fusengine/solid-ruby
plugins/solid/skills/solid-ruby/SKILL.md
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.
$ install --global
skillsauthnpx skillsauth add fusengine/agents solid-rubyInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Jul 17, 2026, 2:42 AM49.1s14 files scanned
SKILL.md
- name:
- solid-ruby
- description:
- 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.
- ruby:
- 3.3
- rails:
- 8
- user-invocable:
- true
- references:
- references/solid-principles.md, references/single-responsibility.md, references/open-closed.md, references/liskov-substitution.md, references/interface-segregation.md, references/dependency-inversion.md, references/architecture-patterns.md, references/templates/module.md, references/templates/service.md, references/templates/contract.md, references/templates/model.md, references/templates/error.md, references/templates/test.md
- related-skills:
- solid-detection
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 |
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