ruby-specialist

A Ruby and Rails coding specialist for Ruby 3.3 and Rails 7 applications. It follows test-first development, where tests are written before or alongside the code they check.

In plain words
What is it for?
Use it for Ruby modules, Rails controllers and models, RSpec tests, API endpoints, and other Ruby-specific implementation work.
Why use it?
It helps produce code that matches current Ruby and Rails conventions and catches mistakes through tests. The description does not specify a separate tool or integration it uses.

Agent

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.

agentmods
npx agentmods add agents/sadjow/home-manager/ruby-specialist
Clone the repo
git clone --depth 1 https://github.com/sadjow/home-manager
Per session 74 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,874 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00074 $0.03874
Opus 5 $0.00037 $0.01937
Sonnet 5 $0.00015 $0.00775
Haiku 4.5 $0.00007 $0.00387

Measured 2d ago against content hash 6b277c2f4bb2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ruby-specialist scanned grade A with 1 finding 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 2d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

const response = await fetch(this.urlValue, {
home/claude/agents/ruby-specialist.md · 631 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2d ago First seen · 631 lines · 74 tokens per session scan A 6b277c2f4bb2

Subscribe to this mod's changes

ruby-specialist is an agent published in the GitHub repository sadjow/home-manager (5 stars, last pushed 3d ago), with no licence file. It adds 74 tokens to every session and 3,874 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other agents, from other repositories

refactoring-agent

Orchestrates incremental refactoring of Rails codebases toward 37signals patterns. WHEN: Refactoring service objects to model methods, converting booleans to state records, migrating from Devise/RSpec/Sidekiq, extracting concerns, or reducing controller complexity. WHEN NOT: Building new features (use…

dilolabs/nosia · 75 tokens

rails-feature-developer

Use this agent when you need to develop new features, implement user stories, or build functionality in a Ruby on Rails application using modern Rails patterns and best practices. This agent excels at TDD-driven development, clean architecture, and Hotwire integration.\n\nExamples:\n- \n Context: User needs to…

dgalarza/claude-code-workflows · 282 tokens

ruby-developer

Implementación de código Ruby on Rails siguiendo specs SDD aprobadas. Usar PROACTIVELY cuando: se implementa una feature en Rails (controllers, models, migrations, services), se refactoriza código existente, o se corrige un bug con spec definida. SIEMPRE requiere una Spec SDD aprobada antes de empezar.

gonzalezpazmonica/pm-workspace · 73 tokens

review-agent

Reviews code for adherence to 37signals Rails conventions. Checks for rich models, CRUD controllers, state records, proper concerns, and Hotwire usage. WHEN: Requesting code review, architecture audit, quality analysis, or pattern compliance checks. WHEN NOT: Implementing features (use implement-agent), refactoring…

dilolabs/nosia · 71 tokens

rails-reviewer

Rails code reviewer and QA. MUST BE USED to verify any Rails change before it is declared done. Checks N+1 queries, mass-assignment safety, fat-controller smells, missing validations, and runs rspec/rails test + rubocop.

toffyui/ccteams · 53 tokens

upgrade

Analyzes Rails applications and generates comprehensive upgrade reports with breaking changes, deprecations, and step-by-step migration guides for Rails 6.0 through 8.1.1. Use when upgrading Rails applications, planning multi-hop upgrades, or querying version-specific changes.

maquina-app/rails-claude-code · 56 tokens