List available Controlled Vocabularies (ConceptSchemes) and their instance counts. Args: - limit: Maximum vocabularies to return (default: 20) Returns: - List of ConceptSchemes with labels and concept counts, ordered by count descending
AI agents call list_vocabularies 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 is a straightforward read operation that queries and retrieves metadata about vocabularies from the Italian government data catalog schema. It has no side effects, makes no modifications to data, executes no code, and has minimal blast radius if misused by an AI agent—at most it could retrieve information an agent wasn't intended to see, but this is low risk for a public catalog interface.
From the tool's definition Tool lists available Controlled Vocabularies and their instance counts without modifying, deleting, or executing any operations. The description uses 'List' and 'return' language indicating data retrieval only.
Documented attack patterns abuse exactly the kind of access list_vocabularies 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 list_vocabularies:
{
"version": "1",
"default": "deny",
"tools": {
"list_vocabularies": {}
}
}list_vocabularies is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List available Controlled Vocabularies (ConceptSchemes) and their instance counts. Args: - limit: Maximum vocabularies to return (default: 20) Returns: - List of ConceptSchemes with labels and concept counts, ordered by count descending. 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 list_vocabularies: 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.
list_vocabularies 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_vocabularies 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_vocabularies. 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_vocabularies 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.