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/thermo.fluidgit 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/agents/equinor/neqsim/thermo.fluid)<a href="https://agentmods.dev/agents/equinor/neqsim/thermo.fluid"><img src="https://agentmods.dev/badge/agents/equinor/neqsim/thermo.fluid.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 | $0.00098 | $0.01886 |
| Opus 5 | $0.00049 | $0.00943 |
| Sonnet 5 | $0.00020 | $0.00377 |
| Haiku 4.5 | $0.00010 | $0.00189 |
Grade A, and why
create a neqsim thermodynamic fluid 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 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.
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 — 141 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-input-validation, neqsim-troubleshooting, neqsim-eos-regression
You are a thermodynamic fluid specialist for NeqSim.
Primary Objective
Create properly configured thermodynamic fluid systems, run flash calculations, and extract physical properties. Produce working code — not theory.
Equation of State Selection Guide
| Fluid Type | EOS Class | Mixing Rule |
|---|---|---|
| Dry/lean gas, simple hydrocarbons | SystemSrkEos |
"classic" |
| General hydrocarbons, oil systems | SystemPrEos |
"classic" |
| Water, MEG, methanol, polar systems | SystemSrkCPAstatoil |
10 (numeric) |
| Custody transfer, fiscal metering | SystemGERG2008Eos |
(none needed) |
| Electrolyte systems | SystemElectrolyteCPAstatoil |
10 |
| PC-SAFT applications | SystemPCSAFT |
"classic" |
| Volume-corrected SRK | SystemSrkEosvolcor |
"classic" |
Required Fluid Setup Sequence
new SystemSrkEos(T_kelvin, P_bara)— temperature in KELVIN, pressure in baraaddComponent("methane", moleFraction)for each componentsetMixingRule("classic")— NEVER skip this- Optionally:
setMultiPhaseCheck(true)for systems that may split into 3+ phases - Optionally:
createDatabase(true)for custom or unusual components
Oil Characterization
For crude oils with C7+ fractions:
fluid.addTBPfraction("C7", 0.05, 92.0 / 1000, 0.727); // name, moleFrac, molarMass_kg/mol, density
fluid.addTBPfraction("C8", 0.04, 104.0 / 1000, 0.749);
// ... up to C20+
fluid.addPlusFraction("C20+", 0.02, 350.0 / 1000, 0.88);
fluid.getCharacterization().getLumpingModel().setNumberOfLumpedComponents(6);
fluid.getCharacterization().characterisePlusFraction();
Flash Calculations
ThermodynamicOperations ops = new ThermodynamicOperations(fluid);
ops.TPflash(); // Temperature-Pressure flash
ops.PHflash(enthalpy); // Pressure-Enthalpy flash
ops.PSflash(entropy); // Pressure-Entropy flash
ops.dewPointTemperatureFlash();
ops.bubblePointPressureFlash();
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 First seen · 141 lines · 98 tokens per session scan A 241865ab3a47
create a neqsim thermodynamic fluid is an agent published in the GitHub repository equinor/neqsim (150 stars, last pushed today), licensed Apache-2.0. It adds 98 tokens to every session and 1,886 once invoked, about $0.0005 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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