skill-rails-api

skill-rails-api is a cursor rule for Cursor from dewtech-technologies/dare-method. It costs 0 tokens per session (2,630 once invoked), scanned A, original, MIT.

A set of Ruby on Rails 8 rules for building web APIs, including data access, authentication, authorization, request limits, documentation, and tests.

In plain words
What is it for?
It helps create Rails API controllers, services, database models, serializers, authentication, rate limiting, OpenAPI documentation, and automated tests.
Why use it?
It gives an API project consistent structure and guards against common problems in security, validation, testing, and code organization.

Cursor rule for Cursor

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 rules/dewtech-technologies/dare-method/skill-rails-api
Clone the repo
git clone --depth 1 https://github.com/dewtech-technologies/dare-method

Made for: Cursor.

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 skill-rails-api

README.md
[![agentmods](https://agentmods.dev/badge/rules/dewtech-technologies/dare-method/skill-rails-api.svg)](https://agentmods.dev/rules/dewtech-technologies/dare-method/skill-rails-api)
Your own site
<a href="https://agentmods.dev/rules/dewtech-technologies/dare-method/skill-rails-api"><img src="https://agentmods.dev/badge/rules/dewtech-technologies/dare-method/skill-rails-api.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 2,630 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00000 $0.02630
Opus 5 $0.00000 $0.01315
Sonnet 5 $0.00000 $0.00526
Haiku 4.5 $0.00000 $0.00263

Measured today against content hash 04d766cfd238, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

skill-rails-api 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 today.

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.

implementations/cursor/.cursor/rules/skill-rails-api.mdc · 401 lines

How it starts

The opening of the file, as written. The whole thing — 401 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: Rails 8 API DARE

Você é um desenvolvedor sênior Ruby on Rails 8.x especializado em APIs. Esta skill garante código idiomático Rails, com Layered Design, Solid Queue/Cable, serializers explícitos e auth/autz robustos.

Stack canônica

  • Ruby 3.3+
  • Rails 8.x modo API (rails new --api)
  • PostgreSQL 16
  • Solid Queue — substitui Sidekiq, built-in Rails 8
  • Solid Cable — substitui Redis para Action Cable, built-in Rails 8
  • Devise + devise-jwt ou JWT puro
  • Pundit ou CanCanCan
  • Blueprinter ou Alba para serializers
  • rack-attack para rate limit
  • rswag para OpenAPI/Swagger
  • RSpec + FactoryBot + Faker
  • Rubocop + rubocop-rails-omakase (estilo oficial)
  • bundler-audit

Layered Design em Rails

Camada DARE Pasta Rails
Handler app/controllers/api/v1/
Service app/services/ (ou app/interactors/)
Repository app/repositories/ (opcional em Rails)
Model app/models/
Presenter app/blueprints/ ou app/serializers/

Em Rails 8 API, Repositories são opcionais — ActiveRecord queries dentro de Services bem encapsulados é aceito.


Controllers

module Api
  module V1
    class UsersController < ApplicationController
      before_action :authenticate_user!

      def create
        result = RegisterUser.new(user_params).call
        if result.success?
          render json: UserBlueprint.render(result.user), status: :created
        else
          render json: { error: result.error_code }, status: :conflict
        end
      end

      private

      def user_params
        params.require(:user).permit(:email, :name, :password)
      end
    end
  end
end

Regras:

  • Apenas: autenticar → strong params → chamar Service → renderizar Blueprint
  • NUNCA: query AR no controller, lógica de negócio

Services (Service Object)

class RegisterUser
  Result = Struct.new(:success?, :user, :error_code, keyword_init: true)

  def initialize(params)
    @params = params
  end

  def call
    return Result.new(success?: false, error_code: 'USER_EXISTS') if User.exists?(email: @params[:email])
    user = User.create!(@params)
    Result.new(success?: true, user: user)
  end
end

Read the full file on GitHub · 401 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. today First seen · 401 lines · 2,630 tokens per session scan A 04d766cfd238

Subscribe to this mod's changes

skill-rails-api is a cursor rule published in the GitHub repository dewtech-technologies/dare-method (5 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,630 tokens. 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.