Update system firewall settings
AI agents use system_update_firewall_settings to create or update resources in OPNSense MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your OPNSense MCP Server environment.
This tool modifies firewall configuration settings but does not delete data or cause irreversible damage. While firewall misconfigurations could have severe network impact (justifying 'high' severity), the operation itself is Write-category because settings updates are typically reversible through reconfiguration.
From the tool's definition Tool name contains 'update' and description states 'Update system firewall settings'. The sibling tools on this server include destructive operations (acme_delete_action, acme_revoke_certificate) and the server manages critical infrastructure (OPNSense…
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access system_update_firewall_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 system_update_firewall_settings:
{
"version": "1",
"default": "deny",
"tools": {
"system_update_firewall_settings": {
"limits": [
{
"counter": "system_update_firewall_settings_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}system_update_firewall_settings stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Update system firewall settings. It is categorised as a Write tool in the OPNSense MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the OPNSense MCP Server MCP server in PolicyLayer and add a rule for system_update_firewall_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.
system_update_firewall_settings is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the system_update_firewall_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 system_update_firewall_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.
system_update_firewall_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.