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/work)<a href="https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/work"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/work/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/work"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/work.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 | $0.00046 | $0.02635 |
| Opus 5.5 | $0.00018 | $0.01054 |
| Sonnet 5.5 | $0.00009 | $0.00527 |
| Haiku 4.5 | $0.00005 | $0.00264 |
Grade A, and why
rb:work 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 — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Work
Execute the unchecked tasks from a plan file.
Usage
/rb:work .claude/plans/user-auth/plan.md/rb:work .claude/plans/user-auth/plan.md --from P2-T3/rb:work(resumes the active plan)
Iron Laws
- Never auto-start
/rb:review. - Plan checkboxes are the state - check them off as you complete.
- Read
scratchpad.mdbefore implementing. - Verify after every task with the project's actual toolchain.
- After three failed attempts, create a blocker instead of thrashing.
- Ask when a task is ambiguous rather than guessing.
- Prefer small, verifiable commits over large changes.
- Keep Iron Laws visible - review them before each task batch.
Execution State Machine
START ──▶ READ PLAN ──▶ ANALYZE CONTEXT ──▶ PICK TASK
│ │
▼ ▼
CHECK SCRATCHPAD ◀──────┘
│
▼
┌───────────────────────┐
│ IMPLEMENT TASK │
│ - Read files │
│ - Make changes │
│ - Verify │
└───────────┬───────────┘
│
┌─────────┴─────────┐
▼ ▼
[SUCCESS] [FAILURE]
│ │
▼ ▼
CHECK OFF TASK ◀─── CREATE BLOCKER
│ (after 3 tries)
▼
MORE TASKS?
│
┌─────────┴─────────┐
▼ ▼
[YES] [NO]
│ │
▼ ▼
PICK NEXT TASK UPDATE PLAN
│
▼
SUMMARIZE & OFFER
/rb:review
Startup Sequence
What ships with it
5 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 · 350 lines · 46 tokens per session scan A 9cdae533e3de
rb:work is a skill published in the GitHub repository slbug/claude-ruby-grape-rails (7 stars, last pushed 16d ago), licensed MIT. It adds 46 tokens to every session and 2,635 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.
Other skills, from other repositories
browser-use
Direct browser control via CDP for web interaction: automation, scraping, testing, screenshots, and site/app work.
omh-morning-brief
This is a Hermes-native morning-brief workflow skill.
todos
Use when the user asks for a shared plan, a task needs at least three substantive execution steps, or a loose TODO is pending. Without an explicit plan request, not for one-shot answers or checks, or one- to two-step work that is not already in the list.
ask-agents
Send a task or question to Claude Code and/or Gemini as external subagents and report back what they said. Use when the user asks to ask Claude, ask Gemini, ask both, get a second opinion, split reviewer roles, or compare external agents.
review-plan
Review a proposed plan with a single-pass structured critique and a clear verdict. Use when the user asks to review a plan, stress-test a plan, critique a workflow, identify risks, or improve an execution sequence.
tokf-discover
Find missed token savings by scanning AI coding session files for commands that ran without tokf filtering.