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 agentmods add skills/diodeinc/pcb/librariannpx 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.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 | $0.00075 | $0.04855 |
| Opus 5 | $0.00037 | $0.02427 |
| Sonnet 5 | $0.00015 | $0.00971 |
| Haiku 4.5 | $0.00007 | $0.00485 |
Grade A, and why
librarian scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fL "$(jq -er '.cse.symbol_url' "$assets_json")" \ How it starts
The opening of the file, as written. The whole thing — 324 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Librarian
Create sourceable, evidence-backed registry packages that board designers can search, trust, and instantiate.
Use this for new registry components, package fixes, family selectors, symbol/footprint cleanup, datasheet-backed reference circuitry, and requests produced by registry search during board work.
If you are already operating inside a registry checkout or remote librarian session, continue authoring in that registry unless the user explicitly asks you to dispatch another librarian. Remote librarian dispatch is for agents working outside the registry, such as board or spec work that discovers missing reusable content.
Guardrails
- Do not invent datasheet facts, pin mappings, footprints, passive values, limits, sourceability, or application topology. Find evidence or ask.
- Do not build reusable circuitry on untrusted symbols, footprints, or pin maps. Curate artifacts against the manufacturer datasheet first.
- Do not manually create scratch footprints or synthetic 3D models without explicit user confirmation. “Add a footprint/model” means find, verify, and embed trusted artifacts first. When no provider or library footprint exists for the part, generate one from the manufacturer datasheet with the
kicad-footprintskill; if the datasheet cannot establish the geometry, stop and ask. - Do not add new packages under
reference/; that tree is deprecated. A component's reference design belongs inside the component package. Prefer one.zenfile per reference design: instantiateComponent()directly in that file with its support circuitry, not through a separate primitive-only local wrapper. Usemodules/for higher-level reusable functional blocks and subsystem schematics that are not simply one component's reference design. - Treat registry packages as public integration contracts. If existing consumers must change Zener, layout, or assumptions to adopt the new version, it is breaking; obvious examples include
io()/config()/entrypoint changes and substantial layout changes. Note the migration and mark the commit accordingly.
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.
- 4d ago First seen · 324 lines · 75 tokens per session scan A 8e2f2a5f439f
librarian is a skill published in the GitHub repository diodeinc/pcb (434 stars, last pushed 4d ago), licensed MIT. It adds 75 tokens to every session and 4,855 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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