AI agents call list_arp_entries to retrieve information from OPNSense MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only reads and lists ARP (Address Resolution Protocol) table entries from the firewall. It performs no modifications, deletions, or external operations—purely a data retrieval function. The blast radius is minimal: an agent listing ARP entries cannot cause system damage, though the information could theoretically inform reconnaissance if the agent is compromised.
From the tool's definition Tool name 'list_arp_entries' and description 'List all ARP table entries' indicate a query operation that retrieves network state data without modification.
Documented attack patterns abuse exactly the kind of access list_arp_entries gives an agent:
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 list_arp_entries:
{
"version": "1",
"default": "deny",
"tools": {
"list_arp_entries": {}
}
}list_arp_entries is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all ARP table entries. It is categorised as a Read tool in the OPNSense MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OPNSense MCP Server MCP server in PolicyLayer and add a rule for list_arp_entries: 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.
list_arp_entries is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_arp_entries 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.
Set action: deny in the PolicyLayer policy for list_arp_entries. 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.
list_arp_entries is provided by the OPNSense MCP Server MCP server (vespo92/opnsensemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 196 OPNSense MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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196 OPNSense MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.