app_outdated_images

THE RISK

Low Risk

Why app_outdated_images needs a policy

This tool performs information retrieval about Docker images currently in use by applications. The verb 'list' explicitly indicates a read-only operation that gathers data about outdated images without modifying, executing, deleting, or creating anything.

From the tool's definition Tool name 'app_outdated_images' and description 'List outdated Docker images used by installed apps' indicate a query/retrieval operation with no modification of system state.

Documented attack patterns abuse exactly the kind of access app_outdated_images gives an agent:

POLICY

How to control app_outdated_images

PolicyLayer is an MCP gateway — it sits between your AI agents and Truenas, and nothing reaches the server without passing your rules. This is the rule we recommend for app_outdated_images:

policy.json

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

app_outdated_images is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Truenas — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about app_outdated_images

What does the app_outdated_images tool do? +

List outdated Docker images used by installed apps. 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_outdated_images? +

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

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

Can I rate-limit app_outdated_images? +

Yes. Add a rate_limit block to the app_outdated_images 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_outdated_images completely? +

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

app_outdated_images 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.

Enforce policy on every Truenas tool call.

Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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