list_topup_providers

THE RISK

Low Risk

Why list_topup_providers needs a policy

This tool queries and returns a list of telecom operators available for top-ups. It performs a read-only operation—retrieving data about providers without creating charges, executing payments, or modifying any state. The 'List' verb and lack of any side-effect language confirm it is a Read category tool.

From the tool's definition Tool name 'list_topup_providers' and description 'List telecom top-up providers' indicate a retrieval operation that returns available provider information with no modification or execution of transactions.

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

POLICY

How to control list_topup_providers

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for list_topup_providers:

policy.json

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

list_topup_providers 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 Ap2 — 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_topup_providers

What does the list_topup_providers tool do? +

List telecom top-up providers (operadoras) available for recargas. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_topup_providers? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for list_topup_providers: 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 Ap2. Nothing to install.

What risk level is list_topup_providers? +

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

Can I rate-limit list_topup_providers? +

Yes. Add a rate_limit block to the list_topup_providers 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_topup_providers completely? +

Set action: deny in the PolicyLayer policy for list_topup_providers. 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_topup_providers? +

list_topup_providers is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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