Compare two HPO terms and find their relationship and common ancestors
AI agents call compare_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.
The tool queries and analyzes data from the Human Phenotype Ontology without side effects. Comparing terms and finding relationships are read-only operations. The entire server suite (search, browse hierarchy, analyze terms, get ancestors/descendants/parents/children) consists of informational queries over a public scientific database with no capability to modify, delete, or execute arbitrary operations.
From the tool's definition Tool performs comparison and retrieval of relationships between HPO terms with 'find their relationship and common ancestors' - no modifications, deletions, or code execution
Attacks that exploit this kind of access
Compare two HPO terms and find their relationship and common ancestors. 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 compare_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.
compare_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 compare_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 compare_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.
compare_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.
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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