get_market_trades

THE RISK

Low Risk

Why get_market_trades needs a policy

This tool retrieves historical trade information from a market, which is a passive data query operation. It does not create, modify, delete, execute code, or initiate financial transactions. While the server context (AFIP - Argentine tax authority) appears mismatched with financial market data, the tool itself is definitively a Read operation: it queries and returns historical data without side effects.

From the tool's definition The tool name 'get_market_trades' and description 'Get recent public trades for a market (trade history / tape)' indicate retrieval of historical market data with no modification or execution of operations.

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

POLICY

How to control get_market_trades

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_market_trades:

policy.json

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

get_market_trades 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 get_market_trades

What does the get_market_trades tool do? +

Get recent public trades for a market (trade history / tape). 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_market_trades? +

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

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

Can I rate-limit get_market_trades? +

Yes. Add a rate_limit block to the get_market_trades 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_market_trades completely? +

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

get_market_trades 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 →