What is circuit-design-ngspice?

A circuit-design tool for creating, simulating, and rendering SPICE and PCB or analog-chip schematics. SPICE is software that predicts how an electronic circuit behaves from a circuit description.

Use it to design circuits, create or simulate SPICE netlists, render schematics, and improve automatic placement or routing for the Vibe Analog project canvas.

It supports checking circuit behaviour and producing a visual schematic from the design. This helps catch problems before working with physical electronics.

circuit-design-ngspice — Skill for Codex by DeconBear

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 DeconBear/vibe-analog --skill circuit-design-ngspice

Clone the repo

git clone --depth 1 https://github.com/DeconBear/vibe-analog

Made for: 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/deconbear/vibe-analog/circuit-design-ngspice/github.svg)](https://agentmods.dev/skills/deconbear/vibe-analog/circuit-design-ngspice)

Your own site

<a href="https://agentmods.dev/skills/deconbear/vibe-analog/circuit-design-ngspice"><img src="https://agentmods.dev/badge/skills/deconbear/vibe-analog/circuit-design-ngspice/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/deconbear/vibe-analog/circuit-design-ngspice"><img src="https://agentmods.dev/badge/skills/deconbear/vibe-analog/circuit-design-ngspice.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 124 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,992 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 unknown 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	$0.00124	$0.02992
Opus 5	$0.00062	$0.01496
Sonnet 5	$0.00025	$0.00598
Haiku 4.5	$0.00012	$0.00299

Measured 6d ago against content hash 40bd39b44835, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

circuit-design-ngspice 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 6d 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.

skills/circuit-design-ngspice/SKILL.md · 226 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

6d ago Changed · +7 lines 40bd39b44835
11d ago First seen · 219 lines · 124 tokens per session scan A d51ec9d311f8

Subscribe to this mod's changes

circuit-design-ngspice is a skill published in the GitHub repository DeconBear/vibe-analog (5 stars, last pushed 8d ago), with no licence file. It adds 124 tokens to every session and 2,992 once invoked, about $0.0006 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 2026-08-31.

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