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37signals-style

37signals-style is a skill for Claude Code from zarpay/rails-template. It costs 62 tokens per session (742 once invoked), scanned A, original, MIT.

A set of Ruby on Rails coding patterns based on the Fizzy codebase associated with 37signals. Ruby on Rails is a framework for building web applications.

In plain words
What is it for?
Use it when writing or reviewing Rails controllers, models, views, routes, database migrations, Hotwire features, background jobs, and authentication.
Why use it?
It gives Rails developers consistent examples for organising application code, database changes, security, tests, and interactive pages.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

not rated 9repo 1mo ago A scan 62 tokens original MIT

Good fit Use it when writing or reviewing Rails controllers, models, views, routes, database migrations, Hotwire features, background jobs, and authentication.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/zarpay/rails-template/37signals-style
View source ↗ zarpay/rails-template
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 zarpay/rails-template --skill 37signals-style
Clone the repo
git clone --depth 1 https://github.com/zarpay/rails-template

Made for: Claude Code.

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.

agentmods badge for 37signals-style

README.md
[![agentmods](https://agentmods.dev/badge/skills/zarpay/rails-template/37signals-style/github.svg)](https://agentmods.dev/skills/zarpay/rails-template/37signals-style)
Your own site
<a href="https://agentmods.dev/skills/zarpay/rails-template/37signals-style"><img src="https://agentmods.dev/badge/skills/zarpay/rails-template/37signals-style/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.

agentmods 80×15 button for 37signals-style

Your own site · 80×15
<a href="https://agentmods.dev/skills/zarpay/rails-template/37signals-style"><img src="https://agentmods.dev/badge/skills/zarpay/rails-template/37signals-style.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 742 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00062 $0.00742
Opus 5 $0.00031 $0.00371
Sonnet 5 $0.00012 $0.00148
Haiku 4.5 $0.00006 $0.00074

Measured 12d ago against content hash 4d6590b2a379, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

37signals-style 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.

files/.claude/skills/37signals-style/SKILL.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

37signals Style Guide

Patterns derived from analysis of 37signals' Fizzy codebase. Representative, not authoritative — these reflect observed conventions, not an official 37signals document.

Topic Map

Core Rails Patterns

  • references/controllers.md — Thin controllers, concerns, authentication, authorization
  • references/models.md — Fat models, scopes, query objects, concerns
  • references/views.md — Presenters, partials, view helpers, template conventions
  • references/routing.md — RESTful design, nested resources, custom routes
  • references/database.md — Schema design, indexes, migrations, query optimization

Frontend & Hotwire

  • references/hotwire.md — Turbo Drive, Turbo Frames, Turbo Streams patterns
  • references/stimulus.md — Stimulus controller conventions, value API, targets
  • references/css.md — CSS organization, naming conventions, component patterns
  • references/action-text.md — Rich text integration patterns
  • references/actioncable.md — WebSocket channel patterns

Application Features

  • references/authentication.md — Session management, password reset, remember me
  • references/background-jobs.md — Solid Queue/ActiveJob patterns, retry strategies
  • references/caching.md — Fragment caching, counter caches, cache keys
  • references/email.md — Mailer conventions, transactional email patterns
  • references/notifications.md — In-app notifications, notification objects
  • references/filtering.md — Search and filter patterns, query objects
  • references/workflows.md — Multi-step processes, state machines
  • references/webhooks.md — Inbound/outbound webhook handling

Infrastructure

  • references/active-storage.md — File upload conventions, image variants
  • references/configuration.md — Environment config, credentials, feature flags
  • references/observability.md — Logging, error tracking, instrumentation
  • references/performance.md — N+1 prevention, caching strategies, query optimization
  • references/security-checklist.md — OWASP checklist, Brakeman, safe patterns
  • references/multi-tenancy.md — Account scoping, current attributes
  • references/mobile.md — Mobile-specific patterns, PWA considerations
  • references/ai-llm.md — LLM/AI integration patterns

Read the full file on GitHub · 58 lines

Files

What ships with it

35 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.

  1. 12d ago First seen · 58 lines · 62 tokens per session scan A 4d6590b2a379

Subscribe to this mod's changes

37signals-style is a skill published in the GitHub repository zarpay/rails-template (9 stars, last pushed 1mo ago), licensed MIT. It adds 62 tokens to every session and 742 once invoked, about $0.0003 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.

Backend and APIsLanguagesRuby
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