What is rails-dev-plugin?

A development plugin for Ruby on Rails with specialized assistants and reusable guidance for areas such as models, controllers, views, testing, APIs, background jobs, and deployment.

Use it across Rails development tasks including architecture, refactoring, Active Record models, authentication, caching, GraphQL, Hotwire, mailers, DevOps, and API design.

A Rails application often needs different kinds of expertise, and its existing architecture and conventions affect the right solution. This plugin provides focused assistance while adapting recommendations to the project.

rails-dev-plugin — Plugin for Claude Code by ag0os

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.

Clone the repo

git clone --depth 1 https://github.com/ag0os/rails-dev-plugin

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.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/ag0os/rails-dev-plugin/rails-dev-plugin/github.svg)](https://agentmods.dev/plugins/ag0os/rails-dev-plugin/rails-dev-plugin)

Your own site

<a href="https://agentmods.dev/plugins/ag0os/rails-dev-plugin/rails-dev-plugin"><img src="https://agentmods.dev/badge/plugins/ag0os/rails-dev-plugin/rails-dev-plugin/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/plugins/ag0os/rails-dev-plugin/rails-dev-plugin"><img src="https://agentmods.dev/badge/plugins/ag0os/rails-dev-plugin/rails-dev-plugin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 19 skills, 11 agents cost 5,859 tokens a session between them.

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.

Security

Grade A, and why

rails-dev-plugin 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 1mo 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.

.claude-plugin/plugin.json · 33 lines

What it actually says

{
  "name": "rails-dev-plugin",
  "description": "Rails development plugin with specialized agents and portable Skills. Agents are lean orchestrators that load domain-specific Skills for models, controllers, views, services, jobs, testing, architecture, DevOps, GraphQL, Hotwire, API design, mailers, authentication, caching, Ruby refactoring, object-oriented design, and project convention detection. Adapts recommendations to the project's architecture axes (logic placement and delivery) and auto-detected project conventions. Skills are independently usable and exportable to other platforms.",
  "version": "3.0.0",
  "author": {
    "name": "ag0os",
    "url": "https://github.com/ag0os"
  },
  "homepage": "https://github.com/ag0os/rails-dev-plugin",
  "repository": "https://github.com/ag0os/rails-dev-plugin.git",
  "keywords": [
    "rails",
    "ruby",
    "agents",
    "development",
    "testing",
    "architecture",
    "devops",
    "refactoring",
    "graphql",
    "hotwire",
    "stimulus",
    "turbo",
    "activerecord",
    "api",
    "rest",
    "serialization",
    "skills",
    "object-design"
  ],
  "license": "MIT"
}

Contents

What it installs

The manifest is a name and a version. 19 skills, 11 agents travel with it, and installing the plugin installs all of them — 5,859 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Files

What ships with it

1 file beside plugin.json 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.

marketplace.json 385 B

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.

1mo ago First seen · 33 lines scan A 2835421a6056

Subscribe to this mod's changes

rails-dev-plugin is a plugin published in the GitHub repository ag0os/rails-dev-plugin (5 stars, last pushed 4mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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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