Individual skill
configuring-r8-for-compose
Use this skill to configure R8 correctly for a Jetpack Compose application — full mode by default, `proguard-android-optimize.txt`, resource shrinking on, and minimal keep rules because Compose ships consumer ProGuard rules. Covers AGP 8.0+ R8 full mode default, R8's Compose-aware optimizations (lambda grouping, `sourceInformation()` stripping, composable arg constant-folding, `ComposerImpl` devirtualization), legitimate keep needs (`@Serializable`, Hilt entry points, reflective `Saver`s), and the AGP 8.x missing-rule reporter / R8 retrace. Cited gain is roughly 75 percent startup and 60 percent frame-render improvement debug-to-release. Use when setting up a new Compose app, when a PR adds an over-broad keep like `-keep class androidx.compose.** { *; }`, when a release build crashes after enabling minification, when APK size needs reduction, or when first enabling minification.
build/configuring-r8-for-compose/SKILL.md
Source commit 1b32f81724c0d71fe9ef093ca44697f559fdab6e
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
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- Skill scan complete
- No
- Observed behavior
- Instructions only
- Last checked
- Nov 6, 2026
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- 526
- Repository last updated
- Jun 16, 2026
- License
- Apache-2.0
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- agent-skills Repository topic
- android Repository topic
- claude Repository topic
- claude-code Repository topic
- compose Repository topic
- jetpack-compose Repository topic
- kotlin Repository topic
- llm-tools Repository topic
- recomposition Repository topic
- skydoves Repository topic
- engineering Derived category
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# Configuring R8 for Compose — Trust Consumer Rules, Avoid Blanket Keeps
R8 is the only supported shrinker — ProGuard is deprecated. Compose ships consumer ProGuard rules, so most apps need **no** Compose-specific keep rules. The big modern wins come from R8 full mode (default since AGP 8.0): lambda grouping, `sourceInformation()` stripping, constant-folding of composable args, and `ComposerImpl` devirtualization. This skill teaches Claude to set R8 up minimally and refuse over-broad keeps that defeat those wins.
## When to use this skill
- Setting up a new Compose app's release variant for the first time.
- A PR adds `-keep class androidx.compose.** { *; }` or any other Compose-wide keep — push back and apply this skill.
- A release build crashes after enabling minification — the cause is almost always a missing keep on a reflective consumer, not on Compose itself.
- APK size review surfaces a large `classes.dex` and the developer wants to know why.
- The first time `isMinifyEnabled = true` is being flipped on, before any release benchmark is run.
- Cross-link from `../../measurement/testing-compose-in-release-mode/SKILL.md` whenever release measurement is being set up.
## When NOT to use this skill