paper-retriever

paper-retriever is a skill for Claude Code from ctoth/research-papers-plugin. It costs 88 tokens per session (2,391 once invoked), scanned A, original, no licence file.

A scientific-paper downloader that accepts an arXiv URL, DOI, or title and saves the PDF in the papers/ directory. It tries open-access sources before handing paywalled papers to another retrieval backend.

In plain words
What is it for?
Use it to collect papers from arXiv, publisher pages, Unpaywall, or open repositories, with separate backends for some paywalled papers.
Why use it?
It brings several ways to find a paper into one workflow instead of requiring separate searches and downloads.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter.

Part of the research-papers plugin — 28 skills shipped together

Good fit Use it to collect papers from arXiv, publisher pages, Unpaywall, or open repositories, with separate backends for some paywalled papers.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ctoth/research-papers-plugin/paper-retriever
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 ctoth/research-papers-plugin --skill paper-retriever
Clone the repo
git clone --depth 1 https://github.com/ctoth/research-papers-plugin

Made for: Claude Code.

Or install research-papers, the plugin that ships this one along with the rest of its 28 skills.

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 paper-retriever

README.md
[![agentmods](https://agentmods.dev/badge/skills/ctoth/research-papers-plugin/paper-retriever/github.svg)](https://agentmods.dev/skills/ctoth/research-papers-plugin/paper-retriever)
Your own site
<a href="https://agentmods.dev/skills/ctoth/research-papers-plugin/paper-retriever"><img src="https://agentmods.dev/badge/skills/ctoth/research-papers-plugin/paper-retriever/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 paper-retriever

Your own site · 80×15
<a href="https://agentmods.dev/skills/ctoth/research-papers-plugin/paper-retriever"><img src="https://agentmods.dev/badge/skills/ctoth/research-papers-plugin/paper-retriever.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 88 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,391 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00088 $0.02391
Opus 5.5 $0.00035 $0.00956
Sonnet 5.5 $0.00018 $0.00478
Haiku 4.5 $0.00009 $0.00239

Measured 1mo ago against content hash f6ce2e931f15, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

paper-retriever 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 1mo ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/emit_nested_retriever_fallback.py, scripts/fetch_paper.py, scripts/search_papers.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

mkdir -p "./papers/<dirname>" && curl -L -o "./papers/<dirname>/paper.pdf" "OPEN_ACCESS_URL"
plugins/research-papers/skills/paper-retriever/SKILL.md · 219 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

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.

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 · 219 lines · 88 tokens per session scan A f6ce2e931f15

Subscribe to this mod's changes

paper-retriever is a skill published in the GitHub repository ctoth/research-papers-plugin (33 stars, last pushed 4d ago), with no licence file. It adds 88 tokens to every session and 2,391 once invoked, about $0.0004 per session on Opus 5.5. 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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