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/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/fmschulz/omics-skills/crossref-lookup"><img src="https://agentmods.dev/badge/skills/fmschulz/omics-skills/crossref-lookup.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00037 | $0.01118 |
| Opus 5.5 | $0.00015 | $0.00447 |
| Sonnet 5.5 | $0.00007 | $0.00224 |
| Haiku 4.5 | $0.00004 | $0.00112 |
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 22d 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 — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Crossref Lookup
Validate DOIs, find DOIs from titles, and audit bibliographies against the Crossref REST API.
Instructions
- Run the bundled CLI,
scripts/lookup. Paths below are relative to this skill's directory, installed at~/.agents/skills/crossref-lookup. - Choose the narrowest mode:
--doivalidates or enriches one DOI.--titlereturns ranked DOI candidates for a title (--rows, default 5).--validate-filechecks one DOI per line.--audit-bibliographyextracts DOIs from a.bibor plain-text file and checks each one.
- DOI inputs are normalized before lookup.
10.xxxx/...,doi:10.xxxx/..., andhttps://doi.org/10.xxxx/...are all accepted, and trailing BibTeX punctuation is removed. - Pass
--emailonly with an address the user gave for Crossref's polite pool. Never take an address from the conversation, git config, or system context; without one the CLI uses the public pool. The CLI spaces requests to stay within the limits Crossref reported on 2026-10-01: single-DOI lookups at 5 per second (10 with--email), title searches at 1 per second (3 with--email). - When a title search returns several plausible records, show the candidates instead of choosing one silently.
- Crossref holds citation metadata, not full text. When exact wording, pagination, or publisher formatting matters, check the DOI landing page.
- Use
--strictfor audits that must fail on any invalid, missing, or unresolved record.
Quick Reference
| Task | Command |
|---|---|
| Validate a DOI | scripts/lookup --doi 10.1038/nature12373 |
| Search by title | scripts/lookup --title "CRISPR-Cas9 genome editing" --rows 5 |
| Validate a DOI list | scripts/lookup --validate-file dois.txt |
| Audit a bibliography | scripts/lookup --audit-bibliography refs.bib |
| Write the report to a file | --output crossref-report.json (refuses to overwrite) |
| Polite pool | --email [email protected] |
| Fail on any unresolved record | --strict |
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.
- 22d ago Changed 7a410d49f4a7
- 23d ago Changed · -27 lines · +6 tokens per session cd968201ec61
- 1mo ago Changed · -2 lines 275e3060c20e
- 1mo 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 (11 stars, last pushed 23d ago), licensed MIT. It adds 37 tokens to every session and 1,118 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 2026-08-31.
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