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 instructions/ombulabs/claude-code_dual-boot-skill/claude-mdgit clone --depth 1 https://github.com/ombulabs/claude-code_dual-boot-skillWrote 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/instructions/ombulabs/claude-code_dual-boot-skill/claude-md)<a href="https://agentmods.dev/instructions/ombulabs/claude-code_dual-boot-skill/claude-md"><img src="https://agentmods.dev/badge/instructions/ombulabs/claude-code_dual-boot-skill/claude-md.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 5.1 | $0.01333 | $0.01333 |
| Opus 5 | $0.00666 | $0.00666 |
| Sonnet 5 | $0.00267 | $0.00267 |
| Haiku 4.5 | $0.00133 | $0.00133 |
Grade A, and why
claude-code_dual-boot-skill CLAUDE.md 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 5d 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 — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file guides Claude Code when working in this repository. This repo is the
source for the dual-boot Claude Code skill — a plugin that helps end users set up
and manage dual-boot Ruby/Rails environments with the next_rails
gem.
When Claude is invoked here, the task is almost always to author, maintain, or enhance the skill itself — not to perform a Rails upgrade on some host app.
What this repository is
A packaged Claude Code skill distributed as a plugin. The skill's authoring surface
lives in dual-boot/:
dual-boot/SKILL.md— skill entry point and trigger patterns (authoritative)dual-boot/workflows/— step-by-step procedures (setup-workflow.md,cleanup-workflow.md)dual-boot/references/— supporting docs (code patterns, CI, Gemfile examples, deprecation tracking)dual-boot/examples/— worked examplesdual-boot/CHANGELOG.md— version history
Top-level files:
.claude-plugin/plugin.json— plugin manifestREADME.md— user-facing install + usageLICENSE
Scope: stay inside the dual-boot boundary
This skill is part of a three-skill FastRuby.io toolkit. Each skill owns a distinct concern, and this repo must not grow guidance that belongs to the siblings.
In scope for this skill:
- Installing/configuring the
next_railsgem - Gemfile conventions for two dependency sets (Rails, Ruby, or any core gem)
NextRails.next?/NextRails.current?branching patterns in application code- CI wiring for both dependency sets (GitHub Actions, CircleCI, Jenkins)
Gemfile.next/Gemfile.next.locklifecycle- Cleanup after the upgrade lands
- Deprecation-warning visibility (because silenced warnings make dual-boot useless)
Out of scope — belongs to sibling skills, do NOT add here:
- Rails version-specific breaking changes, deprecations, or migration steps → rails-upgrade
app:updateguidance, per-version upgrade reports, detection scripts → rails-upgrade- Walking
config.load_defaultsforward,new_framework_defaults_*.rbhandling, per-config risk tiers, initializer consolidation → rails-load-defaults - Gem compatibility resolution, monkeypatch debugging, time estimates, LTS upgrades
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.
- 5d ago First seen · 112 lines · 1,333 tokens per session scan A faf99043d0ae
claude-code_dual-boot-skill CLAUDE.md is an instructions file published in the GitHub repository ombulabs/claude-code_dual-boot-skill (13 stars, last pushed 1mo ago), licensed MIT. It adds 1,333 tokens to every session, about $0.0067 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 2026-08-30.
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