AI agents call cancelDownload to permanently remove resources in Download MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling a download typically removes the in-progress task and any partially downloaded data, which is generally irreversible (the task cannot be resumed after cancellation). Given the sibling tools include 'pauseDownload' and 'resumeDownload' as separate operations, 'cancelDownload' likely represents a permanent termination rather than a pause.
From the tool's definition Tool name 'cancelDownload' implies irreversible termination of a download task; description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access cancelDownload gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Download MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for cancelDownload:
{
"version": "1",
"default": "deny",
"hide": [
"cancelDownload"
]
}cancelDownload disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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cancelDownload. It is categorised as a Destructive tool in the Download MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Download MCP server in PolicyLayer and add a rule for cancelDownload: 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 Download MCP. Nothing to install.
cancelDownload is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the cancelDownload 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.
Set action: deny in the PolicyLayer policy for cancelDownload. 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.
cancelDownload is provided by the Download MCP server (shuakami/mcp-download). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Download MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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7 Download MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.