few lines. ## Core Features & Use Cases - Convention Plugin Setup: Step-by-step instructions for creating a build-logic composite build with Application, Library, and Compose convention plugins. - Version Catalog Integration: Shows how to register custom plugin IDs in gradle/libs.versions.toml and share the catalog with build-logic. - AGP 9 Migration Guidance: Explains breaking changes in AGP 9 (built-in Kotlin, removed variant APIs, kapt deprecation) and points to dedicated migration skills. - Use Case: You are adding a new feature module to a multi-module Android app. Instead of copying 40 lines of Gradle config, you apply two convention plugin aliases and declare only the module namespace. ## Quick Start Ask the AI to set up Gradle convention plugins for your multi-module Android project using a build-logic composite build and version catalog.