iscsi_extent_list

List all iSCSI extents (LUNs)

SERVERTruenas SOURCEspranab/truenas-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/iscsi-extent-list.md

WHAT IT DOES

What iscsi_extent_list does on Truenas

AI agents call iscsi_extent_list to retrieve information from Truenas without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why iscsi_extent_list is rated Low

This tool retrieves and enumerates iSCSI extents without creating, modifying, or deleting any data. It is purely informational in nature, making it a Read category tool with low severity risk.

From the tool's definition Tool name contains 'list' and description states 'List all iSCSI extents (LUNs)' - a straightforward query operation with no modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs iscsi_extent_list safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Truenas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For iscsi_extent_list, this is the rule to start with:

iscsi_extent_list Allowed

iscsi_extent_list is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Truenas, apply this rule, and every iscsi_extent_list call is checked against it from then on.

FAQ

Questions about iscsi_extent_list

What does the iscsi_extent_list tool do? +

List all iSCSI extents (LUNs). 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 iscsi_extent_list? +

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

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

Can I rate-limit iscsi_extent_list? +

Yes. Add a rate_limit block to the iscsi_extent_list 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_extent_list completely? +

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

iscsi_extent_list 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.

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