MCP Servers

crossref-mcp

Enables searching and retrieving scholarly metadata from Crossref's public REST API, including works, journals, funders, and members, without requiring an API key.

README

crossref-mcp

Polski

Crossref REST API MCP server. Wraps the public Crossref REST API (works, journals, funders, members, types, licenses) — no API key required.

Tools
Environment variables
Wiring it up
Local run

Tools

Tool	Parameters	Description
`search_works`	`query, filter, select, sort, order, rows=20, offset=0, cursor`	Search Crossref works (publications)
`get_work`	`doi: str`	Full metadata for a single work by DOI
`get_work_agency`	`doi: str`	Registration agency for a DOI
`list_journals`	`query, rows=20, offset=0, cursor`	List or search journals
`get_journal`	`issn: str`	Journal metadata by ISSN
`get_journal_works`	`issn, query, filter, rows=20, offset=0, cursor`	Works published in a journal
`list_funders`	`query, filter, rows=20, offset=0`	List or search funding bodies
`get_funder`	`funder_id: str`	Funder metadata by Funder Registry ID
`list_members`	`query, filter, rows=20, offset=0`	List or search Crossref members (publishers)
`list_types_and_licenses`	none	Available work types and licenses

Environment variables

Variable	Required	Description
`CROSSREF_MCP_MAILTO`	no	Email address for Crossref's "polite pool" — higher rate limits, faster responses

Wiring it up

Only requirement: uv (https://docs.astral.sh/uv/). Nothing else to install.

Claude Code

claude mcp add crossref-mcp -- uvx --from git+https://github.com/dam2452/crossref-mcp.git crossref-mcp

With the polite pool email set:

claude mcp add crossref-mcp -e CROSSREF_MCP_MAILTO=you@example.com -- uvx --from git+https://github.com/dam2452/crossref-mcp.git crossref-mcp

Claude Desktop / other MCP client

{
  "mcpServers": {
    "crossref-mcp": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/dam2452/crossref-mcp.git", "crossref-mcp"],
      "env": { "CROSSREF_MCP_MAILTO": "you@example.com" }
    }
  }
}

After pushing a new version: uv cache clean and restart the client.

Local run

uv run --directory . crossref-mcp

Tests (manual):

uv run --directory . --with pytest pytest test/

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