acme_dns_authenticator_list

THE RISK

Low Risk

Why acme_dns_authenticator_list needs a policy

The tool only retrieves and displays a read-only list of ACME DNS authenticator configurations. It performs no modifications, deletions, or triggering of external actions. Even if an agent views this list, it cannot cause harmful outcomes without subsequent Write or Execute operations. The blast radius is minimal—at worst, an agent learns about existing DNS authenticator configurations.

From the tool's definition 'List all configured ACME DNS authenticators' - this is a list/query operation that retrieves existing configuration data without modification or side effects.

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

POLICY

How to control acme_dns_authenticator_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 acme_dns_authenticator_list:

policy.json

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

acme_dns_authenticator_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.

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EXPLORE

Related tools and policies

More Truenas tools

Destructive acme_dns_authenticator_delete Delete an ACME DNS authenticator by its ID. Destructive alertservice_delete Delete an alert notification service by its ID. Use alertservice_list to find the ID. Destructive api_key_delete Delete an API key by its numeric ID. Use api_key_list to find the ID. This immediately rev Destructive app_delete Delete/uninstall an app. This is a DESTRUCTIVE operation. The Destructive bootenv_delete Delete a boot environment. This is a DESTRUCTIVE operation — the Destructive certificate_delete Delete a certificate by its ID. This is a DESTRUCTIVE operation — the Destructive cloud_backup_delete Delete a cloud backup task (destructive — requires confirm) Destructive cloudsync_credentials_delete Delete a cloud sync credential

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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 acme_dns_authenticator_list

What does the acme_dns_authenticator_list tool do? +

List all configured ACME DNS authenticators. These are used for DNS-01 challenge validation when issuing ACME certificates. 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 acme_dns_authenticator_list? +

Register the Truenas MCP server in PolicyLayer and add a rule for acme_dns_authenticator_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 acme_dns_authenticator_list? +

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

Can I rate-limit acme_dns_authenticator_list? +

Yes. Add a rate_limit block to the acme_dns_authenticator_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 acme_dns_authenticator_list completely? +

Set action: deny in the PolicyLayer policy for acme_dns_authenticator_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 acme_dns_authenticator_list? +

acme_dns_authenticator_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.

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