BestPrice MCP

Compare BestPrice offers

compare_offers

Read-onlyIdempotent

Compares current Greek merchant offers for a BestPrice product ID and ranks them by total cost, item price, or merchant rating, returning prices, shipping, totals, and links.

Instructions

Compares current Greek merchant offers for one exact grouped BestPrice product ID. Returns public store names, item prices, shipping information, calculable delivered totals, ranking reasons, and BestPrice links. Without objective it ranks by lowest_total_cost when postal_code is given and by lowest_item_price otherwise, keeping shipping and total cost unknown; an explicit lowest_total_cost requires a Greek postcode (five digits, 10000 to 85999). Other ranking options include merchant rating. Catalog minimum prices and the lowest returned quoted prices have separate fields, with a reason when the catalog minimum is absent from the returned offers. Results exclude sponsored offers and merchant destination URLs. The operation is read-only and creates no CPC click.

Input Schema

Name	Required	Description
`limit`	No	Maximum number of current merchant offers to return, from 1 to 10.
`objective`	No	How to rank offers. When omitted: lowest_total_cost if postal_code is given, otherwise lowest_item_price. lowest_total_cost includes known shipping and requires postal_code.
`product_id`	Yes	Exact grouped BestPrice product id returned by search_products, in bp_<id> form.
`postal_code`	No	Greek delivery postcode (five digits, 10000 to 85999) used to calculate shipping and total cost. Required for lowest_total_cost; optional for lowest_item_price and merchant_rating.
`in_stock_only`	No	false (default): every buyable offer, whatever its delivery estimate (availability unknown stays marked unknown). true: only offers available now or delivered in 1 to 3 days; slower ones are held back and named in a warning. Offers shipping in 4 to 10 days are still buyable; true excludes them and can exclude the cheapest price. Out-of-stock offers are never returned.
`minimum_merchant_rating`	No	Optional minimum merchant rating on a 0 to 5 scale.

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed9 schema fields changedv2.8.1Oct 29, 2026

changedInput schema / properties / in_stock_only / description

Previous value: -"false (default): every buyable offer, both immediately available and those that ship later with a delivery estimate (availability unknown stays marked unknown). true: only offers immediately available from stock. Out-of-stock offers are never returned."New value: +"false (default): every buyable offer, whatever its delivery estimate (availability unknown stays marked unknown). true: only offers available now or delivered in 1 to 3 days; slower ones are held back and named in a warning. Offers shipping in 4 to 10 days are still buyable; true excludes them and can exclude the cheapest price. Out-of-stock offers are never returned."

changedOutput schema / $defs / __schema1 / pattern

Previous value: -"^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"New value: +"^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"

changedOutput schema / $defs / __schema12 / description

Previous value: -"Lowest item_price among the returned offers after public filters. Use this, not catalog_price_from, as a quoted item price."New value: +"Lowest quoted item_price among the returned offers after public filters; distinct from the indicative catalog_price_from."

addedOutput schema / $defs / __schema16 / properties / price_anomaly

Added value: +{
+  "$ref": "#/$defs/__schema19",
+  "description": "below_peer_price_range: item price is below 40% of the median of at least two other eligible offers. This listing remains inspectable but requires verification and is excluded from recommendations. Null means this peer-price check did not flag it; it is not a guarantee of price accuracy."
+}

addedOutput schema / $defs / __schema16 / properties / price_checked_at / description

Added value: +"When BestPrice retrieved this quote, not the merchant feed update time or a guarantee that the merchant price has not changed."

changedOutput schema / $defs / __schema16 / properties / shipping_unknown_cause / $ref
```
Previous value: -"#/$defs/__schema19"New value: +"#/$defs/__schema20"
```

changedOutput schema / $defs / __schema16 / properties / total_price / description

Previous value: -"Delivered total in EUR; null whenever shipping is unknown."New value: +"Item price plus published shipping in EUR; null whenever shipping is unknown. Floor delivery, installation, old-appliance removal, payment fees and additional remote-area charges are not verified by this quote."

changedOutput schema / $defs / __schema19 / anyOf

Previous value: -[
-  {
-    "enum": [
-      "missing",
-      "invalid"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "description": "Non-null anomaly codes require verification and exclude the listing from recommendations; treat unknown codes conservatively. Known values: below_peer_price_range. New values are added without a tools/list change.",
+    "maxLength": 100,
+    "pattern": "^[a-z][a-z0-9_]*$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedOutput schema / $defs / __schema20

Added value: +{
+  "anyOf": [
+    {
+      "enum": [
+        "missing",
+        "invalid"
+      ],
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

Changed24 schema fields changedv2.8.0Sep 26, 2026

removedOutput schema / $defs / __schema0 / const
```
Removed value: -"2.0"
```

addedOutput schema / $defs / __schema0 / description

Added value: +"Result schema version. Currently 2.0; a later <major>.<minor> is returned without a tools/list change."

addedOutput schema / $defs / __schema0 / pattern
```
Added value: +"^[1-9][0-9]*\\.[0-9]+$"
```

changedOutput schema / $defs / __schema14 / anyOf

Previous value: -[
-  {
-    "$ref": "#/$defs/__schema15"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "description": "Why catalog_price_from is absent from the returned page. Null when the catalog min is quoted or the page is cheaper. Known values: promoted, not_in_stock, missing_merchant, filtered, not_on_page, omitted_from_offer_list, no_catalog_price. New values are added without a tools/list change.",
+    "maxLength": 100,
+    "pattern": "^[a-z][a-z0-9_]*$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / $defs / __schema14 / description

Removed value: -"Why catalog_price_from is absent from the returned page. Null when the catalog min is quoted or the page is cheaper."

removedOutput schema / $defs / __schema15 / enum

Removed value: -[
-  "promoted",
-  "not_in_stock",
-  "missing_merchant",
-  "filtered",
-  "not_on_page",
-  "omitted_from_offer_list",
-  "no_catalog_price"
-]

addedOutput schema / $defs / __schema15 / items

Added value: +{
+  "$ref": "#/$defs/__schema16"
+}

addedOutput schema / $defs / __schema15 / maxItems
```
Added value: +10
```

changedOutput schema / $defs / __schema15 / type

Previous value: -"string"New value: +"array"

removedOutput schema / $defs / __schema16 / items

Removed value: -{
-  "$ref": "#/$defs/__schema17"
-}

removedOutput schema / $defs / __schema16 / maxItems
```
Removed value: -10
```

addedOutput schema / $defs / __schema16 / properties

Added value: +{
+  "availability": {
+    "description": "Offer availability; treat an unrecognized value as unknown. Known values: in_stock, delivery_1_3_days, delivery_4_7_days, delivery_4_10_days, delivery_8_14_days, by_order, to_order, preorder, out_of_stock, unknown. New values are added without a tools/list change.",
+    "maxLength": 100,
+    "pattern": "^[a-z][a-z0-9_]*$",
+    "type": "string"
+  },
+  "bundle_status": {
+    "enum": [
+      "single",
+      "bundle",
+      "unknown"
+    ],
+    "type": "string"
+  },
+  "certification_level": {
+    "$ref": "#/$defs/__schema18",
+    "description": "BestPrice certification tier of the store (php/classes/Merchant.php verification_level 1..4); null when not certified."
+  },
+  "condition": {
+    "description": "Item condition; treat an unrecognized value as unknown. Known values: new, refurbished, used, open_box, unknown. New values are added without a tools/list change.",
+    "maxLength": 100,
+    "pattern": "^[a-z][a-z0-9_]*$",
+    "type": "string"
+  },
+  "delivery_estimate": {
+    "anyOf": [
+      {
+        "maxLength": 80,
+        "minLength": 1,
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "item_price": {
+    "$ref": "#/$defs/__schema10",
+    "description": "Current item price in EUR before shipping."
+  },
+  "merchant_id": {
+    "pattern": "^bp_merchant_[0-9]+$",
+    "type": "string"
+  },
+  "merchant_logo_url": {
+    "$ref": "#/$defs/__schema17",
+    "description": "BestPrice CDN logo of the store; null when the store has none."
+  },
+  "merchant_name": {
+    "description": "Sanitized public BestPrice store name.",
+    "maxLength": 100,
+    "minLength": 1,
+    "type": "string"
+  },
+  "merchant_rating": {
+    "anyOf": [
+      {
+        "maximum": 5,
+        "minimum": 0,
+        "type": "number"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "merchant_rating_count": {
+    "anyOf": [
+      {
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "offer_id": {
+    "pattern": "^bp_offer_[0-9]+$",
+    "type": "string"
+  },
+  "offer_title": {
+    "maxLength": 220,
+    "minLength": 1,
+    "type": "string"
+  },
+  "price_checked_at": {
+    "$ref": "#/$defs/__schema1"
+  },
+  "ranking_reason": {
+    "maxLength": 100,
+    "minLength": 1,
+    "type": "string"
+  },
+  "shipping_price": {
+    "$ref": "#/$defs/__schema11",
+    "description": "Known or estimated shipping price in EUR; null means unknown."
+  },
+  "shipping_status": {
+    "enum": [
+      "known",
+      "estimated",
+      "unknown"
+    ],
+    "type": "string"
+  },
+  "shipping_unknown_cause": {
+    "$ref": "#/$defs/__schema19",
+    "description": "Why shipping is unknown: missing when the store published no usable shipping cost, invalid when it published one this service refuses to trust. Null whenever shipping_status is known or estimated."
+  },
+  "total_price": {
+    "$ref": "#/$defs/__schema11",
+    "description": "Delivered total in EUR; null whenever shipping is unknown."
+  },
+  "variant": {
+    "anyOf": [
+      {
+        "maxLength": 180,
+        "minLength": 1,
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "verified_merchant": {
+    "description": "True when this is a BestPrice-certified store (Πιστοποιημένο κατάστημα).",
+    "type": "boolean"
+  }
+}

addedOutput schema / $defs / __schema16 / required

Added value: +[
+  "offer_id",
+  "merchant_id",
+  "merchant_name",
+  "merchant_rating",
+  "merchant_rating_count",
+  "verified_merchant",
+  "offer_title",
+  "variant",
+  "item_price",
+  "shipping_price",
+  "shipping_status",
+  "total_price",
+  "availability",
+  "condition",
+  "bundle_status",
+  "delivery_estimate",
+  "ranking_reason",
+  "price_checked_at"
+]

changedOutput schema / $defs / __schema16 / type

Previous value: -"array"New value: +"object"

removedOutput schema / $defs / __schema17 / additionalProperties
```
Removed value: -false
```

addedOutput schema / $defs / __schema17 / anyOf

Added value: +[
+  {
+    "format": "uri",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / $defs / __schema17 / properties

Removed value: -{
-  "availability": {
-    "enum": [
-      "in_stock",
-      "delivery_1_3_days",
-      "delivery_4_7_days",
-      "delivery_4_10_days",
-      "delivery_8_14_days",
-      "by_order",
-      "to_order",
-      "preorder",
-      "out_of_stock",
-      "unknown"
-    ],
-    "type": "string"
-  },
-  "bundle_status": {
-    "enum": [
-      "single",
-      "bundle",
-      "unknown"
-    ],
-    "type": "string"
-  },
-  "certification_level": {
-    "$ref": "#/$defs/__schema19",
-    "description": "BestPrice certification tier of the store (php/classes/Merchant.php verification_level 1..4); null when not certified."
-  },
-  "condition": {
-    "enum": [
-      "new",
-      "refurbished",
-      "used",
-      "open_box",
-      "unknown"
-    ],
-    "type": "string"
-  },
-  "delivery_estimate": {
-    "anyOf": [
-      {
-        "maxLength": 80,
-        "minLength": 1,
-        "type": "string"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "item_price": {
-    "$ref": "#/$defs/__schema10",
-    "description": "Current item price in EUR before shipping."
-  },
-  "merchant_id": {
-    "pattern": "^bp_merchant_[0-9]+$",
-    "type": "string"
-  },
-  "merchant_logo_url": {
-    "$ref": "#/$defs/__schema18",
-    "description": "BestPrice CDN logo of the store; null when the store has none."
-  },
-  "merchant_name": {
-    "description": "Sanitized public BestPrice store name.",
-    "maxLength": 100,
-    "minLength": 1,
-    "type": "string"
-  },
-  "merchant_rating": {
-    "anyOf": [
-      {
-        "maximum": 5,
-        "minimum": 0,
-        "type": "number"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "merchant_rating_count": {
-    "anyOf": [
-      {
-        "maximum": 9007199254740991,
-        "minimum": 0,
-        "type": "integer"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "offer_id": {
-    "pattern": "^bp_offer_[0-9]+$",
-    "type": "string"
-  },
-  "offer_title": {
-    "maxLength": 220,
-    "minLength": 1,
-    "type": "string"
-  },
-  "price_checked_at": {
-    "$ref": "#/$defs/__schema1"
-  },
-  "ranking_reason": {
-    "maxLength": 100,
-    "minLength": 1,
-    "type": "string"
-  },
-  "shipping_price": {
-    "$ref": "#/$defs/__schema11",
-    "description": "Known or estimated shipping price in EUR; null means unknown."
-  },
-  "shipping_status": {
-    "enum": [
-      "known",
-      "estimated",
-      "unknown"
-    ],
-    "type": "string"
-  },
-  "shipping_unknown_cause": {
-    "$ref": "#/$defs/__schema20",
-    "description": "Why shipping is unknown: missing when the store published no usable shipping cost, invalid when it published one this service refuses to trust. Null whenever shipping_status is known or estimated."
-  },
-  "total_price": {
-    "$ref": "#/$defs/__schema11",
-    "description": "Delivered total in EUR; null whenever shipping is unknown."
-  },
-  "variant": {
-    "anyOf": [
-      {
-        "maxLength": 180,
-        "minLength": 1,
-        "type": "string"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "verified_merchant": {
-    "description": "True when this is a BestPrice-certified store (Πιστοποιημένο κατάστημα).",
-    "type": "boolean"
-  }
-}

removedOutput schema / $defs / __schema17 / required

Removed value: -[
-  "offer_id",
-  "merchant_id",
-  "merchant_name",
-  "merchant_rating",
-  "merchant_rating_count",
-  "verified_merchant",
-  "offer_title",
-  "variant",
-  "item_price",
-  "shipping_price",
-  "shipping_status",
-  "total_price",
-  "availability",
-  "condition",
-  "bundle_status",
-  "delivery_estimate",
-  "ranking_reason",
-  "price_checked_at"
-]

removedOutput schema / $defs / __schema17 / type
```
Removed value: -"object"
```

changedOutput schema / $defs / __schema18 / anyOf

Previous value: -[
-  {
-    "format": "uri",
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "bronze",
+      "silver",
+      "gold",
+      "platinum"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / $defs / __schema19 / anyOf

Previous value: -[
-  {
-    "enum": [
-      "bronze",
-      "silver",
-      "gold",
-      "platinum"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "missing",
+      "invalid"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / $defs / __schema20

Removed value: -{
-  "anyOf": [
-    {
-      "enum": [
-        "missing",
-        "invalid"
-      ],
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ]
-}

removedOutput schema / $defs / __schema6 / additionalProperties
```
Removed value: -false
```

changedOutput schema / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "as_of": {
-        "$ref": "#/$defs/__schema1"
-      },
-      "catalog_min_unquoted_reason": {
-        "$ref": "#/$defs/__schema14"
-      },
-      "catalog_price_from": {
-        "$ref": "#/$defs/__schema9"
-      },
-      "currency": {
-        "$ref": "#/$defs/__schema2"
-      },
-      "locale": {
-        "$ref": "#/$defs/__schema3"
-      },
-      "objective": {
-        "$ref": "#/$defs/__schema8"
-      },
-      "offers": {
-        "$ref": "#/$defs/__schema16"
-      },
-      "postal_code": {
-        "$ref": "#/$defs/__schema7"
-      },
-      "product": {
-        "$ref": "#/$defs/__schema6"
-      },
-      "quoted_lowest_item_price": {
-        "$ref": "#/$defs/__schema12"
-      },
-      "quoted_lowest_total_price": {
-        "$ref": "#/$defs/__schema13"
-      },
-      "schema_version": {
-        "$ref": "#/$defs/__schema0"
-      },
-      "warnings": {
-        "$ref": "#/$defs/__schema4"
-      }
-    },
-    "required": [
-      "schema_version",
-      "as_of",
-      "currency",
-      "locale",
-      "warnings",
-      "product",
-      "postal_code",
-      "objective",
-      "catalog_price_from",
-      "quoted_lowest_item_price",
-      "quoted_lowest_total_price",
-      "catalog_min_unquoted_reason",
-      "offers"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "as_of": {
-        "$ref": "#/$defs/__schema1"
-      },
-      "currency": {
-        "$ref": "#/$defs/__schema2"
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "pattern": "^[A-Z][A-Z0-9_]{2,63}$",
-            "type": "string"
-          },
-          "message": {
-            "maxLength": 240,
-            "minLength": 1,
-            "type": "string"
-          },
-          "retryable": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "code",
-          "message",
-          "retryable"
-        ],
-        "type": "object"
-      },
-      "locale": {
-        "$ref": "#/$defs/__schema3"
-      },
-      "schema_version": {
-        "$ref": "#/$defs/__schema0"
-      },
-      "warnings": {
-        "$ref": "#/$defs/__schema4"
-      }
-    },
-    "required": [
-      "schema_version",
-      "as_of",
-      "currency",
-      "locale",
-      "warnings",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "properties": {
+      "as_of": {
+        "$ref": "#/$defs/__schema1"
+      },
+      "catalog_min_unquoted_reason": {
+        "$ref": "#/$defs/__schema14"
+      },
+      "catalog_price_from": {
+        "$ref": "#/$defs/__schema9"
+      },
+      "currency": {
+        "$ref": "#/$defs/__schema2"
+      },
+      "locale": {
+        "$ref": "#/$defs/__schema3"
+      },
+      "objective": {
+        "$ref": "#/$defs/__schema8"
+      },
+      "offers": {
+        "$ref": "#/$defs/__schema15"
+      },
+      "postal_code": {
+        "$ref": "#/$defs/__schema7"
+      },
+      "product": {
+        "$ref": "#/$defs/__schema6"
+      },
+      "quoted_lowest_item_price": {
+        "$ref": "#/$defs/__schema12"
+      },
+      "quoted_lowest_total_price": {
+        "$ref": "#/$defs/__schema13"
+      },
+      "schema_version": {
+        "$ref": "#/$defs/__schema0"
+      },
+      "warnings": {
+        "$ref": "#/$defs/__schema4"
+      }
+    },
+    "required": [
+      "schema_version",
+      "as_of",
+      "currency",
+      "locale",
+      "warnings",
+      "product",
+      "postal_code",
+      "objective",
+      "catalog_price_from",
+      "quoted_lowest_item_price",
+      "quoted_lowest_total_price",
+      "catalog_min_unquoted_reason",
+      "offers"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "as_of": {
+        "$ref": "#/$defs/__schema1"
+      },
+      "currency": {
+        "$ref": "#/$defs/__schema2"
+      },
+      "error": {
+        "properties": {
+          "code": {
+            "pattern": "^[A-Z][A-Z0-9_]{2,63}$",
+            "type": "string"
+          },
+          "message": {
+            "maxLength": 240,
+            "minLength": 1,
+            "type": "string"
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable"
+        ],
+        "type": "object"
+      },
+      "locale": {
+        "$ref": "#/$defs/__schema3"
+      },
+      "schema_version": {
+        "$ref": "#/$defs/__schema0"
+      },
+      "warnings": {
+        "$ref": "#/$defs/__schema4"
+      }
+    },
+    "required": [
+      "schema_version",
+      "as_of",
+      "currency",
+      "locale",
+      "warnings",
+      "error"
+    ],
+    "type": "object"
+  }
+]

Changed8 schema fields changedv1.2.7Sep 24, 2026

changedInput schema / properties / in_stock_only / default
```
Previous value: -trueNew value: +false
```

changedInput schema / properties / in_stock_only / description

Previous value: -"When true, omit offers that are not currently available."New value: +"false (default): every buyable offer, both immediately available and those that ship later with a delivery estimate (availability unknown stays marked unknown). true: only offers immediately available from stock. Out-of-stock offers are never returned."

removedInput schema / properties / objective / default
```
Removed value: -"lowest_total_cost"
```

changedInput schema / properties / objective / description

Previous value: -"How to rank offers. Prefer lowest_total_cost because it includes known shipping."New value: +"How to rank offers. When omitted: lowest_total_cost if postal_code is given, otherwise lowest_item_price. lowest_total_cost includes known shipping and requires postal_code."

changedInput schema / properties / postal_code / description

Previous value: -"Five-digit Greek delivery postal code used to calculate shipping and total cost. Required for lowest_total_cost; optional for lowest_item_price and merchant_rating."New value: +"Greek delivery postcode (five digits, 10000 to 85999) used to calculate shipping and total cost. Required for lowest_total_cost; optional for lowest_item_price and merchant_rating."

changedInput schema / properties / postal_code / pattern

Previous value: -"^[0-9]{5}$"New value: +"^(?:[1-7][0-9]{4}|8[0-5][0-9]{3})$"

changedOutput schema / $defs / __schema7 / anyOf

Previous value: -[
-  {
-    "pattern": "^[0-9]{5}$",
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "pattern": "^(?:[1-7][0-9]{4}|8[0-5][0-9]{3})$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedOutput schema / $defs / __schema8 / description

Added value: +"The ranking actually applied, including the one resolved when the request omitted objective."

Changed2 schema fields changedv1.2.2Sep 22, 2026

addedOutput schema / $defs

Added value: +{
+  "__schema0": {
+    "const": "2.0",
+    "type": "string"
+  },
+  "__schema1": {
+    "format": "date-time",
+    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+    "type": "string"
+  },
+  "__schema10": {
+    "maximum": 10000000,
+    "minimum": 0,
+    "type": "number"
+  },
+  "__schema11": {
+    "anyOf": [
+      {
+        "$ref": "#/$defs/__schema10"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "__schema12": {
+    "$ref": "#/$defs/__schema11",
+    "description": "Lowest item_price among the returned offers after public filters. Use this, not catalog_price_from, as a quoted item price."
+  },
+  "__schema13": {
+    "$ref": "#/$defs/__schema11",
+    "description": "Lowest delivered total among returned offers with known shipping; null when none are known."
+  },
+  "__schema14": {
+    "anyOf": [
+      {
+        "$ref": "#/$defs/__schema15"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "description": "Why catalog_price_from is absent from the returned page. Null when the catalog min is quoted or the page is cheaper."
+  },
+  "__schema15": {
+    "enum": [
+      "promoted",
+      "not_in_stock",
+      "missing_merchant",
+      "filtered",
+      "not_on_page",
+      "omitted_from_offer_list",
+      "no_catalog_price"
+    ],
+    "type": "string"
+  },
+  "__schema16": {
+    "items": {
+      "$ref": "#/$defs/__schema17"
+    },
+    "maxItems": 10,
+    "type": "array"
+  },
+  "__schema17": {
+    "additionalProperties": false,
+    "properties": {
+      "availability": {
+        "enum": [
+          "in_stock",
+          "delivery_1_3_days",
+          "delivery_4_7_days",
+          "delivery_4_10_days",
+          "delivery_8_14_days",
+          "by_order",
+          "to_order",
+          "preorder",
+          "out_of_stock",
+          "unknown"
+        ],
+        "type": "string"
+      },
+      "bundle_status": {
+        "enum": [
+          "single",
+          "bundle",
+          "unknown"
+        ],
+        "type": "string"
+      },
+      "certification_level": {
+        "$ref": "#/$defs/__schema19",
+        "description": "BestPrice certification tier of the store (php/classes/Merchant.php verification_level 1..4); null when not certified."
+      },
+      "condition": {
+        "enum": [
+          "new",
+          "refurbished",
+          "used",
+          "open_box",
+          "unknown"
+        ],
+        "type": "string"
+      },
+      "delivery_estimate": {
+        "anyOf": [
+          {
+            "maxLength": 80,
+            "minLength": 1,
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "item_price": {
+        "$ref": "#/$defs/__schema10",
+        "description": "Current item price in EUR before shipping."
+      },
+      "merchant_id": {
+        "pattern": "^bp_merchant_[0-9]+$",
+        "type": "string"
+      },
+      "merchant_logo_url": {
+        "$ref": "#/$defs/__schema18",
+        "description": "BestPrice CDN logo of the store; null when the store has none."
+      },
+      "merchant_name": {
+        "description": "Sanitized public BestPrice store name.",
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      },
+      "merchant_rating": {
+        "anyOf": [
+          {
+            "maximum": 5,
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "merchant_rating_count": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "offer_id": {
+        "pattern": "^bp_offer_[0-9]+$",
+        "type": "string"
+      },
+      "offer_title": {
+        "maxLength": 220,
+        "minLength": 1,
+        "type": "string"
+      },
+      "price_checked_at": {
+        "$ref": "#/$defs/__schema1"
+      },
+      "ranking_reason": {
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      },
+      "shipping_price": {
+        "$ref": "#/$defs/__schema11",
+        "description": "Known or estimated shipping price in EUR; null means unknown."
+      },
+      "shipping_status": {
+        "enum": [
+          "known",
+          "estimated",
+          "unknown"
+        ],
+        "type": "string"
+      },
+      "shipping_unknown_cause": {
+        "$ref": "#/$defs/__schema20",
+        "description": "Why shipping is unknown: missing when the store published no usable shipping cost, invalid when it published one this service refuses to trust. Null whenever shipping_status is known or estimated."
+      },
+      "total_price": {
+        "$ref": "#/$defs/__schema11",
+        "description": "Delivered total in EUR; null whenever shipping is unknown."
+      },
+      "variant": {
+        "anyOf": [
+          {
+            "maxLength": 180,
+            "minLength": 1,
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "verified_merchant": {
+        "description": "True when this is a BestPrice-certified store (Πιστοποιημένο κατάστημα).",
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "offer_id",
+      "merchant_id",
+      "merchant_name",
+      "merchant_rating",
+      "merchant_rating_count",
+      "verified_merchant",
+      "offer_title",
+      "variant",
+      "item_price",
+      "shipping_price",
+      "shipping_status",
+      "total_price",
+      "availability",
+      "condition",
+      "bundle_status",
+      "delivery_estimate",
+      "ranking_reason",
+      "price_checked_at"
+    ],
+    "type": "object"
+  },
+  "__schema18": {
+    "anyOf": [
+      {
+        "format": "uri",
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "__schema19": {
+    "anyOf": [
+      {
+        "enum": [
+          "bronze",
+          "silver",
+          "gold",
+          "platinum"
+        ],
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "__schema2": {
+    "const": "EUR",
+    "type": "string"
+  },
+  "__schema20": {
+    "anyOf": [
+      {
+        "enum": [
+          "missing",
+          "invalid"
+        ],
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "__schema3": {
+    "const": "el-GR",
+    "type": "string"
+  },
+  "__schema4": {
+    "items": {
+      "$ref": "#/$defs/__schema5"
+    },
+    "maxItems": 20,
+    "type": "array"
+  },
+  "__schema5": {
+    "maxLength": 240,
+    "minLength": 1,
+    "type": "string"
+  },
+  "__schema6": {
+    "additionalProperties": false,
+    "properties": {
+      "bestprice_url": {
+        "format": "uri",
+        "type": "string"
+      },
+      "brand": {
+        "anyOf": [
+          {
+            "maxLength": 80,
+            "minLength": 1,
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "decision_id": {
+        "description": "Signed, anonymous id joining this recommendation to its BestPrice landing and outbound-click telemetry.",
+        "pattern": "^d1\\.[a-f0-9]{32}\\.[A-Za-z0-9_-]{43}$",
+        "type": "string"
+      },
+      "model": {
+        "maxLength": 220,
+        "minLength": 1,
+        "type": "string"
+      },
+      "product_id": {
+        "pattern": "^bp_[0-9]{10}$",
+        "type": "string"
+      },
+      "title": {
+        "maxLength": 220,
+        "minLength": 1,
+        "type": "string"
+      },
+      "variant": {
+        "anyOf": [
+          {
+            "maxLength": 180,
+            "minLength": 1,
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "product_id",
+      "title",
+      "brand",
+      "model",
+      "variant",
+      "decision_id",
+      "bestprice_url"
+    ],
+    "type": "object"
+  },
+  "__schema7": {
+    "anyOf": [
+      {
+        "pattern": "^[0-9]{5}$",
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "__schema8": {
+    "enum": [
+      "lowest_total_cost",
+      "lowest_item_price",
+      "merchant_rating"
+    ],
+    "type": "string"
+  },
+  "__schema9": {
+    "$ref": "#/$defs/__schema11",
+    "description": "Catalog lowest listed item price in EUR before shipping. Same identity as search_products.price_from. Not a buyable quote."
+  }
+}

changedOutput schema / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "as_of": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "catalog_min_unquoted_reason": {
-        "anyOf": [
-          {
-            "enum": [
-              "promoted",
-              "not_in_stock",
-              "missing_merchant",
-              "filtered",
-              "not_on_page",
-              "omitted_from_offer_list",
-              "no_catalog_price"
-            ],
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Why catalog_price_from is absent from the returned page. Null when the catalog min is quoted or the page is cheaper."
-      },
-      "catalog_price_from": {
-        "anyOf": [
-          {
-            "maximum": 10000000,
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Catalog lowest listed item price in EUR before shipping. Same identity as search_products.price_from. Not a buyable quote."
-      },
-      "currency": {
-        "const": "EUR",
-        "type": "string"
-      },
-      "locale": {
-        "const": "el-GR",
-        "type": "string"
-      },
-      "objective": {
-        "enum": [
-          "lowest_total_cost",
-          "lowest_item_price",
-          "merchant_rating"
-        ],
-        "type": "string"
-      },
-      "offers": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "availability": {
-              "enum": [
-                "in_stock",
-                "delivery_1_3_days",
-                "delivery_4_7_days",
-                "delivery_4_10_days",
-                "delivery_8_14_days",
-                "by_order",
-                "to_order",
-                "preorder",
-                "out_of_stock",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "bundle_status": {
-              "enum": [
-                "single",
-                "bundle",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "certification_level": {
-              "anyOf": [
-                {
-                  "enum": [
-                    "bronze",
-                    "silver",
-                    "gold",
-                    "platinum"
-                  ],
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "BestPrice certification tier of the store (php/classes/Merchant.php verification_level 1..4); null when not certified."
-            },
-            "condition": {
-              "enum": [
-                "new",
-                "refurbished",
-                "used",
-                "open_box",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "delivery_estimate": {
-              "anyOf": [
-                {
-                  "maxLength": 80,
-                  "minLength": 1,
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "item_price": {
-              "description": "Current item price in EUR before shipping.",
-              "maximum": 10000000,
-              "minimum": 0,
-              "type": "number"
-            },
-            "merchant_id": {
-              "pattern": "^bp_merchant_[0-9]+$",
-              "type": "string"
-            },
-            "merchant_logo_url": {
-              "anyOf": [
-                {
-                  "format": "uri",
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "BestPrice CDN logo of the store; null when the store has none."
-            },
-            "merchant_name": {
-              "description": "Sanitized public BestPrice store name.",
-              "maxLength": 100,
-              "minLength": 1,
-              "type": "string"
-            },
-            "merchant_rating": {
-              "anyOf": [
-                {
-                  "maximum": 5,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "merchant_rating_count": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": 0,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "offer_id": {
-              "pattern": "^bp_offer_[0-9]+$",
-              "type": "string"
-            },
-            "offer_title": {
-              "maxLength": 220,
-              "minLength": 1,
-              "type": "string"
-            },
-            "price_checked_at": {
-              "format": "date-time",
-              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-              "type": "string"
-            },
-            "ranking_reason": {
-              "maxLength": 100,
-              "minLength": 1,
-              "type": "string"
-            },
-            "shipping_price": {
-              "anyOf": [
-                {
-                  "maximum": 10000000,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "Known or estimated shipping price in EUR; null means unknown."
-            },
-            "shipping_status": {
-              "enum": [
-                "known",
-                "estimated",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "total_price": {
-              "anyOf": [
-                {
-                  "maximum": 10000000,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "Delivered total in EUR; null whenever shipping is unknown."
-            },
-            "variant": {
-              "anyOf": [
-                {
-                  "maxLength": 180,
-                  "minLength": 1,
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "verified_merchant": {
-              "description": "True when this is a BestPrice-certified store (Πιστοποιημένο κατάστημα).",
-              "type": "boolean"
-            }
-          },
-          "required": [
-            "offer_id",
-            "merchant_id",
-            "merchant_name",
-            "merchant_rating",
-            "merchant_rating_count",
-            "verified_merchant",
-            "offer_title",
-            "variant",
-            "item_price",
-            "shipping_price",
-            "shipping_status",
-            "total_price",
-            "availability",
-            "condition",
-            "bundle_status",
-            "delivery_estimate",
-            "ranking_reason",
-            "price_checked_at"
-          ],
-          "type": "object"
-        },
-        "maxItems": 10,
-        "type": "array"
-      },
-      "postal_code": {
-        "anyOf": [
-          {
-            "pattern": "^[0-9]{5}$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "product": {
-        "additionalProperties": false,
-        "properties": {
-          "bestprice_url": {
-            "format": "uri",
-            "type": "string"
-          },
-          "brand": {
-            "anyOf": [
-              {
-                "maxLength": 80,
-                "minLength": 1,
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "decision_id": {
-            "description": "Signed, anonymous id joining this recommendation to its BestPrice landing and outbound-click telemetry.",
-            "pattern": "^d1\\.[a-f0-9]{32}\\.[A-Za-z0-9_-]{43}$",
-            "type": "string"
-          },
-          "model": {
-            "maxLength": 220,
-            "minLength": 1,
-            "type": "string"
-          },
-          "product_id": {
-            "pattern": "^bp_[0-9]{10}$",
-            "type": "string"
-          },
-          "title": {
-            "maxLength": 220,
-            "minLength": 1,
-            "type": "string"
-          },
-          "variant": {
-            "anyOf": [
-              {
-                "maxLength": 180,
-                "minLength": 1,
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "product_id",
-          "title",
-          "brand",
-          "model",
-          "variant",
-          "decision_id",
-          "bestprice_url"
-        ],
-        "type": "object"
-      },
-      "quoted_lowest_item_price": {
-        "anyOf": [
-          {
-            "maximum": 10000000,
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Lowest item_price among the returned offers after public filters. Use this, not catalog_price_from, as a quoted item price."
-      },
-      "quoted_lowest_total_price": {
-        "anyOf": [
-          {
-            "maximum": 10000000,
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Lowest delivered total among returned offers with known shipping; null when none are known."
-      },
-      "schema_version": {
-        "const": "2.0",
-        "type": "string"
-      },
-      "warnings": {
-        "items": {
-          "maxLength": 240,
-          "minLength": 1,
-          "type": "string"
-        },
-        "maxItems": 20,
-        "type": "array"
-      }
-    },
-    "required": [
-      "schema_version",
-      "as_of",
-      "currency",
-      "locale",
-      "warnings",
-      "product",
-      "postal_code",
-      "objective",
-      "catalog_price_from",
-      "quoted_lowest_item_price",
-      "quoted_lowest_total_price",
-      "catalog_min_unquoted_reason",
-      "offers"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "as_of": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "currency": {
-        "const": "EUR",
-        "type": "string"
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "pattern": "^[A-Z][A-Z0-9_]{2,63}$",
-            "type": "string"
-          },
-          "message": {
-            "maxLength": 240,
-            "minLength": 1,
-            "type": "string"
-          },
-          "retryable": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "code",
-          "message",
-          "retryable"
-        ],
-        "type": "object"
-      },
-      "locale": {
-        "const": "el-GR",
-        "type": "string"
-      },
-      "schema_version": {
-        "const": "2.0",
-        "type": "string"
-      },
-      "warnings": {
-        "items": {
-          "maxLength": 240,
-          "minLength": 1,
-          "type": "string"
-        },
-        "maxItems": 20,
-        "type": "array"
-      }
-    },
-    "required": [
-      "schema_version",
-      "as_of",
-      "currency",
-      "locale",
-      "warnings",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "as_of": {
+        "$ref": "#/$defs/__schema1"
+      },
+      "catalog_min_unquoted_reason": {
+        "$ref": "#/$defs/__schema14"
+      },
+      "catalog_price_from": {
+        "$ref": "#/$defs/__schema9"
+      },
+      "currency": {
+        "$ref": "#/$defs/__schema2"
+      },
+      "locale": {
+        "$ref": "#/$defs/__schema3"
+      },
+      "objective": {
+        "$ref": "#/$defs/__schema8"
+      },
+      "offers": {
+        "$ref": "#/$defs/__schema16"
+      },
+      "postal_code": {
+        "$ref": "#/$defs/__schema7"
+      },
+      "product": {
+        "$ref": "#/$defs/__schema6"
+      },
+      "quoted_lowest_item_price": {
+        "$ref": "#/$defs/__schema12"
+      },
+      "quoted_lowest_total_price": {
+        "$ref": "#/$defs/__schema13"
+      },
+      "schema_version": {
+        "$ref": "#/$defs/__schema0"
+      },
+      "warnings": {
+        "$ref": "#/$defs/__schema4"
+      }
+    },
+    "required": [
+      "schema_version",
+      "as_of",
+      "currency",
+      "locale",
+      "warnings",
+      "product",
+      "postal_code",
+      "objective",
+      "catalog_price_from",
+      "quoted_lowest_item_price",
+      "quoted_lowest_total_price",
+      "catalog_min_unquoted_reason",
+      "offers"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "as_of": {
+        "$ref": "#/$defs/__schema1"
+      },
+      "currency": {
+        "$ref": "#/$defs/__schema2"
+      },
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "pattern": "^[A-Z][A-Z0-9_]{2,63}$",
+            "type": "string"
+          },
+          "message": {
+            "maxLength": 240,
+            "minLength": 1,
+            "type": "string"
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable"
+        ],
+        "type": "object"
+      },
+      "locale": {
+        "$ref": "#/$defs/__schema3"
+      },
+      "schema_version": {
+        "$ref": "#/$defs/__schema0"
+      },
+      "warnings": {
+        "$ref": "#/$defs/__schema4"
+      }
+    },
+    "required": [
+      "schema_version",
+      "as_of",
+      "currency",
+      "locale",
+      "warnings",
+      "error"
+    ],
+    "type": "object"
+  }
+]

Changed1 schema field changedv1.2.0Sep 8, 2026

changedOutput schema / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "as_of": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "catalog_min_unquoted_reason": {
-        "anyOf": [
-          {
-            "enum": [
-              "promoted",
-              "not_in_stock",
-              "missing_merchant",
-              "filtered",
-              "not_on_page",
-              "omitted_from_offer_list",
-              "no_catalog_price"
-            ],
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Why catalog_price_from is absent from the returned page. Null when the catalog min is quoted or the page is cheaper."
-      },
-      "catalog_price_from": {
-        "anyOf": [
-          {
-            "maximum": 10000000,
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Catalog lowest listed item price in EUR before shipping. Same identity as search_products.price_from. Not a buyable quote."
-      },
-      "currency": {
-        "const": "EUR",
-        "type": "string"
-      },
-      "locale": {
-        "const": "el-GR",
-        "type": "string"
-      },
-      "objective": {
-        "enum": [
-          "lowest_total_cost",
-          "lowest_item_price",
-          "merchant_rating"
-        ],
-        "type": "string"
-      },
-      "offers": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "availability": {
-              "enum": [
-                "in_stock",
-                "delivery_1_3_days",
-                "delivery_4_7_days",
-                "delivery_4_10_days",
-                "delivery_8_14_days",
-                "by_order",
-                "to_order",
-                "preorder",
-                "out_of_stock",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "bundle_status": {
-              "enum": [
-                "single",
-                "bundle",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "condition": {
-              "enum": [
-                "new",
-                "refurbished",
-                "used",
-                "open_box",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "delivery_estimate": {
-              "anyOf": [
-                {
-                  "maxLength": 80,
-                  "minLength": 1,
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "item_price": {
-              "description": "Current item price in EUR before shipping.",
-              "maximum": 10000000,
-              "minimum": 0,
-              "type": "number"
-            },
-            "merchant_id": {
-              "pattern": "^bp_merchant_[0-9]+$",
-              "type": "string"
-            },
-            "merchant_name": {
-              "description": "Sanitized public BestPrice store name.",
-              "maxLength": 100,
-              "minLength": 1,
-              "type": "string"
-            },
-            "merchant_rating": {
-              "anyOf": [
-                {
-                  "maximum": 5,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "merchant_rating_count": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": 0,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "offer_id": {
-              "pattern": "^bp_offer_[0-9]+$",
-              "type": "string"
-            },
-            "offer_title": {
-              "maxLength": 220,
-              "minLength": 1,
-              "type": "string"
-            },
-            "price_checked_at": {
-              "format": "date-time",
-              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-              "type": "string"
-            },
-            "ranking_reason": {
-              "maxLength": 100,
-              "minLength": 1,
-              "type": "string"
-            },
-            "shipping_price": {
-              "anyOf": [
-                {
-                  "maximum": 10000000,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "Known or estimated shipping price in EUR; null means unknown."
-            },
-            "shipping_status": {
-              "enum": [
-                "known",
-                "estimated",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "total_price": {
-              "anyOf": [
-                {
-                  "maximum": 10000000,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "Delivered total in EUR; null whenever shipping is unknown."
-            },
-            "variant": {
-              "anyOf": [
-                {
-                  "maxLength": 180,
-                  "minLength": 1,
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "verified_merchant": {
-              "description": "True when this is a BestPrice-certified store (Πιστοποιημένο κατάστημα).",
-              "type": "boolean"
-            }
-          },
-          "required": [
-            "offer_id",
-            "merchant_id",
-            "merchant_name",
-            "merchant_rating",
-            "merchant_rating_count",
-            "verified_merchant",
-            "offer_title",
-            "variant",
-            "item_price",
-            "shipping_price",
-            "shipping_status",
-            "total_price",
-            "availability",
-            "condition",
-            "bundle_status",
-            "delivery_estimate",
-            "ranking_reason",
-            "price_checked_at"
-          ],
-          "type": "object"
-        },
-        "maxItems": 10,
-        "type": "array"
-      },
-      "postal_code": {
-        "anyOf": [
-          {
-            "pattern": "^[0-9]{5}$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "product": {
-        "additionalProperties": false,
-        "properties": {
-          "bestprice_url": {
-            "format": "uri",
-            "type": "string"
-          },
-          "brand": {
-            "anyOf": [
-              {
-                "maxLength": 80,
-                "minLength": 1,
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "decision_id": {
-            "description": "Signed, anonymous id joining this recommendation to its BestPrice landing and outbound-click telemetry.",
-            "pattern": "^d1\\.[a-f0-9]{32}\\.[A-Za-z0-9_-]{43}$",
-            "type": "string"
-          },
-          "model": {
-            "maxLength": 220,
-            "minLength": 1,
-            "type": "string"
-          },
-          "product_id": {
-            "pattern": "^bp_[0-9]{10}$",
-            "type": "string"
-          },
-          "title": {
-            "maxLength": 220,
-            "minLength": 1,
-            "type": "string"
-          },
-          "variant": {
-            "anyOf": [
-              {
-                "maxLength": 180,
-                "minLength": 1,
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "product_id",
-          "title",
-          "brand",
-          "model",
-          "variant",
-          "decision_id",
-          "bestprice_url"
-        ],
-        "type": "object"
-      },
-      "quoted_lowest_item_price": {
-        "anyOf": [
-          {
-            "maximum": 10000000,
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Lowest item_price among the returned offers after public filters. Use this, not catalog_price_from, as a quoted item price."
-      },
-      "quoted_lowest_total_price": {
-        "anyOf": [
-          {
-            "maximum": 10000000,
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Lowest delivered total among returned offers with known shipping; null when none are known."
-      },
-      "schema_version": {
-        "const": "2.0",
-        "type": "string"
-      },
-      "warnings": {
-        "items": {
-          "maxLength": 240,
-          "minLength": 1,
-          "type": "string"
-        },
-        "maxItems": 20,
-        "type": "array"
-      }
-    },
-    "required": [
-      "schema_version",
-      "as_of",
-      "currency",
-      "locale",
-      "warnings",
-      "product",
-      "postal_code",
-      "objective",
-      "catalog_price_from",
-      "quoted_lowest_item_price",
-      "quoted_lowest_total_price",
-      "catalog_min_unquoted_reason",
-      "offers"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "as_of": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "currency": {
-        "const": "EUR",
-        "type": "string"
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "pattern": "^[A-Z][A-Z0-9_]{2,63}$",
-            "type": "string"
-          },
-          "message": {
-            "maxLength": 240,
-            "minLength": 1,
-            "type": "string"
-          },
-          "retryable": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "code",
-          "message",
-          "retryable"
-        ],
-        "type": "object"
-      },
-      "locale": {
-        "const": "el-GR",
-        "type": "string"
-      },
-      "schema_version": {
-        "const": "2.0",
-        "type": "string"
-      },
-      "warnings": {
-        "items": {
-          "maxLength": 240,
-          "minLength": 1,
-          "type": "string"
-        },
-        "maxItems": 20,
-        "type": "array"
-      }
-    },
-    "required": [
-      "schema_version",
-      "as_of",
-      "currency",
-      "locale",
-      "warnings",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "as_of": {
+        "format": "date-time",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+        "type": "string"
+      },
+      "catalog_min_unquoted_reason": {
+        "anyOf": [
+          {
+            "enum": [
+              "promoted",
+              "not_in_stock",
+              "missing_merchant",
+              "filtered",
+              "not_on_page",
+              "omitted_from_offer_list",
+              "no_catalog_price"
+            ],
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Why catalog_price_from is absent from the returned page. Null when the catalog min is quoted or the page is cheaper."
+      },
+      "catalog_price_from": {
+        "anyOf": [
+          {
+            "maximum": 10000000,
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Catalog lowest listed item price in EUR before shipping. Same identity as search_products.price_from. Not a buyable quote."
+      },
+      "currency": {
+        "const": "EUR",
+        "type": "string"
+      },
+      "locale": {
+        "const": "el-GR",
+        "type": "string"
+      },
+      "objective": {
+        "enum": [
+          "lowest_total_cost",
+          "lowest_item_price",
+          "merchant_rating"
+        ],
+        "type": "string"
+      },
+      "offers": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "availability": {
+              "enum": [
+                "in_stock",
+                "delivery_1_3_days",
+                "delivery_4_7_days",
+                "delivery_4_10_days",
+                "delivery_8_14_days",
+                "by_order",
+                "to_order",
+                "preorder",
+                "out_of_stock",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            "bundle_status": {
+              "enum": [
+                "single",
+                "bundle",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            "certification_level": {
+              "anyOf": [
+                {
+                  "enum": [
+                    "bronze",
+                    "silver",
+                    "gold",
+                    "platinum"
+                  ],
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "BestPrice certification tier of the store (php/classes/Merchant.php verification_level 1..4); null when not certified."
+            },
+            "condition": {
+              "enum": [
+                "new",
+                "refurbished",
+                "used",
+                "open_box",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            "delivery_estimate": {
+              "anyOf": [
+                {
+                  "maxLength": 80,
+                  "minLength": 1,
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "item_price": {
+              "description": "Current item price in EUR before shipping.",
+              "maximum": 10000000,
+              "minimum": 0,
+              "type": "number"
+            },
+            "merchant_id": {
+              "pattern": "^bp_merchant_[0-9]+$",
+              "type": "string"
+            },
+            "merchant_logo_url": {
+              "anyOf": [
+                {
+                  "format": "uri",
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "BestPrice CDN logo of the store; null when the store has none."
+            },
+            "merchant_name": {
+              "description": "Sanitized public BestPrice store name.",
+              "maxLength": 100,
+              "minLength": 1,
+              "type": "string"
+            },
+            "merchant_rating": {
+              "anyOf": [
+                {
+                  "maximum": 5,
+                  "minimum": 0,
+                  "type": "number"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "merchant_rating_count": {
+              "anyOf": [
+                {
+                  "maximum": 9007199254740991,
+                  "minimum": 0,
+                  "type": "integer"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "offer_id": {
+              "pattern": "^bp_offer_[0-9]+$",
+              "type": "string"
+            },
+            "offer_title": {
+              "maxLength": 220,
+              "minLength": 1,
+              "type": "string"
+            },
+            "price_checked_at": {
+              "format": "date-time",
+              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+              "type": "string"
+            },
+            "ranking_reason": {
+              "maxLength": 100,
+              "minLength": 1,
+              "type": "string"
+            },
+            "shipping_price": {
+              "anyOf": [
+                {
+                  "maximum": 10000000,
+                  "minimum": 0,
+                  "type": "number"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Known or estimated shipping price in EUR; null means unknown."
+            },
+            "shipping_status": {
+              "enum": [
+                "known",
+                "estimated",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            "total_price": {
+              "anyOf": [
+                {
+                  "maximum": 10000000,
+                  "minimum": 0,
+                  "type": "number"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Delivered total in EUR; null whenever shipping is unknown."
+            },
+            "variant": {
+              "anyOf": [
+                {
+                  "maxLength": 180,
+                  "minLength": 1,
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "verified_merchant": {
+              "description": "True when this is a BestPrice-certified store (Πιστοποιημένο κατάστημα).",
+              "type": "boolean"
+            }
+          },
+          "required": [
+            "offer_id",
+            "merchant_id",
+            "merchant_name",
+            "merchant_rating",
+            "merchant_rating_count",
+            "verified_merchant",
+            "offer_title",
+            "variant",
+            "item_price",
+            "shipping_price",
+            "shipping_status",
+            "total_price",
+            "availability",
+            "condition",
+            "bundle_status",
+            "delivery_estimate",
+            "ranking_reason",
+            "price_checked_at"
+          ],
+          "type": "object"
+        },
+        "maxItems": 10,
+        "type": "array"
+      },
+      "postal_code": {
+        "anyOf": [
+          {
+            "pattern": "^[0-9]{5}$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "product": {
+        "additionalProperties": false,
+        "properties": {
+          "bestprice_url": {
+            "format": "uri",
+            "type": "string"
+          },
+          "brand": {
+            "anyOf": [
+              {
+                "maxLength": 80,
+                "minLength": 1,
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "decision_id": {
+            "description": "Signed, anonymous id joining this recommendation to its BestPrice landing and outbound-click telemetry.",
+            "pattern": "^d1\\.[a-f0-9]{32}\\.[A-Za-z0-9_-]{43}$",
+            "type": "string"
+          },
+          "model": {
+            "maxLength": 220,
+            "minLength": 1,
+            "type": "string"
+          },
+          "product_id": {
+            "pattern": "^bp_[0-9]{10}$",
+            "type": "string"
+          },
+          "title": {
+            "maxLength": 220,
+            "minLength": 1,
+            "type": "string"
+          },
+          "variant": {
+            "anyOf": [
+              {
+                "maxLength": 180,
+                "minLength": 1,
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "required": [
+          "product_id",
+          "title",
+          "brand",
+          "model",
+          "variant",
+          "decision_id",
+          "bestprice_url"
+        ],
+        "type": "object"
+      },
+      "quoted_lowest_item_price": {
+        "anyOf": [
+          {
+            "maximum": 10000000,
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Lowest item_price among the returned offers after public filters. Use this, not catalog_price_from, as a quoted item price."
+      },
+      "quoted_lowest_total_price": {
+        "anyOf": [
+          {
+            "maximum": 10000000,
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Lowest delivered total among returned offers with known shipping; null when none are known."
+      },
+      "schema_version": {
+        "const": "2.0",
+        "type": "string"
+      },
+      "warnings": {
+        "items": {
+          "maxLength": 240,
+          "minLength": 1,
+          "type": "string"
+        },
+        "maxItems": 20,
+        "type": "array"
+      }
+    },
+    "required": [
+      "schema_version",
+      "as_of",
+      "currency",
+      "locale",
+      "warnings",
+      "product",
+      "postal_code",
+      "objective",
+      "catalog_price_from",
+      "quoted_lowest_item_price",
+      "quoted_lowest_total_price",
+      "catalog_min_unquoted_reason",
+      "offers"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "as_of": {
+        "format": "date-time",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+        "type": "string"
+      },
+      "currency": {
+        "const": "EUR",
+        "type": "string"
+      },
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "pattern": "^[A-Z][A-Z0-9_]{2,63}$",
+            "type": "string"
+          },
+          "message": {
+            "maxLength": 240,
+            "minLength": 1,
+            "type": "string"
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable"
+        ],
+        "type": "object"
+      },
+      "locale": {
+        "const": "el-GR",
+        "type": "string"
+      },
+      "schema_version": {
+        "const": "2.0",
+        "type": "string"
+      },
+      "warnings": {
+        "items": {
+          "maxLength": 240,
+          "minLength": 1,
+          "type": "string"
+        },
+        "maxItems": 20,
+        "type": "array"
+      }
+    },
+    "required": [
+      "schema_version",
+      "as_of",
+      "currency",
+      "locale",
+      "warnings",
+      "error"
+    ],
+    "type": "object"
+  }
+]

First observedv1.8.0Sep 3, 2026

TDQS

A4/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover readOnly/idempotent/non-destructive, yet the description still adds substantive traits: sponsored offers and merchant destination URLs are excluded, catalog minimum price is a separate field with an explanatory reason when absent, and totals become unknown without a postcode. It restates read-only once and mentions 'no CPC click', which is genuinely new. No rate limits or latency context, so not a 5.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The purpose leads, output fields follow, then ranking behavior and exclusions — a sound front-loaded order with no filler. It does duplicate schema content (postcode digits 10000–85999, the objective default) which costs some density, but no sentence is wholly wasted.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 6-parameter comparison tool with full schema coverage, an output schema, and rich annotations, the description covers scope, ranking behavior, exclusions, and the degraded-mode caveat about unknown shipping. An agent has what it needs to choose the tool and pick an objective correctly without further reading.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the schema already documents limit, objective, product_id, postal_code, in_stock_only and minimum_merchant_rating. The description largely echoes the objective default rule and the postcode range that the schema already states verbatim, adding little semantic value beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

A specific verb and resource: 'Compares current Greek merchant offers for one exact grouped BestPrice product ID', followed by an enumeration of the returned fields. It is clearly distinguishable from a price-history or search tool by the 'one exact grouped product ID' scoping, but it never names a sibling (e.g. search_products as the source of the id) so the boundary is implied rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives real selection logic among the ranking modes: default is lowest_total_cost when a postcode is supplied, lowest_item_price otherwise, and an explicit lowest_total_cost requires a Greek postcode. It also states that results exclude sponsored offers, which sets expectations. What is missing is an explicit 'call search_products first' instruction and any statement about when not to use this tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Deploy Server

Compare BestPrice offers

Instructions

Input Schema

Output Schema

Schema Changelog

TDQS

Other Tools