upgrade_app · Truenas Ws MCP: Risk & Policy

WHAT IT DOES

What upgrade_app does on Truenas Ws

AI agents invoke upgrade_app to trigger actions in Truenas Ws. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why upgrade_app needs a policy

Upgrading an app triggers an external operation that changes the running state of a deployed application. It is not purely destructive (doesn't delete data) nor financial, but it executes a version change that could break functionality, cause downtime, or introduce incompatibilities — making it an Execute-category action with high severity due to potential service disruption.

From the tool's definition Upgrade an app to the latest available version

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upgrade_app Rate-limited

upgrade_app stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "upgrade_app": {
      "limits": [
        {
          "counter": "upgrade_app_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 upgrade_app

What does the upgrade_app tool do? +

Upgrade an app to the latest available version. It is categorised as a Execute tool in the Truenas Ws MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on upgrade_app? +

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

upgrade_app is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit upgrade_app? +

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

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

upgrade_app 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.