cancel_downloads

THE RISK

Critical Risk

Why cancel_downloads needs a policy

Cancelling downloads removes them from the queue in a way that cannot be automatically undone; the data being downloaded is lost and would need to be re-queued. This is an irreversible destructive action on the download pipeline, with high blast radius if misused across multiple active downloads.

From the tool's definition cancel_downloads — cancels active downloads in Sonarr/Radarr/qBittorrent queues; cancellation of queued/active downloads is typically irreversible (the download must be re-added manually)

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

POLICY

How to control cancel_downloads

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

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "cancel_downloads"
  ]
}

cancel_downloads disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Critical-risk tools in Mediabox MCP → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about cancel_downloads

What does the cancel_downloads tool do? +

Manage Sonarr/Radarr/qBittorrent download queues. NOT for PyLoad — use download_status action=delete for PyLoad packages. It is categorised as a Destructive tool in the Mediabox MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on cancel_downloads? +

Register the Mediabox MCP server in PolicyLayer and add a rule for cancel_downloads: 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 Mediabox MCP. Nothing to install.

What risk level is cancel_downloads? +

cancel_downloads is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit cancel_downloads? +

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

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

cancel_downloads is provided by the Mediabox MCP server (juancmpdev/mediabox-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mediabox MCP tool call.

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

CHECK YOUR STACK →