AI agents call list_ontology_types to retrieve information from Foundry MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates metadata about available ontology types in the Foundry system. It is a read-only query operation with no side effects, no code execution, and no data modification. The blast radius of misuse is minimal—an agent could only discover what ontology types exist, which is informational. This fits the 'Read' category for data retrieval operations.
From the tool's definition Tool name 'list_ontology_types' and description 'List all the ontology types' indicate a retrieval operation with no modification or execution of code/operations.
Documented attack patterns abuse exactly the kind of access list_ontology_types gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Foundry MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_ontology_types:
{
"version": "1",
"default": "deny",
"tools": {
"list_ontology_types": {}
}
}list_ontology_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List all the ontology types. It is categorised as a Read tool in the Foundry MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Foundry MCP Server MCP server in PolicyLayer and add a rule for list_ontology_types: 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 Foundry MCP Server. Nothing to install.
list_ontology_types 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 list_ontology_types 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 list_ontology_types. 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.
list_ontology_types is provided by the Foundry MCP Server MCP server (qwert666/mcp-server-foundry). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Foundry MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
5 Foundry MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.