AI agents call search_funders to retrieve information from Crossref MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about funding organizations from Crossref, which is a read-only operation with no side effects. No data is created, modified, deleted, or executed. The blast radius of misuse is minimal—an AI could at worst retrieve irrelevant funder metadata.
From the tool's definition The tool name 'search_funders' indicates a search/query operation, and the server description states it enables 'search academic literature and retrieve detailed metadata for papers, journals, and funding organizations via the Crossref database.' Searching…
Documented attack patterns abuse exactly the kind of access search_funders gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crossref MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for search_funders:
{
"version": "1",
"default": "deny",
"tools": {
"search_funders": {}
}
}search_funders is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_funders. It is categorised as a Read tool in the Crossref MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Crossref MCP Server MCP server in PolicyLayer and add a rule for search_funders: 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 Crossref MCP Server. Nothing to install.
search_funders 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 search_funders 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 search_funders. 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.
search_funders is provided by the Crossref MCP Server MCP server (jackkuo666/crossref-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Crossref MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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9 Crossref MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.