AI agents call search_gene to retrieve information from Pubmed Search without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries genetic information from the NCBI Gene database without creating, modifying, deleting, or executing any operations. It has no side effects on the database or external systems. Misuse carries minimal risk—worst case, an agent performs inefficient or irrelevant searches, wasting resources but not exposing sensitive data or causing harm.
From the tool's definition Tool name 'search_gene' and description 'Search NCBI Gene database' indicate a query/retrieval operation with no modification or destructive capability. The verb 'search' and context of 'academic databases' confirm read-only functionality.
Documented attack patterns abuse exactly the kind of access search_gene gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Pubmed Search, and nothing reaches the server without passing your rules. This is the rule we recommend for search_gene:
{
"version": "1",
"default": "deny",
"tools": {
"search_gene": {}
}
}search_gene is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search NCBI Gene database. It is categorised as a Read tool in the Pubmed Search MCP Server, which means it retrieves data without modifying state.
Register the Pubmed Search MCP server in PolicyLayer and add a rule for search_gene: 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 Pubmed Search. Nothing to install.
search_gene 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_gene 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_gene. 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_gene is provided by the Pubmed Search MCP server (u9401066/pubmed-search-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Pubmed Search, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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63 Pubmed Search tools catalogued and risk-classified — across an index of 43,000+ MCP servers.