alert_categories

List all available alert categories. Useful for understanding the types of alerts the system can generate.

SERVERTruenas SOURCEspranab/truenas-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/alert-categories.md

WHAT IT DOES

What alert_categories does on Truenas

AI agents call alert_categories to retrieve information from Truenas without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why alert_categories is rated Low

This tool retrieves and queries system metadata (available alert categories) without creating, modifying, executing, or deleting any data. It is purely informational and safe for AI agents to use.

From the tool's definition Tool name is 'alert_categories' and description states 'List all available alert categories' - a retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs alert_categories safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Truenas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For alert_categories, this is the rule to start with:

alert_categories Allowed

alert_categories is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "alert_categories": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Truenas, apply this rule, and every alert_categories call is checked against it from then on.

FAQ

Questions about alert_categories

What does the alert_categories tool do? +

List all available alert categories. Useful for understanding the types of alerts the system can generate. It is categorised as a Read tool in the Truenas MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on alert_categories? +

Register the Truenas MCP server in PolicyLayer and add a rule for alert_categories: 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.

What risk level is alert_categories? +

alert_categories is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit alert_categories? +

Yes. Add a rate_limit block to the alert_categories 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.

How do I block alert_categories completely? +

Set action: deny in the PolicyLayer policy for alert_categories. 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.

What MCP server provides alert_categories? +

alert_categories 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.

KEEP EXPLORING

More on Truenas, and thousands of servers like it.

This server

All 279 Truenas tools →

Across the catalogue

get-chuck-categories on Jokes MCP Server → The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →