AI agents call monitoring_get_memory_usage 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 memory usage statistics from the OPNSense firewall for monitoring purposes. It has no side effects, does not modify configuration or data, and does not execute commands or trigger operations. It is purely informational, fitting the Read category.
From the tool's definition Tool name 'monitoring_get_memory_usage' and description 'Get memory usage statistics' indicate a query operation that retrieves monitoring data without modifying system state.
Documented attack patterns abuse exactly the kind of access monitoring_get_memory_usage 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 monitoring_get_memory_usage:
{
"version": "1",
"default": "deny",
"tools": {
"monitoring_get_memory_usage": {}
}
}monitoring_get_memory_usage is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get memory usage statistics. 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 monitoring_get_memory_usage: 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.
monitoring_get_memory_usage 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 monitoring_get_memory_usage 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 monitoring_get_memory_usage. 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.
monitoring_get_memory_usage 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.