AI agents call list_invoices to retrieve information from Xendit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries invoice data without modifying, creating, deleting, or executing any state changes. It has no financial impact—it merely displays existing invoice records. The blast radius is minimal as misuse results only in unauthorized data visibility.
From the tool's definition Tool name 'list_invoices' combined with description 'List invoices with optional filters' indicates a retrieval operation. The verb 'list' and lack of any creation, modification, deletion, or financial transaction language confirm this is a read-only query.
Attacks that exploit this kind of access
List invoices with optional filters. It is categorised as a Read tool in the Xendit MCP Server, which means it retrieves data without modifying state.
Register the Xendit MCP server in PolicyLayer and add a rule for list_invoices: 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 Xendit. Nothing to install.
list_invoices 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 list_invoices 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 list_invoices. 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.
list_invoices is provided by the Xendit MCP server (theyahia/xendit-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →