Build business logic that's powerful, predictable, and maintainable.

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CMDx is a Ruby framework for building maintainable business logic through composable command objects using the CERO (Compose, Execute, React, Observe) pattern. It provides typed attributes, validation, callbacks, and structured logging for task execution. The framework facilitates Domain Driven Design by making business processes explicit through named tasks, enforcing bounded contexts via namespaces, and separating behavior from state. CMDx offers log-based event sourcing as a pragmatic alternative to traditional event sourcing, using structured logs as an immutable ledger without requiring specialized infrastructure. It includes built-in RBS type annotations for static analysis and improved IDE support.

Getting Started