微信扫一扫Compare Prices
Search for a product across retailers in parallel using a hidden window, save pricing data incrementally to disk, and deliver a clean HTML comparison report with direct links to every product page.
When to Apply
Activate when the user asks to compare prices for a product, find the cheapest option, check if a price is good, or shop across multiple stores.
Workflow
Phase 1 — Clarify
Confirm with the user before searching:
- Product name — exact model, variant, size, or color if applicable
- Retailer preferences — any stores to include or exclude
- Region / currency — defaults to user's locale
Phase 2 — Set Up & Search
| Step | Tool | Detail |
|------|------|--------|
| Create output directory | evaluate_script | Create compare-<product-slug>/ in your working directory with a raw/ subfolder |
| Open hidden window | create_hidden_window | Dedicated workspace — keeps the user's browsing undisturbed |
| Open parallel tabs | new_hidden_page | Open up to 10 tabs concurrently, one per retailer/search |
Default search targets (adjust based on product type and user's region):
| Tab | Target |
|-----|--------|
| 1 | Google Shopping — https://www.google.com/search?tbm=shop&q=<product> |
| 2 | Amazon — https://www.amazon.com/s?k=<product> |
| 3 | Walmart — https://www.walmart.com/search?q=<product> |
| 4 | Best Buy — https://www.bestbuy.com/site/searchpage.jsp?st=<product> |
| 5 | Target — https://www.target.com/s?searchTerm=<product> |
| 6 | eBay — https://www.ebay.com/sch/i.html?_nkw=<product> |
| 7–10 | Additional retailers relevant to the product category (Newegg for tech, Home Depot for tools, etc.) |
Phase 3 — Extract & Save
For each tab, extract pricing data and save immediately:
| Step | Tool | Detail |
|------|------|--------|
| Navigate | navigate_page | Go to the search URL |
| Read results | get_page_content | Extract the search results page as markdown |
| Find best match | navigate_page | Click through to the most relevant product listing |
| Extract pricing | get_page_content | Pull the product page content — price, availability, shipping, seller |
| Save raw data | evaluate_script | Write to raw/<retailer>.json with all extracted fields (see format below) |
| Close tab | close_page | Free the tab after saving |
Never hold all retailer data in memory. Save each retailer's data to its own file immediately after extraction.
Raw Data Format (raw/<retailer>.json)
{
"retailer": "Amazon",
"product_name": "Product Title as Listed",
"product_url": "https://www.amazon.com/dp/...",
"price": 299.99,
"original_price": 349.99,
"currency": "USD",
"shipping": "Free",
"availability": "In Stock",
"seller": "Amazon.com",
"condition": "New",
"rating": "4.5/5",
"notes": "Prime eligible",
"extracted_at": "2025-03-11T10:30:00Z"
}
Phase 4 — HTML Report
After all retailers are processed, read the saved raw/*.json files and generate a self-contained report.html:
| Requirement | Detail |
|-------------|--------|
| Theme | Light background (#ffffff), clean sans-serif typography, generous whitespace |
| Header | Product name, search date, number of retailers checked |
| Best Deal banner | Highlighted card at the top showing the lowest total price with a direct link to the product page |
| Comparison table | All retailers sorted by total price (lowest first) with columns: Retailer, Price, Shipping, Total, Stock, Seller, Rating, Link |
| Product links | Every retailer name and a "View Deal" button must be a clickable <a href> linking to the actual product page URL |
| Price highlights | Lowest price in green, highest in muted gray. Show discount percentage if original price differs. |
| Self-contained | All styles in a <style> block — no external CSS or JS |
| Responsive | Readable on desktop and mobile |
| Footer | "Generated by BrowserOS Compare Prices" with date |
Use evaluate_script to write report.html to the output directory.
Phase 5 — Open & Notify
| Step | Tool | Detail |
|------|------|--------|
| Close hidden window | close_window | Clean up the research workspace |
| Open report | new_page | Open file://<path>/report.html in the user's active window |
| Notify user | — | Tell the user the comparison is complete, highlight the best deal, and provide the report path |
Tool Reference
| Category | Tools Used |
|----------|-----------|
| Window management | create_hidden_window, close_window |
| Tab management | new_hidden_page, close_page, new_page |
| Navigation | navigate_page |
| Content extraction | get_page_content |
| Data & file I/O | evaluate_script |
Tips
- Always compare total price (product + shipping), not just the listed price.
- Note the seller — marketplace third-party sellers may have different return policies than the retailer itself.
- Mention membership discounts (Prime, Walmart+) as a note, not as the default price.
- If the product has variants (sizes, colors), ensure every retailer is quoting the same variant.
- If a retailer blocks scraping or returns no results, skip it and note the gap in the report.
- For used/refurbished listings, separate them from new-condition results.