create_smb_share · Truenas Ws MCP: Risk & Policy

WHAT IT DOES

What create_smb_share does on Truenas Ws

AI agents use create_smb_share 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_smb_share needs a policy

This tool creates a new SMB share, which is a reversible configuration change that modifies the system's network-accessible resources. While not destructive (shares can be deleted), it goes beyond read-only retrieval and constitutes data/configuration write.

From the tool's definition Tool name is 'create_smb_share' and description states 'Create a new SMB share' — a create operation that modifies system configuration by establishing a new network share.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_smb_share Rate-limited

create_smb_share 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_smb_share": {
      "limits": [
        {
          "counter": "create_smb_share_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_smb_share

What does the create_smb_share tool do? +

Create a new SMB share. 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_smb_share? +

Register the Truenas Ws MCP server in PolicyLayer and add a rule for create_smb_share: 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_smb_share? +

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

Can I rate-limit create_smb_share? +

Yes. Add a rate_limit block to the create_smb_share 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_smb_share completely? +

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

create_smb_share 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.