AI agents call get_variant_info 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 publicly available genomic variant metadata from a reference database (Ensembl) based on a variant identifier. It has no side effects, does not modify any data, execute code, or trigger external operations. The response contains informational fields (position, alleles, clinical significance, consequences) typical of read-only database queries.
From the tool's definition Tool description states it 'Get[s] detailed variant/SNP information from Ensembl by rsID. Returns position, alleles, clinical significance, and consequences.' The verbs 'get' and 'returns' indicate pure data retrieval with no modification, creation, or…
Attacks that exploit this kind of access
Get detailed variant/SNP information from Ensembl by rsID. Returns position, alleles, clinical significance, and consequences. 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 get_variant_info: 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.
get_variant_info 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 get_variant_info 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 get_variant_info. 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.
get_variant_info 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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