opn_remove_dnsbl_allowlist

THE RISK

Critical Risk

Why opn_remove_dnsbl_allowlist needs a policy

The tool name 'opn_remove_dnsbl_allowlist' strongly implies deletion of an entry from a DNS Block List allowlist on an OPNsense firewall. Removing allowlist entries could cause previously permitted domains to be blocked, potentially disrupting network services.

From the tool's definition Tool name contains 'remove', suggesting irreversible deletion of a DNSBL allowlist entry

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

POLICY

How to control opn_remove_dnsbl_allowlist

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_remove_dnsbl_allowlist:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "opn_remove_dnsbl_allowlist"
  ]
}

opn_remove_dnsbl_allowlist disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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

Critical-risk tools in OPNsense MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-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.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about opn_remove_dnsbl_allowlist

What does the opn_remove_dnsbl_allowlist tool do? +

opn_remove_dnsbl_allowlist. It is categorised as a Destructive tool in the OPNsense MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on opn_remove_dnsbl_allowlist? +

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

opn_remove_dnsbl_allowlist is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit opn_remove_dnsbl_allowlist? +

Yes. Add a rate_limit block to the opn_remove_dnsbl_allowlist 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_remove_dnsbl_allowlist completely? +

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

opn_remove_dnsbl_allowlist 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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