list_payment_sources

THE RISK

Low Risk

Why list_payment_sources needs a policy

This tool retrieves and queries payment source information for a customer without creating, modifying, deleting, or executing any side effects. It is a straightforward read operation on existing data. The low severity reflects that listing payment sources poses minimal risk even if accessed without authorization, as it does not enable unauthorized transactions or data destruction.

From the tool's definition Tool name 'list_payment_sources' and description 'List payment sources for a customer' indicate data retrieval with no modification. The verb 'list' is explicitly a read operation.

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

POLICY

How to control list_payment_sources

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_payment_sources:

policy.json

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

list_payment_sources 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

More Mcp Afip tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_payment Attempt to cancel a payment that has not yet settled. Iniciador endpoint: POST /payments/{ Financial cancel_payment_intent Cancel a payment intent that has not yet been captured. Fails on already-captured intents; Financial cancel_recurrence Cancel an active recurrence. Future charges will stop; already-charged cycles are untouche Financial cancel_subscription Cancel a subscription by ID Financial revoke_token Revoke an issued access_token or refresh_token at POST /v1/token/revoke. Use to terminate

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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_payment_sources

What does the list_payment_sources tool do? +

List payment sources for a customer. 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_payment_sources? +

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

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

Can I rate-limit list_payment_sources? +

Yes. Add a rate_limit block to the list_payment_sources 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_payment_sources completely? +

Set action: deny in the PolicyLayer policy for list_payment_sources. 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_payment_sources? +

list_payment_sources 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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