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 agentmods add skills/igmarin/rails-agent-skills/implement-authorizationnpx skills add igmarin/rails-agent-skills --skill implement-authorizationgit clone --depth 1 https://github.com/igmarin/rails-agent-skillsWrote 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/igmarin/rails-agent-skills/implement-authorization)<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="Measured on agentmods" 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 | $0.00043 | $0.01095 |
| Opus 5 | $0.00022 | $0.00548 |
| Sonnet 5 | $0.00009 | $0.00219 |
| Haiku 4.5 | $0.00004 | $0.00110 |
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 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.
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. How it starts
The opening of the file, as written. The whole thing — 121 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
- Add gem — add
punditorcancancanto Gemfile and runbundle install - Generate base — run the gem's installer (
rails g pundit:installorrails g cancan:ability) - 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) orauthorize! :action, @record(CanCanCan) in each action - Verify authorization — attempt an unauthorized action in the browser or console and confirm it raises
Pundit::NotAuthorizedErrororCanCan::AccessDeniedas expected; use persisted records (e.g.,User.create!) not unsaved ones - Scope queries — use
policy_scope(Model)oraccessible_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 |
What ships with it
2 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.
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.
- 6d ago First seen · 121 lines · 43 tokens per session scan A 7349890dfbc9
implement-authorization is a skill published in the GitHub repository igmarin/rails-agent-skills (24 stars, last pushed 15d ago), licensed MIT. It adds 43 tokens to every session and 1,095 once invoked, about $0.0002 per session on Opus 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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