list_quotes

THE RISK

Low Risk

Why list_quotes needs a policy

This tool retrieves or queries existing swap quote data without creating, modifying, executing operations, or deleting anything. It is a read-only operation with no side effects. Severity is low because listing quotes poses minimal risk—the worst case is exposure of quote information the user is already authenticated to access.

From the tool's definition Tool name 'list_quotes' and description 'List recent swap quotes' indicate a retrieval operation with no modification or execution. The verb 'List' and phrase 'minted under the authenticated CDP account' describe querying stored data.

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

POLICY

How to control list_quotes

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_quotes:

policy.json

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

list_quotes 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_quotes

What does the list_quotes tool do? +

List recent swap quotes minted under the authenticated CDP account. Endpoint set provisional, expand once docs stabilize. 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_quotes? +

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

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

Can I rate-limit list_quotes? +

Yes. Add a rate_limit block to the list_quotes 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_quotes completely? +

Set action: deny in the PolicyLayer policy for list_quotes. 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_quotes? +

list_quotes 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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