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 fmschulz/omics-skills --skill crossref-lookupgit clone --depth 1 https://github.com/fmschulz/omics-skillsWrote 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/fmschulz/omics-skills/crossref-lookup)<a href="https://agentmods.dev/skills/fmschulz/omics-skills/crossref-lookup"><img src="https://agentmods.dev/badge/skills/fmschulz/omics-skills/crossref-lookup.svg" alt="Measured on agentmods" height="20"></a>- 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 | $0.00031 | $0.01139 |
| Opus 5 | $0.00015 | $0.00570 |
| Sonnet 5 | $0.00006 | $0.00228 |
| Haiku 4.5 | $0.00003 | $0.00114 |
Grade A, and why
crossref-lookup 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 yesterday.
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 — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Crossref Lookup
Use this skill for citation metadata work backed by the Crossref REST API.
Instructions
- Prefer this skill when the user needs DOI validation, title search, citation metadata, or bibliography auditing.
- Use the bundled CLI:
- In this repository:
skills/crossref-lookup/scripts/lookup - After installation:
~/.agents/skills/crossref-lookup/scripts/lookup
- In this repository:
- Choose the narrowest mode that matches the request:
--doifor validating or enriching one DOI--titlefor title-to-DOI discovery--validate-filefor one DOI per line--audit-bibliographyfor a bibliography file such as.bibor plain text
- Normalize DOI strings before interpreting failures.
- Acceptable raw forms include
10.xxxx/...,doi:10.xxxx/..., andhttps://doi.org/10.xxxx/...
- Acceptable raw forms include
- If the user has a contact email for polite-pool requests, pass it with
--email. - Treat Crossref as citation metadata, not full text.
- If exact abstract-page wording, final pagination, or publisher formatting matters, verify the shortlisted record on the publisher or DOI landing page.
- When title search returns multiple plausible records, keep the ambiguity explicit instead of selecting a match silently.
- Use
--strictfor audits that must fail on malformed, missing, or unresolved records. Exit code 2 denotes a transient service/network failure; exit code 1 denotes invalid, missing, or other audit failures.
Quick Reference
| Task | Action |
|---|---|
| Validate DOI | skills/crossref-lookup/scripts/lookup --doi 10.1038/nature12373 |
| Search by title | skills/crossref-lookup/scripts/lookup --title "CRISPR-Cas9 genome editing" |
| Validate a DOI list | skills/crossref-lookup/scripts/lookup --validate-file dois.txt |
| Audit bibliography | skills/crossref-lookup/scripts/lookup --audit-bibliography refs.bib |
| Write to file | --output crossref-report.txt |
| Polite-pool email | --email [email protected] |
| Strict audit | --strict returns nonzero for unresolved records |
What ships with it
3 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.
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.
- yesterday Changed · -2 lines 275e3060c20e
- 7d ago First seen · 115 lines · 31 tokens per session scan A a272403d5e27
crossref-lookup is a skill published in the GitHub repository fmschulz/omics-skills (7 stars, last pushed yesterday), licensed MIT. It adds 31 tokens to every session and 1,139 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 2026-08-31.
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