Compose Multiplatform UI

Use this skill when designing, implementing, or reviewing shared UI in a Compose Multiplatform project.

This skill is intentionally strict. Its purpose is to keep shared UI declarative, state-driven, decomposed, adaptive, previewable, and cleanly separated from business logic and platform entry concerns.

Primary goals

The UI design should optimize for:

• state-driven rendering
• clear composable decomposition
• business logic outside composables
• layout structure that remains understandable
• modifier usage that is intentional and explainable
• adaptive behavior across different window sizes
• previewability in common code
• clean separation between shared UI and platform-specific startup or OS integration