functional-core-imperative-shell

What problem does it solve?

This Skill guides teams to keep pure business logic isolated from side effects, reducing complexity and improving testability by enforcing Functional Core vs Imperative Shell separation.

Core Features & Use Cases

• Clear separation of pure computations (Functional Core) from I/O orchestration (Imperative Shell) to simplify testing.
• Explicit file classification requirements that prevent mixed concerns and encourage consistent project structure.
• Use Case: When starting a new module or refactoring, place business rules in pure functions and wrap I/O in thin shells to minimize drift.

Quick Start

Start by creating a new module that moves calculations into a pure function, then create a minimal shell that handles file I/O and orchestration.