pool_get_disks

THE RISK

Low Risk

Why pool_get_disks needs a policy

This tool queries and returns information about disks in a storage pool. It performs no modifications, deletions, or external operations—purely a data retrieval action. The severity is low as misuse only reveals existing infrastructure details rather than causing harm.

From the tool's definition Tool name 'pool_get_disks' and description 'Get list of disks in a pool' indicate a retrieval operation with no side effects.

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

POLICY

How to control pool_get_disks

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_get_disks:

policy.json

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

pool_get_disks 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

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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 →
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FAQ

Questions about pool_get_disks

What does the pool_get_disks tool do? +

Get list of disks in 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_get_disks? +

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

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

Can I rate-limit pool_get_disks? +

Yes. Add a rate_limit block to the pool_get_disks 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_get_disks completely? +

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

pool_get_disks 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 →