citation-verifier

citation-verifier is a skill for Claude Code from papersflow-ai/papersflow-skills. It costs 48 tokens per session (555 once invoked), scanned A, original, MIT.

A paper-reference checker that verifies and standardizes identifiers such as DOIs, arXiv IDs, PubMed IDs, URLs, citation text, or paper titles.

In plain words
What is it for?
Use it to check a citation, retrieve the matching paper details, and see its title, authors, year, publication venue, DOI, and other identifiers.
Why use it?
It helps catch incorrect or incomplete references and turns different citation formats into one clear paper record.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the papersflow-skills plugin — 4 skills, 1 MCP server shipped together

Good fit Use it to check a citation, retrieve the matching paper details, and see its title, authors, year, publication venue, DOI, and other identifiers.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/papersflow-ai/papersflow-skills/citation-verifier
Install

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.

Any agent
npx skills add papersflow-ai/papersflow-skills --skill citation-verifier
Clone the repo
git clone --depth 1 https://github.com/papersflow-ai/papersflow-skills

Made for: Claude Code.

Or install papersflow-skills, the plugin that ships this one along with the rest of its 4 skills, 1 MCP server.

Wrote 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.

agentmods badge for citation-verifier

README.md
[![agentmods](https://agentmods.dev/badge/skills/papersflow-ai/papersflow-skills/citation-verifier/github.svg)](https://agentmods.dev/skills/papersflow-ai/papersflow-skills/citation-verifier)
Your own site
<a href="https://agentmods.dev/skills/papersflow-ai/papersflow-skills/citation-verifier"><img src="https://agentmods.dev/badge/skills/papersflow-ai/papersflow-skills/citation-verifier/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.

agentmods 80×15 button for citation-verifier

Your own site · 80×15
<a href="https://agentmods.dev/skills/papersflow-ai/papersflow-skills/citation-verifier"><img src="https://agentmods.dev/badge/skills/papersflow-ai/papersflow-skills/citation-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 555 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00048 $0.00555
Opus 5.5 $0.00019 $0.00222
Sonnet 5.5 $0.00010 $0.00111
Haiku 4.5 $0.00005 $0.00056

Measured 1mo ago against content hash a3610d48bafa, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

citation-verifier 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 1mo 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.

skills/citation-verifier/SKILL.md · 59 lines

What it actually says

Citation Verifier

Use this skill when the user wants to quickly verify or normalize a single paper reference rather than run a full literature search.

Workflow

  1. Accept whatever the user provides: DOI, URL, arXiv ID, PubMed ID, citation string, or a partial title.
  2. Call verify_citation with the raw input.
  3. If verification succeeds, call fetch with the resolved identifier to get the full paper record.
  4. Present the normalized result.

Output Style

Return a clean, structured card with:

  • Title — full paper title
  • Authors — first three authors, et al. if more
  • Year — publication year
  • Venue — journal or conference
  • DOI — canonical DOI if available
  • Identifiers — any additional IDs (arXiv, PubMed, Semantic Scholar)
  • Status — whether the citation was verified successfully or had issues

If verification fails or is ambiguous, say so clearly and suggest what the user can try (e.g., a more complete title, a different identifier).

Tool Guidance

Use verify_citation

Always call this first. It handles:

  • DOI strings (with or without resolver prefix)
  • arXiv IDs (e.g., 2301.12345, arXiv:2301.12345)
  • PubMed IDs
  • full or partial URLs from publisher sites, Semantic Scholar, Google Scholar
  • free-text citation strings (e.g., "Smith et al. 2020, Neural networks for...")

Use fetch

Call after successful verification to hydrate the full paper record with abstract, citation count, and venue details.

Do NOT use

  • search_literature — this skill is for a known reference, not topic discovery
  • get_citation_graph — the user wants verification, not graph exploration

Examples

  • User pastes: 10.1038/s41586-021-03819-2
  • User pastes: https://arxiv.org/abs/2301.12345
  • User says: "Check this cite: Vaswani et al., Attention Is All You Need, NeurIPS 2017"
  • User says: "Is this DOI valid? 10.1234/fake.doi.000"
  • User pastes a Semantic Scholar or Google Scholar URL
Changes

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.

  1. 1mo ago First seen · 59 lines · 48 tokens per session scan A a3610d48bafa

Subscribe to this mod's changes

citation-verifier is a skill published in the GitHub repository papersflow-ai/papersflow-skills (5 stars, last pushed 7mo ago), licensed MIT. It adds 48 tokens to every session and 555 once invoked, about $0.0002 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.