A set of Rails rules for controller actions. Controllers receive web requests, and the rules limit them to the standard actions used by Rails resource routes, such as listing, viewing, creating, updating, and deleting records.

Use it when designing or reviewing Rails controllers and deciding whether an operation belongs in a standard resource action.

It prevents controllers from accumulating custom actions that make routes and request handling harder to understand.

controllers — Cursor rule for Cursor by muraaano

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.

Clone the repo

git clone --depth 1 https://github.com/muraaano/cursor-project-rules-on-rails

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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/muraaano/cursor-project-rules-on-rails/controllers/github.svg)](https://agentmods.dev/rules/muraaano/cursor-project-rules-on-rails/controllers)

Your own site

<a href="https://agentmods.dev/rules/muraaano/cursor-project-rules-on-rails/controllers"><img src="https://agentmods.dev/badge/rules/muraaano/cursor-project-rules-on-rails/controllers/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.

Your own site · 80×15

<a href="https://agentmods.dev/rules/muraaano/cursor-project-rules-on-rails/controllers"><img src="https://agentmods.dev/badge/rules/muraaano/cursor-project-rules-on-rails/controllers.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Nothing until a file matches its globs; then the whole rule loads.

When invoked 162 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00162
Opus 5.5	$0.00000	$0.00065
Sonnet 5.5	$0.00000	$0.00032
Haiku 4.5	$0.00000	$0.00016

Measured 2mo ago against content hash 42c9cd55769a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

controllers 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 2mo 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.

.cursor/rules/controllers.mdc · 32 lines

What it actually says

Controllerの実装規約

アクションの定義

Controllerにはroutes.rbでresourcesおよびresourceによって宣言できるアクション（index, show, create, update, destroy）のみを定義する（DHHルーティング）

良い例

class ThingsController < ApplicationController
  def create
    # 単一作成の処理
  end
end

悪い例

class ThingsController < ApplicationController
  def bulk_create
    # 複数のレコードを一括作成する処理
  end
end

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.

2mo ago First seen · 32 lines · 0 tokens per session scan A 42c9cd55769a

Subscribe to this mod's changes

controllers is a cursor rule published in the GitHub repository muraaano/cursor-project-rules-on-rails (2 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 162 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 2026-08-31.

Backend and APIs

controllers

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

Controllerの実装規約

アクションの定義

良い例

悪い例

What this file has done since we first saw it

Other cursor rules, from other repositories

api-property-optionality-hygiene

python

cursor

django

selectools-providers

ehs-ims-conventions