AI agents call search_for_variants to retrieve information from gnomAD MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries a public genomic database (gnomAD) for variant information. Reading genomic data has no side effects, cannot modify records, and presents no irreversible consequences. Confidence is slightly reduced (0.85 vs 1.0) due to the empty description, but the naming pattern and server context strongly indicate Read category.
From the tool's definition Tool name 'search_for_variants' and context indicate data retrieval from the gnomAD database. No description provided, but sibling tools (get_variant_info, get_gene_info, get_metadata, get_region_info, get_clinvar_variant_info, etc.) are all read-only query…
Documented attack patterns abuse exactly the kind of access search_for_variants gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and gnomAD MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for search_for_variants:
{
"version": "1",
"default": "deny",
"tools": {
"search_for_variants": {}
}
}search_for_variants is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_for_variants. It is categorised as a Read tool in the gnomAD MCP Server MCP Server, which means it retrieves data without modifying state.
Register the gnomAD MCP Server MCP server in PolicyLayer and add a rule for search_for_variants: 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 gnomAD MCP Server. Nothing to install.
search_for_variants 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_for_variants 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_for_variants. 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_for_variants is provided by the gnomAD MCP Server MCP server (koido/gnomad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from gnomAD 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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12 gnomAD MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.