rails-deps: Automate Rails Dependency Setup

Where this fits

You’re a Rails developer starting a fresh project or inheriting a legacy codebase. You know you should add strong_migrations to catch unsafe database changes, bullet to spot N+1 queries, letter_opener to preview emails, and herb for HTML/ERB linting—but remembering all of them, installing correctly, and configuring initializers takes time. The rails-deps skill automates this checklist: it inspects your project, tells you which recommended gems are missing, and provides install-and-configure guidance in seconds.

Why agents benefit

• Reads your Gemfile with Read and Grep to identify which gems already exist, avoiding redundant suggestions.
• Scans project structure using Glob to detect configuration files, so it can recommend exact placement for initializers or email previews.
• Executes installation commands via Bash—it can run bundle add or rails generate for you, then verify success.
• Provides contextual guidance per gem, such as enabling bullet only in development or configuring letter_opener’s delivery method.
• Returns actionable output—not just a list, but step‑by‑step instructions tailored to your current setup.

Practical scenarios

Onboarding to an existing Rails app

You clone a team repository that’s been in production for years. Run /rails-deps:check. The agent scans your Gemfile and reports that bullet and strong_migrations are missing. It then suggests installing them and shows you where to add the bullet initializer so you can start detecting N+1 queries immediately.

Scaffolding a new Rails API

You’ve just run rails new myapp --api. Use the skill to set up development dependencies: it installs letter_opener so you can preview emails in the browser (useful even for API apps with ActionMailer), and adds herb for consistent ERB formatting across your views.

Auditing a monolith before a release

Before a big deploy, you want to ensure migration safety. The skill checks for strong_migrations and flags unsafe migration patterns in your existing migrations, reminding you to add a safety_assured call or use add_index with algorithm: :concurrently in production.

Add it to your agent workflow

Install the skill with:

npx skills add iuhoay/skills --skill rails-deps

Then have your agent run a quick health check:

/rails-deps:check

The agent will report which of the four recommended gems (strong_migrations, herb, bullet, letter_opener) are installed and suggest installing the missing ones. You can install a single gem with /rails-deps:install bullet, and it will add the gem to your Gemfile and generate an initializer with recommended defaults.

Compare before adopting

Before adding rails-deps to your toolkit, compare against alternatives. Look at quality signals—check the repo’s stars, last commit date, and open issues. Maintenance freshness matters: a skill that isn’t updated for Rails 7.1 or 7.2 may give stale advice. Consider alternatives like a manual checklist script or other agent skills that cover only one gem (e.g., strong_migrations alone). Finally, evaluate workflow fit: does the skill’s allowed tools (Read, Glob, Grep, Bash) match your security boundaries? If your agent runs in a sandbox without Bash, you’ll need to adapt.

Why it is worth tracking

With 52 stars and a focused scope, rails-deps is a solid example of a domain‑specific agent skill that saves real time. Its value grows as the Rails ecosystem evolves—strong_migrations, bullet, and letter_opener remain standard tools, and the skill’s maintenance history indicates it keeps pace. If you frequently bootstrap Rails apps or audit existing ones, this skill is worth evaluating now; you can see its full documentation and community context at OpenAgentSkill to gauge if it fits your agent’s capabilities.