dataset_set_permissions

Set UNIX permissions on a dataset

SERVERTruenas SOURCEspranab/truenas-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/dataset-set-permissions.md

WHAT IT DOES

What dataset_set_permissions does on Truenas

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

RISK

Why dataset_set_permissions is rated Medium

This tool modifies permissions on a dataset, which is a reversible write operation. While permission changes can have serious security implications (potentially granting or revoking access), the operation itself is not destructive (permissions can be changed again) and does not delete or irreversibly alter data.

From the tool's definition Tool name 'dataset_set_permissions' and description 'Set UNIX permissions on a dataset' indicate modification of dataset access control metadata.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs dataset_set_permissions 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 dataset_set_permissions, this is the rule to start with:

dataset_set_permissions Rate-limited

dataset_set_permissions 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": {
    "dataset_set_permissions": {
      "limits": [
        {
          "counter": "dataset_set_permissions_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about dataset_set_permissions

What does the dataset_set_permissions tool do? +

Set UNIX permissions on a dataset. 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 dataset_set_permissions? +

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

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

Can I rate-limit dataset_set_permissions? +

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

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

dataset_set_permissions 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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