Agent skill

Pmc Oai API

by wentorai in wentorai/research-plugins

PubMed Central OAI-PMH metadata harvesting. An agent skill from wentorai/research-plugins.

Install Pmc Oai API

skills CLI

$ npx skills add wentorai/research-plugins --skill pmc-oai-api -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install wentorai/research-plugins pmc-oai-api --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/wentorai/research-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/literature/fulltext/pmc-oai-api .claude/skills/pmc-oai-api && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "pmc-oai-api" agent skill from https://github.com/wentorai/research-plugins/tree/main/skills/literature/fulltext/pmc-oai-api into .claude/skills/pmc-oai-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pmc-oai-api", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/wentorai/research-plugins/tree/main/skills/literature/fulltext/pmc-oai-api

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add wentorai/research-plugins --skill pmc-oai-api -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install wentorai/research-plugins pmc-oai-api --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/wentorai/research-plugins.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/literature/fulltext/pmc-oai-api .agents/skills/pmc-oai-api && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "pmc-oai-api" agent skill from https://github.com/wentorai/research-plugins/tree/main/skills/literature/fulltext/pmc-oai-api into .agents/skills/pmc-oai-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pmc-oai-api", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add wentorai/research-plugins --skill pmc-oai-api -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install wentorai/research-plugins pmc-oai-api --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/wentorai/research-plugins.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/literature/fulltext/pmc-oai-api .cursor/skills/pmc-oai-api && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "pmc-oai-api" agent skill from https://github.com/wentorai/research-plugins/tree/main/skills/literature/fulltext/pmc-oai-api into .cursor/skills/pmc-oai-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pmc-oai-api", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/wentorai/research-plugins.git --path skills/literature/fulltext/pmc-oai-api

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add wentorai/research-plugins --skill pmc-oai-api -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install wentorai/research-plugins pmc-oai-api --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/wentorai/research-plugins.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/literature/fulltext/pmc-oai-api .gemini/skills/pmc-oai-api && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "pmc-oai-api" agent skill from https://github.com/wentorai/research-plugins/tree/main/skills/literature/fulltext/pmc-oai-api into .gemini/skills/pmc-oai-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pmc-oai-api", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install wentorai/research-plugins pmc-oai-api

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add wentorai/research-plugins --skill pmc-oai-api -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/wentorai/research-plugins.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/literature/fulltext/pmc-oai-api .github/skills/pmc-oai-api && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "pmc-oai-api" agent skill from https://github.com/wentorai/research-plugins/tree/main/skills/literature/fulltext/pmc-oai-api into .github/skills/pmc-oai-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pmc-oai-api", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add wentorai/research-plugins --skill pmc-oai-api -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install wentorai/research-plugins pmc-oai-api --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/wentorai/research-plugins.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/literature/fulltext/pmc-oai-api .opencode/skills/pmc-oai-api && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "pmc-oai-api" agent skill from https://github.com/wentorai/research-plugins/tree/main/skills/literature/fulltext/pmc-oai-api into .opencode/skills/pmc-oai-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pmc-oai-api", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: pmc-oai-api
GitHub stars: 298
Used in: 1 other repo
Token cost: ~2.1k tokens
SKILL.md length: 650 words
Files: 1
Skills in repo: 405
Repo updated: Jun 19, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

PubMed Central OAI-PMH metadata harvesting. An agent skill from wentorai/research-plugins.

Research & Science work in your project
SKILL.md covers Overview, Authentication, Core Endpoints and Rate Limits, plus 2 more sections
Calls curl; reaches pmc.ncbi.nlm.nih.gov and openarchives.org

What it does

Pmc Oai API is an agent skill from wentorai/research-plugins. PubMed Central OAI-PMH metadata harvesting

Its SKILL.md is about 2.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Research & Science. It works with PubMed. The repository describes itself as: 350+ academic research skills, MCP configs, and plugins for Research-Claw and AI agents. The licence is MIT.

When your agent uses it

Research & Science work in your project

Example prompts

“/pmc-oai-api”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit bf44b3c. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- curl
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- pmc.ncbi.nlm.nih.gov
- openarchives.org
- purl.org
Also links to:
- ncbi.nlm.nih.gov
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Pmc Oai API loads about 2.1k tokens when it runs. Until then it costs about 14 tokens; SKILL.md has 650 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~14
When it runs · the whole SKILL.md, loaded when a task matches: ~2.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from wentorai/research-plugins at commit bf44b3c, republished under its MIT licence (© wentorai). 650 words, ~2,130 tokens.

Download SKILL.mdSave it as .claude/skills/pmc-oai-api/SKILL.md (or your agent's skills folder).

name: pmc-oai-api
description: PubMed Central OAI-PMH metadata harvesting

PMC-OAI API Guide

Overview

PubMed Central (PMC) is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM). The PMC OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) service provides a standardized interface for systematically harvesting metadata and full-text content from the PMC archive.

The OAI-PMH protocol is an internationally recognized standard for metadata harvesting, widely used by libraries, repositories, and research infrastructure. The PMC implementation allows researchers to programmatically discover and retrieve article metadata, including titles, authors, abstracts, MeSH terms, publication dates, and links to full-text XML and PDF versions. This is particularly valuable for building local search indexes, systematic review pipelines, and text mining corpora.

Biomedical researchers, systematic reviewers, bioinformaticians, medical librarians, and text mining specialists use the PMC OAI-PMH service to harvest large collections of open-access biomedical literature for meta-analyses, natural language processing research, knowledge graph construction, and institutional repository enrichment. PMC contains over 9 million full-text articles, making it one of the largest open-access biomedical literature collections in the world.

Authentication

No authentication required. The PMC OAI-PMH service is freely accessible without any API key, token, or registration. All requests are made via standard HTTP GET requests. However, users must comply with NCBI usage guidelines and respect the rate limits to ensure fair access for all users.

Core Endpoints

ListRecords: Harvest Article Metadata

Retrieve metadata records from PMC in bulk, with optional filtering by date range and metadata set. This is the primary endpoint for systematic metadata harvesting.

URL: GET https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/
Parameters:

Parameter	Type	Required	Description
verb	string	Yes	Must be `ListRecords`
metadataPrefix	string	Yes	Metadata format: `oai_dc`, `pmc`, or `pmc_fm`
set	string	No	Filter by set (e.g., journal, open access subset)
from	string	No	Start date for selective harvesting (YYYY-MM-DD)
until	string	No	End date for selective harvesting (YYYY-MM-DD)
resumptionToken	string	No	Token for paginating through large result sets

Example:

bash

# Harvest recent open-access records in Dublin Core format
curl "https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/?verb=ListRecords&metadataPrefix=oai_dc&from=2024-06-01&until=2024-06-07"

# Harvest PMC full metadata format
curl "https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/?verb=ListRecords&metadataPrefix=pmc_fm&from=2024-06-01&until=2024-06-02"

Response: Returns XML containing <record> elements, each with <header> (identifier, datestamp, setSpec) and <metadata> (article title, creators, subjects, description, date, identifiers, rights). Includes a <resumptionToken> for fetching subsequent pages.

GetRecord: Retrieve a Single Record

Fetch the complete metadata record for a specific PMC article by its OAI identifier.

URL: GET https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/
Parameters:

Parameter	Type	Required	Description
verb	string	Yes	Must be `GetRecord`
identifier	string	Yes	OAI identifier (e.g., `oai:pubmedcentral.nih.gov:1234567`)
metadataPrefix	string	Yes	Metadata format: `oai_dc`, `pmc`, or `pmc_fm`

Example:

bash

curl "https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/?verb=GetRecord&identifier=oai:pubmedcentral.nih.gov:7096803&metadataPrefix=oai_dc"

Response: Returns a single <record> element with full metadata in the requested format, including article title, all authors, abstract, journal information, publication date, DOI, PMID, and subject classifications.

Show full SKILL.md (225 more words)Show less

ListSets: Discover Available Sets

Retrieve the list of available sets (collections) that can be used to filter records during harvesting. Sets typically correspond to journals, open-access subsets, or subject categories.

URL: GET https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/
Parameters:

Parameter	Type	Required	Description
verb	string	Yes	Must be `ListSets`

Example:

bash

curl "https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/?verb=ListSets"

Response: Returns XML with <set> elements containing <setSpec> (machine-readable identifier) and <setName> (human-readable name) for each available collection.

Rate Limits

The PMC OAI-PMH service enforces a rate limit of 3 requests per second. Exceeding this limit may result in temporary IP blocking. NCBI requires users to make no more than 3 requests per second across all NCBI E-utilities and OAI services combined. For bulk harvesting, implement appropriate delays between requests and use the resumptionToken for pagination rather than making parallel requests.

NCBI also requests that users identify themselves by including an email address in the HTTP request headers or by registering for an NCBI API key (which allows up to 10 requests per second).

Common Patterns

Incremental Metadata Harvesting

Harvest new records added since your last sync using date-based selective harvesting:

python

import requests
import xml.etree.ElementTree as ET
import time

base_url = "https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/"
params = {
    "verb": "ListRecords",
    "metadataPrefix": "oai_dc",
    "from": "2024-06-01",
    "until": "2024-06-07"
}

all_records = []
while True:
    resp = requests.get(base_url, params=params)
    root = ET.fromstring(resp.text)
    ns = {"oai": "http://www.openarchives.org/OAI/2.0/"}

    records = root.findall(".//oai:record", ns)
    all_records.extend(records)

    token_elem = root.find(".//oai:resumptionToken", ns)
    if token_elem is not None and token_elem.text:
        params = {"verb": "ListRecords", "resumptionToken": token_elem.text}
        time.sleep(0.5)  # Respect rate limits
    else:
        break

print(f"Harvested {len(all_records)} records")

Build a Local Search Index

Extract structured metadata from harvested records for indexing:

python

import requests
import xml.etree.ElementTree as ET

url = "https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/"
params = {
    "verb": "GetRecord",
    "identifier": "oai:pubmedcentral.nih.gov:7096803",
    "metadataPrefix": "oai_dc"
}

resp = requests.get(url, params=params)
root = ET.fromstring(resp.text)

dc_ns = "http://purl.org/dc/elements/1.1/"
oai_ns = "http://www.openarchives.org/OAI/2.0/"

metadata = root.find(f".//{{{oai_ns}}}metadata")
if metadata is not None:
    title = metadata.find(f".//{{{dc_ns}}}title")
    creators = metadata.findall(f".//{{{dc_ns}}}creator")
    print(f"Title: {title.text if title is not None else 'N/A'}")
    print(f"Authors: {', '.join(c.text for c in creators)}")

Discover Available Journal Sets

List all available journal sets to target specific journal harvesting:

bash

curl "https://pmc.ncbi.nlm.nih.gov/api/oai/v1/mh/?verb=ListSets" | head -100

References

Official PMC OAI documentation: https://pmc.ncbi.nlm.nih.gov/tools/oai/
PMC homepage: https://pmc.ncbi.nlm.nih.gov/
OAI-PMH protocol specification: https://www.openarchives.org/OAI/openarchivesprotocol.html
NCBI usage guidelines: https://www.ncbi.nlm.nih.gov/home/about/policies/
PMC Open Access subset: https://pmc.ncbi.nlm.nih.gov/tools/openftlist/

Files

Just SKILL.md in skills/literature/fulltext/pmc-oai-api of wentorai/research-plugins.

Open the folder on GitHubat commit bf44b3c

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in wentorai/research-plugins, which our catalogue first saw on October 7, 2026.

brycewang-stanford/Auto-Empirical-Research-Skillsskills/43-wentorai-research-plugins/skills/literature/fulltext/pmc-oai-api

Compare with similar skills

Pmc Oai API next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Pmc Oai API compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Pmc Oai API this skillwentorai/research-plugins	298	1 repos	~2.1k	Automated safety check: Pass	MIT	3 mo ago
Systematic Review ScreenerImbad0202/academic-research-skills	51k	—	~8.4k	Automated safety check: Pass	Custom licence	yesterday
Literature Reviewneflibata-feng/MyArxiv-Agent	126	20 repos	~5.9k	Automated safety check: Notes	MIT	yesterday
Citation ManagementK-Dense-AI/claude-scientific-writer	2.4k	2 repos	~3.9k	Automated safety check: Notes	MIT	yesterday
Citation Managementneflibata-feng/MyArxiv-Agent	126	19 repos	~8.1k	Automated safety check: Notes	MIT	yesterday
Paper Searchopenags/paper-search-mcp	2.8k	—	~1.2k	Automated safety check: Notes	MIT	8 days ago

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Questions about Pmc Oai API

What does Pmc Oai API do?

PubMed Central OAI-PMH metadata harvesting. An agent skill from wentorai/research-plugins. Pmc Oai API is an agent skill from wentorai/research-plugins.

When should I use Pmc Oai API?

Pmc Oai API fits situations like: research & Science work in your project.

How do I install Pmc Oai API in Claude Code?

Run `npx skills add wentorai/research-plugins --skill pmc-oai-api -a claude-code`. Or copy the skill folder (skills/literature/fulltext/pmc-oai-api in wentorai/research-plugins) into .claude/skills/pmc-oai-api in your project. Claude Code loads it when a task matches its description.

How do I install Pmc Oai API in Codex?

Run `npx skills add wentorai/research-plugins --skill pmc-oai-api -a codex`. Or copy the skill folder (skills/literature/fulltext/pmc-oai-api in wentorai/research-plugins) into .agents/skills/pmc-oai-api in your project. Codex loads it when a task matches its description.

Can I use Pmc Oai API in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add wentorai/research-plugins --skill pmc-oai-api -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/pmc-oai-api, .gemini/skills/pmc-oai-api, .github/skills/pmc-oai-api and .opencode/skills/pmc-oai-api in your project.

What does Pmc Oai API need to run?

Going by SKILL.md and its folder, Pmc Oai API needs the command-line tools its instructions call (curl). Our summary lists: Python 3.

Does Pmc Oai API access the network?

SKILL.md names 4 domains. In commands or code: pmc.ncbi.nlm.nih.gov, openarchives.org and purl.org; the agent is likely to contact these when it follows the instructions. As links in the text: ncbi.nlm.nih.gov. This is read from the text; nothing was executed.

Is Pmc Oai API safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Pmc Oai API use?

Pmc Oai API is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Pmc Oai API use?

About 2.1k tokens (SKILL.md is roughly 8.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Pmc Oai API?

Skills that share tags, products or a category with Pmc Oai API: Systematic Review Screener (Imbad0202/academic-research-skills, 51k stars), Literature Review (neflibata-feng/MyArxiv-Agent, 126 stars), Citation Management (K-Dense-AI/claude-scientific-writer, 2.4k stars) and Citation Management (neflibata-feng/MyArxiv-Agent, 126 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Pmc Oai API?

wentorai (a GitHub user) maintains it in wentorai/research-plugins, which has 298 GitHub stars. The repository holds 405 skills in this directory. The repository was last updated on June 19, 2026.

Source: wentorai/research-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Pmc Oai API

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

PMC-OAI API Guide

Overview

Authentication

Core Endpoints

ListRecords: Harvest Article Metadata

GetRecord: Retrieve a Single Record

ListSets: Discover Available Sets

Rate Limits

Common Patterns

Incremental Metadata Harvesting

Build a Local Search Index

Discover Available Journal Sets

References

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from wentorai/research-plugins

Related

Questions about Pmc Oai API