Resolve a DOI to authoritative bibliographic metadata via Crossref. Returns work type, title, container (journal), publisher, dates, abstract, authors (ORCID + affiliations), pages, ISSN/ISBN, license, subjects, reference + citation counts.
AI agents call paper.doi-lookup to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure data retrieval operation querying an external bibliographic database (Crossref). It retrieves publicly available academic metadata with no side effects, no state changes, and no ability to modify or delete information. The only minor consideration is that it depends on an external API, but the tool itself performs only a lookup operation.
From the tool's definition Tool resolves DOI to bibliographic metadata via Crossref API. Returns read-only information: title, authors, abstract, citations, dates, ISSN/ISBN, license, subjects. No creation, modification, deletion, code execution, or financial transactions involved.
Attacks that exploit this kind of access
Resolve a DOI to authoritative bibliographic metadata via Crossref. Returns work type, title, container (journal), publisher, dates, abstract, authors (ORCID + affiliations), pages, ISSN/ISBN, license, subjects, reference + citation counts. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for paper.doi-lookup: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp. Nothing to install.
paper.doi-lookup is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the paper.doi-lookup rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for paper.doi-lookup. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
paper.doi-lookup is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →