Solid ruby

Skill fusengine/agents/plugins/solid/skills/solid-ruby

SOLID principles for Ruby 3.3+ and Rails 8. Files < 100 lines, contracts separated, modular architecture. Modules MANDATORY. Use when: writing or refactoring Ruby/Rails code, structuring app/modules/[feature]/ layers, or defining contracts/ modules.From its SKILL.md

Install

npx -y skills add fusengine/agents --skill solid-ruby

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One thing to look at

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SKILL.md

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SOLID Ruby - Modular Architecture

Agent Workflow (MANDATORY)

Before ANY implementation, use TeamCreate to spawn 3 agents:

fuse-ai-pilot:explore-codebase - Analyze existing architecture
fuse-ai-pilot:research-expert - Verify Ruby/Rails docs via Context7
fuse-ai-pilot:sniper - Post-implementation validation

DRY - Reuse Before Creating (MANDATORY)

Before writing ANY new code:

Grep the codebase for similar modules, services, or logic
Check shared locations: app/modules/core/services/, app/modules/core/contracts/
If similar code exists -> extend/reuse instead of duplicate
If code will be used by 2+ features -> create it in app/modules/core/

Architecture (Modules MANDATORY)

Layer	Location	Max Lines
Controllers	`app/modules/[feature]/controllers/`	50
Services	`app/modules/[feature]/services/`	100
Repositories	`app/modules/[feature]/repositories/`	100
Contracts	`app/modules/[feature]/contracts/`	30
Models	`app/modules/[feature]/models/`	50
Shared	`app/modules/core/{services,contracts,concerns}/`	-

NEVER use flat app/ structure - always app/modules/[feature]/

Critical Rules (MANDATORY)

Rule	Value
File limit	100 lines (split at 90)
Controllers	< 50 lines, delegate to services
Contracts	`contracts/` directory ONLY (duck typing modules)
YARD doc	Every public method documented
Frozen string	`# frozen_string_literal: true` in every file
Concerns	Use for shared behavior (like interfaces)

Reference Guide

Concepts

Topic	Reference	When to consult
SOLID Overview	solid-principles.md	Quick reference
SRP	single-responsibility.md	Fat classes
OCP	open-closed.md	Adding strategies
LSP	liskov-substitution.md	Contracts
ISP	interface-segregation.md	Fat modules
DIP	dependency-inversion.md	Injection
Architecture	architecture-patterns.md	Modular Rails

Templates

Template	When to use
module.md	Feature module structure
service.md	Business logic service
contract.md	Duck typing contracts
model.md	Active Record model
error.md	Custom exceptions
test.md	RSpec tests

Forbidden

Anti-Pattern	Fix
Files > 100 lines	Split at 90
Business logic in models	Extract to service
Fat controllers	Delegate to services
Flat `app/` structure	Use `app/modules/[feature]/`
God classes	Split by responsibility

What ships with it: 13 files

34.0 KB alongside SKILL.md