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Claude retrieves open-access full text without credentials. Add publisher keys or your library’s proxy in Settings > Credentials, under Literature access, to reach paywalled text you’re entitled to. No key bypasses a paywall. Given a DOI or title, Claude tries in order: open-access copy (Unpaywall, Semantic Scholar, PubMed Central), publisher routes you hold keys for, your library proxy, then the publisher page. Retrieved files (PDF, XML, or text) are saved into the session.

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Available credentials

CredentialEffect
Elsevier API key + institutional tokenEnables the Elsevier route (subscription still required)
Springer Nature API keyEnables the Springer Nature route
Semantic Scholar API keySpeeds the Semantic Scholar step
NCBI API keyRaises PubMed rate limit from 3 to 10 requests per second
Institutional EZproxy URL + session cookieRetries publisher links through your library
NCBI, EBI, and OurResearch (Unpaywall) ask callers to provide a contact email. The first time this applies, a Share a contact email with research data services? card appears. Sharing an email enables the Unpaywall step. You can also set this in Settings > General > Contact email. Claude paces requests to each provider at one per second, backs off when asked, and identifies itself in every request. Paywalled HTML isn’t scraped.