Get all transaction auto-categorization rules from Monarch Money. Returns a list of rules with their conditions and actions. Rules automatically categorize transactions based on merchant, amount, etc.
AI agents call get_transaction_rules to retrieve information from Monarch without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries existing transaction categorization rules from Monarch Money without modifying, deleting, or executing operations. It is a straightforward read operation that returns configuration data. No financial transactions are affected, and no data is created, modified, or deleted.
From the tool's definition Tool name 'get_transaction_rules' and description states it 'Get all transaction auto-categorization rules' and 'Returns a list of rules'. The verb 'Get' and 'Returns' indicate data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access get_transaction_rules gives an agent:
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 get_transaction_rules:
{
"version": "1",
"default": "deny",
"tools": {
"get_transaction_rules": {}
}
}get_transaction_rules is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get all transaction auto-categorization rules from Monarch Money. Returns a list of rules with their conditions and actions. Rules automatically categorize transactions based on merchant, amount, etc. It is categorised as a Read tool in the Monarch MCP Server, which means it retrieves data without modifying state.
Register the Monarch MCP server in PolicyLayer and add a rule for get_transaction_rules: 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.
get_transaction_rules is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_transaction_rules 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 get_transaction_rules. 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.
get_transaction_rules 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.
Deterministic rules across all 50 Monarch tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
50 Monarch tools catalogued and risk-classified — across an index of 42,500+ MCP servers.