AI agents call deleteDecks to permanently remove resources in Anki — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes Anki decks and their contents from the user's study data. Deletion is irreversible and causes loss of organized study materials. While not directly financial or affecting external systems, the blast radius is significant if an AI agent misuses it (e.g., deleting wrong decks).
From the tool's definition Tool name is 'deleteDecks' and description states it 'Deletes decks with the given names' - explicit deletion operation that removes data irreversibly.
Documented attack patterns abuse exactly the kind of access deleteDecks gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Anki, and nothing reaches the server without passing your rules. This is the rule we recommend for deleteDecks:
{
"version": "1",
"default": "deny",
"hide": [
"deleteDecks"
]
}deleteDecks 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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Deletes decks with the given names. The. It is categorised as a Destructive tool in the Anki MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Anki MCP server in PolicyLayer and add a rule for deleteDecks: 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 Anki. Nothing to install.
deleteDecks 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 deleteDecks 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 deleteDecks. 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.
deleteDecks is provided by the Anki MCP server (ujisati/anki-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Anki, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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40 Anki tools catalogued and risk-classified — across an index of 43,000+ MCP servers.