app_pull_images

Pull the latest Docker images for a specific app.

SERVERTruenas SOURCEspranab/truenas-mcp

High RISK CLASS

Category Execute

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-pull-images.md

WHAT IT DOES

What app_pull_images does on Truenas

AI agents invoke app_pull_images to trigger actions in Truenas. 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.

RISK

Why app_pull_images is rated High

Pulling Docker images triggers an external network operation that fetches and stores container images from a remote registry. This is not a simple read (it modifies local state by downloading/storing images) nor a pure write (it executes an external fetch operation with side effects dependent on remote registry state).

From the tool's definition Pull the latest Docker images for a specific app

Attacks that exploit this kind of access

RECOMMENDED RULE

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

app_pull_images Rate-limited

app_pull_images 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": {
    "app_pull_images": {
      "limits": [
        {
          "counter": "app_pull_images_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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_pull_images call is checked against it from then on.

FAQ

Questions about app_pull_images

What does the app_pull_images tool do? +

Pull the latest Docker images for a specific app. It is categorised as a Execute tool in the Truenas MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on app_pull_images? +

Register the Truenas MCP server in PolicyLayer and add a rule for app_pull_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_pull_images? +

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

Can I rate-limit app_pull_images? +

Yes. Add a rate_limit block to the app_pull_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_pull_images completely? +

Set action: deny in the PolicyLayer policy for app_pull_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_pull_images? +

app_pull_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.

KEEP EXPLORING

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