AI agents call variant_lookup to retrieve information from Sniff Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves genomic variant information from a database without creating, modifying, deleting, or executing any code. It is a read-only lookup function that returns pre-computed data about genetic variants. There is no mention of write capabilities, destructive operations, command execution, or financial transactions.
From the tool's definition Tool name 'variant_lookup' and description 'Single-variant lookup by CanFam4 position' with retrieval of 'ref/alt, global + popmax AF, consequence, gene' indicates a query/retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Single-variant lookup by CanFam4 position: ref/alt, global + popmax AF, consequence, gene,. It is categorised as a Read tool in the Sniff Mcp MCP Server, which means it retrieves data without modifying state.
Register the Sniff MCP server in PolicyLayer and add a rule for variant_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 Sniff Mcp. Nothing to install.
variant_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 variant_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 variant_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.
variant_lookup is provided by the Sniff MCP server (https://mcp.sniff.world/mcp/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
variant_lookup is one line of Sniff's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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