Version-sensitive. Every API name, SDK gate and browser-support claim below was verified on 2026-09-08 against primary sources. What against, and when, is in _jutsu/VERSIONS.md. If that date is old, re-verify before acting on a version number.

Compose Motion - Sub-skill

Jetpack Compose animation core. Loaded for Android Compose and Compose Multiplatform projects. Concise rules here. Deep-dive in references/. Baseline: Jetpack Compose 1.12.0 (current stable, Aug 2026) - i.e. Compose BOM 2026.08.x. Modern stable APIs only - no swipeable, no animateContentSize hacks where AnimatedContent is correct. Anything below flagged 'Compose 1.x+' is a since marker, not the target.

API Decision Tree