directory_services_leave

THE RISK

Critical Risk

Why directory_services_leave needs a policy

Leaving an Active Directory or LDAP domain is explicitly flagged as destructive by the tool's own description. This action severs the system's domain membership, which cannot be trivially undone — rejoining requires reconfiguration, credential re-entry, and potential loss of domain-bound permissions, group policies, and user access.

From the tool's definition 'Leave the current Active Directory or LDAP domain. This is a DESTRUCTIVE operation'

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

POLICY

How to control directory_services_leave

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 directory_services_leave:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "directory_services_leave"
  ]
}

directory_services_leave disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

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EXPLORE

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Go deeper

Critical-risk tools in Truenas → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about directory_services_leave

What does the directory_services_leave tool do? +

Leave the current Active Directory or LDAP domain. This is a DESTRUCTIVE operation —. It is categorised as a Destructive tool in the Truenas MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on directory_services_leave? +

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

directory_services_leave is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit directory_services_leave? +

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

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

directory_services_leave 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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