get_fees

THE RISK

Low Risk

Why get_fees needs a policy

This tool queries fee data for trading symbols. It performs no side effects, creates no transactions, executes no commands, and does not delete or move money. It is a simple data retrieval operation consistent with the Read category. Severity is low because misuse poses minimal risk—an agent could at worst retrieve fee information repeatedly, which has no harmful consequences.

From the tool's definition Tool name 'get_fees' and description 'Query trading fees (maker/taker) for a symbol' indicate a read-only operation that retrieves fee information without modifying state.

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

POLICY

How to control get_fees

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 get_fees:

policy.json

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

get_fees 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.

CAP THIS TOOL →

Free to start. No card required.

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 get_fees

What does the get_fees tool do? +

Query trading fees (maker/taker) for a symbol. 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 get_fees? +

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

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

Can I rate-limit get_fees? +

Yes. Add a rate_limit block to the get_fees 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 get_fees completely? +

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

get_fees 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.

CHECK YOUR STACK →