Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ApexIQ/skillsmith --skill ruby_expertgit clone --depth 1 https://github.com/ApexIQ/skillsmithWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/apexiq/skillsmith/ruby_expert)<a href="https://agentmods.dev/skills/apexiq/skillsmith/ruby_expert"><img src="https://agentmods.dev/badge/skills/apexiq/skillsmith/ruby_expert/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/apexiq/skillsmith/ruby_expert"><img src="https://agentmods.dev/badge/skills/apexiq/skillsmith/ruby_expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00023 | $0.00279 |
| Opus 5.5 | $0.00009 | $0.00112 |
| Sonnet 5.5 | $0.00005 | $0.00056 |
| Haiku 4.5 | $0.00002 | $0.00028 |
Grade A, and why
ruby_expert scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Ruby Expert
Professional guidelines for Ruby and Ruby on Rails development.
Philosophy
- Developer Happiness: Write code that is beautiful, readable, and fun to work with.
- Convention over Configuration: Follow established patterns to reduce decision fatigue.
- DRY (Don't Repeat Yourself): Eliminate redundancy through modularity and metaprogramming.
Patterns
- ActiveRecord: Use the ORM effectively, avoiding N+1 queries with
includes. - Service Objects: Move complex business logic out of models and controllers.
- Concerns: Extract shared logic into reusable modules.
- TDD/BDD: Use RSpec for descriptive, behavior-driven testing.
Best Practices
- Style Guide: Follow the community Ruby Style Guide (RuboCop).
- Gem Management: Use Bundler for dependency management.
- Security: Be vigilant about SQL injection, XSS, and mass assignment in Rails.
- Metaprogramming: Use sparingly; prioritize clarity over "clever" code.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 36 lines · 23 tokens per session scan A afd5f017e49e
ruby_expert is a skill published in the GitHub repository ApexIQ/skillsmith (5 stars, last pushed 6mo ago), licensed MIT. It adds 23 tokens to every session and 279 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
Ruby Patterns
Use this skill when working in Ruby projects (Rails or otherwise) and you want clean object boundaries, predictable dependency management, and maintainable code organization.
django
Use when building, reviewing, securing, testing or shipping a Django app — models, migrations, QuerySets/managers, FBV/CBV views, forms, the admin, settings split, and Django REST Framework (serializers, ModelViewSet, permissions). NOT async FastAPI/Pydantic services (that is fastapi), NOT Postgres schema/index work…
ruby-expert
Expert-level Ruby development with Rails, modern features, testing, and best practices. Use when the user mentions Ruby on Rails, RSpec, gem, Sinatra, or metaprogramming, or when the task involves Ruby 3+ Features, Object-Oriented, Functional Features, or Pattern Matching.
ruby-rails
Use this skill when building Ruby on Rails applications — MVC, ActiveRecord, service objects, API mode, background jobs, and testing. This skill enforces: thin controllers, service objects for business logic, ActiveRecord query best practices, Rails API mode conventions, and RSpec testing patterns. Requires Rails 7+…
rails-load-defaults
Incrementally upgrade Rails config.loaddefaults by walking through each newframeworkdefaults config one at a time. Use this skill whenever the user mentions loaddefaults upgrade, newframeworkdefaults, framework defaults, or wants to bring their Rails app's default configuration up to match their Rails version. Also…
layered-rails
Write, refactor, and review Rails code using layered architecture principles from "Layered Design for Ruby on Rails Applications". Use when writing or refactoring Rails code — models, controllers, services, jobs, mailers, policies, forms, query objects, presenters, view components, state machines, serializers, or…