list_services_available

THE RISK

Low Risk

Why list_services_available needs a policy

This tool queries and returns information about available shipping services without creating, modifying, deleting, or executing any operations. It is a straightforward read-only operation that retrieves data for informational purposes, presenting minimal risk if misused by an AI agent.

From the tool's definition Tool name is 'list_services_available' and description states 'List available shipping services for a route' — a pure data retrieval operation with no modification, deletion, or execution.

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

POLICY

How to control list_services_available

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_services_available:

policy.json

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

list_services_available 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_services_available

What does the list_services_available tool do? +

List available shipping services for a route. 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_services_available? +

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

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

Can I rate-limit list_services_available? +

Yes. Add a rate_limit block to the list_services_available 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_services_available completely? +

Set action: deny in the PolicyLayer policy for list_services_available. 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_services_available? +

list_services_available 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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