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 skills add ThibautBaissac/rails_ai_agents --skill rails-architecturegit clone --depth 1 https://github.com/ThibautBaissac/rails_ai_agentsWrote 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/thibautbaissac/rails_ai_agents/rails-architecture)<a href="https://agentmods.dev/skills/thibautbaissac/rails_ai_agents/rails-architecture"><img src="https://agentmods.dev/badge/skills/thibautbaissac/rails_ai_agents/rails-architecture/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.
<a href="https://agentmods.dev/skills/thibautbaissac/rails_ai_agents/rails-architecture"><img src="https://agentmods.dev/badge/skills/thibautbaissac/rails_ai_agents/rails-architecture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 11 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
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 | $0.00088 | $0.01321 |
| Opus 5 | $0.00044 | $0.00660 |
| Sonnet 5 | $0.00018 | $0.00264 |
| Haiku 4.5 | $0.00009 | $0.00132 |
Grade A, and why
rails-architecture 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 12d 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 — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Modern Rails 8 Architecture Patterns
Architecture Decision Tree
Where should this code go?
|
+- View/display formatting? -> Presenter (@presenter-agent)
+- Complex business logic? -> Service Object (@service-agent)
+- Complex database query? -> Query Object (@query-agent)
+- Shared behavior across models? -> Concern (/rails-concern skill)
+- Authorization logic? -> Policy (@policy-agent)
+- Reusable UI with logic? -> ViewComponent (@viewcomponent-agent)
+- Async/background work? -> Job (@job-agent, /solid-queue-setup skill)
+- Complex form (multi-model)? -> Form Object (@form-agent)
+- Transactional email? -> Mailer (@mailer-agent)
+- Real-time/WebSocket? -> Channel (/action-cable-patterns skill)
+- Data validation only? -> Model (@model-agent)
+- HTTP request/response only? -> Controller (@controller-agent)
Layer Responsibilities
| Layer | Responsibility | Should NOT contain |
|---|---|---|
| Controller | HTTP, params, response | Business logic, queries |
| Model | Data, validations, relations | Display logic, HTTP |
| Service | Business logic, orchestration | HTTP, display logic |
| Query | Complex database queries | Business logic |
| Presenter | View formatting, badges | Business logic, queries |
| Policy | Authorization rules | Business logic |
| Component | Reusable UI encapsulation | Business logic |
| Job | Async processing | HTTP, display logic |
| Form | Complex form handling | Persistence logic |
| Mailer | Email composition | Business logic |
| Channel | WebSocket communication | Business logic |
When NOT to Abstract
| Situation | Keep It Simple | Don't Create |
|---|---|---|
| Simple CRUD (< 10 lines) | Keep in controller | Service object |
| Used only once | Inline the code | Abstraction |
| Simple query with 1-2 conditions | Model scope | Query object |
| Basic text formatting | Helper method | Presenter |
| Single model form | form_with model: |
Form object |
| Simple partial without logic | Partial | ViewComponent |
What ships with it
5 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.
- 12d ago First seen · 158 lines · 88 tokens per session scan A 8d70cb01010d
rails-architecture is a skill published in the GitHub repository ThibautBaissac/rails_ai_agents (661 stars, last pushed 3mo ago), licensed MIT. It adds 88 tokens to every session and 1,321 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 2026-08-30.
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