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/ag0os/rails-dev-plugin/rails-architecture-patternsnpx skills add ag0os/rails-dev-plugin --skill rails-architecture-patternsgit clone --depth 1 https://github.com/ag0os/rails-dev-pluginWrote 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/ag0os/rails-dev-plugin/rails-architecture-patterns)<a href="https://agentmods.dev/skills/ag0os/rails-dev-plugin/rails-architecture-patterns"><img src="https://agentmods.dev/badge/skills/ag0os/rails-dev-plugin/rails-architecture-patterns.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 | $0.00077 | $0.01297 |
| Opus 5 | $0.00039 | $0.00648 |
| Sonnet 5 | $0.00015 | $0.00259 |
| Haiku 4.5 | $0.00008 | $0.00130 |
Grade A, and why
rails-architecture-patterns 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 5d 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.
How it starts
The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Rails Architecture Patterns
Architectural planning frameworks and decision guidance. Coordinate across domain skills and agents.
See patterns.md for detailed decision frameworks. Logic-placement and structural-smell fixes fork on Axis A — see decisions.native.md / decisions.extracted.md.
Resolve the Stack Axes First
Before recommending patterns, resolve the project's architecture axes via rails-stack-profiles (once per session):
- Axis A — logic placement (
native/extracted): drives where business logic lives and how structural smells are fixed. See decisions.native.md / decisions.extracted.md. - Axis B — delivery (
html/api): drives view vs serializer choices and which domain skills apply.
Orthogonal facts — test framework, job backend, cache store, auth library — come from the project-conventions fingerprint, not from an architecture axis. Never infer them here.
Available Domain Skills and Agents
| Domain | Skill | Agent | Covers |
|---|---|---|---|
| Models | rails-model-patterns | rails-model | ActiveRecord, associations, migrations, scopes |
| Controllers | rails-controller-patterns | rails-controller | RESTful actions, params, routes, error handling |
| API | rails-api-patterns | rails-api | API controllers, serialization, versioning, JWT |
| Services | rails-service-patterns | rails-service | Service objects, result pattern, DI, external APIs |
| Jobs | rails-jobs-patterns | rails-jobs | ActiveJob, Sidekiq, idempotency, batch processing |
| GraphQL | rails-graphql-patterns | rails-graphql | Schema, mutations, DataLoader, subscriptions |
| Hotwire | hotwire-patterns | rails-hotwire | Stimulus controllers, Turbo frames/streams |
| Views | rails-views-patterns | rails-views | ERB, partials, helpers, caching, accessibility |
| Testing | rails-testing-patterns | rails-test | RSpec, Minitest, system/integration tests |
| DevOps | rails-devops-patterns | rails-devops | Docker, CI/CD, monitoring, security |
| Mailers | rails-mailer-patterns | (skill only) | Action Mailer, previews, delivery, interceptors |
| Auth | rails-auth-patterns | (skill only) | has_secure_password, Devise, sessions, password reset |
| Caching | rails-caching-patterns | (skill only) | Fragment, low-level, HTTP caching, invalidation |
| Refactoring | ruby-refactoring | (skill only) | Code smells, refactoring patterns |
| Object Design | ruby-object-design | (skill only) | Class vs module, Struct, Data, design decisions |
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.
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.
- 5d ago First seen · 112 lines · 77 tokens per session scan A 5f0993fb27ed
rails-architecture-patterns is a skill published in the GitHub repository ag0os/rails-dev-plugin (5 stars, last pushed 3mo ago), licensed MIT. It adds 77 tokens to every session and 1,297 once invoked, about $0.0004 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.
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