Dismiss an alert by its UUID. Dismissed alerts no longer appear as active but can be restored.
AI agents use alert_dismiss to create or update resources in Truenas — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Truenas environment.
Dismissing an alert modifies its state (active → dismissed) but is explicitly reversible since 'dismissed alerts...can be restored' (as evidenced by the sibling tool alert_restore). This is a Write operation with low severity since it only affects alert visibility, not underlying data or system state.
From the tool's definition Dismiss an alert by its UUID. Dismissed alerts no longer appear as active but can be restored.
Documented attack patterns abuse exactly the kind of access alert_dismiss gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Truenas, and nothing reaches the server without passing your rules. This is the rule we recommend for alert_dismiss:
{
"version": "1",
"default": "deny",
"tools": {
"alert_dismiss": {
"limits": [
{
"counter": "alert_dismiss_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}alert_dismiss 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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Dismiss an alert by its UUID. Dismissed alerts no longer appear as active but can be restored. It is categorised as a Write tool in the Truenas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Truenas MCP server in PolicyLayer and add a rule for alert_dismiss: 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 Truenas. Nothing to install.
alert_dismiss 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 alert_dismiss 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 alert_dismiss. 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.
alert_dismiss is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
279 Truenas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.