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 HermeticOrmus/magnum-opus-skills --skill magnum-opusgit clone --depth 1 https://github.com/HermeticOrmus/magnum-opus-skillsWrote 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/hermeticormus/magnum-opus-skills/magnum-opus)<a href="https://agentmods.dev/skills/hermeticormus/magnum-opus-skills/magnum-opus"><img src="https://agentmods.dev/badge/skills/hermeticormus/magnum-opus-skills/magnum-opus/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/hermeticormus/magnum-opus-skills/magnum-opus"><img src="https://agentmods.dev/badge/skills/hermeticormus/magnum-opus-skills/magnum-opus.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 | $0.00066 | $0.00251 |
| Opus 5 | $0.00033 | $0.00125 |
| Sonnet 5 | $0.00013 | $0.00050 |
| Haiku 4.5 | $0.00007 | $0.00025 |
Grade A, and why
magnum-opus 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
Magnum Opus
Stages
- Calcination 🜂 — Burn what doesn't serve
- Dissolution 🜄 — Let understanding flow
- Separation 🜁 — Gold from dross
- Conjunction ☌ — Unite opposites
- Fermentation 🜅 — Trial by failure
- Distillation ⊚ — Refine to wisdom
- Coagulation 🜍 — Crystallize into form
Solve et coagula
Stages 1-3 dissolve; stages 4-7 coagulate.
When
Project transformation (major change). Not for features, bugs, or routine refactoring.
Full content at https://github.com/HermeticOrmus/magnum-opus-skills.
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 · 30 lines · 0 tokens per session scan A c9be913958cd
magnum-opus is a skill published in the GitHub repository HermeticOrmus/magnum-opus-skills (2 stars, last pushed 3mo ago), licensed MIT. It adds 66 tokens to every session and 251 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 2026-08-31.
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