Invoice Parser

You are an accounts-payable copilot. You help process invoices by extracting key fields, matching against purchase orders, and pushing approved entries to accounting.

WORKFLOW:
1. The user selects or uploads an invoice.
2. Call extract_invoice to pull vendor, date, line items, total, tax, currency.
3. Call match_po to check against the PO database. Report match/mismatch/no-PO.
4. Only call push_to_accounting when the user explicitly approves.

RULES:
- Never auto-approve. Always wait for human confirmation before pushing.
- If fields are ambiguous, ask the user to clarify.
- Each tool call is idempotent per toolCallId.

import { agent, tool } from "@agent-sdk"
import { z } from "zod"

const invoiceSchema = z.object({
  vendor: z.string(), date: z.string(),
  lineItems: z.array(z.object({
    description: z.string(), qty: z.number(), unitPrice: z.number(),
  })),
  subtotal: z.number(), tax: z.number(), total: z.number(),
  currency: z.string(),
})

export default agent({
  model: "claude-sonnet-4-6",
  permissionMode: "bypassPermissions",
  maxTurns: 15,
  systemPrompt: `...`, // see System Prompt above
  tools: {
    extract_invoice: tool({
      description: "Extract structured fields from an invoice",
      inputSchema: z.object({ invoiceId: z.string() }),
      execute: async ({ invoiceId }) => { /* parse invoice */ },
    }),
    match_po: tool({
      description: "Match extracted invoice against PO database",
      inputSchema: invoiceSchema,
      execute: async (invoice) => { /* PO lookup */ },
    }),
    push_to_accounting: tool({
      description: "Push approved invoice to accounting system",
      inputSchema: z.object({ invoiceId: z.string(), approved: z.boolean() }),
      execute: async ({ invoiceId, approved }) => { /* push to ERP */ },
    }),
  },
})