List Sales Invoice records (ERPNext). franchisee filter assumes Sales Invoice has a custom franchisee link field; falls back to customer match if not. Status: Paid/Unpaid/Overdue/Submitted/etc. Dates ISO format.
AI agents call erpnext_list_invoices to retrieve information from Frappe MCP 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 with optional filtering by franchisee, status, and dates. It has no side effects, does not modify data, and does not execute code or trigger external operations.
From the tool's definition Tool description explicitly states 'List Sales Invoice records' and 'Read-only MCP server' in server description. The tool performs filtering and listing operations without modification capabilities.
Attacks that exploit this kind of access
List Sales Invoice records (ERPNext). franchisee filter assumes Sales Invoice has a custom franchisee link field; falls back to customer match if not. Status: Paid/Unpaid/Overdue/Submitted/etc. Dates ISO format. It is categorised as a Read tool in the Frappe MCP MCP Server, which means it retrieves data without modifying state.
Register the Frappe MCP server in PolicyLayer and add a rule for erpnext_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 Frappe MCP. Nothing to install.
erpnext_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 erpnext_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 erpnext_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.
erpnext_list_invoices is provided by the Frappe MCP server (tourscale-repos/frappe-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.
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