opn_list_ddns_accounts

THE RISK

Low Risk

Why opn_list_ddns_accounts needs a policy

This tool retrieves or queries DDNS (Dynamic DNS) account information from an OPNsense firewall. The 'list' operation has no side effects—it only returns existing account data. No modification, deletion, or execution of external operations occurs. Blast radius is minimal as it only exposes configuration data that an AI might read to understand current state.

From the tool's definition Tool name 'opn_list_ddns_accounts' indicates a listing/querying operation. The 'list' verb is characteristic of Read operations that retrieve data without modification.

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

POLICY

How to control opn_list_ddns_accounts

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_list_ddns_accounts:

policy.json

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

opn_list_ddns_accounts 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.

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EXPLORE

Related tools and policies

More OPNsense MCP Server tools

Destructive opn_delete_alias opn_delete_alias Destructive opn_delete_ddns_account Delete a Dynamic DNS account by UUID and apply the configuration. Destructive opn_delete_dns_override opn_delete_dns_override Destructive opn_delete_dnsmasq_range Delete a dnsmasq DHCP range by UUID and apply the configuration. Destructive opn_delete_firewall_category opn_delete_firewall_category Destructive opn_delete_firewall_rule opn_delete_firewall_rule Destructive opn_delete_nat_rule opn_delete_nat_rule Destructive opn_haproxy_delete opn_haproxy_delete

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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_list_ddns_accounts

What does the opn_list_ddns_accounts tool do? +

opn_list_ddns_accounts. 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_list_ddns_accounts? +

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

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

Can I rate-limit opn_list_ddns_accounts? +

Yes. Add a rate_limit block to the opn_list_ddns_accounts 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_list_ddns_accounts completely? +

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

opn_list_ddns_accounts 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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