user_list

THE RISK

Low Risk

Why user_list needs a policy

This tool retrieves information about user accounts without modifying, executing, or destroying any data. It is a standard read operation used for inventory or monitoring purposes. The blast radius of misuse is minimal—an agent could only view user information that may already be accessible through normal system administration.

From the tool's definition Tool name 'user_list' and description 'List all users on the TrueNAS system' indicate a query/retrieval operation with no side effects.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access user_list gives an agent:

POLICY

How to control user_list

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 user_list:

policy.json

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

user_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Truenas — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about user_list

What does the user_list tool do? +

List all users on the TrueNAS system, including system and local accounts. 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 user_list? +

Register the Truenas MCP server in PolicyLayer and add a rule for user_list: 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 user_list? +

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

Can I rate-limit user_list? +

Yes. Add a rate_limit block to the user_list 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 user_list completely? +

Set action: deny in the PolicyLayer policy for user_list. 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 user_list? +

user_list 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.

Enforce policy on every Truenas tool call.

Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →