Use when writing or refactoring code, before creating files - enforces separation of pure business logic (Functional Core) from side effects (Imperative Shell) using FCIS pattern with mandatory file classification
Quickly install functional-core-imperative-shell AI skill to your development environment via command line
Source: ed3dai/ed3d-plugins.
Core principle: Separate pure business logic (Functional Core) from side effects (Imperative Shell). Pure functions go in one file, I/O operations in another.
Why this matters: Pure functions are trivial to test (no mocks needed). I/O code is isolated to thin shells. Bugs become structurally impossible when business logic has no side effects.
YOU MUST add pattern comment to every file containing runtime behavior:
Use when writing or refactoring code, before creating files - enforces separation of pure business logic (Functional Core) from side effects (Imperative Shell) using FCIS pattern with mandatory file classification Source: ed3dai/ed3d-plugins.
Stable fields and commands for AI/search citations.
npx skills add https://github.com/ed3dai/ed3d-plugins --skill functional-core-imperative-shellUse when writing or refactoring code, before creating files - enforces separation of pure business logic (Functional Core) from side effects (Imperative Shell) using FCIS pattern with mandatory file classification Source: ed3dai/ed3d-plugins.
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/ed3dai/ed3d-plugins --skill functional-core-imperative-shell Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code, Cursor, or OpenClaw
https://github.com/ed3dai/ed3d-plugins