network_interface_get

THE RISK

Low Risk

Why network_interface_get needs a policy

This tool retrieves configuration and status information about a network interface. It is a read-only query that does not modify, execute, delete, or create any system resources. The 'get' operation pattern confirms data retrieval semantics. No blast radius if misused by an agent, as it only returns information that would be available through standard system queries.

From the tool's definition Tool name is 'network_interface_get' and description states 'Get details of a specific network interface by its ID', indicating a retrieval operation with no side effects.

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

POLICY

How to control network_interface_get

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 network_interface_get:

policy.json

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

network_interface_get 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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about network_interface_get

What does the network_interface_get tool do? +

Get details of a specific network interface by its ID (e.g. 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 network_interface_get? +

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

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

Can I rate-limit network_interface_get? +

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

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

network_interface_get 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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