oakvar_query · OakVar MCP Server MCP: Risk & Policy

WHAT IT DOES

What oakvar_query does on OakVar MCP Server

AI agents invoke oakvar_query to trigger actions in OakVar MCP Server. 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 oakvar_query needs a policy

This tool executes arbitrary SQL queries against a database. While named 'query', it explicitly runs SQL which could include destructive statements (DROP, DELETE, UPDATE) depending on what SQL is permitted. Even if read-only, executing arbitrary SQL is in the Execute category.

From the tool's definition Execute a SQL query on an OakVar result database

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

oakvar_query Rate-limited

oakvar_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": {
    "oakvar_query": {
      "limits": [
        {
          "counter": "oakvar_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 OakVar MCP Server, so you can run agents against it safely.

FAQ

Questions about oakvar_query

What does the oakvar_query tool do? +

Execute a SQL query on an OakVar result database. It is categorised as a Execute tool in the OakVar 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 oakvar_query? +

Register the OakVar MCP Server MCP server in PolicyLayer and add a rule for oakvar_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 OakVar MCP Server. Nothing to install.

What risk level is oakvar_query? +

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

Can I rate-limit oakvar_query? +

Yes. Add a rate_limit block to the oakvar_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 oakvar_query completely? +

Set action: deny in the PolicyLayer policy for oakvar_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 oakvar_query? +

oakvar_query is provided by the OakVar MCP Server MCP server (miliyarsh/oakvar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.