opn_mcp_info

THE RISK

Low Risk

Why opn_mcp_info needs a policy

This tool retrieves informational data about the MCP server itself (version and configuration). It has no side effects, does not execute commands, does not modify data, and does not move money. It is a pure read operation with minimal blast radius even if an AI agent calls it with arbitrary arguments—the returned data is static metadata.

From the tool's definition Tool name 'opn_mcp_info' and description 'Get MCP server version and runtime configuration' indicate a retrieval operation that queries system metadata without modifying state or triggering external actions.

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

POLICY

How to control opn_mcp_info

PolicyLayer is an MCP gateway — it sits between your AI agents and OPNsense MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for opn_mcp_info:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "opn_mcp_info": {}
  }
}

opn_mcp_info is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register OPNsense 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 81 OPNsense MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about opn_mcp_info

What does the opn_mcp_info tool do? +

Get MCP server version and runtime configuration. It is categorised as a Read tool in the OPNsense MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on opn_mcp_info? +

Register the OPNsense MCP Server MCP server in PolicyLayer and add a rule for opn_mcp_info: 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 OPNsense MCP Server. Nothing to install.

What risk level is opn_mcp_info? +

opn_mcp_info is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit opn_mcp_info? +

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

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

opn_mcp_info is provided by the OPNsense MCP Server MCP server (lucamarien/opnsense-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OPNsense MCP Server tool call.

Start from OPNsense 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 →