This MCP server provides access to the DataCite GraphQL API via the Model Context Protocol (MCP), enabling programmatic discovery of metadata about research outputs. Deployed to Cloudflare Workers, the server supports executing GraphQL queries through MCP, returning rich metadata for DOIs, datasets, software, publications, and their connections within the PID Graph. It enables querying works, datasets, publications, and related entities and exploring relationships among researchers, funders, and organizations. The architecture is designed for reliable hosting and easy integration with Claude Desktop or the Cloudflare AI Playground via an MCP configuration. For compatibility, a legacy Server-Sent Events transport is available at /sse for clients not yet upgraded to the Streamable HTTP transport. The project is released under MIT with an Academic Citation Requirement; citations are expected when used in scholarly publications. Origin validation is enforced by validating the Origin header on every request; additional origins can be authorized with MCP_ALLOWED_ORIGINS (comma-separated, including null to support sandboxed clients). Overall, the DataCite MCP Server aims to support scholarly discovery and data provenance by exposing DataCite's metadata through MCP.