Free Public Library · Served over MCP · No API Key

The Public Library
Built for AI Agents.

184,000+ primary sources — peer-reviewed research from 50 top universities, digitized history from the New York Public Library, semiconductor manufacturing training, and arXiv preprints — searchable by any MCP-compatible agent. Free. Fully attributed. No authentication.

184,000+ Sources 140 Topic Sets Free No API Key
Connect in 60 Seconds → See What's Inside

One URL. Any Agent.

Works with a free Claude account. Any MCP-compatible agent — Claude, Gemini API, Ollama, or a custom framework — connects the same way. For browser chat, Claude.ai has native MCP connector support.
Step 1 Open Claude.ai Go to claude.ai and sign in. A free account works — no paid plan required.
Step 2 Settings → Connectors Click your profile icon → Customize → Connectors → click "+" → Add custom connector.
Step 3 Paste the endpoint Copy the URL below and paste it as the server endpoint. Click Save.
Step 4 Enable & open a new chat Enable library tools near the chat input, then open a new conversation. You're in.
https://library.publicmcp.org/mcp

What's in the Library

Seven collections, one search. Every item carries a source_url back to the originating institution — full primary source, fully attributed, ready for citation.

Collection Items Topic sets
OpenAlex peer-reviewed CS & engineering papers 165,876 60 sets — Machine Learning, AI, NLP, Computer Vision, Cybersecurity, Algorithms & more
NYPL digitized historical records 18,541 17 sets
American-history curated sets (via DPLA) 40 sets — Civil Rights, WWII, Women's Suffrage, Great Depression, Space Race & more
Semiconductor manufacturing training 224 7 curriculum sections
arXiv preprints 192 12 sets
Library of Congress (live search) 10 research sets
One Bite pizza reviews (demo dataset) 1,143 1 set — try search_pizza_reviews
Built on This Library

Semiconductor Manufacturing — The Free AI-Led Course →

MIT's 6.780 curriculum taught interactively by AI using the training collection above. Lectures, problem sets, and quizzes — no classroom, no tuition.

Why This Exists

Keeping Knowledge Open to AI

The web is quietly closing to AI. Bot-blocking, paywalls, and anti-crawling defaults mean a growing share of human knowledge returns a 403 when an AI agent asks for it — even when the content itself is public, open-access, or in the public domain. Every site that goes dark to agents makes AI answers a little worse for everyone.

This library is the opposite bet: primary sources — peer-reviewed research, digitized history, open training materials — deliberately kept reachable, structured, and attributed for any AI agent that asks. Not scraped content laundered from someone else's work, but open collections served with a source_url on every item, so the originating institution gets the credit and the reader gets the primary source.

Wikipedia became the open reference layer of the human web — free, cited, and built to be read by anyone. The AI-native web needs the same thing: a free, cited reference layer built to be queried by any agent. That's what this library is for.

The Tools

How Agents Query It

Search

search_library

Full-text BM25-ranked search across titles, abstracts, and document text — all 184,000+ items at once, or filtered by collection with source="micron-training".

Retrieve

fetch_library

Pull the full record for any item by ID — title, description, item type, institution, and the source_url for citation.

Browse

list_library_sets

Enumerate all 140 curated topic sets across every collection — the map of what the library holds, filterable by source.

Live Sources

search_nypl_live · search_loc_live

Query the New York Public Library and Library of Congress digital collections live — reaching beyond the indexed corpus to millions of additional records.

First Prompts

Once connected, paste any of these into a new conversation.

Search the library for recent papers on transformer attention mechanisms and summarize the three most relevant, with citations.
Use list_library_sets to show me every American-history topic set, then pull three primary sources on the Women's Suffrage movement.
Search the semiconductor training collection for an introduction to statistical process control and walk me through it.
FAQ

Common Questions

Is the library really free? What's the catch?

Free, no catch. No API key, no authentication, no rate limits on reads. The library is the open content layer of the PUBLICMCP standard — it exists so any agent can see what a public MCP server is capable of. If you find it useful, look at the business directory built on the same infrastructure.

Which agents can use it?

Any agent that speaks the Model Context Protocol: Claude (including free claude.ai accounts via Settings → Connectors), the Gemini API, Ollama, and custom agent frameworks. ChatGPT integrations can use the REST endpoint at /tools/{tool_name}.

Where does the content come from?

Open scholarly and cultural sources: OpenAlex (peer-reviewed papers from 50 top universities), the New York Public Library's digital collections, the Digital Public Library of America, the Library of Congress, arXiv, and curated open training materials from OSHA, SEMI, and Micron Technology. Every item links back to its originating institution.

Can my library or educational nonprofit get its own MCP server?

Yes — PUBLICMCP hosts MCP servers free for public libraries and educational nonprofits, on the same infrastructure that serves this library. Contact us through publicmcp.org.

All 128 topic sets

Every set has its own page with a sample of the collection and the MCP query to retrieve all of it. Agents: markdown index at /library/index.md.

SetSourceItems
Abolition and SlaveryDigital Public Library of Americalive
Abraham Lincoln — Life & LegacyDigital Public Library of Americalive
African American Visual Art & PhotographyDigital Public Library of Americalive
American Architecture & Historic BuildingsDigital Public Library of Americalive
American Education HistoryDigital Public Library of Americalive
American Folk Art & CraftsDigital Public Library of Americalive
American Inventors & InnovationDigital Public Library of Americalive
American Maritime & Naval HistoryDigital Public Library of Americalive
American Political Cartoons & SatireDigital Public Library of Americalive
American RevolutionDigital Public Library of Americalive
Civil Rights MovementDigital Public Library of Americalive
Conservation & the EnvironmentDigital Public Library of Americalive
Constitutional HistoryDigital Public Library of Americalive
Early American PhotographyDigital Public Library of Americalive
Early Aviation & FlightDigital Public Library of Americalive
Immigration to AmericaDigital Public Library of Americalive
Industrial Revolution in AmericaDigital Public Library of Americalive
Jazz & American MusicDigital Public Library of Americalive
Labor MovementDigital Public Library of Americalive
Lewis and Clark ExpeditionDigital Public Library of Americalive
Mexican-American History & CultureDigital Public Library of Americalive
National Parks & Natural HistoryDigital Public Library of Americalive
Native American HistoryDigital Public Library of Americalive
Prohibition & Temperance MovementDigital Public Library of Americalive
Public Health & Medicine in AmericaDigital Public Library of Americalive
Reconstruction EraDigital Public Library of Americalive
Spanish-American War & EmpireDigital Public Library of Americalive
The Civil WarDigital Public Library of Americalive
The Cold WarDigital Public Library of Americalive
The Great DepressionDigital Public Library of Americalive
The Harlem RenaissanceDigital Public Library of Americalive
The Korean WarDigital Public Library of Americalive
The New DealDigital Public Library of Americalive
The Space RaceDigital Public Library of Americalive
Vietnam WarDigital Public Library of Americalive
Westward ExpansionDigital Public Library of Americalive
Women's Labor & Professional LifeDigital Public Library of Americalive
Women's SuffrageDigital Public Library of Americalive
World War IDigital Public Library of Americalive
World War IIDigital Public Library of Americalive
Advertising & Business PromotionLibrary of Congresslive
Agricultural Economics & Farm PolicyLibrary of Congresslive
Banking & Federal ReserveLibrary of Congresslive
Business History & Corporate RecordsLibrary of Congresslive
Economic Statistics & Census ReportsLibrary of Congresslive
Great Depression & New Deal EconomicsLibrary of Congresslive
Industrial History & ManufacturingLibrary of Congresslive
International Trade & CommerceLibrary of Congresslive
Labor Economics & Trade UnionsLibrary of Congresslive
Wall Street & Securities MarketsLibrary of Congresslive
African American History & CultureNew York Public Library1,192
Architecture & Urban DesignNew York Public Library2,009
Commerce, Trade & BusinessNew York Public Library289
Harlem RenaissanceNew York Public Library1,089
Immigration & Ellis IslandNew York Public Library2,157
Jazz & American MusicNew York Public Library620
Maps & GeographyNew York Public Library2,902
New York City HistoryNew York Public Library141
Performing ArtsNew York Public Library1,766
PhotographyNew York Public Library943
Wall Street & Financial MarketsNew York Public Library4,460
World War I & World War IINew York Public Library973
Dave Portnoy's One Bite Pizza ReviewsOne Bite Pizza Reviews1,143
Algorithms & ComplexityOpenAlex76
Arizona State University — CS ResearchOpenAlex2,805
Artificial IntelligenceOpenAlex123
Boston University — CS ResearchOpenAlex1,414
CMU — CS ResearchOpenAlex4,876
CU Boulder — CS ResearchOpenAlex2,652
Columbia University — CS ResearchOpenAlex3,000
Computer Networks & Distributed SystemsOpenAlex120
Computer VisionOpenAlex180
Cornell University — CS ResearchOpenAlex3,974
CybersecurityOpenAlex217
Data Mining & DatabasesOpenAlex99
Duke University — CS ResearchOpenAlex1,585
ETH Zurich — CS ResearchOpenAlex2,861
Georgia Tech — CS ResearchOpenAlex8,096
Harvard University — CS ResearchOpenAlex2,601
Human-Computer InteractionOpenAlex182
Imperial College London — CS ResearchOpenAlex2,388
Johns Hopkins University — CS ResearchOpenAlex1,315
MIT — CS ResearchOpenAlex7,881
Machine LearningOpenAlex193
NC State — CS ResearchOpenAlex3,195
National University of Singapore — CS ResearchOpenAlex2,928
Natural Language ProcessingOpenAlex132
Northeastern University — CS ResearchOpenAlex1,724
Northwestern University — CS ResearchOpenAlex1,888
Ohio State University — CS ResearchOpenAlex2,412
Peking University — CS ResearchOpenAlex2,468
Penn State — CS ResearchOpenAlex2,846
Princeton University — CS ResearchOpenAlex2,681
Purdue University — CS ResearchOpenAlex7,483
Rice University — CS ResearchOpenAlex1,170
Rutgers University — CS ResearchOpenAlex2,056
Software EngineeringOpenAlex367
Stanford University — CS ResearchOpenAlex6,538
Stony Brook University — CS ResearchOpenAlex1,367
Tsinghua University — CS ResearchOpenAlex3,402
UC Berkeley — CS ResearchOpenAlex6,681
UC Davis — CS ResearchOpenAlex2,080
UC Irvine — CS ResearchOpenAlex2,042
UC San Diego — CS ResearchOpenAlex3,456
UC Santa Barbara — CS ResearchOpenAlex1,910
UCLA — CS ResearchOpenAlex3,802
UIUC — CS ResearchOpenAlex6,959
UMass Amherst — CS ResearchOpenAlex1,830
USC — CS ResearchOpenAlex3,494
UT Austin — CS ResearchOpenAlex5,780
UW Madison — CS ResearchOpenAlex4,573
University of Cambridge — CS ResearchOpenAlex2,074
University of Edinburgh — CS ResearchOpenAlex1,926
University of Maryland — CS ResearchOpenAlex2,205
University of Michigan — CS ResearchOpenAlex6,799
University of Minnesota — CS ResearchOpenAlex2,188
University of Oxford — CS ResearchOpenAlex1,826
University of Toronto — CS ResearchOpenAlex1,950
University of Virginia — CS ResearchOpenAlex2,160
University of Washington — CS ResearchOpenAlex4,840
University of Waterloo — CS ResearchOpenAlex2,745
Virginia Tech — CS ResearchOpenAlex3,430
Yale University — CS ResearchOpenAlex1,831
Astrophysics & CosmologyarXiv24
Climate Science & Earth SystemsarXiv31
Cryptography & SecurityarXiv15
Quantum Computing & Quantum PhysicsarXiv33
Robotics & Autonomous SystemsarXiv26