delete_transaction_rule

THE RISK

Critical Risk

This tool irreversibly deletes data (a transaction rule) from the Monarch Money system. Deletion operations cannot be undone and represent the most severe category of impact. While not as critical as deleting financial records themselves, rules govern transaction processing and their deletion could disrupt automated financial workflows.

From the tool's definition Tool name contains 'delete' and description states 'Delete a transaction rule.' The function permanently removes a transaction rule without reversibility.

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

HOW TO CONTROL DELETE_TRANSACTION_RULE

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

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_transaction_rule"
  ]
}

delete_transaction_rule disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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

RESTRICT THIS TOOL →

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EXPLORE

More Monarch tools

Destructive delete_transaction Delete a transaction from Monarch Money. Warning: This action cannot be undone. Destructive monarch_logout Clear the stored Monarch Money session from the system keyring. Execute refresh_accounts Request account data refresh from financial institutions. Args: account_ids: Write split_transaction Split a transaction into multiple parts with different categories/merchants. The sum Write bulk_categorize_transactions bulk_categorize_transactions Write add_transaction_tag Add a tag to a transaction, preserving any tags already on it. Args: transact Write categorize_transaction Assign a category to a transaction. Args: transaction_id: The ID of the trans Write create_transaction Create a new transaction in Monarch Money. Args: date: Transaction date in YY

All 50 Monarch tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in Monarch → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the delete_transaction_rule tool do? +

Delete a transaction rule. Args: rule_id: The ID of the rule to delete (use get_transaction_rules to find IDs) Returns: Confirmation of deletion. It is categorised as a Destructive tool in the Monarch MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on delete_transaction_rule? +

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

What risk level is delete_transaction_rule? +

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

Can I rate-limit delete_transaction_rule? +

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

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

delete_transaction_rule is provided by the Monarch MCP server (robcerda/monarch-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Monarch tool call.

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// WHAT DELETE_TRANSACTION_RULE ON MONARCH DOES

// THE RISK

// HOW TO CONTROL DELETE_TRANSACTION_RULE

// EXPLORE