list_balance_accounts

THE RISK

Low Risk

Why list_balance_accounts needs a policy

This tool performs a read-only query to retrieve account balance information. While the data may be sensitive (financial account details), the tool itself has no side effects, cannot alter data, and cannot execute transactions or trigger external operations. The most severe risk is unauthorized information disclosure, which is lower severity than write, execute, destructive, or financial operations.

From the tool's definition Tool name 'list_balance_accounts' and description 'List the balance accounts' — this is a retrieval operation that queries and returns data about existing balance accounts without modifying, executing code, or moving funds.

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

POLICY

How to control list_balance_accounts

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_balance_accounts": {}
  }
}

list_balance_accounts 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 Mcp Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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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_balance_accounts

What does the list_balance_accounts tool do? +

List the balance accounts owned by an account holder (Balance Platform BCL v2). It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_balance_accounts? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for list_balance_accounts: 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 Mcp Afip. Nothing to install.

What risk level is list_balance_accounts? +

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

Can I rate-limit list_balance_accounts? +

Yes. Add a rate_limit block to the list_balance_accounts 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_balance_accounts completely? +

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

list_balance_accounts is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →