list_balances

THE RISK

Low Risk

Why list_balances needs a policy

This tool retrieves and displays wallet balance information across addresses and networks. It performs no state changes, modifications, or destructive operations—it only queries existing data.

From the tool's definition Tool name 'list_balances' and description 'List the asset balances for a wallet' indicate a query operation that retrieves financial data without modifying it.

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

POLICY

How to control list_balances

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_balances:

policy.json

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

list_balances 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.

CAP THIS TOOL →

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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_balances

What does the list_balances tool do? +

List the asset balances for a wallet across all addresses + networks. Endpoint set provisional. 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_balances? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for list_balances: 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_balances? +

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

Can I rate-limit list_balances? +

Yes. Add a rate_limit block to the list_balances 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_balances completely? +

Set action: deny in the PolicyLayer policy for list_balances. 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_balances? +

list_balances 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 →