crossref-mcp-server

io.github.cyanheads/crossref-mcp-serverVersion 0.5.3

Resolve DOIs, search ~188M scholarly works, and fetch references via the Crossref REST API.

Status

Responds534 msNov 14, 2026, 14:48 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:48 UTC
Latency: 534 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 21:12 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://crossref.caseyjhand.com/mcpResponds534 msNov 14, 2026, 14:48 UTC

No sign-in

Claude Code

claude mcp add --transport http crossref-mcp-server https://crossref.caseyjhand.com/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: crossref-mcp-server
Remote MCP server URL: https://crossref.caseyjhand.com/mcp

Cursor

{
  "mcpServers": {
    "crossref-mcp-server": {
      "url": "https://crossref.caseyjhand.com/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"crossref-mcp-server","type":"http","url":"https://crossref.caseyjhand.com/mcp"}'

Streamable HTTP

npm: @cyanheads/crossref-mcp-server 0.5.3

Package only

npm (npx)

claude mcp add crossref-mcp-server -- npx -y @cyanheads/crossref-mcp-server@0.5.3

Streamable HTTP

npm: @cyanheads/crossref-mcp-server 0.5.3

Package only

npm (npx)

claude mcp add crossref-mcp-server -- npx -y @cyanheads/crossref-mcp-server@0.5.3

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Tools

7 tools

Tools of crossref-mcp-server
	Description		Read-only	Idempotent	Open world
`crossref_get_member`Resolves a Crossref member ID to its publisher/organization record: primary name, alternate imprint names, owned DOI prefixes, registered DOI counts, a per-work-type breakdown, and per-category metadata deposit coverage. Members are the organizations that register DOIs with Crossref, so this answers "what does this publisher publish, and how completely do they deposit metadata?" The member that holds a DOI now is the memberId crossref_get_work or crossref_search_works returns for it — pass that ID here. crossref_get_prefix returns the member a DOI prefix record names, the prefix's registrant, which for a transferred title is a former publisher rather than the DOI's current one.	Resolves a Crossref member ID to its publisher/organization record: primary name, alternate imprint names, owned DOI prefixes, registered DOI counts, a per-work-type breakdown, and per-category metadata deposit coverage. Members are the organizations that register DOIs with Crossref, so this answers "what does this publisher publish, and how completely do they deposit metadata?" The member that holds a DOI now is the memberId crossref_get_work or crossref_search_works returns for it — pass that ID here. crossref_get_prefix returns the member a DOI prefix record names, the prefix's registrant, which for a transferred title is a former publisher rather than the DOI's current one.	Not declared	Yes	Yes	Not declared
`crossref_get_prefix`Resolves a DOI prefix — the registrant portion of a DOI, e.g. "10.1038" — to the Crossref member its prefix record names: the publisher name and numeric member ID. That member is the prefix's registrant, so for a title transferred to another publisher it is not the member holding the DOI now — crossref_get_work's memberId names that one. The Crossref prefix record carries only these three facts (no counts, coverage, or flags); the returned memberId chains directly into crossref_get_member for the full publisher record.	Resolves a DOI prefix — the registrant portion of a DOI, e.g. "10.1038" — to the Crossref member its prefix record names: the publisher name and numeric member ID. That member is the prefix's registrant, so for a title transferred to another publisher it is not the member holding the DOI now — crossref_get_work's memberId names that one. The Crossref prefix record carries only these three facts (no counts, coverage, or flags); the returned memberId chains directly into crossref_get_member for the full publisher record.	Not declared	Yes	Yes	Not declared
`crossref_get_references`Returns the outgoing reference list for a DOI — the works cited by this paper. Each reference includes the deposited citation string and, where Crossref has resolved it, a DOI you can look up with crossref_get_work. Results are paged: referenceCount is the full deposited total, and when more remain the response carries a nextOffset to pass back as offset. Reference list coverage varies by publisher; many older works and non-participating publishers have no indexed references. Incoming citations — the works that cite this paper — are not available through Crossref; use OpenAlex for that.	Returns the outgoing reference list for a DOI — the works cited by this paper. Each reference includes the deposited citation string and, where Crossref has resolved it, a DOI you can look up with crossref_get_work. Results are paged: referenceCount is the full deposited total, and when more remain the response carries a nextOffset to pass back as offset. Reference list coverage varies by publisher; many older works and non-participating publishers have no indexed references. Incoming citations — the works that cite this paper — are not available through Crossref; use OpenAlex for that.	Not declared	Yes	Yes	Not declared
`crossref_get_work`Resolves a DOI to its full Crossref metadata record: title, authors, editors, affiliations, abstract (when deposited), journal or container with the volume, issue, pages, and article number that locate the work in it, ISSNs and ISBNs, publication date, type, license, full-text links, and funder acknowledgements. Where the record deposits them it also carries the conference event of a proceedings paper (event), the approval date that dissertations and most standards deposit in place of a publication date (approved, never read into published), the institutions a record names (the awarding institution of a thesis, the server of a preprint, the laboratories behind a report) and the degree of a thesis, and the subtype and group title of posted content such as a preprint. The author list is paged: authorCount is the full deposited total, offset and limit select the page (25 authors by default), and when authors remain the response carries a nextOffset to pass back as offset — large-collaboration papers deposit thousands. Post-publication updates are relayed as Crossref records them: updatedBy names each correction, retraction, expression of concern, or new version issued against this work, with its notice DOI and whether the publisher or Retraction Watch recorded it, and updateTo names the works this record is itself a notice for. An absent updatedBy does not mean the work was never updated — coverage depends on those deposits. relations lists related identifiers, such as a preprint and its published version, grouped by relation type; only the Crossref-registered DOIs among them resolve through crossref_get_work. memberId is the Crossref member that holds the DOI now — pass it to crossref_get_member for the publisher record and its deposit coverage; the prefix of the DOI names the member that registered the prefix, which for a transferred title is a former publisher. Outgoing references are reported as a count in referencesCount; the reference entries themselves come from	Resolves a DOI to its full Crossref metadata record: title, authors, editors, affiliations, abstract (when deposited), journal or container with the volume, issue, pages, and article number that locate the work in it, ISSNs and ISBNs, publication date, type, license, full-text links, and funder acknowledgements. Where the record deposits them it also carries the conference event of a proceedings paper (event), the approval date that dissertations and most standards deposit in place of a publication date (approved, never read into published), the institutions a record names (the awarding institution of a thesis, the server of a preprint, the laboratories behind a report) and the degree of a thesis, and the subtype and group title of posted content such as a preprint. The author list is paged: authorCount is the full deposited total, offset and limit select the page (25 authors by default), and when authors remain the response carries a nextOffset to pass back as offset — large-collaboration papers deposit thousands. Post-publication updates are relayed as Crossref records them: updatedBy names each correction, retraction, expression of concern, or new version issued against this work, with its notice DOI and whether the publisher or Retraction Watch recorded it, and updateTo names the works this record is itself a notice for. An absent updatedBy does not mean the work was never updated — coverage depends on those deposits. relations lists related identifiers, such as a preprint and its published version, grouped by relation type; only the Crossref-registered DOIs among them resolve through crossref_get_work. memberId is the Crossref member that holds the DOI now — pass it to crossref_get_member for the publisher record and its deposit coverage; the prefix of the DOI names the member that registered the prefix, which for a transferred title is a former publisher. Outgoing references are reported as a count in referencesCount; the reference entries themselves come from	Not declared	Yes	Yes	Not declared
`crossref_search_funders`Finds funders registered in the Crossref Funder Registry by name or funder DOI. Provide funder_doi for an exact single-funder lookup — the full DOI ("10.13039/100000001"), the bare registry ID ("100000001"), or either behind a doi: or https://doi.org/ prefix — or query for name-based search. Name-query results page with offset — the nextOffset enrichment carries the value for the following page, up to offset + rows = 100000. Set include_works to true to also return a page of the most recent works funded by the matched funder; that list pages two ways, in two orders. works_offset is the simple one: newest published first, capped ten times lower at works_offset + rows = 10000. works_cursor has no ceiling and reaches the whole funded-works list, newest registered first — ordered by the date each DOI was registered with Crossref, since Crossref does not walk a publication-date sort by cursor: pass works_cursor="*" on the first call, then chain the nextWorksCursor token from each response. The two cannot be combined, and a cursor walk always starts at the most recently registered work — it cannot resume from an offset. This list also counts works funded by the funder's registry descendants, which a crossref_search_works filter on {"funder": "10.13039/<id>"} does not; a funder_doi lookup returns those descendants' registry IDs as descendants, and the funder's own ID OR'd with each of them in the funder filter ({"funder": "<id>,funder:<descendant>,…"}) counts the same scope with date, type, or other filters. Returns funder name, registry ID, country, and alternate names, plus the work count of the ID alone on a funder_doi lookup. The Funder Registry supersedes entries, and a deprecated one answers to the same names as its successor while carrying only a fraction of its works: such a record carries replacedBy with the superseding registry ID and the response carries a notice naming it. The replacement is never followed automatically — re-run with funder_doi set to that ID t	Finds funders registered in the Crossref Funder Registry by name or funder DOI. Provide funder_doi for an exact single-funder lookup — the full DOI ("10.13039/100000001"), the bare registry ID ("100000001"), or either behind a doi: or https://doi.org/ prefix — or query for name-based search. Name-query results page with offset — the nextOffset enrichment carries the value for the following page, up to offset + rows = 100000. Set include_works to true to also return a page of the most recent works funded by the matched funder; that list pages two ways, in two orders. works_offset is the simple one: newest published first, capped ten times lower at works_offset + rows = 10000. works_cursor has no ceiling and reaches the whole funded-works list, newest registered first — ordered by the date each DOI was registered with Crossref, since Crossref does not walk a publication-date sort by cursor: pass works_cursor="*" on the first call, then chain the nextWorksCursor token from each response. The two cannot be combined, and a cursor walk always starts at the most recently registered work — it cannot resume from an offset. This list also counts works funded by the funder's registry descendants, which a crossref_search_works filter on {"funder": "10.13039/<id>"} does not; a funder_doi lookup returns those descendants' registry IDs as descendants, and the funder's own ID OR'd with each of them in the funder filter ({"funder": "<id>,funder:<descendant>,…"}) counts the same scope with date, type, or other filters. Returns funder name, registry ID, country, and alternate names, plus the work count of the ID alone on a funder_doi lookup. The Funder Registry supersedes entries, and a deprecated one answers to the same names as its successor while carrying only a fraction of its works: such a record carries replacedBy with the superseding registry ID and the response carries a notice naming it. The replacement is never followed automatically — re-run with funder_doi set to that ID t	Not declared	Yes	Not declared	Yes
`crossref_search_journals`Finds Crossref journal records by ISSN or title query. Provide issn for an exact single-journal lookup, or query for title-based search returning up to rows results. Title-query results page with offset — the nextOffset enrichment carries the value for the following page, up to offset + rows = 100000. Set include_works to true to also return a page of the matched journal's most recent works — the works deposited under any of its ISSNs, whichever one you passed; that list pages two ways, in two orders. works_offset is the simple one: newest published first, capped ten times lower at works_offset + rows = 10000. works_cursor has no ceiling and reaches the whole works list, newest registered first — ordered by the date each DOI was registered with Crossref, since Crossref does not walk a publication-date sort by cursor: pass works_cursor="*" on the first call, then chain the nextWorksCursor token from each response. The two cannot be combined, and a cursor walk always starts at the most recently registered work — it cannot resume from an offset. Returns journal metadata: title, publisher, ISSNs with their print or electronic form, subject areas, DOI counts (total, current, backfile), and per-category metadata deposit coverage — how completely the journal deposits abstracts, references, ORCIDs, funders, licenses, and similar metadata. An issn lookup also returns DOI counts by issued year.	Finds Crossref journal records by ISSN or title query. Provide issn for an exact single-journal lookup, or query for title-based search returning up to rows results. Title-query results page with offset — the nextOffset enrichment carries the value for the following page, up to offset + rows = 100000. Set include_works to true to also return a page of the matched journal's most recent works — the works deposited under any of its ISSNs, whichever one you passed; that list pages two ways, in two orders. works_offset is the simple one: newest published first, capped ten times lower at works_offset + rows = 10000. works_cursor has no ceiling and reaches the whole works list, newest registered first — ordered by the date each DOI was registered with Crossref, since Crossref does not walk a publication-date sort by cursor: pass works_cursor="*" on the first call, then chain the nextWorksCursor token from each response. The two cannot be combined, and a cursor walk always starts at the most recently registered work — it cannot resume from an offset. Returns journal metadata: title, publisher, ISSNs with their print or electronic form, subject areas, DOI counts (total, current, backfile), and per-category metadata deposit coverage — how completely the journal deposits abstracts, references, ORCIDs, funders, licenses, and similar metadata. An issn lookup also returns DOI counts by issued year.	Not declared	Yes	Not declared	Yes
`crossref_search_works`Searches the Crossref works index (~188M records) by free text and/or structured filters. The generic query matches loosely across all fields; scope precisely with the field-specific parameters queryTitle, queryAuthor, and queryContainerTitle, or resolve a known citation to its DOI with queryBibliographic — all combine with each other and with query. Use the filter parameter for structured filtering (object with hyphen-separated Crossref keys). Sort options: relevance, score, is-referenced-by-count, published, deposited, indexed, created. Each work returns at most authorLimit authors (25 by default) with authorCount reporting the full deposited total, since a single page of large-collaboration papers can carry tens of thousands of author entries; crossref_get_work pages the whole author list for any DOI whose list was cut. Post-publication updates ride each work as Crossref records them: updatedBy names each correction, retraction, expression of concern, or new version issued against it, and updateTo the works it is itself a notice for — an absent updatedBy does not mean the work was never updated. Offset-based paging is capped at ~10K results; use cursor="*" to start cursor-based deep paging, then pass the nextCursor value from each response to continue. A walk with a query term and no sort runs by relevance, one with filters only in Crossref registration order. The walk ends on the page where nextCursor is absent — that page also carries a notice saying the list is exhausted. Cursor and offset cannot be combined.	Searches the Crossref works index (~188M records) by free text and/or structured filters. The generic query matches loosely across all fields; scope precisely with the field-specific parameters queryTitle, queryAuthor, and queryContainerTitle, or resolve a known citation to its DOI with queryBibliographic — all combine with each other and with query. Use the filter parameter for structured filtering (object with hyphen-separated Crossref keys). Sort options: relevance, score, is-referenced-by-count, published, deposited, indexed, created. Each work returns at most authorLimit authors (25 by default) with authorCount reporting the full deposited total, since a single page of large-collaboration papers can carry tens of thousands of author entries; crossref_get_work pages the whole author list for any DOI whose list was cut. Post-publication updates ride each work as Crossref records them: updatedBy names each correction, retraction, expression of concern, or new version issued against it, and updateTo the works it is itself a notice for — an absent updatedBy does not mean the work was never updated. Offset-based paging is capped at ~10K results; use cursor="*" to start cursor-based deep paging, then pass the nextCursor value from each response to continue. A walk with a query term and no sort runs by relevance, one with filters only in Crossref registration order. The walk ends on the page where nextCursor is absent — that page also carries a notice saying the list is exhausted. Cursor and offset cannot be combined.	Not declared	Yes	Not declared	Yes

Details

Registry status: Active
Published: Nov 14, 2026
Updated: Nov 14, 2026
Website: Not given
Repository: https://github.com/cyanheads/crossref-mcp-server⁠ (opens in a new tab)
Categories (suggested): Knowledge and notesSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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