Get the best homology match for proteins in a target species.
AI agents call get_homology_best to retrieve information from STRING 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 the STRING protein database to fetch homology information. It is read-only with no side effects—it simply returns matching homology data for proteins across species. The blast radius of misuse is minimal; at worst, an agent retrieves irrelevant or spurious homology results, which would not corrupt data or trigger external actions. Therefore, this is classified as 'Read' with low severity.
From the tool's definition The tool name 'get_homology_best' and description 'Get the best homology match for proteins in a target species' indicate a query/retrieval operation against the STRING database.
Attacks that exploit this kind of access
Get the best homology match for proteins in a target species. It is categorised as a Read tool in the STRING MCP Server MCP Server, which means it retrieves data without modifying state.
Register the STRING MCP Server MCP server in PolicyLayer and add a rule for get_homology_best: 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 STRING MCP Server. Nothing to install.
get_homology_best 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_homology_best 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_homology_best. 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_homology_best is provided by the STRING MCP Server MCP server (munch-group/string-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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