app_create

Install a new app from the catalog. Provide the app_name (desired installation name), catalog_app (app from catalog), and optionally train, version, and configuration values.

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/app-create.md

WHAT IT DOES

What app_create does on Truenas

AI agents use app_create 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 app_create is rated Medium

This tool creates and installs new applications on the TrueNAS system, which is a reversible modification of system state (apps can be uninstalled). While it doesn't irreversibly delete data (Destructive) or execute arbitrary code (Execute), it does create new software components that could potentially execute code or access resources depending on what app is installed.

From the tool's definition Tool name 'app_create' and description 'Install a new app from the catalog' indicates creation of new application instances.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

app_create Rate-limited

app_create 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": {
    "app_create": {
      "limits": [
        {
          "counter": "app_create_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 app_create call is checked against it from then on.

FAQ

Questions about app_create

What does the app_create tool do? +

Install a new app from the catalog. Provide the app_name (desired installation name), catalog_app (app from catalog), and optionally train, version, and configuration values. 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 app_create? +

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

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

Can I rate-limit app_create? +

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

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

app_create 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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