create_nfs_export · Truenas Ws MCP: Risk & Policy

WHAT IT DOES

What create_nfs_export does on Truenas Ws

AI agents use create_nfs_export to create or update resources in Truenas Ws — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Truenas Ws environment.

WHY IT NEEDS A POLICY

Why create_nfs_export needs a policy

Creating an NFS export adds a new network share configuration to TrueNAS, modifying the system's export table and network accessibility. This is reversible via deletion (as evidenced by the sibling 'delete_nfs_export' tool), making it Write rather than Destructive.

From the tool's definition Tool name 'create_nfs_export' and description 'Create a new NFS export' indicate data/configuration creation. Path requirement '/mnt/' confirms it operates on the storage system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_nfs_export Rate-limited

create_nfs_export 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Truenas Ws, so you can run agents against it safely.

FAQ

Questions about create_nfs_export

What does the create_nfs_export tool do? +

Create a new NFS export. Path must start with /mnt/. It is categorised as a Write tool in the Truenas Ws MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_nfs_export? +

Register the Truenas Ws MCP server in PolicyLayer and add a rule for create_nfs_export: 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 Ws. Nothing to install.

What risk level is create_nfs_export? +

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

Can I rate-limit create_nfs_export? +

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

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

create_nfs_export is provided by the Truenas Ws MCP server (thoriphes/truenas-ws-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.