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 mvanhorn/printing-press-library --skill pp-ars-siciliagit clone --depth 1 https://github.com/mvanhorn/printing-press-libraryWrote 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/mvanhorn/printing-press-library/pp-ars-sicilia)<a href="https://agentmods.dev/skills/mvanhorn/printing-press-library/pp-ars-sicilia"><img src="https://agentmods.dev/badge/skills/mvanhorn/printing-press-library/pp-ars-sicilia/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/mvanhorn/printing-press-library/pp-ars-sicilia"><img src="https://agentmods.dev/badge/skills/mvanhorn/printing-press-library/pp-ars-sicilia.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 | $0.00089 | $0.18820 |
| Opus 5 | $0.00044 | $0.09410 |
| Sonnet 5 | $0.00018 | $0.03764 |
| Haiku 4.5 | $0.00009 | $0.01882 |
Grade C, and why
pp-ars-sicilia scanned grade C with 2 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 4d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- GENERATED FILE — DO NOT EDIT. This file is a verbatim mirror of library/other/ars-sicilia/SKILL.md, regenerated post-merge by tools/generate-skills/. Hand-edits here are silently overwritten on the next regen. Edit Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
# poi, se serve il testo: curl -sL "<pdf_url>" -o seduta.pdf The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 4d ago Changed · +34 lines 50c5a87cb288
- 7d ago Changed · +4 lines 75af21c8f457
- 9d ago Changed · +18 lines 299e5ccb3540
- 11d ago First seen · 566 lines · 89 tokens per session scan C e0cc041e63bd
pp-ars-sicilia is a skill published in the GitHub repository mvanhorn/printing-press-library (1,999 stars, last pushed yesterday), with no licence file. It adds 89 tokens to every session and 18,820 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it C with 2 findings (hidden instructions, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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