io.github.SMABoundless/crossref
CrossRef
Is the io.github.SMABoundless/crossref MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-11-01.
Search and retrieve scholarly metadata from the Crossref REST API
needs mcp<2 probed 2026-11-14 · unchanged since 2026-11-01
A plain install of the package stops at the import below. These tool definitions are from a second install with mcp<2, started in a container with the network off, on 2026-11-01.
MCP error -32000: Connection closed ModuleNotFoundError: No module named 'mcp.server.fastmcp'. This is mcp 2.x, where FastMCP was renamed to MCPServer (from mcp
- Run it
- uvx --with 'mcp<2' crossref-mcp-server@1.0.0 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- CrossRef 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/SMABoundless/crossref-mcp-server.git
- Registry
- active, updated 2026-07-04 · registry entry
- Changes
- 2 recorded, reachable in 0 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
Estimates with the o200k_base tokenizer.
| Tool | o200k estimate | Share of this server |
|---|---|---|
| crossref_search | 379 | 23 % |
| crossref_journal_works | 276 | 17 % |
| crossref_author_search | 273 | 17 % |
| crossref_title_search | 199 | 12 % |
| crossref_journal_search | 114 | 7 % |
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- io.github.SCGIS-Wales/helm-mcp · needs env
- Delhaize receipts io.github.SHIMABEIGI/delhaize-mcp · alive
- io.github.SK-DEV-AI/codesearch · install failed
- io.github.SK-DEV-AI/websearch · alive
- io.github.SMABoundless/orcid · needs mcp<2
- io.github.SMABoundless/scopus · needs mcp<2
- io.github.SMABoundless/unpaywall · needs mcp<2
- rmbr io.github.SRock44/rmbr · needs args
Servers that mention crossref.
- Evident Source Check com.evidentagents/reviews · alive
- com.themineworks/academic-research-mcp · needs auth
- com.thenextgennexus/academic-research-mcp-server · needs auth
- reapx scientific papers - arXiv, OpenAlex and Crossref dev.reapx/scientific-papers · needs auth
- Crossref Scholarly Data io.github.Taru0208/crossref-mcp-server · needs auth
- io.github.cyanheads/crossref-mcp-server · alive
- DONVI108 Free Research Beta io.github.ho11-bit/donvi108-research · needs auth
- xpay Academic Research io.github.xpaysh/academic-research · needs your URL
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-11-01 08:17 | needs mcp<2 | 1.6 s | 10 | 2.8k | 1.7k |
| 2026-10-18 06:44 | crashed on start |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The package imports FastMCP from mcp.server.fastmcp. mcp 2.0, the Python SDK of 28 July 2026, renamed FastMCP to MCPServer, and the package asks for mcp with no upper bound, so a plain install (uvx, pip) gets mcp 2.x and the server stops at the import. Installed with mcp<2, it starts and lists its tools. The fix for the publisher: pin mcp<2 in the dependencies, for example mcp>=1.2,<2, and publish a new version, or move to MCPServer as the SDK's migration guide says. Until then, run it with uvx --with 'mcp<2'.
The cause and the fix, with the code before and after: ModuleNotFoundError: No module named 'mcp.server.fastmcp'