AI agents call acme_get_settings 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 ACME/Let's Encrypt configuration settings. The 'get' verb and description clearly indicate a read-only operation that queries existing data with no side effects, mutations, or external actions. Despite the incomplete description, the naming pattern and context are unambiguous.
From the tool's definition Tool name 'acme_get_settings' with verb 'get' and description 'Get full ACME/Let' indicates retrieval of ACME certificate settings without modification.
Documented attack patterns abuse exactly the kind of access acme_get_settings 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 acme_get_settings:
{
"version": "1",
"default": "deny",
"tools": {
"acme_get_settings": {}
}
}acme_get_settings is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get full ACME/Let\. 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 acme_get_settings: 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.
acme_get_settings 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 acme_get_settings 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 acme_get_settings. 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.
acme_get_settings 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.