sql_query · Ontario Data MCP: Risk & Policy

WHAT IT DOES

What sql_query does on Ontario Data

AI agents invoke sql_query to trigger actions in Ontario Data. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why sql_query needs a policy

The tool name 'sql_query' strongly implies execution of arbitrary SQL statements against a DuckDB instance. Since the description is empty, confidence is reduced, but the name and server context (DuckDB analytics engine) suggest it runs SQL queries. DuckDB can execute DDL and DML statements (not just SELECT), so arbitrary SQL execution warrants Execute classification with high severity.

From the tool's definition Tool name 'sql_query' combined with server description mentioning 'querying' and 'high-performance analytics via DuckDB'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sql_query Rate-limited

sql_query 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Ontario Data, so you can run agents against it safely.

FAQ

Questions about sql_query

What does the sql_query tool do? +

sql_query. It is categorised as a Execute tool in the Ontario Data MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on sql_query? +

Register the Ontario Data MCP server in PolicyLayer and add a rule for sql_query: 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 Ontario Data. Nothing to install.

What risk level is sql_query? +

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

Can I rate-limit sql_query? +

Yes. Add a rate_limit block to the sql_query 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 sql_query completely? +

Set action: deny in the PolicyLayer policy for sql_query. 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 sql_query? +

sql_query is provided by the Ontario Data MCP server (sprine/ontario-data-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.