rb:verify

rb:verify is a skill for Claude Code from slbug/claude-ruby-grape-rails. It costs 53 tokens per session (3,142 once invoked), scanned A, original, MIT.

A verification checklist for Ruby, Rails, and Grape projects that runs available checks such as code style, security scans, autoloading checks, and tests.

In plain words
What is it for?
Use it to verify changes in a Ruby project or run a project’s continuous-integration checks in a defined order.
Why use it?
It catches broken loading, style problems, security issues, and failing tests before work is treated as complete.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the ruby-grape-rails plugin — 52 skills, 19 agents, 17 hooks shipped together

Good fit Use it to verify changes in a Ruby project or run a project’s continuous-integration checks in a defined order.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add slbug/claude-ruby-grape-rails
Claude Code
/plugin install ruby-grape-rails

Made for: Claude Code.

Or install ruby-grape-rails, the plugin that ships this one along with the rest of its 52 skills, 19 agents, 17 hooks.

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 rb:verify

README.md
[![agentmods](https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/verify/github.svg)](https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/verify)
Your own site
<a href="https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/verify"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/verify/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 rb:verify

Your own site · 80×15
<a href="https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/verify"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/verify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,142 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 $0.00053 $0.03142
Opus 5.5 $0.00021 $0.01257
Sonnet 5.5 $0.00011 $0.00628
Haiku 4.5 $0.00005 $0.00314

Measured 1mo ago against content hash 3c7747bf0d93, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rb:verify 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.

plugins/ruby-grape-rails/skills/verify/SKILL.md · 363 lines

How it starts

The opening of the file, as written. The whole thing — 363 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Verify Ruby Work

Run verification in priority order, stopping at the first failure. Each step must pass before proceeding to the next.

Iron Laws

  1. Never commit with failing tests.
  2. Never skip security scans on public-facing code.
  3. Always verify autoloading after structural changes.
  4. Never ignore Zeitwerk check failures.

Tool Selection Policy

  • Read ${REPO_ROOT}/.claude/.runtime_env when present and non-symlinked; use its tool booleans as the primary command-selection source of truth.
  • Prefer direct tools as the source of truth:
    • bundle exec standardrb or bundle exec rubocop
    • bundle exec brakeman
  • Use lefthook run <hook> only when cached runtime detection shows:
    • LEFTHOOK_AVAILABLE=true
    • LEFTHOOK_CONFIG_PRESENT=true
    • LEFTHOOK_LINT_SECURITY_COVERED=true
  • If Lefthook is available but no config is detected, ask the user where the config lives before treating it as authoritative.
  • LEFTHOOK_DIFF_LINT_COVERED=true means Lefthook covers diff-scoped Pronto/RuboCop review only; it does not replace full direct linting.
  • Tests are separate from Lefthook policy and should stay targeted/full based on change scope.
  • Treat pronto as an optional final diff-scoped pass:
    • run it after direct lint/security checks
    • do not use it as a substitute for StandardRB/RuboCop or Brakeman

When cached runtime state is available:

  • STANDARDRB_AVAILABLE=true → prefer bundle exec standardrb
  • else RUBOCOP_AVAILABLE=true → prefer bundle exec rubocop
  • BRAKEMAN_AVAILABLE=true → run bundle exec brakeman
  • PRONTO_AVAILABLE=true → allow optional final bundle exec pronto run -c MERGE_BASE_VALUE
  • VERIFY_COMPOSITE_AVAILABLE=true → treat that as a hint that a repo-native composite verifier may exist, then re-detect it from the working tree before running it
  • LEFTHOOK_* booleans control whether Lefthook is an acceptable wrapper, not whether direct checks disappear

Project-Native Composite Runners

Read the full file on GitHub · 363 lines

Files

What ships with it

2 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. 1mo ago First seen · 363 lines · 53 tokens per session scan A 3c7747bf0d93

Subscribe to this mod's changes

rb:verify is a skill published in the GitHub repository slbug/claude-ruby-grape-rails (7 stars, last pushed 16d ago), licensed MIT. It adds 53 tokens to every session and 3,142 once invoked, about $0.0002 per session on Opus 5.5. 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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