iscsi_sessions

THE RISK

Low Risk

Why iscsi_sessions needs a policy

This tool retrieves information about active iSCSI sessions without modifying state, executing code, or affecting system resources. It is a read-only query operation with minimal blast radius if misused by an AI agent.

From the tool's definition Tool name 'iscsi_sessions' and description 'Get active iSCSI sessions' indicate data retrieval with no modification or execution.

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

POLICY

How to control iscsi_sessions

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_sessions:

policy.json

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

iscsi_sessions 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.
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FAQ

Questions about iscsi_sessions

What does the iscsi_sessions tool do? +

Get active iSCSI sessions. 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_sessions? +

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

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

Can I rate-limit iscsi_sessions? +

Yes. Add a rate_limit block to the iscsi_sessions 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_sessions completely? +

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

iscsi_sessions 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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