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 Goldziher/ai-rulez --skill magnus-bindingsgit clone --depth 1 https://github.com/Goldziher/ai-rulezWrote 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/goldziher/ai-rulez/magnus-bindings)<a href="https://agentmods.dev/skills/goldziher/ai-rulez/magnus-bindings"><img src="https://agentmods.dev/badge/skills/goldziher/ai-rulez/magnus-bindings/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/goldziher/ai-rulez/magnus-bindings"><img src="https://agentmods.dev/badge/skills/goldziher/ai-rulez/magnus-bindings.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00058 | $0.00309 |
| Opus 5 | $0.00029 | $0.00154 |
| Sonnet 5 | $0.00012 | $0.00062 |
| Haiku 4.5 | $0.00006 | $0.00031 |
Grade A, and why
magnus-bindings 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 12d 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.
What it actually says
- Use
magnuscrate for Ruby native extensions. Define classes withmagnus::define_class. - Map Rust types to Ruby using
TryConvertandIntoValuetraits. ReturnResult<T, magnus::Error>. - Use
magnus::function!macro for defining Ruby methods. Usemagnus::method!for instance methods. - Map Rust errors to specific Ruby exceptions:
magnus::Error::new(exception::runtime_error(), msg). - Build with
rb_syscrate andmagnus-buildfor compilation. Userake-compilerfor gem distribution. - Support Ruby 3.2+ with multiple ABI versions.
- Test bindings from Ruby using RSpec or Minitest. Test error handling and edge cases.
- Keep Ruby wrapper gem thin — business logic in Rust, Ruby provides idiomatic API.
- Handle Ruby's GVL (Global VM Lock) — release for CPU-intensive Rust code.
- Use
TypedDatafor wrapping Rust structs as Ruby objects with proper GC integration. - Anti-patterns: panics in Ruby methods,
unsafewithoutSAFETYcomments, manual memory management.
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.
- 12d ago First seen · 17 lines · 58 tokens per session scan A 2ed42b0713ea
magnus-bindings is a skill published in the GitHub repository Goldziher/ai-rulez (141 stars, last pushed 4d ago), licensed MIT. It adds 58 tokens to every session and 309 once invoked, about $0.0003 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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