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 skills add aki77/csb --skill ruby-rails-ci-matrixgit clone --depth 1 https://github.com/aki77/csbWrote 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/aki77/csb/ruby-rails-ci-matrix)<a href="https://agentmods.dev/skills/aki77/csb/ruby-rails-ci-matrix"><img src="https://agentmods.dev/badge/skills/aki77/csb/ruby-rails-ci-matrix/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/aki77/csb/ruby-rails-ci-matrix"><img src="https://agentmods.dev/badge/skills/aki77/csb/ruby-rails-ci-matrix.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 | $0.00075 | $0.01350 |
| Opus 5.5 | $0.00030 | $0.00540 |
| Sonnet 5.5 | $0.00015 | $0.00270 |
| Haiku 4.5 | $0.00007 | $0.00135 |
Grade A, and why
ruby-rails-ci-matrix 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 — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ruby-rails-ci-matrix
Maintain the Ruby and Rails versions tested in CI for a Ruby gem that uses GitHub Actions matrix strategy with gemfiles/railsXX.gemfile and a gemspec. This skill keeps the test matrix aligned with the current support status.
Remove EOL (End of Life) versions and add currently supported and latest stable versions. The gemfile, gemspec, and workflow YAML must be updated in sync — updating only one will break CI.
1. Assess the Current State
Before making any changes, read all three types of files involved.
| File | What to check |
|---|---|
.github/workflows/*.yml |
strategy.matrix.include entries ({ ruby:, gemfile: }), ruby/setup-ruby version |
gemfiles/*.gemfile |
Per-Rails-version gemfiles — source URL and gem 'rails', '~> X.Y.0' |
*.gemspec |
required_ruby_version and the lower bound of add_dependency "rails", ... |
Note that the gemfile: values in the matrix correspond 1:1 with gemfiles/<value>.gemfile.
2. Research EOL Status
Use today's date as the reference and fetch the latest support information — do not rely on memory.
- Ruby: https://endoflife.date/ruby
- Rails: https://endoflife.date/rails
If endoflife.date is unreachable, use WebSearch as a fallback. Confirm the following three things:
- EOL date for each version (including security support end date) — has it passed as of today?
- Full list of currently supported versions
- Latest stable releases (check whether a new major like Ruby 4.0 or Rails 8.1 has been released)
Ruby releases a new version every December with ~3 years 3 months of support. Rails 7.2+ receives 1 year of standard support and 2 years of security support.
3. Decide What to Add and Remove
- Remove: Ruby / Rails versions that are EOL (security support also ended) as of today.
- Add: Supported versions not yet in the matrix, plus the latest stable releases.
- Keep: Versions still under security support. For versions expiring within a few months, ask the user whether to keep them.
- Build the matrix as each Rails version × the compatible Ruby versions. Pay attention to compatibility — older Rails versions may not support the newest Ruby.
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 · 109 lines · 75 tokens per session scan A bcd596aede59
ruby-rails-ci-matrix is a skill published in the GitHub repository aki77/csb (50 stars, last pushed 4mo ago), licensed MIT. It adds 75 tokens to every session and 1,350 once invoked, about $0.0003 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 2026-08-30.
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