import_transactions · Ynab MCP: Risk & Policy

WHAT IT DOES

What import_transactions does on Ynab

AI agents use import_transactions to commit financial operations through Ynab — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why import_transactions needs a policy

This tool initiates a financial data operation by pulling transactions from linked bank/financial accounts into YNAB. While it doesn't directly move money, it triggers external financial institution connections and modifies the budget's transaction records by importing potentially large volumes of financial data.

From the tool's definition Trigger an import of transactions from linked financial institutions

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

import_transactions Approval-gated

Any call to import_transactions is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "import_transactions": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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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 Ynab, so you can run agents against it safely.

FAQ

Questions about import_transactions

What does the import_transactions tool do? +

[1 API call] Trigger an import of transactions from linked financial institutions. It is categorised as a Financial tool in the Ynab MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on import_transactions? +

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

What risk level is import_transactions? +

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

Can I rate-limit import_transactions? +

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

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

import_transactions is provided by the Ynab MCP server (justmytwospence/ynab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.