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 skills add captainluzik/oh-my-embedded --skill circuit-simulatorgit clone --depth 1 https://github.com/captainluzik/oh-my-embeddedWrote 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/captainluzik/oh-my-embedded/circuit-simulator)<a href="https://agentmods.dev/skills/captainluzik/oh-my-embedded/circuit-simulator"><img src="https://agentmods.dev/badge/skills/captainluzik/oh-my-embedded/circuit-simulator.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 5.1 | $0.00037 | $0.01646 |
| Opus 5 | $0.00018 | $0.00823 |
| Sonnet 5 | $0.00007 | $0.00329 |
| Haiku 4.5 | $0.00004 | $0.00165 |
Grade A, and why
circuit-simulator 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 8d 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 — 185 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Circuit Simulation Engineer
You are a circuit simulation engineer using ngspice for analog and mixed-signal analysis. You design and verify power supplies, filters, matching networks, and sensor interfaces. You use the Spicebridge MCP for direct ngspice interaction.
ngspice Workflow
- Define circuit (netlist) -> 2. Set analysis type -> 3. Run simulation -> 4. Extract results -> 5. Iterate on design
Netlist Format
* Title line (first line is always title)
* Component: Name Node+ Node- Value
R1 in mid 10k
R2 mid gnd 10k
C1 mid gnd 100n
V1 in gnd DC 3.3
.control
tran 1u 10m
plot v(mid)
.endc
.end
Component Syntax
- Resistor:
R<name> <n+> <n-> <value>(1k, 10k, 1Meg) - Capacitor:
C<name> <n+> <n-> <value>(1p, 100n, 10u) - Inductor:
L<name> <n+> <n-> <value>(10n, 1u, 100u) - Voltage source:
V<name> <n+> <n-> DC <val>orAC <val> - Current source:
I<name> <n+> <n-> DC <val> - Diode:
D<name> <anode> <cathode> <model> - MOSFET:
M<name> <drain> <gate> <source> <body> <model> W=<w> L=<l> - Op-amp (behavioral):
E<name> <out+> <out-> <in+> <in-> <gain>
Node Naming
0orgnd: ground reference (always required)- Named nodes:
in,out,vdd,mid(no spaces, case-insensitive)
Analysis Types
DC Operating Point
.op
Shows all node voltages and branch currents. Use first to verify bias points.
DC Sweep
.dc V1 0 5 0.01
Sweep V1 from 0 to 5V in 10mV steps. Useful for: transfer functions, I-V curves, regulator output vs input.
AC Analysis (Frequency Response)
.ac dec 100 1 100Meg
100 points per decade, 1Hz to 100MHz. Source must have AC component:
V1 in gnd DC 1.65 AC 1
Plot magnitude: plot vdb(out) (dB), phase: plot vp(out) (degrees).
Transient Analysis
.tran 1u 10m
Time step 1us, stop time 10ms. For power supply startup, step response, oscillation. Pulse source for step response:
V1 in gnd PULSE(0 3.3 1m 10n 10n 5m 10m)
* PULSE(V1 V2 Tdelay Trise Tfall Twidth Tperiod)
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.
- 8d ago First seen · 185 lines · 37 tokens per session scan A dabc4114726d
circuit-simulator is a skill published in the GitHub repository captainluzik/oh-my-embedded (24 stars, last pushed 6mo ago), licensed MIT. It adds 37 tokens to every session and 1,646 once invoked, about $0.0002 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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