Retrieve multiple HPO terms in a single request (maximum 20 terms)
AI agents call batch_get_hpo_terms to retrieve information from Unofficial HPO MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a batch query operation against the HPO API to fetch phenotypic term data. It has no side effects—it only retrieves and returns information without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal; incorrect queries would simply return no results or irrelevant HPO terms, with no harmful consequence to the system or data integrity.
From the tool's definition Tool retrieves multiple HPO terms from the Human Phenotype Ontology API in batch. The description indicates 'Retrieve multiple HPO terms' with no mention of modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Retrieve multiple HPO terms in a single request (maximum 20 terms). It is categorised as a Read tool in the Unofficial HPO MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Unofficial HPO MCP Server MCP server in PolicyLayer and add a rule for batch_get_hpo_terms: 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 Unofficial HPO MCP Server. Nothing to install.
batch_get_hpo_terms 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 batch_get_hpo_terms 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 batch_get_hpo_terms. 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.
batch_get_hpo_terms is provided by the Unofficial HPO MCP Server MCP server (openpharma-org/hpo-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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