CRITICAL: Use this to verify ANY academic citation before mentioning it. Checks multiple databases (CrossRef, OpenAlex, PubMed, zbMATH, ERIC, HAL, INSPIRE-HEP, Semantic Scholar, DBLP) if a paper exists. Returns null if not found.
AI agents call verifyCitation to retrieve information from DOI Citation Verifier without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and validates citation data against academic databases without creating, modifying, deleting, or executing anything. It is a straightforward lookup/verification query that has no side effects beyond returning citation metadata or null. The blast radius of misuse is minimal—worst case, false or unverified citations could be reported, but the tool itself cannot hallucinate, corrupt, or delete data.
From the tool's definition Tool description states it 'Checks multiple databases' and 'Returns null if not found' — pure query/lookup operations with no modification or execution. The word 'Checks' and 'verify' indicate read-only verification against external citation databases.
Documented attack patterns abuse exactly the kind of access verifyCitation gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and DOI Citation Verifier, and nothing reaches the server without passing your rules. This is the rule we recommend for verifyCitation:
{
"version": "1",
"default": "deny",
"tools": {
"verifyCitation": {}
}
}verifyCitation is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
CRITICAL: Use this to verify ANY academic citation before mentioning it. Checks multiple databases (CrossRef, OpenAlex, PubMed, zbMATH, ERIC, HAL, INSPIRE-HEP, Semantic Scholar, DBLP) if a paper exists. Returns null if not found. It is categorised as a Read tool in the DOI Citation Verifier MCP Server, which means it retrieves data without modifying state.
Register the DOI Citation Verifier MCP server in PolicyLayer and add a rule for verifyCitation: 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 DOI Citation Verifier. Nothing to install.
verifyCitation 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 verifyCitation 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 verifyCitation. 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.
verifyCitation is provided by the DOI Citation Verifier MCP server (tfscharff/doi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from DOI Citation Verifier, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
3 DOI Citation Verifier tools catalogued and risk-classified — across an index of 43,000+ MCP servers.