list_prices

THE RISK

Low Risk

Why list_prices needs a policy

The tool retrieves or queries pricing information with filtering capabilities. It does not create, modify, delete, or execute any operations. While the server handles financial protocols, this specific tool only reads price data without committing financial obligations or triggering transactions.

From the tool's definition Tool name 'list_prices' and description 'List Prices. Filter by product, active flag, type (one_time/recurring), or currency.' indicate a query/retrieval operation with no modification of data.

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

POLICY

How to control list_prices

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_prices:

policy.json

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

list_prices 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Mcp Ap2 tools

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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_prices

What does the list_prices tool do? +

List Prices. Filter by product, active flag, type (one_time/recurring), or currency. 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_prices? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for list_prices: 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_prices? +

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

Can I rate-limit list_prices? +

Yes. Add a rate_limit block to the list_prices 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_prices completely? +

Set action: deny in the PolicyLayer policy for list_prices. 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_prices? +

list_prices 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.

CHECK YOUR STACK →