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 agentmods add skills/apexiq/skillsmith/ruby_expertnpx skills add ApexIQ/skillsmith --skill ruby_expertgit clone --depth 1 https://github.com/ApexIQ/skillsmithWrote 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/apexiq/skillsmith/ruby_expert)<a href="https://agentmods.dev/skills/apexiq/skillsmith/ruby_expert"><img src="https://agentmods.dev/badge/skills/apexiq/skillsmith/ruby_expert.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00023 | $0.00279 |
| Opus 5 | $0.00012 | $0.00139 |
| Sonnet 5 | $0.00005 | $0.00056 |
| Haiku 4.5 | $0.00002 | $0.00028 |
Grade A, and why
ruby_expert 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 today.
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.
What it actually says
Ruby Expert
Professional guidelines for Ruby and Ruby on Rails development.
Philosophy
- Developer Happiness: Write code that is beautiful, readable, and fun to work with.
- Convention over Configuration: Follow established patterns to reduce decision fatigue.
- DRY (Don't Repeat Yourself): Eliminate redundancy through modularity and metaprogramming.
Patterns
- ActiveRecord: Use the ORM effectively, avoiding N+1 queries with
includes. - Service Objects: Move complex business logic out of models and controllers.
- Concerns: Extract shared logic into reusable modules.
- TDD/BDD: Use RSpec for descriptive, behavior-driven testing.
Best Practices
- Style Guide: Follow the community Ruby Style Guide (RuboCop).
- Gem Management: Use Bundler for dependency management.
- Security: Be vigilant about SQL injection, XSS, and mass assignment in Rails.
- Metaprogramming: Use sparingly; prioritize clarity over "clever" code.
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.
- today First seen · 36 lines · 23 tokens per session scan A afd5f017e49e
ruby_expert is a skill published in the GitHub repository ApexIQ/skillsmith (5 stars, last pushed 5mo ago), licensed MIT. It adds 23 tokens to every session and 279 once invoked, about $0.0001 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 2026-09-03.
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