simulate-modelica

simulate-modelica is a skill for Claude Code, Codex from WolframResearch/system-modeler-ai-toolkit. It costs 171 tokens per session (4,562 once invoked), scanned C, original, MIT.

A procedure for running simulations of Modelica models, which are computer descriptions of physical systems such as machines or energy systems. It compiles a Modelica file into a runnable program and produces simulation results in a MAT file.

In plain words
What is it for?
Use it to simulate .mo files or multi-file Modelica libraries and obtain their results. It does not create plots.
Why use it?
It handles the compilation and execution steps needed to turn a Modelica model into numerical results.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/wolframresearch/system-modeler-ai-toolkit/simulate-modelica
Any agent
npx skills add WolframResearch/system-modeler-ai-toolkit --skill simulate-modelica
Clone the repo
git clone --depth 1 https://github.com/WolframResearch/system-modeler-ai-toolkit

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for simulate-modelica

README.md
[![agentmods](https://agentmods.dev/badge/skills/wolframresearch/system-modeler-ai-toolkit/simulate-modelica.svg)](https://agentmods.dev/skills/wolframresearch/system-modeler-ai-toolkit/simulate-modelica)
Your own site
<a href="https://agentmods.dev/skills/wolframresearch/system-modeler-ai-toolkit/simulate-modelica"><img src="https://agentmods.dev/badge/skills/wolframresearch/system-modeler-ai-toolkit/simulate-modelica.svg" alt="Measured on agentmods" height="20"></a>
Per session 171 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,562 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00171 $0.04562
Opus 5 $0.00086 $0.02281
Sonnet 5 $0.00034 $0.00912
Haiku 4.5 $0.00017 $0.00456

Measured 5d ago against content hash c22b25c06db3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade C, and why

simulate-modelica scanned grade C with 1 finding 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 5d 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

shell-agnostic. For cleanup use `Remove-Item -Recurse -Force`, not `rm -rf`.
simulate-modelica/SKILL.md · 313 lines

How it starts

The opening of the file, as written. The whole thing — 313 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Simulate Modelica Model

This skill simulates Modelica models (.mo files) with WSMKernelX: it flattens the model, generates C++ code, compiles it, and runs the simulation. It produces a .mat results file.

Before you run anything

This skill drives WSMKernelX through the shared launcher ../scripts/wsm_run.py. Read the shared-conventions appendix at the end of this file first — launcher resolution, the Windows-vs-Unix shell/Python rules, the temp-dir and cleanup conventions, the JSON-array output gotcha, and the MSL 4.x dialect notes that every step below assumes.

The launcher works in _wsm_simulate_temp/ next to the .mo file and leaves simulate.out.json and the .mat there. Tell the user: "Working in temporary directory _wsm_simulate_temp/. This will be deleted after simulation."

Workflow

1. Identify the model file and name

Identify the .mo file and extract the model name — see Appendix → Picking the model name. For a directory-form (multi-file) library, point --model at the library folder (not one class file) and pass the full dotted --name — see Appendix → Directory-form (multi-file) libraries.

2. Run the simulation

python3 "<scripts-dir>/wsm_run.py" --mode simulate \
  --model "<path-to-ModelFile.mo>" --name ModelName --timeout 180

Terser loop: add --quiet to print only a one-line outcome (status + integration time + result file) instead of the full kernel log, and --report "Vout,x.T" to print a compact min/max/mean/pp/final table of those variables straight from the result .mat — so the common "simulate then inspect a few values" step is a single call. (--report runs mat_summary.py, which you can also call standalone on any .mat.)

The launcher auto-detects MSL usage and loads the right version; force it with --msl yes|no or --msl-version 4.1.0. If the model uses an installed non-MSL library (e.g. Hydraulic), add --load-library <Name> — see Appendix → Using non-MSL libraries. Timeout: allow up to 180 seconds — compilation and simulation of complex models can take time.

Read the full file on GitHub · 313 lines

Changes

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.

  1. 5d ago First seen · 313 lines · 171 tokens per session scan C c22b25c06db3

Subscribe to this mod's changes

simulate-modelica is a skill published in the GitHub repository WolframResearch/system-modeler-ai-toolkit (10 stars, last pushed 16d ago), licensed MIT. It adds 171 tokens to every session and 4,562 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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