list_external_accounts

THE RISK

Low Risk

Why list_external_accounts needs a policy

This tool queries and returns a list of external accounts associated with an operator. It performs a read-only data retrieval operation without creating, modifying, deleting, or executing any actions.

From the tool's definition Tool name 'list_external_accounts' and description 'List external accounts under the operator' indicate a retrieval operation with no modification or side effects.

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

POLICY

How to control list_external_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_external_accounts:

policy.json

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

list_external_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

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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_external_accounts

What does the list_external_accounts tool do? +

List external accounts under the operator. 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_external_accounts? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for list_external_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_external_accounts? +

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

Can I rate-limit list_external_accounts? +

Yes. Add a rate_limit block to the list_external_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_external_accounts completely? +

Set action: deny in the PolicyLayer policy for list_external_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_external_accounts? +

list_external_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.

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