query_sparql

THE RISK

High Risk

Why query_sparql needs a policy

The tool executes raw, caller-supplied SPARQL queries against a live endpoint. While SPARQL is primarily a query language, 'RAW' execution with arbitrary input could include SPARQL Update operations (INSERT, DELETE, DROP) if the endpoint supports them, making this Execute at minimum.

From the tool's definition "Execute a RAW SPARQL query against schema.gov.it" — the tool runs arbitrary SPARQL queries supplied by the caller

Documented attack patterns abuse exactly the kind of access query_sparql gives an agent:

POLICY

How to control query_sparql

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 query_sparql:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "query_sparql": {
      "limits": [
        {
          "counter": "query_sparql_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

query_sparql stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Schema Gov It MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Schema Gov It MCP Server tools

Execute query_external_endpoint Execute a SPARQL query against any public HTTPS SPARQL endpoint. Args: - endpointUrl: URL Execute query_local_ontology Execute a SPARQL SELECT query against an ontology available on the server filesystem or th Execute query_uploaded_store Execute a SPARQL SELECT query against a temporary ontology store created via HTTP upload. Write get_upload_instructions Returns the exact curl command to upload a local RDF file to this MCP server and get back Read explore_dataset Get details of a specific Dataset including metadata and distributions. Use this for targ Read navigate_skos_hierarchy Navigate a SKOS hierarchy upward and/or downward from a concept. Args: - uri: Concept URI Read suggest_improvements Analyze the ontology for structural issues. Args: - limit: Maximum issues per category (d Read suggest_new_tools Analyze usage logs to suggest new specialized tools. Args: None Returns: - List of recom

All 47 Schema Gov It MCP Server tools →

Execute tools on other servers

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Go deeper

High-risk tools in Schema Gov It MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about query_sparql

What does the query_sparql tool do? +

Execute a RAW SPARQL query against schema.gov.it. Args: - query: The SPARQL query to execute (prefixes are auto-injected) - source:. It is categorised as a Execute tool in the Schema Gov It MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on query_sparql? +

Register the Schema Gov It MCP Server MCP server in PolicyLayer and add a rule for query_sparql: 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.

What risk level is query_sparql? +

query_sparql is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit query_sparql? +

Yes. Add a rate_limit block to the query_sparql 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.

How do I block query_sparql completely? +

Set action: deny in the PolicyLayer policy for query_sparql. 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.

What MCP server provides query_sparql? +

query_sparql 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.

Enforce policy on every Schema Gov It MCP Server tool call.

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.

CHECK YOUR STACK →