[1 API call] Delete a transaction
AI agents call delete_transaction to permanently remove resources in Ynab — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly removes transaction records from a financial system, which cannot be recovered or undone. The blast radius is critical because deleted transactions directly affect account reconciliation, budget accuracy, tax records, and audit trails. A misused invocation could corrupt financial data with no recovery mechanism.
From the tool's definition Tool name is 'delete_transaction' with description 'Delete a transaction'. The verb 'delete' indicates irreversible removal of data.
Attacks that exploit this kind of access
[1 API call] Delete a transaction. It is categorised as a Destructive tool in the Ynab MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Ynab MCP server in PolicyLayer and add a rule for delete_transaction: 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.
delete_transaction 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 delete_transaction 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 delete_transaction. 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.
delete_transaction 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →