Borrowing it
Nothing to install: this file belongs to equinor/neqsim. 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/equinor/neqsim/master/.github/skills/neqsim-ccs-hydrogen/SKILL.mdgit clone --depth 1 https://github.com/equinor/neqsimWrote 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/equinor/neqsim/neqsim-ccs-hydrogen)<a href="https://agentmods.dev/skills/equinor/neqsim/neqsim-ccs-hydrogen"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-ccs-hydrogen/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/equinor/neqsim/neqsim-ccs-hydrogen"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-ccs-hydrogen.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 | $0.00085 | $0.04050 |
| Opus 5 | $0.00043 | $0.02025 |
| Sonnet 5 | $0.00017 | $0.00810 |
| Haiku 4.5 | $0.00009 | $0.00405 |
Grade A, and why
neqsim-ccs-hydrogen 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 11d 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 — 381 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CCS and Hydrogen Systems with NeqSim
Guide for modeling carbon capture and storage (CCS) value chains and hydrogen systems, including CO2 transport, injection wells, impurity effects, and H2 blending.
When to Use This Skill
- CO2 pipeline design and phase behavior
- CO2 injection well analysis and safety
- Impurity effects on CO2 phase envelope (H2, N2, O2, H2S, CH4)
- Dense phase CO2 transport conditions
- CO2 dehydration requirements
- Hydrogen blending with natural gas
- Water electrolysis and green hydrogen
- Blue hydrogen (SMR/ATR + CCS)
- Hydrogen pipeline transport
Applicable Standards
| Domain | Standards | Key Requirements |
|---|---|---|
| CO2 pipeline | DNV-RP-F104, ISO 27913, DNV-ST-F101 | Project composition/phase envelope, transport hydraulics, structural design, fracture/materials/corrosion and lifecycle evidence |
| CO2 storage | ISO 27914, EU CCS Directive | Storage site characterization |
| CO2 transport | ISO 27913 | Composition specs, phase management |
| CO2 quality | ISO 27916 | CO2 stream specification |
| Hydrogen pipeline | ASME B31.12 | H2 piping and pipelines |
| Hydrogen quality | ISO 14687 (fuel cell), EN 16726 (grid) | Purity requirements |
1. CO2 Phase Behavior
CO2 Critical Point and Phase Envelope
The pure-CO2 critical point is useful for model verification, but it is not a transport acceptance boundary for an impure project stream. Calculate and validate the phase envelope for the actual bounded composition and operating path.
// Pure CO2 phase behavior
SystemInterface co2 = new SystemSrkEos(273.15 + 25, 80.0);
co2.addComponent("CO2", 1.0);
co2.setMixingRule("classic");
ThermodynamicOperations ops = new ThermodynamicOperations(co2);
ops.calcPTphaseEnvelope();
// Inspect the calculated phase state; do not infer F104 acceptance from pure-CO2 P/T alone.
Impurity Effects on CO2 Phase Envelope
Impurities widen the phase envelope and raise the cricondenbar, creating risk of two-phase flow in pipelines designed for dense phase operation.
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.
- 11d ago First seen · 381 lines · 85 tokens per session scan A 73f723229c4e
neqsim-ccs-hydrogen is a skill published in the GitHub repository equinor/neqsim (151 stars, last pushed today), licensed Apache-2.0. It adds 85 tokens to every session and 4,050 once invoked, about $0.0004 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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