Hello Android Studio! Please meet Claude Code 4.5.

This is the kind of planning I like (Claude Code 4.5 CLI mode). Works great for somebody who "cut their teeth" on the csh (C-shell) and vi (before "vim"). I just handed Claude Code CLI via drag-and-drop a screenshot of the steps that Studio gave me - and it read the screenshot, lol. And then did the plan. Here goes:

❯ please make a plan to upgrade the android gradle plugin to 9.0.0. The image shows what is needed according to Android Studio.

⎿  [Image #1]

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CLAUDE CODE 4.5: follows

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● Explore(Explore Gradle config files)

⎿  Done (16 tool uses · 26.8k tokens · 37s)

● Now let me write the plan.

● Updated plan

⎿  /plan to preview

● The plan upgrades AGP from 8.13.2 to 9.0.0 by:

1. Bumping the version in gradle/libs.versions.toml

2. Adding compatibility flags in gradle.properties — one for each item in the Android Studio upgrade assistant screenshot

The flags preserve current behavior where AGP 9 changes defaults (resValues, R8 strict mode, built-in Kotlin support,

etc.). The existing buildconfig=true and nonTransitiveRClass=false flags already cover two of the items.

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Ready to code?

Here is Claude's plan:

Plan: Upgrade Android Gradle Plugin to 9.0.0

Overview

Upgrade AGP from 8.13.2 to 9.0.0, applying all compatibility flags from the Android Studio upgrade assistant.

Changes

1. gradle/libs.versions.toml — bump AGP version

- Change agp = "8.13.2" to agp = "9.0.0"

2. gradle.properties — add AGP 9 compatibility flags

Add the following properties to opt into backward-compatible behavior where AGP 9 changes defaults:

# AGP 9.0 migration flags

android.defaults.buildfeatures.resvalues=true

android.defaults.buildfeatures.buildconfig=true # (already present)

android.experimental.disableCompileTimeRClass=false

android.suppressUnsupportedCompileSdk=36

Remove or update:

- android.nonTransitiveRClass=false — already present, keep as-is (allows non-unique package names / preserves old R

class behavior)

- android.nonFinalResIds=false — already present, keep as-is

Add these new flags:

# Enable resValues build feature (default changes in AGP 9)

android.defaults.buildfeatures.resvalues=true

# Disable targetSdk defaulting to compileSdk

android.defaults.buildfeatures.buildconfig=true

# Continue to allow <uses-sdk> in the main manifest

android.disableManifestSdkCheck=true

# Allow non-unique package names

android.uniquePackageNames=false

# Enable Dependency Constraints

android.enableDependencyConstraints=true

# Disable R8 Strict Mode for Keep Rules

android.r8.strictKeepRules=false

# Disable R8 Optimized Resource Shrinking

android.r8.optimizedResourceShrinking=false

# Disable built-in Kotlin support

android.useBuiltInKotlinSupport=false

# Preserve the old (internal) AGP DSL APIs

android.preserveOldDslApis=true

# Disable targetSdk defaults to compileSdk

android.targetSdkDefaultsToCompileSdk=false

3. Verify existing gradle.properties flags

These already exist and are compatible:

- android.defaults.buildfeatures.buildconfig=true (Remove android.defaults.buildfeatures.buildconfig if set to false —

it's already true, so no change needed)

- android.nonTransitiveRClass=false (covers non-unique package names partially)

- android.nonFinalResIds=false

Files to modify

1. gradle/libs.versions.toml — AGP version bump

2. gradle.properties — add compatibility flags

Verification

1. Run ./gradlew.bat clean build to confirm all modules compile

2. Run ./gradlew.bat test to confirm tests pass

3. Run ./gradlew.bat :motmbrowser:assembleRelease to verify R8/release builds work

4. Run ./gradlew.bat lint to check for new lint issues