Borrowing it
Nothing to install: this file belongs to saski/arnesto. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saski/arnesto/main/.agents/skills/skill-foundry/SKILL.mdgit clone --depth 1 https://github.com/saski/arnestoWrote 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/saski/arnesto/skill-foundry)<a href="https://agentmods.dev/skills/saski/arnesto/skill-foundry"><img src="https://agentmods.dev/badge/skills/saski/arnesto/skill-foundry.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 | $0.00000 | $0.00011 |
| Opus 5 | $0.00000 | $0.00005 |
| Sonnet 5 | $0.00000 | $0.00002 |
| Haiku 4.5 | $0.00000 | $0.00001 |
Grade A, and why
skill-foundry 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 3d 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
agents/skills/skill-foundry/SKILL.md
What ships with it
14 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.
- agents/catalog-engineering.yaml 52 KB
- agents/catalog-product-management.yaml 10 KB
- agents/catalog.yaml 703 B
- agents/skills/skill-foundry/assets/catalog-entry-template.yaml 288 B
- agents/skills/skill-foundry/assets/eval-plan-template.md 449 B
- agents/skills/skill-foundry/assets/intake-template.md 652 B
- agents/skills/skill-foundry/assets/skill-template.md 572 B
- agents/skills/skill-foundry/references/anti-patterns.md 673 B
- agents/skills/skill-foundry/references/description-heuristics.md 994 B
- agents/skills/skill-foundry/references/eval-checklist.md 930 B
- agents/skills/skill-foundry/references/lifecycle-playbook.md 941 B
- agents/skills/skill-foundry/SKILL.md 5.6 KB
- agents/taxonomy.md 1.8 KB
- README.md 715 B
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.
- 3d ago First seen · 1 lines · 0 tokens per session scan A a48d377f42c5
skill-foundry is a skill published in the GitHub repository saski/arnesto (5 stars, last pushed today), licensed Unlicense. It costs nothing until one of its globs matches a file; then it loads 11 tokens. 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.
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