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.
/plugin marketplace add slbug/claude-ruby-grape-rails/plugin install ruby-grape-railsWrote 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/slbug/claude-ruby-grape-rails/verify)<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.
<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>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 5.1 | $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 |
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.
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
- Never commit with failing tests.
- Never skip security scans on public-facing code.
- Always verify autoloading after structural changes.
- Never ignore Zeitwerk check failures.
Tool Selection Policy
- Read
${REPO_ROOT}/.claude/.runtime_envwhen 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 standardrborbundle exec rubocopbundle exec brakeman
- Use
lefthook run <hook>only when cached runtime detection shows:LEFTHOOK_AVAILABLE=trueLEFTHOOK_CONFIG_PRESENT=trueLEFTHOOK_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=truemeans 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
prontoas 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→ preferbundle exec standardrb- else
RUBOCOP_AVAILABLE=true→ preferbundle exec rubocop BRAKEMAN_AVAILABLE=true→ runbundle exec brakemanPRONTO_AVAILABLE=true→ allow optional finalbundle exec pronto run -c MERGE_BASE_VALUEVERIFY_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 itLEFTHOOK_*booleans control whether Lefthook is an acceptable wrapper, not whether direct checks disappear
Project-Native Composite Runners
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.
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 · 363 lines · 53 tokens per session scan A 3c7747bf0d93
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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