list-budgets · You Need A Budget (YNAB) MCP: Risk & Policy

WHAT IT DOES

What list-budgets does on You Need A Budget (YNAB) MCP

AI agents call list-budgets to retrieve information from You Need A Budget (YNAB) MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list-budgets needs a policy

This tool retrieves and enumerates budget metadata without creating, modifying, deleting, or moving money. It is a read-only query operation that returns information the user already has access to through the YNAB interface.

From the tool's definition Tool name 'list-budgets' and description 'List all available YNAB budgets' indicate a retrieval operation with no modification, deletion, or financial transaction capabilities.

Documented attack patterns abuse exactly the kind of access list-budgets gives an agent:

POLICY

How to control list-budgets

PolicyLayer is an MCP gateway — it sits between your AI agents and You Need A Budget (YNAB) MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list-budgets:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list-budgets": {}
  }
}

list-budgets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More You Need A Budget (YNAB) MCP tools

Destructive bulk-manage-transactions Create, update, or delete multiple transactions at once. More efficient than making single Write manage-budgeted-amount Assign a budgeted amount to a category or move money between categories for a specific mon Write manage-financial-overview Get, update, or refresh a high-level financial overview. This is the best starting point f Write manage-payees Merge multiple payee names into a single name. Use this to clean up payee data, for exampl Write manage-scheduled-transaction Create, update, or delete a single scheduled (recurring) transaction. Use this to manage r Read get-month-info Get detailed budget information for a single month, including age of money and total amoun Read list-accounts List all accounts for a given budget. Useful for getting account IDs for other tools. Read list-categories List all categories, groups, and their budgeting details for a given budget.

All 14 You Need A Budget (YNAB) MCP tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list-budgets

What does the list-budgets tool do? +

List all available YNAB budgets. It is categorised as a Read tool in the You Need A Budget (YNAB) MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list-budgets? +

Register the You Need A Budget (YNAB) MCP server in PolicyLayer and add a rule for list-budgets: 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 You Need A Budget (YNAB) MCP. Nothing to install.

What risk level is list-budgets? +

list-budgets is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list-budgets? +

Yes. Add a rate_limit block to the list-budgets 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 list-budgets completely? +

Set action: deny in the PolicyLayer policy for list-budgets. 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 list-budgets? +

list-budgets is provided by the You Need A Budget (YNAB) MCP server (jtewen/ynab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every You Need A Budget (YNAB) MCP tool call.

Start from You Need A Budget (YNAB) MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

Free to start. No card required.

14 You Need A Budget (YNAB) MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.