rails-conventions

rails-conventions is a skill for Claude Code, Codex from randomm/pi-ensemble. It costs 49 tokens per session (2,118 once invoked), scanned A, original, Apache-2.0.

A guide for building Ruby on Rails applications using Rails conventions, RSpec tests, and security checks. Rails is a web application framework for Ruby; RSpec is a tool for testing Ruby code.

In plain words
What is it for?
Designing MVC applications and APIs, defining database models and validations, writing tests, reviewing Rails code, and running quality and security checks.
Why use it?
It helps keep Rails applications organized and checks code for failing tests, style problems, dependency vulnerabilities, and common security risks.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Install

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.

agentmods
npx agentmods add skills/randomm/pi-ensemble/rails-conventions
Any agent
npx skills add randomm/pi-ensemble --skill rails-conventions
Clone the repo
git clone --depth 1 https://github.com/randomm/pi-ensemble

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for rails-conventions

README.md
[![agentmods](https://agentmods.dev/badge/skills/randomm/pi-ensemble/rails-conventions.svg)](https://agentmods.dev/skills/randomm/pi-ensemble/rails-conventions)
Your own site
<a href="https://agentmods.dev/skills/randomm/pi-ensemble/rails-conventions"><img src="https://agentmods.dev/badge/skills/randomm/pi-ensemble/rails-conventions.svg" alt="Measured on agentmods" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,118 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00049 $0.02118
Opus 5 $0.00024 $0.01059
Sonnet 5 $0.00010 $0.00424
Haiku 4.5 $0.00005 $0.00212

Measured 6d ago against content hash 9f4c9b712c86, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

rails-conventions 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 6d 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.

skill/rails-conventions/SKILL.md · 298 lines

How it starts

The opening of the file, as written. The whole thing — 298 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Rails Conventions Architect

You are an expert Ruby on Rails architect building scalable, maintainable, and secure Rails applications following industry best practices.

Rails Mantras

  • "Convention over Configuration"
  • "Fat models, skinny controllers"
  • "Don't Repeat Yourself (DRY)"
  • "The Rails Way is usually the right way"
  • "Prefer composition over inheritance"
  • "Test behavior, not implementation"
  • "Database constraints are the last line of defense"
  • "Background jobs for anything > 100ms"
  • "Eager load to prevent N+1"

Core Principles

  • Rails Way: Convention over Configuration
  • RESTful: Resource-based routes and controllers
  • MVC: Proper separation of concerns
  • TDD: RSpec with 85%+ coverage for Rails apps
  • Security First: CSRF, SQL injection, XSS prevention

Quality Gate Checklist

  • bundle exec rspec passes (zero failures)
  • bundle exec rubocop -A passes
  • bundle exec brakeman (security scan)
  • bundle exec bundle-audit (dependency vulnerabilities)
  • Coverage >= 85% (SimpleCov)

Model Layer

# Comprehensive validations
validates :email, presence: true, uniqueness: true, format: { with: URI::MailTo::EMAIL_REGEXP }

# Proper associations
has_many :orders, dependent: :destroy
belongs_to :organization, counter_cache: true

# Scopes for reusable queries
scope :active, -> { where(active: true) }
scope :recent, -> { order(created_at: :desc).limit(10) }

Controller Best Practices

  • Keep controllers thin - delegate to services
  • Use strong parameters for security
  • Implement proper before_action filters
  • Handle exceptions with rescue_from

Testing Standards (RSpec)

# Model specs
RSpec.describe User, type: :model do
  it { should validate_presence_of(:email) }
  it { should have_many(:orders) }
end

# Request specs
RSpec.describe "Users", type: :request do
  describe "GET /users" do
    it "returns success" do
      get users_path
      expect(response).to have_http_status(:success)
    end
  end
end

Read the full file on GitHub · 298 lines

Changes

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.

  1. 6d ago First seen · 298 lines · 49 tokens per session scan A 9f4c9b712c86

Subscribe to this mod's changes

rails-conventions is a skill published in the GitHub repository randomm/pi-ensemble (5 stars, last pushed 4d ago), licensed Apache-2.0. It adds 49 tokens to every session and 2,118 once invoked, about $0.0002 per session on Opus 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 2026-08-31.