AI agents call opn_list_kea_leases 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.
Listing DHCP leases retrieves information about assigned IP addresses and client details without modifying any state. This is a passive query operation with no side effects. While DHCP lease data could be considered sensitive network information, the risk of misuse is low—an AI agent could see network clients but cannot modify, delete, or damage systems through reading leases alone.
From the tool's definition Tool name 'opn_list_kea_leases' contains 'list' which indicates a retrieval operation. Kea is a DHCP server, and 'leases' refers to querying active DHCP lease information.
Documented attack patterns abuse exactly the kind of access opn_list_kea_leases 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 opn_list_kea_leases:
{
"version": "1",
"default": "deny",
"tools": {
"opn_list_kea_leases": {}
}
}opn_list_kea_leases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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opn_list_kea_leases. 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 opn_list_kea_leases: 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.
opn_list_kea_leases 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 opn_list_kea_leases 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 opn_list_kea_leases. 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.
opn_list_kea_leases 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.
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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81 OPNsense MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.