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/research)<a href="https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/research"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/research/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/research"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/research.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 | $0.00044 | $0.02997 |
| Opus 5.5 | $0.00018 | $0.01199 |
| Sonnet 5.5 | $0.00009 | $0.00599 |
| Haiku 4.5 | $0.00004 | $0.00300 |
Grade A, and why
rb:research 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 — 386 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Research Ruby Approaches
Research with primary sources first, synthesize findings, and provide actionable recommendations.
Iron Laws
- Start with T1 primary sources before using community commentary.
- Mark source tiers explicitly in every research artifact.
- Do not make version-specific claims without a cited source.
- Separate reusable cross-plan research from plan-local repo findings.
- Use
output-verifierbefore high-impact recommendations that depend on external evidence.
Research Process
Repository Topology Check
Before deep research in an existing codebase, identify:
- which package/app owns the code in question
- which ORM that package uses
- whether Packwerk or a similar modular-monolith structure is present
If the repo appears modular but explicit Packwerk signals are absent, ask:
No Packwerk detected. Do you have something similar implemented? Where are the modules/packages and what stack/ORM does each use?
START ──▶ DECOMPOSE_QUERY ──▶ SPAWN_RESEARCHERS ──▶ PARALLEL_RESEARCH
│
▼
┌─────────────────┐
│ WAIT FOR ALL │
└────────┬────────┘
│
▼
┌─────────────────┐
│ SYNTHESIZE │
│ FINDINGS │
└────────┬────────┘
│
▼
┌─────────────────┐
│ STRUCTURE │
│ OUTPUT │
└────────┬────────┘
│
▼
OUTPUT
What ships with it
1 file 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 · 386 lines · 44 tokens per session scan A 0cf4e2525446
rb:research is a skill published in the GitHub repository slbug/claude-ruby-grape-rails (7 stars, last pushed 16d ago), licensed MIT. It adds 44 tokens to every session and 2,997 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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