pool_update

Update pool properties (e.g. autotrim) or add vdevs

SERVERNasbridge SOURCEmaverick0628/nasbridge

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/nasbridge/pool-update.md

WHAT IT DOES

What pool_update does on Nasbridge

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

RISK

Why pool_update is rated Medium

This tool modifies TrueNAS storage pool configuration, which is a Write operation. While adding vdevs is a significant storage infrastructure change, it is reversible (vdevs can be removed or replaced). It does not delete data irreversibly (Destructive) nor triggers financial transactions (Financial).

From the tool's definition Tool name 'pool_update' and description 'Update pool properties (e.g. autotrim) or add vdevs' indicates reversible modification of storage pool configuration.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pool_update safely

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

pool_update Rate-limited

pool_update 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": {
    "pool_update": {
      "limits": [
        {
          "counter": "pool_update_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 Nasbridge, apply this rule, and every pool_update call is checked against it from then on.

FAQ

Questions about pool_update

What does the pool_update tool do? +

Update pool properties (e.g. autotrim) or add vdevs. It is categorised as a Write tool in the Nasbridge MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pool_update? +

Register the Nasbridge MCP server in PolicyLayer and add a rule for pool_update: 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 Nasbridge. Nothing to install.

What risk level is pool_update? +

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

Can I rate-limit pool_update? +

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

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

pool_update is provided by the Nasbridge MCP server (maverick0628/nasbridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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