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-dynamic-equipment-implementation/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-dynamic-equipment-implementation)<a href="https://agentmods.dev/skills/equinor/neqsim/neqsim-dynamic-equipment-implementation"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-dynamic-equipment-implementation/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-dynamic-equipment-implementation"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-dynamic-equipment-implementation.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 | $0.00060 | $0.02718 |
| Opus 5 | $0.00030 | $0.01359 |
| Sonnet 5 | $0.00012 | $0.00544 |
| Haiku 4.5 | $0.00006 | $0.00272 |
Grade A, and why
neqsim-dynamic-equipment-implementation 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 yesterday.
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 — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dynamic Equipment Implementation
Use this skill when a NeqSim equipment class needs real dynamic simulation support instead of the default steady-state fallback or unsupported transient behavior.
This complements neqsim-dynamic-simulation, which explains how to run dynamic studies. This skill explains how to implement and test the Java code that makes equipment participate correctly in ProcessSystem.runTransient(dt, id).
Local Architecture
SimulationInterface.runTransient(double dt, UUID id)defaults to steady-staterun(id)whengetCalculateSteadyState()is true, otherwise throwsUnsupportedOperationException.ProcessSystem.runTransient(dt, id)steps eachProcessEquipmentInterfacethrough a skip-aware wrapper and callsunit.runTransient(dt, id).- Equipment that has real dynamic behavior must override
runTransient(double dt, UUID id). - Existing reference implementations include
Separator,ThreePhaseSeparator,Tank,Compressor,ThrottlingValve,SafetyValve,BlowdownValve,PipeBeggsAndBrills,WaterHammerPipe,SimpleReservoir, andWellFlow. - All dynamic equipment code must remain Java 8 compatible, use Log4j2 for logging, and pass Spotless formatting.
Implementation Decision Tree
-
Is the equipment purely algebraic?
- Examples: simple pressure drop, splitter ratio, ideal heater with no metal/fluid holdup.
- Implement only if needed to propagate controller or actuator dynamics; otherwise the steady-state fallback may be sufficient.
-
Does the equipment hold mass or energy inventory?
- Examples: separator, tank, column tray/section, adsorber bed, exchanger volume, pipe segment, reactor, accumulator.
- Add explicit volume/holdup state and integrate component moles and internal energy over
dt.
-
Does the equipment have actuator or mechanical state?
- Examples: compressor shaft speed, valve opening, pump ramp, fan speed, bed switching, recycle valve position.
- Add bounded state variables, ramp-rate limits, and controller hooks.
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.
- yesterday Changed · +59 lines b578aa0617fe
- 9d ago First seen · 134 lines · 60 tokens per session scan A 2b3aaf97257c
neqsim-dynamic-equipment-implementation is a skill published in the GitHub repository equinor/neqsim (151 stars, last pushed today), licensed Apache-2.0. It adds 60 tokens to every session and 2,718 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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