AI agents call get_ontology_ancestors to retrieve information from OrigeneMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to query and return ontology hierarchy data without modifying, deleting, or executing external operations. While the empty description reduces confidence slightly, the semantic context of 'get_' prefix and placement among read-only biomedical query tools suggests this retrieves (rather than modifies) ontological relationships. No evidence of side effects, code execution, or data mutation.
From the tool's definition Tool name 'get_ontology_ancestors' indicates a retrieval operation (fetch ancestors from an ontology structure).
Documented attack patterns abuse exactly the kind of access get_ontology_ancestors gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OrigeneMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_ontology_ancestors:
{
"version": "1",
"default": "deny",
"tools": {
"get_ontology_ancestors": {}
}
}get_ontology_ancestors is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_ontology_ancestors. It is categorised as a Read tool in the OrigeneMCP MCP Server, which means it retrieves data without modifying state.
Register the Origene MCP server in PolicyLayer and add a rule for get_ontology_ancestors: 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 OrigeneMCP. Nothing to install.
get_ontology_ancestors 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_ontology_ancestors 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_ontology_ancestors. 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_ontology_ancestors is provided by the Origene MCP server (gentel-lab/origenemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OrigeneMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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439 OrigeneMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.