Get a summary of a budget month including income, budgeted amounts, and spending.
AI agents call ynab_get_month_summary to retrieve information from YNAB MCP Server 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 financial summary data (income, budgeted amounts, spending) without creating, modifying, deleting, or moving money. It is purely informational and has no side effects on the YNAB budget state. This is a clear Read operation. While the data is financial in nature, the tool itself does not commit financial obligations or move money, so Financial category does not apply.
From the tool's definition Tool name 'ynab_get_month_summary' and description 'Get a summary of a budget month including income, budgeted amounts, and spending' indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get a summary of a budget month including income, budgeted amounts, and spending. It is categorised as a Read tool in the YNAB MCP Server MCP Server, which means it retrieves data without modifying state.
Register the YNAB MCP Server MCP server in PolicyLayer and add a rule for ynab_get_month_summary: 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 MCP Server. Nothing to install.
ynab_get_month_summary 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 ynab_get_month_summary 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 ynab_get_month_summary. 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.
ynab_get_month_summary is provided by the YNAB MCP Server MCP server (wgdevelopment/ynab-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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