WEM Price Compare

Previous value: -"The retailer offers WEM holds for one catalogue product, current prices first and each group cheapest first. When `found` is false WEM simply does not hold this product yet — that is a normal answer, not a failure, and it says nothing about whether the product exists or what it costs. `nextTool` then names `search_products` and the query. An empty catalogue result is not a statement that the product is unavailable or unpriced."New value: +"The retailer offers WEM holds for one catalogue product: available current prices cheapest first, then current offers last seen out of stock, then older prices. When `found` is false WEM simply does not hold this product yet — that is a normal answer, not a failure, and it says nothing about whether the product exists or what it costs. `nextTool` then names `search_products` and the query. An empty catalogue result is not a statement that the product is unavailable or unpriced."

Previous value: -"Why the offers are in this order. Offers are ordered by price, lowest first; affiliate commission is not an input."New value: +"Why the offers are in this order. Available current offers are ordered by price, lowest first; current offers last seen out of stock and older prices follow. Affiliate commission is not an input."

Previous value: -"Empty when the vector path cannot rank (`semantic: false`), with `reason` naming which cause applies — they have different fixes, so do not read them all as an empty index. `semantic` is true only when pgvector actually ranked products."New value: +"Returns vector-ranked products when `semantic` is true. If that path is unavailable, relevant keyword-search rows may still be returned with `semantic: false` and `reason`; an empty result means neither path produced a safe match."

Previous value: -"Present when semantic is false, and never a judgement on the shopper query. `index_empty` — the vector query ran and matched nothing. `no_catalogue_client` / `no_embedding_key` — WEM is misconfigured, not the catalogue empty. `embedding_failed` / `query_failed` — an upstream call failed; retrying later may succeed. `timed_out` — an upstream call did not answer in time; this says nothing about the catalogue."New value: +"Present when semantic is false; it describes the vector path, not the fallback rows or shopper query. `index_empty` — the vector query ran and matched nothing. `no_catalogue_client` / `no_embedding_key` — WEM is misconfigured, not the catalogue empty. `embedding_failed` / `query_failed` — an upstream call failed; retrying later may succeed. `timed_out` — an upstream call did not answer in time; this says nothing about the catalogue."

Previous value: -"True only when the vector path actually ran."New value: +"True only when pgvector ranked these products. False products passed WEM keyword relevance checks instead."

Removed value: -[
-  {
-    "required": [
-      "gtin"
-    ]
-  },
-  {
-    "required": [
-      "slug"
-    ]
-  },
-  {
-    "required": [
-      "wem_id"
-    ]
-  },
-  {
-    "required": [
-      "title"
-    ]
-  }
-]

Removed value: -[
-  {
-    "required": [
-      "wem_id"
-    ]
-  },
-  {
-    "required": [
-      "provider",
-      "product_id"
-    ]
-  }
-]

Removed value: -[
-  {
-    "required": [
-      "gtin"
-    ]
-  },
-  {
-    "required": [
-      "slug"
-    ]
-  },
-  {
-    "required": [
-      "wem_id"
-    ]
-  },
-  {
-    "required": [
-      "provider",
-      "externalId"
-    ]
-  },
-  {
-    "required": [
-      "title"
-    ]
-  }
-]

Previous value: -"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."New value: +"Lowest CURRENT price in `offers` (priceStatus `current`) from a shop not out of stock when last checked. Null when there is none: never fill it from an older or undated row or a row with `inStock: false`."

Previous value: -"Lowest current indicative price (read within 14 days) at a named retailer in `currency`. Null when WEM holds the product only in another currency (see heldInCurrencies) — never convert one yourself — only as marketplace listings, or with no current price (see note)."New value: +"Lowest current indicative price (read within 14 days) at a named retailer in `currency`, from a shop not out of stock when last checked. Null when WEM holds the product only in another currency (see heldInCurrencies) — never convert one yourself — only as marketplace listings, or with no such price (see note)."

Previous value: -"Why a row is not found, unrecognised or not checked. Quote it rather than paraphrase."New value: +"Why a row is not found, unrecognised or not checked, or why a found row has no lowPrice. Quote it rather than paraphrase."

Previous value: -"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."New value: +"Lowest CURRENT price in `offers` (priceStatus `current`) from a shop not out of stock when last checked. Null when there is none: never fill it from an older or undated row or a row with `inStock: false`."

Previous value: -"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."New value: +"Lowest CURRENT price in `offers` (priceStatus `current`) from a shop not out of stock when last checked. Null when there is none: never fill it from an older or undated row or a row with `inStock: false`."

Previous value: -"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."New value: +"Lowest CURRENT price in `offers` (priceStatus `current`) from a shop not out of stock when last checked. Null when there is none: never fill it from an older or undated row or a row with `inStock: false`."

Previous value: -"The links from `offers`, cheapest first, pre-formatted. Give these to the user when you name a price from this result. Each opens the retailer’s page for the offer WEM priced; a retailer URL found elsewhere may be a different listing or price. The same links are in this array and, when a host renders one, in the card."New value: +"The links from `offers` in the same order, pre-formatted: current prices cheapest first, then any out of stock when last checked or not current, each saying so in its markdown. Give these to the user when you name a price from this result. Each opens the retailer’s page for the offer WEM priced; a retailer URL found elsewhere may be a different listing or price. The same links are in this array and, when a host renders one, in the card."

Previous value: -"Lowest CURRENT price in `offers` (read within 14 days). Null when no price is current or WEM holds none it may quote ; it is never taken from a stale or undated row, or from `unpriced`."New value: +"Lowest CURRENT price in `offers` (read within 14 days) from a shop not out of stock when last checked. Null when there is none, or WEM holds no price it may quote; it is never taken from a stale or undated row, a row with `inStock: false`, or `unpriced`."

Previous value: -"Current prices first (`priceStatus`), each group ascending by price; a stale or undated row is listed, never compared. Barcode, slug and WEM ID rows are the product. A title match is inferred; `identity.strength` says which."New value: +"Current prices first (`priceStatus`), then current prices from a shop out of stock when last checked (`inStock: false`), then stale or undated rows, each group ascending by price. Only the first group is compared: an out-of-stock, stale or undated row is listed, never the cheapest. Barcode, slug and WEM ID rows are the product. A title match is inferred; `identity.strength` says which."

Previous value: -"The links from `offers`, cheapest first, pre-formatted. Each opens the retailer’s page for the offer WEM priced; a retailer URL found elsewhere may be a different listing or price. The same links are in this array and, when a host renders one, in the card."New value: +"The links from `offers`, cheapest first, pre-formatted. Give these to the user when you name a price from this result. Each opens the retailer’s page for the offer WEM priced; a retailer URL found elsewhere may be a different listing or price. The same links are in this array and, when a host renders one, in the card."

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Added value: +{
+  "description": "The prices in this result as lines, cheapest first. Give these to the user when you name a price from this result. Each line opens the retailer page for that price; a retailer URL found elsewhere may be a different listing or price.",
+  "items": {
+    "properties": {
+      "currency": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "markdown": {
+        "description": "The same link as `[Retailer — £0.00](url)`, for hosts rendering markdown.",
+        "type": "string"
+      },
+      "price": {
+        "description": "Null when the row has no figure. The markdown then says where to see the price.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "retailer": {
+        "type": "string"
+      },
+      "url": {
+        "description": "The page this price was read on. The full URL; a shortened or rewritten form is a different link.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Added value: +{
+  "description": "The prices in this result as lines, cheapest first. Give these to the user when you name a price from this result. Each line opens the retailer page for that price; a retailer URL found elsewhere may be a different listing or price.",
+  "items": {
+    "properties": {
+      "currency": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "markdown": {
+        "description": "The same link as `[Retailer — £0.00](url)`, for hosts rendering markdown.",
+        "type": "string"
+      },
+      "price": {
+        "description": "Null when the row has no figure. The markdown then says where to see the price.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "retailer": {
+        "type": "string"
+      },
+      "url": {
+        "description": "The page this price was read on. The full URL; a shortened or rewritten form is a different link.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Added value: +{
+  "description": "The prices in this result as lines, cheapest first. Give these to the user when you name a price from this result. Each line opens the retailer page for that price; a retailer URL found elsewhere may be a different listing or price.",
+  "items": {
+    "properties": {
+      "currency": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "markdown": {
+        "description": "The same link as `[Retailer — £0.00](url)`, for hosts rendering markdown.",
+        "type": "string"
+      },
+      "price": {
+        "description": "Null when the row has no figure. The markdown then says where to see the price.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "retailer": {
+        "type": "string"
+      },
+      "url": {
+        "description": "The page this price was read on. The full URL; a shortened or rewritten form is a different link.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Added value: +{
+  "description": "The prices in this result as lines, cheapest first. Give these to the user when you name a price from this result. Each line opens the retailer page for that price; a retailer URL found elsewhere may be a different listing or price.",
+  "items": {
+    "properties": {
+      "currency": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "markdown": {
+        "description": "The same link as `[Retailer — £0.00](url)`, for hosts rendering markdown.",
+        "type": "string"
+      },
+      "price": {
+        "description": "Null when the row has no figure. The markdown then says where to see the price.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "retailer": {
+        "type": "string"
+      },
+      "url": {
+        "description": "The page this price was read on. The full URL; a shortened or rewritten form is a different link.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Added value: +{
+  "description": "The prices in this result as lines, cheapest first. Give these to the user when you name a price from this result. Each line opens the retailer page for that price; a retailer URL found elsewhere may be a different listing or price.",
+  "items": {
+    "properties": {
+      "currency": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "markdown": {
+        "description": "The same link as `[Retailer — £0.00](url)`, for hosts rendering markdown.",
+        "type": "string"
+      },
+      "price": {
+        "description": "Null when the row has no figure. The markdown then says where to see the price.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "retailer": {
+        "type": "string"
+      },
+      "url": {
+        "description": "The page this price was read on. The full URL; a shortened or rewritten form is a different link.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Previous value: -"aliexpress, or marketplace when mixed."New value: +"The marketplace (e.g. aliexpress), or marketplace when mixed."

Previous value: -"aliexpress, or marketplace when mixed."New value: +"The marketplace (e.g. aliexpress), or marketplace when mixed."

Previous value: -"Cheapest marketplace listing (AliExpress…), present only when it undercuts lowPrice or no named retailer holds the product. A seller’s price, not a retail floor: never quote it as the product’s price or the cheapest."New value: +"Cheapest marketplace listing (AliExpress, Temu…), present only when it undercuts lowPrice or no named retailer holds the product. A seller’s price, not a retail floor: never quote it as the product’s price or the cheapest."

Previous value: -"aliexpress, or marketplace when mixed."New value: +"The marketplace (e.g. aliexpress), or marketplace when mixed."

Previous value: -"ebay, aliexpress, or marketplace when mixed."New value: +"aliexpress, or marketplace when mixed."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"ebay, aliexpress, or marketplace when mixed."New value: +"aliexpress, or marketplace when mixed."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"Retailer source of the listing, as given in the search result (e.g. \"ebay\", \"awin\")."New value: +"Retailer source of the listing, as given in the search result (e.g. \"amazon\", \"awin\")."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"Cheapest marketplace listing (eBay, AliExpress…), present only when it undercuts lowPrice or no named retailer holds the product. A seller’s price, not a retail floor: never quote it as the product’s price or the cheapest."New value: +"Cheapest marketplace listing (AliExpress…), present only when it undercuts lowPrice or no named retailer holds the product. A seller’s price, not a retail floor: never quote it as the product’s price or the cheapest."

Previous value: -"Retailer sources to search live, e.g. [\"ebay\", \"awin\"]. Omit for all. Catalogue matches are not limited by it."New value: +"Retailer sources to search live, e.g. [\"amazon\", \"awin\"]. Omit for all. Catalogue matches are not limited by it."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"ebay, aliexpress, or marketplace when mixed."New value: +"aliexpress, or marketplace when mixed."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Previous value: -"That listing's own id (ASIN, eBay item number). Use with provider."New value: +"That listing's own id (an ASIN, or the shop's own item number). Use with provider."

Previous value: -"With externalId: the retailer source of a listing that identifies the product, e.g. 'amazon' or 'ebay'. To name the shop the claim is about, use `retailer`."New value: +"With externalId: the retailer source of a listing that identifies the product, e.g. 'amazon'. To name the shop the claim is about, use `retailer`."

Previous value: -"The retailer offers WEM holds for one catalogue product, current prices first and each group cheapest first. When `found` is false WEM simply does not hold this product yet — that is a normal answer, not a failure, and it says nothing about whether the product exists or what it costs. `nextTool` then names `search_products` and the query. An empty catalogue result is not a statement that the product is unavailable or unpriced; the live retailer search is a separate lookup and routinely finds supply this catalogue has not ingested."New value: +"The retailer offers WEM holds for one catalogue product, current prices first and each group cheapest first. When `found` is false WEM simply does not hold this product yet — that is a normal answer, not a failure, and it says nothing about whether the product exists or what it costs. `nextTool` then names `search_products` and the query. An empty catalogue result is not a statement that the product is unavailable or unpriced."

Previous value: -"Present only when `found` is false. It names `search_products` and the query. A named model that misses the catalogue is the ordinary case; the live search is a separate lookup."New value: +"Present only when `found` is false. It names `search_products` and the query. A named model that misses the catalogue is the ordinary case."

Previous value: -"Present when this result names no offer. `url` is WEM's results page for the query and `markdown` is the same link, pre-formatted. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."New value: +"Present when this result names no offer. `url` is WEM's results page for the query and `markdown` is the same link, pre-formatted. This tool reads the catalogue only, so an empty result here is not evidence the product is unavailable or unpriced."

Previous value: -"Present and true only when WEM could not reach its catalogue at all. `found` is false for the same reason it is on an ordinary miss, so the two are indistinguishable without this flag. When it is set, WEM does not know whether it holds the product. The lookup could not be completed; it does not mean WEM has no offers or no price for it. `nextTool` is still present, because the live retailer search does not depend on the catalogue."New value: +"Present and true only when WEM could not reach its catalogue at all. `found` is false for the same reason it is on an ordinary miss, so the two are indistinguishable without this flag. When it is set, WEM does not know whether it holds the product. The lookup could not be completed; it does not mean WEM has no offers or no price for it. `nextTool` is still present."

Previous value: -"Retailers currently enabled. WEM compares only feeds it is licensed to use."New value: +"Shops WEM has read a price from in the last 14 days, busiest first, at most 40: one row per shop, with how many of its products WEM read. Say which shops WEM covers from this list, never from a shop's absence: it is not every shop WEM has ever held, and a shop on it may not sell the product the shopper wants (compare_offers says which shops WEM holds for one product)."

Added value: +{
+  "description": "Products WEM read a price for at this shop in the last 14 days.",
+  "type": "integer"
+}

Added value: +{
+  "description": "How many shops WEM read a price from in the last 14 days, listed or not. Null with an empty `providers` means the list could not be read just now, not that WEM has no shops.",
+  "type": [
+    "integer",
+    "null"
+  ]
+}

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Previous value: -"ISO 4217 code for the shopper's market. Default GBP. Decides which market's offers WEM returns from its catalogue, not just how the answer reads — pass it explicitly, because WEM does not infer the market from IP. When WEM holds the product only in another currency it says so rather than presenting a foreign listing as the answer."New value: +"ISO 4217 code for the shopper's market. Default GBP. Decides which market's offers WEM returns from its catalogue, not just how the answer reads ; WEM does not infer the market from IP. When WEM holds the product only in another currency it says so rather than presenting a foreign listing as the answer."

Previous value: -"Product barcode: EAN-13, UPC-A, EAN-8 or GTIN-14. Preferred key."New value: +"Product barcode: EAN-13, UPC-A, EAN-8 or GTIN-14. The strongest identifier."

Previous value: -"Product or model name, or a bare MPN / merchant SKU (e.g. AF400UK). Weakest identifier — used only when no barcode, slug, or WEM ID is available. Same relevance gate as verify_offer; a miss means fall back to search_products, not a guess."New value: +"Product or model name, or an ASIN, MPN or merchant SKU (e.g. AF400UK). The weakest identifier: used only when no barcode, slug or WEM ID is given, and only if it passes a relevance check; otherwise `found` is false rather than a guess."

Previous value: -"Every verified retailer offer for one catalogue product, cheapest first. When `found` is false WEM simply does not hold this product yet — that is a normal answer, not a failure, and it says nothing about whether the product exists or what it costs. Call `search_products` with `nextTool.query` before telling the user anything; reporting \"WEM returns nothing\" without doing so is wrong, because the live retailer search routinely finds supply this catalogue has not ingested."New value: +"The retailer offers WEM holds for one catalogue product, current prices first and each group cheapest first. When `found` is false WEM simply does not hold this product yet — that is a normal answer, not a failure, and it says nothing about whether the product exists or what it costs. `nextTool` then names `search_products` and the query. An empty catalogue result is not a statement that the product is unavailable or unpriced; the live retailer search is a separate lookup and routinely finds supply this catalogue has not ingested."

Previous value: -"Present when surviving rows include a marketplace cluster at similar prices. That is not a retail floor — do not name the cheapest marketplace listing as the deal. The listings are still in the payload; give the user those links. If `next` points at the Chrome extension, send the shopper there for shops WEM does not yet hold as partners."New value: +"Present when surviving rows include a marketplace cluster at similar prices. That is not a retail floor — the cheapest marketplace listing is not the deal. The listings stay in the payload, each with its url. `next`, when present, is the Chrome extension page for shops WEM does not yet hold as partners."

Previous value: -"Present when this call hit its time budget and skipped enrichment. The offers returned are COMPLETE — only the extras were dropped. Do not report a missing catalogue block or missing observed retailers as WEM holding nothing, and do not retry automatically."New value: +"Present when this call hit its time budget and skipped enrichment. The offers returned are COMPLETE — only the extras were dropped. A missing catalogue block or missing observed retailers does not mean WEM holds nothing, and no retry is needed."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"Offers of this product WEM held back, tallied by reason. \"Priced far below this product’s other offers\" is a marketplace listing under 40% of what the product sells for elsewhere — the shape of a counterfeit, a part or a mislisted variant. Those prices are not in `offers`, `lowPrice`, `links`, `summary` or `priceHistory.low`: never quote one as the cheapest, a deal or the 90-day low. Say how many were held back."New value: +"Offers of this product WEM held back, tallied by reason. \"Priced far below this product’s other offers\" is a marketplace listing under 40% of what the product sells for elsewhere — the shape of a counterfeit, a part or a mislisted variant. Those prices are not in `offers`, `lowPrice`, `links`, `summary` or `priceHistory.low`: none is the cheapest, a deal or the 90-day low. The tally says how many were held back."

Previous value: -"False when the product is not in WEM’s catalogue. The rest of the fields below are then absent — do not read that as the product being unavailable or unpriced. Check `unavailable` before describing the result, then follow `nextTool`."New value: +"False when the product is not in WEM’s catalogue. The rest of the fields below are then absent ; that does not mean the product is unavailable or unpriced. `unavailable` distinguishes an outage from a miss. `nextTool`, when present, names the next lookup."

Previous value: -"How the shopper’s words reached this product. Decides how you describe the match: on `inferred`, say WEM matched it by name (not by barcode) and do not call the identity confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."New value: +"How the shopper’s words reached this product. On `inferred`, WEM matched it by name (not by barcode) and the identity is not confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."

Previous value: -"How this product’s offers are grouped — NOT how the shopper’s words found the product; that is `identity`. `barcode`: the product carries a GTIN, so every offer here is that same item. `curated-grouping`: it carries none, and the grouping is an inference. Never call a result a barcode match on the strength of this field: when `identity.strength` is `inferred`, say WEM matched the product by name."New value: +"How this product’s offers are grouped — NOT how the shopper’s words found the product; that is `identity`. `barcode`: the product carries a GTIN, so every offer here is that same item. `curated-grouping`: it carries none, and the grouping is an inference. This field does not make a result a barcode match: when `identity.strength` is `inferred`, WEM matched the product by name."

Previous value: -"When WEM last actually read any price in this answer. Null means none of them can be dated — say so rather than implying the answer is current."New value: +"When WEM last actually read any price in this answer. Null means none of them can be dated, so the answer is not current."

Previous value: -"The links from `offers`, cheapest first, pre-formatted to quote. Each opens the retailer’s page for the offer WEM priced; a retailer URL found elsewhere may be a different listing or price. State them in text even when the host renders a WEM card: the card may not reach the user."New value: +"The links from `offers`, cheapest first, pre-formatted. Each opens the retailer’s page for the offer WEM priced; a retailer URL found elsewhere may be a different listing or price. The same links are in this array and, when a host renders one, in the card."

Previous value: -"Null for a listing in `unpriced`: its markdown says \"see price at Amazon\", and so must you."New value: +"Null for a listing in `unpriced`. The markdown says \"see price at Amazon\" in place of a figure."

Previous value: -"WEM tracked redirect. Relay it exactly; never rewrite or shorten it."New value: +"WEM tracked redirect. The full URL; a shortened or rewritten form is a different link."

Previous value: -"Lowest CURRENT price in `offers` (read within 14 days). Null when no price is current or WEM holds none it may quote — never fill it from a stale or undated row, or from `unpriced`."New value: +"Lowest CURRENT price in `offers` (read within 14 days). Null when no price is current or WEM holds none it may quote ; it is never taken from a stale or undated row, or from `unpriced`."

Previous value: -"Where to send the shopper when WEM's set is thin. chrome_extension means compare the same product on any retailer page — WEM shows that price even without an affiliate programme."New value: +"Present when WEM's set of offers is thin. chrome_extension is a page that compares the same product on any retailer page, including shops without an affiliate programme."

Previous value: -"Present only when `found` is false: the call to make next, with the text to pass. This is the recovery path, not a suggestion — a named model that misses the catalogue is the ordinary case, and the live search is where its offers are."New value: +"Present only when `found` is false. It names `search_products` and the query. A named model that misses the catalogue is the ordinary case; the live search is a separate lookup."

Previous value: -"Current prices first (`priceStatus`), each group ascending by price; a stale or undated row is listed, never compared. Barcode, slug and WEM ID rows are the product. A title match is inferred — check identity.strength before stating it as exact."New value: +"Current prices first (`priceStatus`), each group ascending by price; a stale or undated row is listed, never compared. Barcode, slug and WEM ID rows are the product. A title match is inferred; `identity.strength` says which."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: it is undated, not current."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Null is undated, not current."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits ; `priceAgeDays` dates it."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Removed value: -{
-  "type": "boolean"
-}

Previous value: -"Product photo, served from wem3.ai. Null when none is available — do not substitute one."New value: +"Product photo, served from wem3.ai. Null when none is available."

Previous value: -"WEM ID of this active product. Omit when unknown; never invent one."New value: +"WEM ID of this active product. Null when unknown."

Previous value: -"Present only when `found` is false: which identifier missed, and why. When `unavailable` is true this describes the outage rather than a missing product — quote it as the reason the lookup failed, not as a fact about the product."New value: +"Present only when `found` is false: which identifier missed, and why. When `unavailable` is true this describes the outage rather than a missing product ; it is the reason the lookup failed, not a fact about the product."

Previous value: -"Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: never merge them into `offers`, never call one this product's lowest price or the best deal. On verify_offer they are not part of the check: `verdict`, `cheapest`, `betterBy`, `summary` and the receipt are about the product asked about, and a cheaper sister code never makes the claimed price wrong. Mention it as a separate line: quote `summary`, name the maker's page (`maker.host`) as the source, and link `url`, WEM's comparison for that model, not a shop. When `relation` is `differs`, name the `differences` and never call its price a saving. Absent is not evidence that no equivalent exists."New value: +"Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: they are not part of `offers`, and none is this product's lowest price or the best deal. On verify_offer they are not part of the check: `verdict`, `cheapest`, `betterBy`, `summary` and the receipt are about the product asked about, and a cheaper sister code never makes the claimed price wrong. `summary` is written to be quoted as it is. `maker.host` is the source of the claim. `url` is WEM's comparison for that model, not a shop. When `relation` is `differs`, the `differences` are what the maker says differs, and its price is not a saving. Absent is not evidence that no equivalent exists."

Previous value: -"The other model's cheapest named shop. Null when no named shop has an in-stock price for it. Give its age; never present it as current without one."New value: +"The other model's cheapest named shop. Null when no named shop has an in-stock price for it. `priceAgeDays` gives its age; without one it is not current."

Previous value: -"The maker's own page that says so: the proof. Cite it; WEM is not the source of the claim."New value: +"The maker's own page that says so: the proof. WEM is not the source of the claim."

Previous value: -"WEM's comparison for that model. Link this, not a shop."New value: +"WEM's comparison for that model, not a shop."

Previous value: -"Present when this result names no offer. GIVE THE USER THIS LINK — it is the answer when WEM has nothing else to say, and `markdown` is ready to paste. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."New value: +"Present when this result names no offer. `url` is WEM's results page for the query and `markdown` is the same link, pre-formatted. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."

Previous value: -"Present and true only when WEM could not reach its catalogue at all. `found` is false for the same reason it is on an ordinary miss, so the two are indistinguishable without this flag. When it is set, WEM does not know whether it holds the product: say the lookup could not be completed, never that WEM has no offers, no price, or does not stock it. Still call `nextTool` — the live retailer search does not depend on the catalogue."New value: +"Present and true only when WEM could not reach its catalogue at all. `found` is false for the same reason it is on an ordinary miss, so the two are indistinguishable without this flag. When it is set, WEM does not know whether it holds the product. The lookup could not be completed; it does not mean WEM has no offers or no price for it. `nextTool` is still present, because the live retailer search does not depend on the catalogue."

Previous value: -"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving."New value: +"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. The row carries `priceNote` (e.g. \"See price at Amazon\") in place of a figure. No price is stated, estimated or compared for one; it is not the cheapest and is not counted in a lowest price or a saving."

Previous value: -"What to show where a price would be, e.g. \"See price at Amazon\"."New value: +"What stands where a price would be, e.g. \"See price at Amazon\"."

Previous value: -"WEM tracked link. Relay it exactly."New value: +"WEM tracked link. The full URL; a shortened form is a different link."

Previous value: -"List of products to compare (2-5 items)"New value: +"2 to 5 listings, each with `provider` and `product_id` as given in a search result."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Added value: +{
+  "description": "Same effect as include_used: \"any\", \"used\" or \"refurbished\" also includes used and refurbished listings; any other value means new only.",
+  "type": "string"
+}

Previous value: -"Budget cap (GBP)"New value: +"Budget cap, in `currency`."

Previous value: -"What matters most (in order of importance)"New value: +"What matters most, in order. cheapest: lowest price. best_rated: higher rating. free_shipping: free delivery. fastest: states a delivery estimate. Weighed only where listings carry those details."

Previous value: -"Product name, barcode, ASIN, WEM ID, or wem3.ai/pl URL. A specific model should prefer compare_offers; this still resolves one if the host sends it here."New value: +"One kind of product or product: a name, barcode, ASIN, WEM ID or wem3.ai/pl URL. A single query, not a list."

Previous value: -"A null `recommendation` with `coverage.kind` marketplace_only still has listings in `alternatives` — give those links. A null with no alternatives is a genuine miss. Never soften a genuine miss into a suggestion."New value: +"A null `recommendation` with `coverage.kind` marketplace_only still has listings in `alternatives`. A null with no alternatives is a genuine miss. A genuine miss is not a suggestion."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"How the shopper’s words reached this product. Decides how you describe the match: on `inferred`, say WEM matched it by name (not by barcode) and do not call the identity confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."New value: +"How the shopper’s words reached this product. On `inferred`, WEM matched it by name (not by barcode) and the identity is not confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: it is undated, not current."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Null is undated, not current."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits ; `priceAgeDays` dates it."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving."New value: +"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. The row carries `priceNote` (e.g. \"See price at Amazon\") in place of a figure. No price is stated, estimated or compared for one; it is not the cheapest and is not counted in a lowest price or a saving."

Previous value: -"What to show where a price would be, e.g. \"See price at Amazon\"."New value: +"What stands where a price would be, e.g. \"See price at Amazon\"."

Previous value: -"WEM tracked link. Relay it exactly."New value: +"WEM tracked link. The full URL; a shortened form is a different link."

Previous value: -"Present when surviving rows include a marketplace cluster at similar prices. That is not a retail floor — do not name the cheapest marketplace listing as the deal. The listings are still in the payload; give the user those links. If `next` points at the Chrome extension, send the shopper there for shops WEM does not yet hold as partners."New value: +"Present when surviving rows include a marketplace cluster at similar prices. That is not a retail floor — the cheapest marketplace listing is not the deal. The listings stay in the payload, each with its url. `next`, when present, is the Chrome extension page for shops WEM does not yet hold as partners."

Previous value: -"Present when this call hit its time budget and skipped enrichment. The offers returned are COMPLETE — only the extras were dropped. Do not report a missing catalogue block or missing observed retailers as WEM holding nothing, and do not retry automatically."New value: +"Present when this call hit its time budget and skipped enrichment. The offers returned are COMPLETE — only the extras were dropped. A missing catalogue block or missing observed retailers does not mean WEM holds nothing, and no retry is needed."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"Where to send the shopper when WEM's set is thin. chrome_extension means compare the same product on any retailer page — WEM shows that price even without an affiliate programme."New value: +"Present when WEM's set of offers is thin. chrome_extension is a page that compares the same product on any retailer page, including shops without an affiliate programme."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Present when this result names no offer. GIVE THE USER THIS LINK — it is the answer when WEM has nothing else to say, and `markdown` is ready to paste. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."New value: +"Present when this result names no offer. `url` is WEM's results page for the query and `markdown` is the same link, pre-formatted. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."

Previous value: -"Receipt id, as returned on verify_offer as receipt.id (wem-evr-...)."New value: +"Receipt id (wem-evr- followed by 32 hex characters), as returned in a verify_offer result's receipt.id."

Previous value: -"Product ID from search results"New value: +"The listing's `id` from the search result."

Previous value: -"Provider name (e.g. \"ebay\", \"awin\")"New value: +"Retailer source of the listing, as given in the search result (e.g. \"ebay\", \"awin\")."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"WEM product page listing every retailer WEM holds. Relay it exactly."New value: +"WEM product page listing every retailer WEM holds. The full URL; a shortened form is a different link."

Previous value: -"not_found: WEM does not hold it yet — never say the product does not exist or has no price; look it up with compare_offers or search_products first. not_checked: not reached in this call, and not a miss. unrecognised: not an identifier this tool reads (product names go to compare_offers)."New value: +"not_found: WEM does not hold it yet — that is not a finding that the product does not exist or has no price. compare_offers and search_products are the lookups for it. not_checked: not reached in this call, and not a miss. unrecognised: not an identifier this tool reads (product names go to compare_offers)."

Previous value: -"Filter by category (electronics, fashion, beauty, home, sports, collectibles)"New value: +"Optional. Keeps only live retailer listings whose own category name matches this text exactly; catalogue matches ignore it. Leave it out unless the shopper names a retailer's category."

Added value: +{
+  "description": "ISO 4217 code for the shopper's market. Default GBP. Results and price filters use this currency.",
+  "type": "string"
+}

Previous value: -"Product barcode (EAN/UPC/GTIN) when the host already has one. Feed rows are matched on this before title."New value: +"A product barcode (EAN/UPC/GTIN) the host already has. When given, retailer sources are searched by this barcode instead of by the query words."

Previous value: -"Max results to return (default 10, max 30)"New value: +"How many listings to request from each retailer source (default 10, max 30). The combined list can hold more."

Previous value: -"Maximum price filter (GBP)"New value: +"Highest price to include, in `currency`. Applies to retailer listings, not to `catalogMatch`."

Previous value: -"Minimum price filter (GBP)"New value: +"Lowest price to include, in `currency`. Applies to retailer listings, not to `catalogMatch`."

Previous value: -"Limit to specific providers (e.g. [\"ebay\", \"awin\"]). Omit for all."New value: +"Retailer sources to search live, e.g. [\"ebay\", \"awin\"]. Omit for all. Catalogue matches are not limited by it."

Previous value: -"Product name, barcode (EAN/UPC/GTIN), ASIN, MPN, merchant SKU, WEM ID, wem3.ai/pl URL, or comma-separated IDs of those kinds."New value: +"A product name, or an identifier: barcode (EAN/UPC/GTIN), ASIN, MPN, merchant SKU, WEM ID or wem3.ai/pl URL. Several identifiers may be comma-separated."

Previous value: -"Sort order for results"New value: +"Order of the live retailer listings (default relevance). Not applied when the query identifies a product."

Previous value: -"How the shopper’s words reached this product. Decides how you describe the match: on `inferred`, say WEM matched it by name (not by barcode) and do not call the identity confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."New value: +"How the shopper’s words reached this product. On `inferred`, WEM matched it by name (not by barcode) and the identity is not confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: it is undated, not current."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Null is undated, not current."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits ; `priceAgeDays` dates it."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving."New value: +"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. The row carries `priceNote` (e.g. \"See price at Amazon\") in place of a figure. No price is stated, estimated or compared for one; it is not the cheapest and is not counted in a lowest price or a saving."

Previous value: -"What to show where a price would be, e.g. \"See price at Amazon\"."New value: +"What stands where a price would be, e.g. \"See price at Amazon\"."

Previous value: -"WEM tracked link. Relay it exactly."New value: +"WEM tracked link. The full URL; a shortened form is a different link."

Previous value: -"How the shopper’s words reached this product. Decides how you describe the match: on `inferred`, say WEM matched it by name (not by barcode) and do not call the identity confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."New value: +"How the shopper’s words reached this product. On `inferred`, WEM matched it by name (not by barcode) and the identity is not confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: it is undated, not current."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Null is undated, not current."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits ; `priceAgeDays` dates it."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving."New value: +"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. The row carries `priceNote` (e.g. \"See price at Amazon\") in place of a figure. No price is stated, estimated or compared for one; it is not the cheapest and is not counted in a lowest price or a saving."

Previous value: -"What to show where a price would be, e.g. \"See price at Amazon\"."New value: +"What stands where a price would be, e.g. \"See price at Amazon\"."

Previous value: -"WEM tracked link. Relay it exactly."New value: +"WEM tracked link. The full URL; a shortened form is a different link."

Previous value: -"Present when surviving rows include a marketplace cluster at similar prices. That is not a retail floor — do not name the cheapest marketplace listing as the deal. The listings are still in the payload; give the user those links. If `next` points at the Chrome extension, send the shopper there for shops WEM does not yet hold as partners."New value: +"Present when surviving rows include a marketplace cluster at similar prices. That is not a retail floor — the cheapest marketplace listing is not the deal. The listings stay in the payload, each with its url. `next`, when present, is the Chrome extension page for shops WEM does not yet hold as partners."

Previous value: -"Present when this call hit its time budget and skipped enrichment. The offers returned are COMPLETE — only the extras were dropped. Do not report a missing catalogue block or missing observed retailers as WEM holding nothing, and do not retry automatically."New value: +"Present when this call hit its time budget and skipped enrichment. The offers returned are COMPLETE — only the extras were dropped. A missing catalogue block or missing observed retailers does not mean WEM holds nothing, and no retry is needed."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"Where to send the shopper when WEM's set is thin. chrome_extension means compare the same product on any retailer page — WEM shows that price even without an affiliate programme."New value: +"Present when WEM's set of offers is thin. chrome_extension is a page that compares the same product on any retailer page, including shops without an affiliate programme."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Present when this result names no offer. GIVE THE USER THIS LINK — it is the answer when WEM has nothing else to say, and `markdown` is ready to paste. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."New value: +"Present when this result names no offer. `url` is WEM's results page for the query and `markdown` is the same link, pre-formatted. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."

Previous value: -"Present when the returned rows are different sizes and the query named none, so price ordering is meaningless: the cheapest row is cheapest because it is less of the product. Do NOT name a cheapest, a lowest price, or a best deal across these rows. State the size beside every price and ask the shopper which size they want. Where rows carry `unitPrice`, that is the like-for-like figure: quote it, and rank on it if the shopper asks which is better value. The rows are real — give the user those links."New value: +"Present when the returned rows are different sizes and the query named none, so price ordering is meaningless: the cheapest row is cheapest because it is less of the product. Do NOT name a cheapest, a lowest price, or a best deal across these rows. The size belongs beside every price. Where rows carry `unitPrice`, that is the like-for-like figure, and it is the figure to rank on when the question is which is better value. The rows are real listings, each with its url."

Previous value: -"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving."New value: +"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. The row carries `priceNote` (e.g. \"See price at Amazon\") in place of a figure. No price is stated, estimated or compared for one; it is not the cheapest and is not counted in a lowest price or a saving."

Previous value: -"What to show where a price would be, e.g. \"See price at Amazon\"."New value: +"What stands where a price would be, e.g. \"See price at Amazon\"."

Previous value: -"WEM tracked link. Relay it exactly."New value: +"WEM tracked link. The full URL; a shortened form is a different link."

Previous value: -"ISO 4217 code for the shopper's market: GBP (default) or USD. Promotions are regional, so this decides which retailers' offers are read."New value: +"ISO 4217 code for the shopper's market: GBP (default) or USD. Promotions are regional, so this decides which market's offers are read."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"WEM tracked redirect to the retailer’s promotion page. Relay it exactly; never rewrite it."New value: +"WEM tracked redirect to the retailer’s promotion page. The full URL; a shortened or rewritten form is a different link."

Previous value: -"Present when this result names no offer. GIVE THE USER THIS LINK — it is the answer when WEM has nothing else to say, and `markdown` is ready to paste. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."New value: +"Present when this result names no offer. `url` is WEM's results page for the query and `markdown` is the same link, pre-formatted. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."

Previous value: -"Matching promotions WEM did not show, by reason. codeNotPermitted and mentionsCode mean a checkout code WEM may not publish: the code may well exist — never say there is none."New value: +"Matching promotions WEM did not show, counted by reason: notPublishable (a checkout code or offer the retailer’s programme does not let WEM publish; the code may well exist), notJoined, notActive, outsideMarket, noTrackedLink, otherPublisherLink, incompleteRecord."

Previous value: -"Optional category filter"New value: +"Optional. Keeps only products whose feed category matches this text exactly."

Previous value: -"Natural language description of what the user is looking for"New value: +"Plain-language description of what the shopper needs."

Previous value: -"Max results (default 10, max 20)"New value: +"Max products to return (default 10, max 20)."

Previous value: -"Maximum price (GBP)"New value: +"Optional upper price bound, compared with each product's listed price (currencies are not converted)."

Previous value: -"Minimum price (GBP)"New value: +"Optional lower price bound, compared with each product's listed price (currencies are not converted)."

Added value: +{
+  "description": "Optional. Keeps only products from this partner feed, e.g. \"awin\".",
+  "type": "string"
+}

Previous value: -"How the shopper’s words reached this product. Decides how you describe the match: on `inferred`, say WEM matched it by name (not by barcode) and do not call the identity confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."New value: +"How the shopper’s words reached this product. On `inferred`, WEM matched it by name (not by barcode) and the identity is not confirmed, even when `identityBasis` is `barcode`; on `exact`, the barcode itself resolved it."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: it is undated, not current."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Null is undated, not current."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits ; `priceAgeDays` dates it."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving."New value: +"Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. The row carries `priceNote` (e.g. \"See price at Amazon\") in place of a figure. No price is stated, estimated or compared for one; it is not the cheapest and is not counted in a lowest price or a saving."

Previous value: -"What to show where a price would be, e.g. \"See price at Amazon\"."New value: +"What stands where a price would be, e.g. \"See price at Amazon\"."

Previous value: -"WEM tracked link. Relay it exactly."New value: +"WEM tracked link. The full URL; a shortened form is a different link."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"Where to send the shopper when WEM's set is thin. chrome_extension means compare the same product on any retailer page — WEM shows that price even without an affiliate programme."New value: +"Present when WEM's set of offers is thin. chrome_extension is a page that compares the same product on any retailer page, including shops without an affiliate programme."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Present when this result names no offer. GIVE THE USER THIS LINK — it is the answer when WEM has nothing else to say, and `markdown` is ready to paste. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."New value: +"Present when this result names no offer. `url` is WEM's results page for the query and `markdown` is the same link, pre-formatted. WEM searches retailers live on that page, including shops it holds no affiliate programme with, so an empty or withheld result here is not evidence the product is unavailable or unpriced."

Previous value: -"ISO 4217 code for the claimed price. Default GBP."New value: +"ISO 4217 code for the claimed price. Default GBP. Only offers in this currency are compared."

Previous value: -"The retailer's own product id (ASIN, eBay item number). Use with provider."New value: +"That listing's own id (ASIN, eBay item number). Use with provider."

Previous value: -"The price being claimed. Omit to ask only what the verified offers are."New value: +"The price being claimed. Omit to ask only for the observed offers."

Previous value: -"Retailer slug for the listing being checked, e.g. 'currys'."New value: +"With externalId: the retailer source of a listing that identifies the product, e.g. 'amazon' or 'ebay'. To name the shop the claim is about, use `retailer`."

Previous value: -"Retailer the price was claimed at — slug or display name."New value: +"The shop the price was claimed at, as a slug or display name. Omit to compare against every shop."

Previous value: -"Product title. Weakest identifier — used only when no id is available."New value: +"Product title. The weakest identifier: used only when no id is given, and only if it passes a relevance check."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: never merge them into `offers`, never call one this product's lowest price or the best deal. On verify_offer they are not part of the check: `verdict`, `cheapest`, `betterBy`, `summary` and the receipt are about the product asked about, and a cheaper sister code never makes the claimed price wrong. Mention it as a separate line: quote `summary`, name the maker's page (`maker.host`) as the source, and link `url`, WEM's comparison for that model, not a shop. When `relation` is `differs`, name the `differences` and never call its price a saving. Absent is not evidence that no equivalent exists."New value: +"Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: they are not part of `offers`, and none is this product's lowest price or the best deal. On verify_offer they are not part of the check: `verdict`, `cheapest`, `betterBy`, `summary` and the receipt are about the product asked about, and a cheaper sister code never makes the claimed price wrong. `summary` is written to be quoted as it is. `maker.host` is the source of the claim. `url` is WEM's comparison for that model, not a shop. When `relation` is `differs`, the `differences` are what the maker says differs, and its price is not a saving. Absent is not evidence that no equivalent exists."

Previous value: -"The other model's cheapest named shop. Null when no named shop has an in-stock price for it. Give its age; never present it as current without one."New value: +"The other model's cheapest named shop. Null when no named shop has an in-stock price for it. `priceAgeDays` gives its age; without one it is not current."

Previous value: -"The maker's own page that says so: the proof. Cite it; WEM is not the source of the claim."New value: +"The maker's own page that says so: the proof. WEM is not the source of the claim."

Previous value: -"WEM's comparison for that model. Link this, not a shop."New value: +"WEM's comparison for that model, not a shop."

Previous value: -"ISO 4217 code for the shopper's market. Default GBP. Decides which retailers are searched, not just how the answer reads — pass it explicitly, because WEM does not infer the market from IP. When WEM holds the product only in another currency it says so rather than presenting a foreign listing as the answer."New value: +"ISO 4217 code for the shopper's market. Default GBP. Decides which market's offers WEM returns from its catalogue, not just how the answer reads — pass it explicitly, because WEM does not infer the market from IP. When WEM holds the product only in another currency it says so rather than presenting a foreign listing as the answer."

Previous value: -"The tracked links from `offers`, cheapest first, pre-formatted to quote. Give these to the user when you name an offer: they carry the attribution WEM is funded by, and a retailer URL you compose yourself does not. Present even when the host renders a WEM card — never assume the card reached the user."New value: +"The links from `offers`, cheapest first, pre-formatted to quote. Each opens the retailer’s page for the offer WEM priced; a retailer URL found elsewhere may be a different listing or price. State them in text even when the host renders a WEM card: the card may not reach the user."

Added value: +"Highest current price in `offers`; null with lowPrice."

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

Added value: +"Null for a listing in `unpriced`: its markdown says \"see price at Amazon\", and so must you."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +"Lowest CURRENT price in `offers` (read within 14 days). Null when no price is current or WEM holds none it may quote — never fill it from a stale or undated row, or from `unpriced`."

Previous value: -"Ascending by price. Barcode, slug and WEM ID rows are the product. A title match is inferred — check identity.strength before stating it as exact."New value: +"Current prices first (`priceStatus`), each group ascending by price; a stale or undated row is listed, never compared. Barcode, slug and WEM ID rows are the product. A title match is inferred — check identity.strength before stating it as exact."

Previous value: -"When WEM last VISITED this offer row — not when it read the price. The refresh sweep touches this even when the retailer lookup fails, so it is not evidence the price is current. Use `priceAgeDays` to date a price; never this."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Previous value: -"Whole days since WEM last actually READ this price from the retailer or a datafeed. Null means WEM cannot say — common and correct for Amazon, whose licence caps price retention at 24 hours. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving.",
+  "items": {
+    "properties": {
+      "channel": {
+        "enum": [
+          "retailer",
+          "marketplace"
+        ],
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "priceNote": {
+        "description": "What to show where a price would be, e.g. \"See price at Amazon\".",
+        "type": "string"
+      },
+      "provider": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM tracked link. Relay it exactly.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."

Previous value: -"When WEM last VISITED this offer row — not when it read the price. The refresh sweep touches this even when the retailer lookup fails, so it is not evidence the price is current. Use `priceAgeDays` to date a price; never this."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Previous value: -"Whole days since WEM last actually READ this price from the retailer or a datafeed. Null means WEM cannot say — common and correct for Amazon, whose licence caps price retention at 24 hours. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving.",
+  "items": {
+    "properties": {
+      "channel": {
+        "enum": [
+          "retailer",
+          "marketplace"
+        ],
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "priceNote": {
+        "description": "What to show where a price would be, e.g. \"See price at Amazon\".",
+        "type": "string"
+      },
+      "provider": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM tracked link. Relay it exactly.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Previous value: -"Lowest indicative price at a named retailer in `currency`. Null when WEM holds the product only in another currency (see heldInCurrencies) — never convert one yourself — or only as marketplace listings."New value: +"Lowest current indicative price (read within 14 days) at a named retailer in `currency`. Null when WEM holds the product only in another currency (see heldInCurrencies) — never convert one yourself — only as marketplace listings, or with no current price (see note)."

Added value: +"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."

Previous value: -"When WEM last VISITED this offer row — not when it read the price. The refresh sweep touches this even when the retailer lookup fails, so it is not evidence the price is current. Use `priceAgeDays` to date a price; never this."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Previous value: -"Whole days since WEM last actually READ this price from the retailer or a datafeed. Null means WEM cannot say — common and correct for Amazon, whose licence caps price retention at 24 hours. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving.",
+  "items": {
+    "properties": {
+      "channel": {
+        "enum": [
+          "retailer",
+          "marketplace"
+        ],
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "priceNote": {
+        "description": "What to show where a price would be, e.g. \"See price at Amazon\".",
+        "type": "string"
+      },
+      "provider": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM tracked link. Relay it exactly.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."

Previous value: -"When WEM last VISITED this offer row — not when it read the price. The refresh sweep touches this even when the retailer lookup fails, so it is not evidence the price is current. Use `priceAgeDays` to date a price; never this."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Previous value: -"Whole days since WEM last actually READ this price from the retailer or a datafeed. Null means WEM cannot say — common and correct for Amazon, whose licence caps price retention at 24 hours. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving.",
+  "items": {
+    "properties": {
+      "channel": {
+        "enum": [
+          "retailer",
+          "marketplace"
+        ],
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "priceNote": {
+        "description": "What to show where a price would be, e.g. \"See price at Amazon\".",
+        "type": "string"
+      },
+      "provider": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM tracked link. Relay it exactly.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving.",
+  "items": {
+    "properties": {
+      "channel": {
+        "enum": [
+          "retailer",
+          "marketplace"
+        ],
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "priceNote": {
+        "description": "What to show where a price would be, e.g. \"See price at Amazon\".",
+        "type": "string"
+      },
+      "provider": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM tracked link. Relay it exactly.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +"Lowest CURRENT price in `offers` (priceStatus `current`). Null when none is current: never fill it from an older or undated row."

Previous value: -"When WEM last VISITED this offer row — not when it read the price. The refresh sweep touches this even when the retailer lookup fails, so it is not evidence the price is current. Use `priceAgeDays` to date a price; never this."New value: +"When WEM last READ this price from the retailer or a datafeed — the same reading `priceAgeDays` counts from, so the two always agree. Null means WEM cannot date the price: say it is undated, never that it is current."

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Previous value: -"Whole days since WEM last actually READ this price from the retailer or a datafeed. Null means WEM cannot say — common and correct for Amazon, whose licence caps price retention at 24 hours. Report null as undated; never present it as current."New value: +"Calendar days (UK time) since WEM last READ this price: 0 read today, 1 yesterday. Null means WEM cannot say. Report null as undated; never present it as current."

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Listings whose price WEM may not show — today, Amazon rows Amazon’s API did not price just now. Give the link with `priceNote` (\"See price at Amazon\"). Never state, estimate or compare a price for one, never call it the cheapest, and never count it in a lowest price or a saving.",
+  "items": {
+    "properties": {
+      "channel": {
+        "enum": [
+          "retailer",
+          "marketplace"
+        ],
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "priceNote": {
+        "description": "What to show where a price would be, e.g. \"See price at Amazon\".",
+        "type": "string"
+      },
+      "provider": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM tracked link. Relay it exactly.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Added value: +{
+  "additionalProperties": {
+    "type": "number"
+  },
+  "description": "Offers of this product WEM held back, tallied by reason. \"Priced far below this product’s other offers\" is a marketplace listing under 40% of what the product sells for elsewhere — the shape of a counterfeit, a part or a mislisted variant. Those prices are not in `offers`, `lowPrice`, `links`, `summary` or `priceHistory.low`: never quote one as the cheapest, a deal or the 90-day low. Say how many were held back.",
+  "type": [
+    "object",
+    "null"
+  ]
+}

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"Withheld candidates tallied by reason (e.g. accessories, wrong model). Report this count rather than implying the search was exhaustive."New value: +"Withheld candidates tallied by reason (e.g. accessories, another model, a bundle or multipack, a replica, a listing priced far below the product’s other offers). Report this count rather than implying the search was exhaustive, and never quote a withheld listing’s price as the cheapest or as a deal."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"Withheld candidates tallied by reason (e.g. accessories, wrong model). Report this count rather than implying the search was exhaustive."New value: +"Withheld candidates tallied by reason (e.g. accessories, another model, a bundle or multipack, a replica, a listing priced far below the product’s other offers). Report this count rather than implying the search was exhaustive, and never quote a withheld listing’s price as the cheapest or as a deal."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Previous value: -"Withheld candidates tallied by reason (e.g. accessories, wrong model). Report this count rather than implying the search was exhaustive."New value: +"Withheld candidates tallied by reason (e.g. accessories, another model, a bundle or multipack, a replica, a listing priced far below the product’s other offers). Report this count rather than implying the search was exhaustive, and never quote a withheld listing’s price as the cheapest or as a deal."

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Added value: +{
+  "description": "False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording.",
+  "type": "boolean"
+}

Added value: +{
+  "description": "False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording.",
+  "type": "boolean"
+}

Added value: +{
+  "description": "False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording.",
+  "type": "boolean"
+}

Added value: +"Prices WEM holds for this product, including indicative ones and shops it has no affiliate programme with yet. When `cheapest` is null, still show these rows and their links: they are a comparison, not a verification. Do not call them confirmed, and do not name a verified cheapest."

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `crawl` WEM reading the retailer’s own public product page, `none` nothing at all. `none` means the figure is frozen at whatever seeded it and will not move however long it sits — say so rather than quoting it flat. A `crawl` price was observed on the retailer’s page rather than supplied by them, so date it with `priceAgeDays` and expect `affiliate: false` unless a programme also exists."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."

Previous value: -[
-  "live-api",
-  "feed",
-  "crawl",
-  "none"
-]New value: +[
+  "live-api",
+  "feed",
+  "none"
+]

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `crawl` WEM reading the retailer’s own public product page, `none` nothing at all. `none` means the figure is frozen at whatever seeded it and will not move however long it sits — say so rather than quoting it flat. A `crawl` price was observed on the retailer’s page rather than supplied by them, so date it with `priceAgeDays` and expect `affiliate: false` unless a programme also exists."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."

Previous value: -[
-  "live-api",
-  "feed",
-  "crawl",
-  "none"
-]New value: +[
+  "live-api",
+  "feed",
+  "none"
+]

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `crawl` WEM reading the retailer’s own public product page, `none` nothing at all. `none` means the figure is frozen at whatever seeded it and will not move however long it sits — say so rather than quoting it flat. A `crawl` price was observed on the retailer’s page rather than supplied by them, so date it with `priceAgeDays` and expect `affiliate: false` unless a programme also exists."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."

Previous value: -[
-  "live-api",
-  "feed",
-  "crawl",
-  "none"
-]New value: +[
+  "live-api",
+  "feed",
+  "none"
+]

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `crawl` WEM reading the retailer’s own public product page, `none` nothing at all. `none` means the figure is frozen at whatever seeded it and will not move however long it sits — say so rather than quoting it flat. A `crawl` price was observed on the retailer’s page rather than supplied by them, so date it with `priceAgeDays` and expect `affiliate: false` unless a programme also exists."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."

Previous value: -[
-  "live-api",
-  "feed",
-  "crawl",
-  "none"
-]New value: +[
+  "live-api",
+  "feed",
+  "none"
+]

Previous value: -"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `crawl` WEM reading the retailer’s own public product page, `none` nothing at all. `none` means the figure is frozen at whatever seeded it and will not move however long it sits — say so rather than quoting it flat. A `crawl` price was observed on the retailer’s page rather than supplied by them, so date it with `priceAgeDays` and expect `affiliate: false` unless a programme also exists."New value: +"What re-reads this retailer’s prices: `live-api` a product-lookup API, `feed` a partner datafeed, `none` nothing on a schedule. `none` means the figure will not move on its own however long it sits — say so rather than quoting it flat, and date it with `priceAgeDays`."

Previous value: -[
-  "live-api",
-  "feed",
-  "crawl",
-  "none"
-]New value: +[
+  "live-api",
+  "feed",
+  "none"
+]

Previous value: -"Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: never merge them into `offers`, never call one this product's lowest price or the best deal, and never let one change a verify_offer verdict. Mention it as a separate line: quote `summary`, name the maker's page (`maker.host`) as the source, and link `url`, WEM's comparison for that model, not a shop. When `relation` is `differs`, name the `differences` and never call its price a saving. Absent means WEM holds no checked equivalent, not that none exists."New value: +"Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: never merge them into `offers`, never call one this product's lowest price or the best deal. On verify_offer they are not part of the check: `verdict`, `cheapest`, `betterBy`, `summary` and the receipt are about the product asked about, and a cheaper sister code never makes the claimed price wrong. Mention it as a separate line: quote `summary`, name the maker's page (`maker.host`) as the source, and link `url`, WEM's comparison for that model, not a shop. When `relation` is `differs`, name the `differences` and never call its price a saving. Absent is not evidence that no equivalent exists."

Added value: +{
+  "description": "Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: never merge them into `offers`, never call one this product's lowest price or the best deal. On verify_offer they are not part of the check: `verdict`, `cheapest`, `betterBy`, `summary` and the receipt are about the product asked about, and a cheaper sister code never makes the claimed price wrong. Mention it as a separate line: quote `summary`, name the maker's page (`maker.host`) as the source, and link `url`, WEM's comparison for that model, not a shop. When `relation` is `differs`, name the `differences` and never call its price a saving. Absent is not evidence that no equivalent exists.",
+  "items": {
+    "properties": {
+      "cheapest": {
+        "description": "The other model's cheapest named shop. Null when no named shop has an in-stock price for it. Give its age; never present it as current without one.",
+        "properties": {
+          "currency": {
+            "type": "string"
+          },
+          "price": {
+            "type": "number"
+          },
+          "priceAgeDays": {
+            "description": "Days since WEM read that price. Null means undated.",
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "shop": {
+            "type": "string"
+          }
+        },
+        "type": [
+          "object",
+          "null"
+        ]
+      },
+      "checkedOn": {
+        "description": "When a person at WEM read the maker’s page (YYYY-MM-DD).",
+        "type": "string"
+      },
+      "differences": {
+        "description": "What the maker says differs. Empty when identical.",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "maker": {
+        "description": "The maker's own page that says so: the proof. Cite it; WEM is not the source of the claim.",
+        "properties": {
+          "host": {
+            "type": "string"
+          },
+          "says": {
+            "description": "The page's words, as checked.",
+            "type": "string"
+          },
+          "url": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "model": {
+        "description": "The other model code, as the maker writes it.",
+        "type": "string"
+      },
+      "relation": {
+        "description": "`identical`: the maker says it is the same product. `differs`: the same product except `differences`; not like for like.",
+        "enum": [
+          "identical",
+          "differs"
+        ],
+        "type": "string"
+      },
+      "summary": {
+        "description": "WEM’s words for it, written to be quoted as they are.",
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM's comparison for that model. Link this, not a shop.",
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "model",
+      "relation",
+      "differences",
+      "maker",
+      "checkedOn",
+      "summary"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Present only when the maker's own page says another model code is this product and a person at WEM has checked it. These are NOT offers for the product asked about: never merge them into `offers`, never call one this product's lowest price or the best deal, and never let one change a verify_offer verdict. Mention it as a separate line: quote `summary`, name the maker's page (`maker.host`) as the source, and link `url`, WEM's comparison for that model, not a shop. When `relation` is `differs`, name the `differences` and never call its price a saving. Absent means WEM holds no checked equivalent, not that none exists.",
+  "items": {
+    "properties": {
+      "cheapest": {
+        "description": "The other model's cheapest named shop. Null when no named shop has an in-stock price for it. Give its age; never present it as current without one.",
+        "properties": {
+          "currency": {
+            "type": "string"
+          },
+          "price": {
+            "type": "number"
+          },
+          "priceAgeDays": {
+            "description": "Days since WEM read that price. Null means undated.",
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "shop": {
+            "type": "string"
+          }
+        },
+        "type": [
+          "object",
+          "null"
+        ]
+      },
+      "checkedOn": {
+        "description": "When a person at WEM read the maker’s page (YYYY-MM-DD).",
+        "type": "string"
+      },
+      "differences": {
+        "description": "What the maker says differs. Empty when identical.",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "maker": {
+        "description": "The maker's own page that says so: the proof. Cite it; WEM is not the source of the claim.",
+        "properties": {
+          "host": {
+            "type": "string"
+          },
+          "says": {
+            "description": "The page's words, as checked.",
+            "type": "string"
+          },
+          "url": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "model": {
+        "description": "The other model code, as the maker writes it.",
+        "type": "string"
+      },
+      "relation": {
+        "description": "`identical`: the maker says it is the same product. `differs`: the same product except `differences`; not like for like.",
+        "enum": [
+          "identical",
+          "differs"
+        ],
+        "type": "string"
+      },
+      "summary": {
+        "description": "WEM’s words for it, written to be quoted as they are.",
+        "type": "string"
+      },
+      "url": {
+        "description": "WEM's comparison for that model. Link this, not a shop.",
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "model",
+      "relation",
+      "differences",
+      "maker",
+      "checkedOn",
+      "summary"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Previous value: -"Present when the returned rows are different sizes and the query named none, so price ordering is meaningless: the cheapest row is cheapest because it is less of the product. Do NOT name a cheapest, a lowest price, or a best deal across these rows. State the size beside every price and ask the shopper which size they want. The rows are real — give the user those links."New value: +"Present when the returned rows are different sizes and the query named none, so price ordering is meaningless: the cheapest row is cheapest because it is less of the product. Do NOT name a cheapest, a lowest price, or a best deal across these rows. State the size beside every price and ask the shopper which size they want. Where rows carry `unitPrice`, that is the like-for-like figure: quote it, and rank on it if the shopper asks which is better value. The rows are real — give the user those links."

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}