List Classes and Properties defined in a specific Ontology. Args: - ontologyUri: URI of the ontology (from list_ontologies) Returns: - List of classes and properties with labels, grouped by type Note: Uses URI prefix heuristic - items whose URI starts with the ontology URI.
AI agents call explore_ontology to retrieve information from Schema Gov It 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 queries semantic metadata from the Italian government data catalog without side effects. It does not create, modify, delete, or execute operations—only reads and presents ontology structure information to support exploration and analysis tasks.
From the tool's definition Tool performs 'List Classes and Properties' with ontologyUri input and returns structured metadata. No data modification, deletion, or external execution occurs. Uses 'heuristic' matching to retrieve catalog information.
Documented attack patterns abuse exactly the kind of access explore_ontology gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Schema Gov It MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for explore_ontology:
{
"version": "1",
"default": "deny",
"tools": {
"explore_ontology": {}
}
}explore_ontology is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List Classes and Properties defined in a specific Ontology. Args: - ontologyUri: URI of the ontology (from list_ontologies) Returns: - List of classes and properties with labels, grouped by type Note: Uses URI prefix heuristic - items whose URI starts with the ontology URI. It is categorised as a Read tool in the Schema Gov It MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Schema Gov It MCP Server MCP server in PolicyLayer and add a rule for explore_ontology: 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 Schema Gov It MCP Server. Nothing to install.
explore_ontology 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 explore_ontology 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 explore_ontology. 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.
explore_ontology is provided by the Schema Gov It MCP Server MCP server (italia/dati-semantic-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Schema Gov It MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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47 Schema Gov It MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.