Product Price Monitor

Monitor a concrete purchasable item and alert on a normalized all-in price or availability condition. Handle variants, taxes, fees, currencies, stock, cancellation terms, and duplicate alerts explicitly. Setup runs once in the foreground; the recurring check runs as a cronjob tick (the price-watch automation blueprint scaffolds this).

When to Use

• "Alert me when this laptop drops below $1,000."
• "Watch these flights for a fare under $500."
• "Tell me when this hotel has a refundable room."
• "Track ticket/listing availability."
• A cron tick fires for an existing price watch (steps 4-6).

Don't use for: one-off "what does this cost right now" lookups (use web_search/web_extract directly).

Procedure — Setup (foreground, once)

1. Define the exact item

Record source URL/provider, product/listing ID where available, variant, quantity, location, dates, travelers/guests, membership/login assumptions, condition, seller, and acceptable substitutes. Done when two variants cannot be confused.