opn_reconfigure_unbound

THE RISK

High Risk

Why opn_reconfigure_unbound needs a policy

Reconfiguring Unbound DNS on a firewall applies changes to the DNS resolver service, which is an operational action (reloading/restarting a service with new configuration). This falls under Execute as it triggers an external operation. The blast radius is high because misconfiguration could disrupt DNS resolution for the entire network. Confidence is reduced due to the empty description.

From the tool's definition Tool name 'opn_reconfigure_unbound' suggests reconfiguring the Unbound DNS resolver on OPNsense. Description is empty.

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

POLICY

How to control opn_reconfigure_unbound

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_reconfigure_unbound:

policy.json

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

opn_reconfigure_unbound 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 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.

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EXPLORE

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All 81 OPNsense MCP Server tools →

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Go deeper

High-risk tools in OPNsense 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 opn_reconfigure_unbound

What does the opn_reconfigure_unbound tool do? +

opn_reconfigure_unbound. It is categorised as a Execute tool in the OPNsense 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 opn_reconfigure_unbound? +

Register the OPNsense MCP Server MCP server in PolicyLayer and add a rule for opn_reconfigure_unbound: 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_reconfigure_unbound? +

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

Can I rate-limit opn_reconfigure_unbound? +

Yes. Add a rate_limit block to the opn_reconfigure_unbound 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_reconfigure_unbound completely? +

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

opn_reconfigure_unbound 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.

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