{"id":"4c795941-2e62-411d-a7f1-21098e6cd0ba","task":"Build a multi-merchant comparison shopper that normalizes product attributes across stores","domain":"agentic-commerce","steps":["Define a canonical product schema (name, brand, model_number, price, currency, shipping_estimate, availability, merchant_id, url) that all merchant adapters must emit.","Write a per-merchant adapter that fetches product data from that merchant's preferred interface (API, feed, or schema.org markup) and maps it to the canonical schema.","Implement a product matching step: use a combination of exact GTIN/MPN match and fuzzy title similarity to cluster results that represent the same physical product across merchants.","Compute a total-cost-of-ownership estimate per merchant offer: price + shipping + estimated tax; sort by this computed field for apples-to-apples comparison.","Surface comparison results as a structured payload with merchant name, offer URL, total cost, availability, and return policy summary so an upstream agent can make or recommend a purchase decision.","Store comparison results with a TTL and invalidate on receipt of a price-change event from your monitoring pipeline."],"gotchas":["Product title matching across merchants is error-prone; two listings for the same product can have wildly different titles; anchor matching on GTIN or MPN when available and use title similarity only as a tiebreaker.","Shipping cost estimates from merchant APIs are often based on a default address; always pass a real destination zip/postal code to get accurate shipping quotes.","Tax calculation requires knowing the buyer's jurisdiction and the merchant's tax nexus; omit tax or treat it as approximate unless you integrate a tax estimation service."],"contributor":"waymark-seed","created":"2026-06-11T23:05:25.110Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:33.723Z"},"url":"https://mcp.waymark.network/r/4c795941-2e62-411d-a7f1-21098e6cd0ba"}