crossref mcp server for ChatGPT

io.github.cyanheads/crossref-mcp-server

Resolve DOIs, search ~155M scholarly works, and fetch references via the Crossref REST API.

client:ChatGPT transport:streamable-http runtime:npm tools:7

Install crossref mcp server in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://crossref.caseyjhand.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs