Add a new Monit alert recipient (email address for notifications)
AI agents use monit_add_alert 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.
The tool creates a new alert recipient configuration, which is a reversible write operation. While it doesn't delete or execute arbitrary code, it does modify system configuration (adding an email to the notification system).
From the tool's definition Tool description states it will 'Add a new Monit alert recipient (email address for notifications)' - this creates a new configuration entry that modifies the alerting system state.
Documented attack patterns abuse exactly the kind of access monit_add_alert 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 monit_add_alert:
{
"version": "1",
"default": "deny",
"tools": {
"monit_add_alert": {
"limits": [
{
"counter": "monit_add_alert_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}monit_add_alert 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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Add a new Monit alert recipient (email address for notifications). 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 monit_add_alert: 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.
monit_add_alert 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 monit_add_alert 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 monit_add_alert. 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.
monit_add_alert 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.