pool_attachments

THE RISK

Low Risk

Why pool_attachments needs a policy

This tool queries and retrieves information about services and resources associated with a storage pool. The verb 'Get' explicitly indicates a read-only operation that returns data without creating, modifying, deleting, or executing any operations. It poses minimal security risk as it only exposes visibility into existing pool attachments.

From the tool's definition Tool name 'pool_attachments' with description 'Get services and resources attached to a pool' indicates a retrieval operation with no modification or side effects.

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

POLICY

How to control pool_attachments

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 pool_attachments:

policy.json

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

pool_attachments 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 →

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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 pool_attachments

What does the pool_attachments tool do? +

Get services and resources attached to a pool. 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 pool_attachments? +

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

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

Can I rate-limit pool_attachments? +

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

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

pool_attachments 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 →