How do I install the Solid Ruby skill?

Run npx skillmds@latest add fusengine/solid-ruby-3 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Solid Ruby free to use?

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Who published Solid Ruby?

fusengine (@fusengine) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Solid Ruby by fusengine — Agent Skill

Name: Solid Ruby
Rating: 4.5 (4 reviews)
Author: fusengine

File contents

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

---name: solid-ruby-3description: SOLID principles for Ruby 3.3+ and Rails 8. Files < 100 lines, contracts separated, modular architecture. Modules MANDATORY.---# SOLID Ruby - Modular Architecture## Agent Workflow (MANDATORY)Before ANY implementation, use `TeamCreate` to spawn 3 agents:1. **fuse-ai-pilot:explore-codebase** - Analyze existing architecture2. **fuse-ai-pilot:research-expert** - Verify Ruby/Rails docs via Context73. **fuse-ai-pilot:sniper** - Post-implementation validation---## DRY - Reuse Before Creating (MANDATORY)**Before writing ANY new code:**1. **Grep the codebase** for similar modules, services, or logic2. Check shared locations: `app/modules/core/services/`, `app/modules/core/contracts/`3. If similar code exists -> extend/reuse instead of duplicate4. 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](references/solid-principles.md) | Quick reference || **SRP** | [single-responsibility.md](references/single-responsibility.md) | Fat classes || **OCP** | [open-closed.md](references/open-closed.md) | Adding strategies || **LSP** | [liskov-substitution.md](references/liskov-substitution.md) | Contracts || **ISP** | [interface-segregation.md](references/interface-segregation.md) | Fat modules || **DIP** | [dependency-inversion.md](references/dependency-inversion.md) | Injection || **Architecture** | [architecture-patterns.md](references/architecture-patterns.md) | Modular Rails |### Templates| Template | When to use ||----------|-------------|| [module.md](references/templates/module.md) | Feature module structure || [service.md](references/templates/service.md) | Business logic service || [contract.md](references/templates/contract.md) | Duck typing contracts || [model.md](references/templates/model.md) | Active Record model || [error.md](references/templates/error.md) | Custom exceptions || [test.md](references/templates/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 |

Frequently asked questions

Solid Ruby