download · Yarr Media Stack MCP: Risk & Policy

WHAT IT DOES

What download does on Yarr Media Stack

AI agents invoke download to trigger actions in Yarr Media Stack. 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 download needs a policy

This tool initiates a download by sending a request to an external client (likely a Sonarr/Prowlarr download client). It executes an external operation whose effects depend on the arguments passed (e.g., which media to download). This is not merely writing metadata — it triggers real-world activity on external systems, consuming bandwidth, disk space, and potentially acquiring copyrighted content.

From the tool's definition "Send a download to the appropriate client" — triggers an external download operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

download Rate-limited

download 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": {
    "download": {
      "limits": [
        {
          "counter": "download_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 Yarr Media Stack, so you can run agents against it safely.

FAQ

Questions about download

What does the download tool do? +

Send a download to the appropriate client. It is categorised as a Execute tool in the Yarr Media Stack MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on download? +

Register the Yarr Media Stack MCP server in PolicyLayer and add a rule for download: 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 Yarr Media Stack. Nothing to install.

What risk level is download? +

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

Can I rate-limit download? +

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

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

download is provided by the Yarr Media Stack MCP server (mcpnexus-registry/yarr). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.