AI agents call pfsense_get_firewall_states_size to retrieve information from Pfsense without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries firewall connection state statistics and returns size information. It performs no data modification, deletion, or external operations. While the server overall provides extensive firewall control capabilities, this specific tool is purely informational—reading current state metrics. The blast radius of misuse is minimal as it only exposes monitoring data about existing connections.
From the tool's definition Tool name contains 'get' and description shows GET HTTP method to retrieve firewall states size information. The endpoint /api/v2/firewall/states/size is a read-only query that retrieves monitoring/diagnostic data without modification.
Attacks that exploit this kind of access
GET /api/v2/firewall/states/size. It is categorised as a Read tool in the Pfsense MCP Server, which means it retrieves data without modifying state.
Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_get_firewall_states_size: 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 Pfsense. Nothing to install.
pfsense_get_firewall_states_size 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 pfsense_get_firewall_states_size 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 pfsense_get_firewall_states_size. 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.
pfsense_get_firewall_states_size is provided by the Pfsense MCP server (abl030/pfsense-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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