Know which overdue NetSuite customers to chase first

**Objective:** List customer receivables overdue as of {as-of-date} (default today), optionally for one {customer}, and rank who to chase first.

**Step 1: Pull the open items**

Call `netsuite-get-aropenitem` with `due-date.to` set to {as-of-date} and, if {customer} is given, `customer` set to it. Keep rows where the open amount (`amount` less `amount-applied`) is above zero. If {customer} matches nothing, say so and stop.

**Step 2: Add invoice context**

For the 10 customers with the largest overdue totals, call `netsuite-get-invoice` with `customer` set to the customer and `unpaid-amount.min` set to 0.01 to show the invoice numbers, `total` and `unpaid-amount`.

**Step 3: Report**

A table of customer, number of overdue items, total overdue, oldest due date and days overdue at {as-of-date}, sorted by total overdue descending. Under it, list the five largest individual items with document number and due date, then a two-line summary of total overdue and the share held by the top three customers.

**Rules & Guidelines:**

* This is a read-only job. Do not call any tool whose name starts with netsuite-add- or netsuite-update-, and never change, create or delete a record.
* Report only what the tools return. Do not estimate or invent figures; if a total is needed, add up the rows you actually retrieved and say so.
* If a read returns the maximum number of rows, say the result may be truncated and suggest narrowing the filters.
* Dates are YYYY-MM-DD. Where an input is blank, use the default stated in the Objective.

**Validation:**

* If a read returns nothing, say so and stop rather than guessing.
* If an input is ambiguous, list the candidates and ask which one is meant.