A guide for working with Ansys HFSS 3D, a tool for simulating electromagnetic fields and devices, through its desktop application or Python-based controls.

Inspecting, creating, editing, solving, monitoring, exporting, and debugging HFSS 3D models. It does not cover HFSS 3D Layout or other Ansys Electronics Desktop products.

It helps choose a suitable control method, check that the required software is available, and inspect models, runs, exports, or errors without assuming every Ansys product is supported.

hfss — Skill for Claude Code and Codex by svd-ai-lab/sim-cli

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.

Any agent

npx skills add svd-ai-lab/sim-cli --skill hfss

Clone the repo

git clone --depth 1 https://github.com/svd-ai-lab/sim-cli

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/svd-ai-lab/sim-cli/hfss/github.svg)](https://agentmods.dev/skills/svd-ai-lab/sim-cli/hfss)

Your own site

<a href="https://agentmods.dev/skills/svd-ai-lab/sim-cli/hfss"><img src="https://agentmods.dev/badge/skills/svd-ai-lab/sim-cli/hfss/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/svd-ai-lab/sim-cli/hfss"><img src="https://agentmods.dev/badge/skills/svd-ai-lab/sim-cli/hfss.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,525 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00060	$0.02525
Opus 5.5	$0.00024	$0.01010
Sonnet 5.5	$0.00012	$0.00505
Haiku 4.5	$0.00006	$0.00252

Measured 2d ago against content hash b8f1a5f2467c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hfss 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.

plugins/hfss/src/sim_plugin_hfss/_skills/hfss/SKILL.md · 252 lines

How it starts

The opening of the file, as written. The whole thing — 252 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HFSS Skill

Use this skill for Ansys HFSS 3D work.

This plugin targets HFSS 3D through PyAEDT and AEDT. It does not yet cover HFSS 3D Layout, Maxwell, Icepak, Q3D, Circuit, or generic AEDT workflows.

sim-cli is a control and observability layer, not the only valid execution path. Use sim check, sim connect, sim inspect, and bounded sim exec snippets when they add discovery, session control, or structured evidence. Use plain PyAEDT scripts, AEDT executables, vendor batch flows, or GUI operation when those are the narrower reliable primitive. The evidence standard is the same for every path.

Required Protocol

Run an HFSS/AEDT availability probe before launch or solve.
- Use sim check hfss when sim-cli is available.
- Acceptable alternatives: a PyAEDT import/version probe, AEDT executable path probe, Windows Registry/default-install probe, or environment variable probe.
- When probing nested Python packages such as ansys.aedt.core, catch ModuleNotFoundError; a missing top-level ansys package is evidence that the control package is absent, not a reason to launch AEDT for discovery.
- Do not use -help on ansysedt.exe, ansysedtsv.exe, or hfss.exe as an availability probe. AEDT Student can open a modal Electronics Desktop Student Help window and block automation when launched this way.
- Missing sim-cli is not evidence that AEDT/HFSS is missing.
If no AEDT installation is found, stop and ask for an AEDT installation or SIM_HFSS_AEDT_ROOT path. Do not invent install paths.
Prefer no-GUI operation unless the user needs visual review or the workflow cannot expose the required state programmatically.
Before setup, solve, export, or result interpretation, inspect the active project/design using the best available path:

sim inspect session.versions
sim inspect session.summary
sim inspect hfss.project.identity
sim inspect hfss.design.summary
sim inspect hfss.model.summary
sim inspect hfss.boundaries.summary
sim inspect hfss.setups.summary

Read the full file on GitHub · 252 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.

2d ago First seen · 252 lines · 60 tokens per session scan A b8f1a5f2467c

Subscribe to this mod's changes

hfss is a skill published in the GitHub repository svd-ai-lab/sim-cli (239 stars, last pushed yesterday), licensed Apache-2.0. It adds 60 tokens to every session and 2,525 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-19.

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