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 hdl-tools/analog-chip-design-agents --skill parasitic-extractiongit clone --depth 1 https://github.com/hdl-tools/analog-chip-design-agentsWrote 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/hdl-tools/analog-chip-design-agents/parasitic-extraction)<a href="https://agentmods.dev/skills/hdl-tools/analog-chip-design-agents/parasitic-extraction"><img src="https://agentmods.dev/badge/skills/hdl-tools/analog-chip-design-agents/parasitic-extraction/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/hdl-tools/analog-chip-design-agents/parasitic-extraction"><img src="https://agentmods.dev/badge/skills/hdl-tools/analog-chip-design-agents/parasitic-extraction.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00066 | $0.01989 |
| Opus 5 | $0.00033 | $0.00994 |
| Sonnet 5 | $0.00013 | $0.00398 |
| Haiku 4.5 | $0.00007 | $0.00199 |
Grade A, and why
parasitic-extraction 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 12d 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 — 212 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Parasitic Extraction
Invocation
- If invoked by a user presenting an extraction task: immediately spawn the
analog-chip-design-agents:parasitic-extraction-orchestratoragent and pass the full user request and any available context. Do not execute stages directly. - If invoked by the
parasitic-extraction-orchestratormid-flow: do not spawn a new agent. Treat this file as read-only — return the requested stage rules, sign-off criteria, or loop-back guidance.
Spawning the orchestrator from within an active orchestrator run causes recursive delegation and must never happen.
Pre-run Context
Before executing or advising on any stage, read the following if they exist:
memory/extraction/knowledge.md— known extraction-deck settings, coupling-net recipes, back-annotation pitfalls, PDK extraction quirks. Incorporate its guidance into every run.memory/extraction/run_state.md— current run identity for resume-after-interruption.
Purpose
Extract R, C, and coupling parasitics from a physically-clean layout and build a
back-annotated post-layout netlist for sign-off simulation. Five stages with explicit QoR
gates. Extraction is the bridge between a clean GDS and post-layout sign-off; it gates on the
pex_signoff checkpoint and flags layouts for parasitic reduction when degradation is large.
Supported EDA Tools
Open-Source
- Magic (
magic) —ext/ext2spiceRC extraction - KLayout (
klayout) — PEX (R + limited C) decks - FastCap / FastHenry (
fastcap,fasthenry) — field-solver capacitance/inductance for critical nets
Proprietary (detect-only — never installed)
- Synopsys StarRC (
starrc) — sign-off RC extraction - Cadence Quantus QRC (
quantus) - Siemens Calibre xRC / xACT (
calibre) - Silvaco Clever — 3-D field-solver extraction
Stage: extraction_setup
Domain Rules
- Configure the extraction deck for the target
constraints.pdkand the required extraction type (R-only, RC, or RC+coupling) based on the block's sensitivity. - Define the corner (best/worst-case parasitic) and the nets requiring coupling extraction (high-Z, matched, clock).
- Confirm the input GDS passed physical-verification (
design_state.physical_verification.signoff) before extracting.
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.
- 12d ago First seen · 212 lines · 66 tokens per session scan A 6712ee463460
parasitic-extraction is a skill published in the GitHub repository hdl-tools/analog-chip-design-agents (22 stars, last pushed 3mo ago), licensed MIT. It adds 66 tokens to every session and 1,989 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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