get_nfe_batch

THE RISK

Low Risk

Why get_nfe_batch needs a policy

This tool retrieves the status of a fiscal batch (NF-e is Brazilian electronic invoice format). It performs a query/lookup operation to obtain status information without modifying, creating, deleting, or executing any financial transactions. The blast radius is minimal as it only exposes existing status data. No money moves and no state changes occur.

From the tool's definition Tool name is 'get_nfe_batch' and description states 'Get NF-e batch (lote) status by batch ID. Use for batch emissions.' The verb 'Get' and the context of retrieving batch status indicates a read-only query operation with no side effects.

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

POLICY

How to control get_nfe_batch

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 get_nfe_batch:

policy.json

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

get_nfe_batch 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.

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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_nfe_batch

What does the get_nfe_batch tool do? +

Get NF-e batch (lote) status by batch ID. Use for batch emissions. 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 get_nfe_batch? +

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

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

Can I rate-limit get_nfe_batch? +

Yes. Add a rate_limit block to the get_nfe_batch 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_nfe_batch completely? +

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

get_nfe_batch 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.

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