Ruby Expert

This is your go-to for modern Ruby and Rails development, covering everything from Ruby 3+ features like pattern matching and endless methods to full-stack Rails 7 applications with Active Record, background jobs, and API controllers. The examples are comprehensive and production-ready, showing real patterns for associations, validations, query optimization, and error handling. What I like here is the focus on modern syntax like numbered block parameters and hash literal value omission that many Ruby developers still aren't using. If you're building Rails APIs or need solid examples of proper model callbacks and scope chains, this has you covered without the usual tutorial fluff.

skills.sh installs: 191
GitHub stars: 44
last updated: Aug 21, 2026

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Install

$ npx -y skills add personamanagmentlayer/pcl --skill ruby-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

Ruby Expert

Expert guidance for Ruby development, including Ruby 3+ features, Rails framework, testing with RSpec, and Ruby best practices.

Core Concepts

Ruby 3+ Features

Pattern matching
Ractors (parallel execution)
Fibers (cooperative concurrency)
Type signatures (RBS)
Endless methods
Numbered block parameters
Hash literal value omission

Object-Oriented

Everything is an object
Classes and modules
Inheritance and mixins
Method visibility (public, private, protected)
Singleton methods and eigenclasses
Duck typing

Functional Features

Blocks, procs, and lambdas
Higher-order functions (map, reduce, select)
Enumerables
Lazy evaluation

Modern Ruby Syntax

Pattern Matching (Ruby 3.0+)

# Case/in pattern matching
def process_response(response)
  case response
  in { status: 200, body: }
    puts "Success: #{body}"
  in { status: 404 }
    puts "Not found"
  in { status: 500..599, error: message }
    puts "Server error: #{message}"
  else
    puts "Unknown response"
  end
end

# Rightward assignment
response = { status: 200, body: "OK" }
response => { status:, body: }
puts status  # 200
puts body    # "OK"

SKILL.md on GitHub