disk_smart_test_run

THE RISK

High Risk

Why disk_smart_test_run needs a policy

This tool triggers an external hardware diagnostic operation (SMART test) on physical disks. It executes a job/process rather than simply reading data or modifying configuration. While SMART tests are generally non-destructive, running them can impact disk performance and involves executing a background job on hardware devices.

From the tool's definition Run a SMART test on one or more disks. Returns a job ID for the test.

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

POLICY

How to control disk_smart_test_run

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 disk_smart_test_run:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "disk_smart_test_run": {
      "limits": [
        {
          "counter": "disk_smart_test_run_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

disk_smart_test_run stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in Truenas → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-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.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about disk_smart_test_run

What does the disk_smart_test_run tool do? +

Run a SMART test on one or more disks. Returns a job ID for the test. It is categorised as a Execute tool in the Truenas MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on disk_smart_test_run? +

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

disk_smart_test_run is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit disk_smart_test_run? +

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

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

disk_smart_test_run 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 →