Get the XML payload of an issued invoice (NF-e)
AI agents call get_invoice_xml to retrieve information from Mcp Ap2 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns the XML representation of an already-issued invoice. It performs a read-only query with no side effects, no execution of code, no deletions, and no financial transactions — it simply fetches existing invoice data. The low severity reflects minimal risk if misused, as invoice viewing does not alter system state or enable unauthorized payments.
From the tool's definition Tool name is 'get_invoice_xml' and description states 'Get the XML payload of an issued invoice (NF-e)' — the verb 'Get' and lack of any modification language indicate data retrieval only.
Documented attack patterns abuse exactly the kind of access get_invoice_xml gives an agent:
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_invoice_xml:
{
"version": "1",
"default": "deny",
"tools": {
"get_invoice_xml": {}
}
}get_invoice_xml is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the XML payload of an issued invoice (NF-e). It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for get_invoice_xml: 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.
get_invoice_xml is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_invoice_xml 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.
Set action: deny in the PolicyLayer policy for get_invoice_xml. 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.
get_invoice_xml 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.
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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1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.