AI agents call ssh_show_pf_rules 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 queries firewall rule state and returns information for inspection. It has no capability to modify, delete, or execute code—only to retrieve and display existing packet filter rules via SSH. This is a classic read operation with no side effects, corresponding to the 'Read' category.
From the tool's definition Tool name 'ssh_show_pf_rules' uses 'show' verb which is a read-only operation. Description confirms it 'Show packet filter rules', which retrieves and displays existing firewall rules without modification.
Documented attack patterns abuse exactly the kind of access ssh_show_pf_rules 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 ssh_show_pf_rules:
{
"version": "1",
"default": "deny",
"tools": {
"ssh_show_pf_rules": {}
}
}ssh_show_pf_rules is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Show packet filter rules via SSH. 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 ssh_show_pf_rules: 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.
ssh_show_pf_rules 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 ssh_show_pf_rules 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 ssh_show_pf_rules. 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.
ssh_show_pf_rules 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.