AI agents call get_devices_by_interface 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 retrieves and groups information about devices associated with network interfaces. It performs a read-only query operation without creating, modifying, deleting, or executing any changes to the firewall or network configuration. The action is informational only, making it a Read category tool with low severity.
From the tool's definition Tool name 'get_devices_by_interface' and description 'Group devices by network interface' indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_devices_by_interface 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 get_devices_by_interface:
{
"version": "1",
"default": "deny",
"tools": {
"get_devices_by_interface": {}
}
}get_devices_by_interface is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Group devices by network interface. 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 get_devices_by_interface: 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.
get_devices_by_interface 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 get_devices_by_interface 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 get_devices_by_interface. 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.
get_devices_by_interface 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.