Search arXiv papers, download full text, semantic search, citation graphs, and alerts via MCP.
Nothing to run from here
Crossref is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
7
tools declared
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trust score
remote
at its publisher
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calls last 7d
What it does
Resolve DOIs, search ~155M scholarly works and fetch reference lists via the Crossref REST API.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http crossref-caseyjhand-com-crossref-mcp https://crossref.caseyjhand.com/mcp
# 2 — ask your agent for something these tools do
# crossref_get_work, crossref_get_references, crossref_search_works and 4 more
Crossref costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
CCAll 1 server
crossref.caseyjhand.com1 server
1 category
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http crossref-caseyjhand-com-crossref-mcp https://crossref.caseyjhand.com/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
7 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Resolves a DOI to its full Crossref metadata record: title, authors, affiliations, abstract (when deposited), journal or container, publication date, type, license, full-text links, and funder acknowledgements. 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 pas
| Parameter | Type | Required | Notes |
|---|---|---|---|
| doi | string | yes | DOI in the format "10.NNNN/suffix", e.g. "10.1038/nature12373". Must start with "10." followed by 4–9 digits and a slash. |
| offset | integer | no | Zero-based index of the first author to return. Pass the nextOffset value from the previous response to continue through a long author list. Only the author list is paged; every other field of the rec |
| limit | integer | no | Maximum number of authors to return in one page (1–500, default 25). Ordinary records fit in a single page; large-collaboration papers in particle physics and genomics deposit thousands. |
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 publishe
| Parameter | Type | Required | Notes |
|---|---|---|---|
| doi | string | yes | DOI in the format "10.NNNN/suffix", e.g. "10.1038/nature12373". Must start with "10." followed by 4–9 digits and a slash. |
| offset | integer | no | Zero-based index of the first reference to return. Pass the nextOffset value from the previous response to continue through a long reference list. |
| limit | integer | no | Maximum number of references to return in one page (1–500, default 100). Most works fit in a single page; bibliography records can carry tens of thousands. |
Searches the Crossref works index (~155M 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 filteri
| Parameter | Type | Required | Notes |
|---|---|---|---|
| query | string | no | Free-text search query, e.g. "CRISPR gene editing" or "climate change adaptation" |
| queryBibliographic | string | no | Whole-citation match to resolve a known reference to its DOI. Combine title, author, year, and container into one string, e.g. "Watson Crick molecular structure of nucleic acids Nature 1953". |
| queryTitle | string | no | Match against work titles only, e.g. "Array programming with NumPy". |
| queryAuthor | string | no | Match against author names only, e.g. "Charles R. Harris". |
| queryContainerTitle | string | no | Match against the container title (journal or book name) only, e.g. "Nature". |
| filter | object | no | Structured filter object using Crossref hyphen-separated keys. All values must be strings. Boolean flag keys (has-abstract, has-references, has-full-text) require string values "true" or "false". Exam |
| fields | array | no | Fields to return (reduces payload). Names are case-sensitive. Useful set: DOI, title, author, published, type, is-referenced-by-count, abstract, container-title, publisher, score. DOI is always return |
| rows | number | no | Number of results to return per page (1–100, default 20) |
| authorLimit | integer | no | Maximum number of authors to return per work (1–500, default 25). Ordinary records fit under the default; large-collaboration papers deposit thousands, and a page of them is large enough to exhaust a |
| offset | number | no | Zero-based result offset for offset-based paging. Cannot be used with cursor. Capped at ~10K; use cursor for deeper paging. |
| cursor | string | no | Cursor token for deep paging. Pass "*" to start cursor-based paging (required past ~10K results), then pass the nextCursor value from each response until a response omits it, which means the list is e |
| sort | string | no | Sort field |
| order | string | no | Sort direction (asc or desc) |
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 by pub
| Parameter | Type | Required | Notes |
|---|---|---|---|
| query | string | no | Journal title search query, e.g. "Nature" or "Journal of Machine Learning Research" |
| issn | string | no | ISSN for exact single-journal lookup (print or electronic, with or without hyphen). Example: "1234-5678". |
| include_works | boolean | no | When true, also return a page of the journal's most recent works by publication date. Requires an unambiguous journal — pass issn when a title query matches more than one. A journal with no ISSN regis |
| rows | number | no | Maximum number of journals to return for title queries, or works when include_works is true (1–100, default 10) |
| offset | integer | no | Zero-based offset into the title-query journal list. Pass the nextOffset value from the previous response to continue. Ignored when issn is set, which resolves exactly one record. |
| works_offset | integer | no | Zero-based offset into the journal works list when include_works is true. Pass the nextWorksOffset value from the previous response to continue. Capped at works_offset + rows = 10000; use works_cursor |
| works_cursor | string | no | Cursor token for deep paging of the journal works list when include_works is true. Pass "*" to start the walk at the newest work, then pass the nextWorksCursor value from each response. Has no offset |
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, u
| Parameter | Type | Required | Notes |
|---|---|---|---|
| query | string | no | Funder name search query, e.g. "National Science Foundation" or "Wellcome Trust" |
| funder_doi | string | no | Funder DOI for exact lookup — the full DOI "10.13039/100000001" (NSF) or the bare registry ID "100000001". Supersedes query when provided. |
| include_works | boolean | no | When true, also return a page of works funded by the matched funder. Requires an unambiguous funder — pass funder_doi when a name query matches more than one. |
| rows | number | no | Maximum funders to return for name queries, or works when include_works is true (1–100, default 10) |
| offset | integer | no | Zero-based offset into the name-query funder list. Pass the nextOffset value from the previous response to continue. Ignored when funder_doi is set, which resolves exactly one record. |
| works_offset | integer | no | Zero-based offset into the funded-works list when include_works is true. Pass the nextWorksOffset value from the previous response to continue. Capped at works_offset + rows = 10000; use works_cursor |
| works_cursor | string | no | Cursor token for deep paging of the funded-works list when include_works is true. Pass "*" to start the walk at the newest work, then pass the nextWorksCursor value from each response. Has no offset c |
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?" Resolve a DOI pref
| Parameter | Type | Required | Notes |
|---|---|---|---|
| member_id | integer | yes | Crossref member ID — a positive integer, e.g. 297 (Springer) or 340 (PLOS). Resolve a DOI prefix to a member ID first with crossref_get_prefix. |
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 returned memberId chains directly into crossref_get_member for the full publisher record.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| prefix | string | yes | DOI prefix in the format "10.NNNN" — the registrant portion of a DOI with no "/suffix", e.g. "10.1038" or "10.1371". |
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install Crossref or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
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Alert at 80% · then the tool returns a normal MCP error
Used this month: —
—Grade not published
No rule-by-rule report on file for this release
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
This listing is an address its publisher runs, and you connect to it directly — this marketplace is not in the path. The scanner reads packages and public source, and an address is neither. So there is no grade — not a withheld one, an unmeasured one.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 0.3.9.
0.3.9
undated
latestNo release note was published with this version.
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no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish Crossref can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.