iscsi_targetextent_create

THE RISK

Medium Risk

Why iscsi_targetextent_create needs a policy

This tool creates a new iSCSI target-to-extent mapping, which is a reversible write operation that establishes storage access configuration. While this modifies system configuration and could impact storage availability if misconfigured, it is not immediately destructive or irreversible.

From the tool's definition Tool name 'iscsi_targetextent_create' explicitly indicates creation action. Description states 'Create an iSCSI target-to-extent mapping', which adds a new configuration mapping between iSCSI targets and storage extents.

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

POLICY

How to control iscsi_targetextent_create

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 iscsi_targetextent_create:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "iscsi_targetextent_create": {
      "limits": [
        {
          "counter": "iscsi_targetextent_create_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

iscsi_targetextent_create stays usable, but capped — an agent stuck in a loop can't make hundreds of changes 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.

LIMIT 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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about iscsi_targetextent_create

What does the iscsi_targetextent_create tool do? +

Create an iSCSI target-to-extent mapping. It is categorised as a Write tool in the Truenas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on iscsi_targetextent_create? +

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

iscsi_targetextent_create is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit iscsi_targetextent_create? +

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

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

iscsi_targetextent_create 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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