AI agents call get_month_money_movement_groups to retrieve information from Ynab without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves financial data (money movement groups) for reporting and analysis purposes. It has no side effects, does not modify state, and does not execute arbitrary operations. While it accesses financial information, the act of reading financial data carries minimal risk compared to tools that write, move money, or delete data.
From the tool's definition Tool name 'get_month_money_movement_groups' uses 'get' verb and description states 'Get money movement groups' with no mention of creation, modification, or deletion. It performs a single API call to retrieve data.
Attacks that exploit this kind of access
[1 API call] Get money movement groups for a specific month. It is categorised as a Read tool in the Ynab MCP Server, which means it retrieves data without modifying state.
Register the Ynab MCP server in PolicyLayer and add a rule for get_month_money_movement_groups: 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.
get_month_money_movement_groups 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_month_money_movement_groups 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_month_money_movement_groups. 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_month_money_movement_groups 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.
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