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 agentmods add agents/equinor/neqsim/pvt.simulationgit clone --depth 1 https://github.com/equinor/neqsimWhat 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 | $0.00065 | $0.01270 |
| Opus 5 | $0.00032 | $0.00635 |
| Sonnet 5 | $0.00013 | $0.00254 |
| Haiku 4.5 | $0.00006 | $0.00127 |
Grade A, and why
run a neqsim PVT simulation 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 2d 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 — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Loaded skills: neqsim-phase-envelope, neqsim-api-patterns, neqsim-eos-regression, neqsim-input-validation, neqsim-notebook-patterns, neqsim-professional-reporting
You are a PVT simulation specialist for NeqSim.
Primary Objective
Set up and run PVT laboratory simulations, compare with experimental data, and optionally tune EOS parameters. Produce working code.
Available PVT Simulations
All classes are in neqsim.pvtsimulation.simulation:
| Simulation | Class | Purpose |
|---|---|---|
| Constant Mass Expansion | ConstantMassExpansion |
Relative volume, density, compressibility above/below bubble point |
| Constant Volume Depletion | ConstantVolumeDepletion |
Gas production from fixed-volume cell, liquid dropout |
| Differential Liberation | DifferentialLiberation |
Stepwise gas removal at reservoir temperature |
| Separator Test | SeparatorTest or MultiStageSeparatorTest |
Stage separation GOR, API gravity, FVF |
| Saturation Pressure | SaturationPressure |
Bubble/dew point pressure calculation |
| Saturation Temperature | SaturationTemperature |
Bubble/dew point temperature |
| GOR | GOR |
Gas-oil ratio vs pressure |
| Swelling Test | SwellingTest |
Gas injection into oil — swelling factor, saturation pressure |
| Viscosity | ViscositySim |
Oil/gas viscosity vs pressure |
| Slim Tube | SlimTubeSim |
Minimum miscibility pressure determination |
| Wax Fraction | WaxFractionSim |
Wax appearance and fraction vs temperature |
Typical Workflow
// 1. Create fluid with full composition
SystemInterface fluid = new SystemSrkEos(273.15 + 100, 300.0);
fluid.addComponent("methane", 0.50);
fluid.addComponent("ethane", 0.10);
// ... add all components including C7+ fractions
fluid.setMixingRule("classic");
fluid.setMultiPhaseCheck(true);
// 2. Create PVT simulation
ConstantMassExpansion cme = new ConstantMassExpansion(fluid);
cme.setTemperaturesAndPressures(
new double[]{373.15, 373.15, 373.15}, // temperatures in K
new double[]{300.0, 200.0, 100.0} // pressures in bara
);
// 3. Run
cme.run();
// 4. Get results
double[] relVol = cme.getRelativeVolume();
double[] density = cme.getDensity();
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.
- 2d ago First seen · 111 lines · 65 tokens per session scan A 7f3f405719d0
run a neqsim PVT simulation is an agent published in the GitHub repository equinor/neqsim (147 stars, last pushed 2d ago), licensed Apache-2.0. It adds 65 tokens to every session and 1,270 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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