Pause ads when a SKU runs out of stock. Resume on restock.

Describe it once.

You say:

Pause my ads whenever a SKU runs out of stock, and turn them back on when it's restocked.

Your agent writes the automation:

// Pause this SKU's product ads when its FBA stock reaches 0. Resume them on restock.
function handle(event, context) {
  const listing = context.listing;
  const marketplaceId = context.marketplace.marketplaceId;
  const stock = (event.Payload?.FulfillmentInventoryByMarketplace || []).find(
    (entry) => entry.MarketplaceId === marketplaceId,
  );
  if (!stock) return context;

  const available = stock.FulfillableQuantity;
  for (const ad of listing.ads) {
    if (available === 0 && ad.state === "enabled") {
      context.mutations.push({ target: ad, action: "update", payload: { state: "PAUSED" } });
    } else if (available > 0 && ad.state === "paused") {
      context.mutations.push({ target: ad, action: "update", payload: { state: "ENABLED" } });
    }
  }
  return context;
}

It runs on Amazon's inventory events, within seconds, day and night. Stock hits zero, that SKU's ads pause. A campaign can advertise several products, so this pauses the SKU's own product ads rather than the whole campaign. Stock comes back, ads resume. The code is yours: read it, edit it, or ask your agent to explain any line.

Amazon has rules. This is different.