AI agents call openvpn_list_servers 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 enumerates existing OpenVPN server configurations. It performs a read-only query operation that does not modify, execute, delete, or create any resources. The blast radius is minimal—exposure of this list could reveal infrastructure details but does not enable direct attacks or data manipulation without additional tools.
From the tool's definition Tool name 'openvpn_list_servers' and description 'List all OpenVPN server instances' indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access openvpn_list_servers 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 openvpn_list_servers:
{
"version": "1",
"default": "deny",
"tools": {
"openvpn_list_servers": {}
}
}openvpn_list_servers 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 OpenVPN server instances. 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 openvpn_list_servers: 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.
openvpn_list_servers 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 openvpn_list_servers 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 openvpn_list_servers. 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.
openvpn_list_servers 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.