app_get

Get detailed information about a specific installed app by its ID (app name).

SERVERTruenas SOURCEspranab/truenas-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/app-get.md

WHAT IT DOES

What app_get does on Truenas

AI agents call app_get to retrieve information from Truenas without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why app_get is rated Low

This tool performs a simple query operation to fetch app metadata without side effects. It does not create, modify, delete, or execute anything—it only returns data about an installed application. The low severity reflects minimal blast radius from misuse: an agent could at worst enumerate installed apps, but cannot alter system state.

From the tool's definition Tool retrieves 'detailed information about a specific installed app' with no indication of modification, deletion, or execution capabilities. The verb 'Get' and action 'retrieves' clearly indicate a read-only operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

app_get Allowed

app_get is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "app_get": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about app_get

What does the app_get tool do? +

Get detailed information about a specific installed app by its ID (app name). It is categorised as a Read tool in the Truenas MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on app_get? +

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

app_get is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit app_get? +

Yes. Add a rate_limit block to the app_get 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_get completely? +

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

app_get 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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