MCP server

Crossref

io.github.cyanheads/crossref-mcp-server

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

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

Working at last checkAbout 5,922 tokens per request once connected7 tools

Source

https://crossref.caseyjhand.com/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 7
Token cost: About 5,922 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to Cursor Add to VS Code VS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.crossref-mcp-server]
url = "https://crossref.caseyjhand.com/mcp"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"crossref-mcp-server":{"type":"http","url":"https://crossref.caseyjhand.com/mcp"}}}

Antigravity

agy mcp add crossref-mcp-server https://crossref.caseyjhand.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"crossref-mcp-server","server_url":"https://crossref.caseyjhand.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"crossref-mcp-server","server_url":"https://crossref.caseyjhand.com/mcp"}

Tools

crossref_get_member ~268 tokens
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
crossref_get_prefix ~224 tokens
Resolves a DOI prefix — the registrant portion of a DOI, e.g. "10.1038" — to its owning Crossref member: the publisher name and numeric member ID. Answers "who publishes DOIs starting with 10.1038?" The Crossref prefix record carries only these three facts (no counts, coverage, or flags); the return
crossref_get_references ~499 tokens
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
crossref_get_work ~787 tokens
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 ackn
crossref_search_funders ~1170 tokens
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-qu
crossref_search_journals ~1091 tokens
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 = 10000
crossref_search_works ~1883 tokens
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 queryBibliog

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