query_blocklist

THE RISK

Low Risk

Why query_blocklist needs a policy

This tool performs a lookup or status check against a blocklist—a non-destructive, informational query with no ability to modify data, execute commands, or trigger financial transactions. It is clearly a Read category operation with low severity since misuse would only result in false positives/negatives in fraud detection, not data loss or unauthorized actions.

From the tool's definition Tool name 'query_blocklist' and description 'Check whether a value is currently on the Konduto blocklist' indicate a read-only query operation that retrieves blocklist status without modifying data or triggering side effects.

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

POLICY

How to control query_blocklist

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 query_blocklist:

policy.json

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

query_blocklist 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

Related tools and policies

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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 query_blocklist

What does the query_blocklist tool do? +

Check whether a value is currently on the Konduto blocklist. 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 query_blocklist? +

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

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

Can I rate-limit query_blocklist? +

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

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

query_blocklist 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 →