What is implement-authorization?

A set of rules for controlling which users may perform actions on records in a Ruby on Rails application. It uses Pundit, CanCanCan, or policy objects to keep permission rules separate from controllers.

Use it when adding or reviewing roles, permissions, and access rules in Rails. It covers protecting controller actions, filtering record lists, and testing allowed and forbidden actions.

It helps prevent unauthorized actions and inconsistent permission checks. It also makes permissions easier to test for different roles, such as admins, owners, and guests.

implement-authorization — Skill for Claude Code and Codex by igmarin

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.

Any agent

npx skills add igmarin/rails-agent-skills --skill implement-authorization

Clone the repo

git clone --depth 1 https://github.com/igmarin/rails-agent-skills

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/igmarin/rails-agent-skills/implement-authorization/github.svg)](https://agentmods.dev/skills/igmarin/rails-agent-skills/implement-authorization)

Your own site

<a href="https://agentmods.dev/skills/igmarin/rails-agent-skills/implement-authorization"><img src="https://agentmods.dev/badge/skills/igmarin/rails-agent-skills/implement-authorization/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/skills/igmarin/rails-agent-skills/implement-authorization"><img src="https://agentmods.dev/badge/skills/igmarin/rails-agent-skills/implement-authorization.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,141 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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	$0.00043	$0.01141
Opus 5.5	$0.00017	$0.00456
Sonnet 5.5	$0.00009	$0.00228
Haiku 4.5	$0.00004	$0.00114

Measured 25d ago against content hash 4f4884bb87f3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

implement-authorization scanned grade A with 1 finding 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 25d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

2. **HTTP and Policy Verification** — concrete `curl` requests or controller test commands with expected HTTP response codes (e.g. `403 Forbidden` or `302 Found`) when access is denied.

skills/implement-authorization/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Implement Authorization

Quick Reference

Gem	Pattern	Best For
Pundit	Explicit policy classes	Complex per-resource rules
CanCanCan	Centralized Ability class	Simple role-based permissions

Core Process

Implementation Workflow

Inspect existing authorization — reuse the installed policy framework; add pundit or cancancan only if the task requires a new framework and project conventions permit it
Generate base only when needed — run the gem's installer (rails g pundit:install or rails g cancan:ability) only when no supported framework is present and the project permits the generator; otherwise proceed with the detected framework without invoking generators
Define policies/abilities — create policy classes (Pundit) or populate the Ability class (CanCanCan); always use policy objects, never inline authorization logic in controllers
Authorize in controllers — call authorize @record (Pundit) or authorize! :action, @record (CanCanCan) in each action
Verify authorization — attempt an unauthorized action in the browser or console and confirm it raises Pundit::NotAuthorizedError or CanCan::AccessDenied as expected; use persisted records (e.g., User.create!) not unsaved ones
Scope queries — use policy_scope(Model) or accessible_by(current_ability) for index actions
Test all roles — write policy specs and request specs covering admin, owner, and guest; check specific permissions, never presence checks alone

Patterns

Pundit

class PostPolicy < ApplicationPolicy
  def update?
    user.admin? || record.user_id == user.id
  end
end

CanCanCan

class Ability
  include CanCan::Ability

  def initialize(user)
    can :update, Post, user_id: user.id
    can :manage, :all if user.admin?
  end
end

Troubleshooting

Error	Likely Cause	Fix
`Pundit::NotDefinedError`	No policy class found for the record	Create `app/policies/model_policy.rb` inheriting from `ApplicationPolicy`
`Pundit::AuthorizationNotPerformedError`	`authorize` not called in a controller action	Add `authorize @record` in the action, or `after_action :verify_authorized` to catch misses
`CanCan::AccessDenied` unexpectedly raised	Ability rules not matching the current user/role	Inspect `current_ability.can?(:action, @record)` in the console to debug rule evaluation

Read the full file on GitHub · 122 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

25d ago Changed · -1 lines 4f4884bb87f3
1mo ago Changed · +2 lines e5e42f6c31cd
1mo ago First seen · 121 lines · 43 tokens per session scan A 7349890dfbc9

Subscribe to this mod's changes

implement-authorization is a skill published in the GitHub repository igmarin/rails-agent-skills (28 stars, last pushed 26d ago), licensed MIT. It adds 43 tokens to every session and 1,141 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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