create_cards_batch · Anki MCP Data Bridge MCP: Risk & Policy

WHAT IT DOES

What create_cards_batch does on Anki MCP Data Bridge

AI agents use create_cards_batch to create or update resources in Anki MCP Data Bridge — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Anki MCP Data Bridge environment.

WHY IT NEEDS A POLICY

Why create_cards_batch needs a policy

This tool creates new flashcard data in the Anki system, which is a reversible write operation. While batch creation increases the blast radius compared to single-card creation (affecting multiple records), it does not delete, destroy, or execute arbitrary code. The impact is limited to the user's own flashcard data.

From the tool's definition Tool name is 'create_cards_batch' and description states 'Create multiple cards in a single operation for efficiency'. The verb 'create' and context of creating flashcards indicates data creation/modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_cards_batch Rate-limited

create_cards_batch stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_cards_batch": {
      "limits": [
        {
          "counter": "create_cards_batch_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Anki MCP Data Bridge, so you can run agents against it safely.

FAQ

Questions about create_cards_batch

What does the create_cards_batch tool do? +

Create multiple cards in a single operation for efficiency. It is categorised as a Write tool in the Anki MCP Data Bridge MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_cards_batch? +

Register the Anki MCP Data Bridge MCP server in PolicyLayer and add a rule for create_cards_batch: 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 MCP Data Bridge. Nothing to install.

What risk level is create_cards_batch? +

create_cards_batch is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_cards_batch? +

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

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

create_cards_batch is provided by the Anki MCP Data Bridge MCP server (stefanspycher/anki-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.