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Kotlin + Arrow Resource lifecycle discipline with `Resource`, `ResourceScope`, `resourceScope`, and context parameters. Use for safe acquisition/release of files, streams, DB pools/connections, HTTP clients, background scopes, or multipart parts; preventing resource leaks and use-after-close bugs; designing companion `Resource` builders; using `arrow-autoclose` when only synchronous `AutoCloseable` cleanup is possible; composing resources with typed errors, cancellation, or parallel acquisition.

Models Kotlin logical failures with Arrow's context-parameter Raise DSL and wrappers such as Either, nullable, Option, and Ior. Use when implementing or simplifying typed-error flows, translating error types, replacing verbose Either handling, validating input with accumulation, or selecting an error wrapper.

Simplifies code for clarity without changing behavior. Use when code is working but overly complex, deeply nested, duplicated, or unclear.

Kotlin context parameters (`context(...)`) for scoped dependencies, DSL scopes, and migrations from context receivers. Use when designing, reviewing, or refactoring Kotlin code that uses implicit contextual values.

Compose state management with a strong state-hoisting preference for Kotlin Compose (Android, Multiplatform, Compose for Web). Use for refactors or new UI that needs clear state ownership, unidirectional data flow, saved state decisions, or guidance on remember/retain/rememberSaveable/rememberSerializable, and for designing stateless composables with event callbacks.