AI agents call extract_locus to retrieve information from Gwas without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves genotype data from a genomic region for analysis purposes. While it accesses sensitive biological data, it performs no write, delete, execute, or financial operations. The operation is purely informational and read-based, making it a Read category tool with low severity—the primary risk is data confidentiality rather than system integrity or irreversible damage.
From the tool's definition Tool name 'extract_locus' and description 'Extract genotype data for a specific genomic region' indicate data retrieval with no modification or deletion. The phrase 'for fine-mapping' confirms this is a read-only analytical operation.
Attacks that exploit this kind of access
Extract genotype data for a specific genomic region around a lead SNP for fine-mapping. It is categorised as a Read tool in the Gwas MCP Server, which means it retrieves data without modifying state.
Register the Gwas MCP server in PolicyLayer and add a rule for extract_locus: 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 Gwas. Nothing to install.
extract_locus 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 extract_locus 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 extract_locus. 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.
extract_locus is provided by the Gwas MCP server (muslus/gwas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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