num_cards_due_today

THE RISK

Low Risk

Why num_cards_due_today needs a policy

This tool queries the count of due cards without modifying, executing, or deleting any data. It is a straightforward read-only operation that retrieves information from the Anki database. The minimal scope (just counting cards) and lack of any state-changing capability makes this low severity even if misused by an AI agent.

From the tool's definition Tool name 'num_cards_due_today' and description 'Get the number of cards due today' indicate a simple data retrieval operation with no side effects.

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

POLICY

How to control num_cards_due_today

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "num_cards_due_today": {}
  }
}

num_cards_due_today is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP-AnkiConnect tools

Write change_deck Move cards (by card ID) into a different deck. Write reschedule_cards Set due date, forget, or relearn one or more cards. Write set_suspended Suspend or unsuspend one or more cards. Write submit_reviews Submit answers for reviewed cards Write update_note_fields Modify the text content of one note's fields. Uses the same MathJax/code conversions as ad Write update_note_tags Add and/or remove tags on one or more notes. Read get_due_cards Get cards that are due for review Read inspect_cards View per-card state for given card IDs or note IDs. Sparse-fieldset selection via the prop

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about num_cards_due_today

What does the num_cards_due_today tool do? +

Get the number of cards due today. It is categorised as a Read tool in the MCP-AnkiConnect MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on num_cards_due_today? +

Register the MCP-AnkiConnect MCP server in PolicyLayer and add a rule for num_cards_due_today: 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 MCP-AnkiConnect. Nothing to install.

What risk level is num_cards_due_today? +

num_cards_due_today is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit num_cards_due_today? +

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

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

num_cards_due_today is provided by the MCP-AnkiConnect MCP server (samefarrar/mcp-ankiconnect). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-AnkiConnect tool call.

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

CHECK YOUR STACK →