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 diodeinc/pcb --skill librariangit clone --depth 1 https://github.com/diodeinc/pcbWrote 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/diodeinc/pcb/librarian)<a href="https://agentmods.dev/skills/diodeinc/pcb/librarian"><img src="https://agentmods.dev/badge/skills/diodeinc/pcb/librarian/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/diodeinc/pcb/librarian"><img src="https://agentmods.dev/badge/skills/diodeinc/pcb/librarian.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00017 | $0.01128 |
| Opus 5.5 | $0.00007 | $0.00451 |
| Sonnet 5.5 | $0.00003 | $0.00226 |
| Haiku 4.5 | $0.00002 | $0.00113 |
Grade A, and why
librarian 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 7d 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 — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Librarian
Create sourceable, evidence-backed packages that board designers can search
and instantiate. Work in the current registry; dispatch another librarian
only when the user asks. Use the artifact skills as needed: kicad-symbol,
kicad-footprint, zener-language, and module-layout.
Package scope
Search the registry before creating a package.
Inspect and extend a suitable existing package, including published results.
Group a family when it shares footprint, pinout, feature set, and fundamental
schematic topology. Use separate packages when those contracts differ. For a
new package, establish its final directory and pcb.toml before authoring so
its evolving content is discoverable.
Keep simple parts such as connectors and passives primitive unless user requirements or manufacturer guidance establish an application circuit. An unspecified request for a reference design does not justify inventing board wiring, protection, passive values, or a layout. Include datasheet-required or strongly recommended support circuitry when warranted by the requested package; respect a primitive-only request.
Curate the relevant symbols, footprints, and pin maps before building circuitry on them. Do not invent datasheet facts, limits, or sourcing claims. Focused repairs need only the relevant curation stages. Keep the datasheet URL in metadata; do not check downloaded PDFs into the package.
Curate symbols, footprints, and models
- Functional silicon variants need distinct symbols; ordering-only variants such as tape/reel, temperature grade, or RoHS suffixes do not.
- An MPN match or resemblance to a reference footprint does not establish footprint correctness. Requested creation or repair includes replacing an incorrect candidate or generating one from authoritative evidence; ask only if required geometry remains unresolved. Review-only work produces findings.
- For an accepted footprint, set
Datasheetto the authoritative geometry source andDescriptionto its package and evidence basis. - Embed a verified STEP for the exact package, or make its absence and impact explicit. A known-wrong model is not an acceptable substitute.
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.
- 7d ago Changed · -1 lines 409fc996861f
- 12d ago Changed · -5 lines 61ffd188369f
- 17d ago Changed · -53 lines 18cfcb125208
- 23d ago Changed · -3 lines fb1d0a2ff79b
- 26d ago Changed · -1 lines 19d9b4f08061
- 1mo ago Changed 9c41a00fa7c5
- 1mo ago Changed · -158 lines · -58 tokens per session 0791b6a399f4
- 1mo ago Changed · +2 lines 3920965dc483
- 1mo ago Changed · +2 lines 2bb311db6677
- 1mo ago First seen · 324 lines · 75 tokens per session scan A 8e2f2a5f439f
librarian is a skill published in the GitHub repository diodeinc/pcb (465 stars, last pushed today), licensed MIT. It adds 17 tokens to every session and 1,128 once invoked, about $0.0001 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 2026-08-30.
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