{
  "agent_meta": {
    "type": "agent_product",
    "schema": "mcc_agent",
    "schema_version": "1.1",
    "generated_at": "2026-11-07",
    "source_of_truth": "MCC Commerce Engine"
  },

  "request_context": {
    "language": {
      "id_lang": 2,
      "iso_code": "en",
      "url_prefix": "\/en\/"
    },
    "delivery_country": {
      "id_country": 0,
      "iso_code": false
    },
    "currency": {
      "id_currency": 1,
      "iso_code": "EUR",
      "name": "Euro",
      "symbol": "\u20ac"
    },
    "complete": true
  },

  "context_switching": {
    "available": true,
    "mode": "on_demand_resolver",
    "stateless": true,
    "resolver": "links.agent.contexts",
    "fetch_when": "requested_context_differs",
    "dimensions": [
      "language",
      "delivery_country",
      "currency"
    ],
    "unspecified_dimensions": "preserve_request_context",
    "selection": {
      "match": "exact",
      "source": "available_contexts",
      "result": "available_contexts[].target_url"
    },
    "target": {
      "resource": "product",
      "id_product": 117
    },
    "full_context_in_target_url": true,
    "requires_session_persistence": false,
    "manual_url_construction_allowed": false,
    "instruction": "When a requested language, delivery country or currency differs from request_context, fetch links.agent.contexts. Preserve dimensions not explicitly changed by the user, select the exact matching entry and follow target_url unchanged."
  },

  "platform": {
    "name": "MCC Agentic Commerce",
    "version": "1.0",
    "commerce_engine": "MCC Commerce Engine",
    "agent_interface": "MCC Agentic API"
  },

  "instructions": {
    "purpose": "This endpoint provides the complete machine-readable representation of one product in the active language, delivery-country and currency context.",
    "rules": [
      "All prices, taxes, availability and actions in data.product apply only to request_context.",
      "When variants exist, select the matching entry from data.product.variant_offers and use its exact price, availability and action URL.",
      "Do not infer a variant price from the product-level price or from another variant.",
      "Use the exact action.url supplied by the selected offer. Do not construct add-to-cart URLs manually.",
      "When language, delivery country or currency must change, fetch links.agent.contexts and follow the exact matching target_url unchanged.",
      "Prices, taxes, inventory and availability are calculated by the shop.",
      "Do not invent unavailable product, variant, price, stock, shipping or checkout information."
    ]
  },

  "capabilities": {
    "root": true,
    "sitemap": true,
    "search": true,
    "product": true,
    "contexts": true,
    "category": true,
    "cart": true,
    "cms_page": false,
    "checkout": false
  },

  "links": {
    "self": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/product?id_product=117&setCountry=0&setCurrency=1",
    "agent": {
      "root": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/root?setCountry=0&setCurrency=1",
      "sitemap": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/sitemap?setCountry=0&setCurrency=1",
      "search": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/search?setCountry=0&setCurrency=1",
      "cart": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/cart?setCountry=0&setCurrency=1",
      "product": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/product?id_product=117&setCountry=0&setCurrency=1",
      "contexts": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/contexts?resource=product&id_product=117&setCountry=0&setCurrency=1"
    },
    "human": {
      "home": "https:\/\/musiccraft-instruments.com\/",
      "sitemap": "https:\/\/musiccraft-instruments.com\/en\/sitemap",
      "search": "https:\/\/musiccraft-instruments.com\/en\/search",
      "product": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html",
      "cart": "https:\/\/musiccraft-instruments.com\/en\/order",
      "contact": "https:\/\/musiccraft-instruments.com\/en\/contact-us"
    }
  },

  "commerce_model": {
    "pricing": "server_calculated",
    "tax": "server_calculated",
    "shipping": "server_calculated",
    "inventory": "live",
    "currencies": "context_based",
    "languages": "url_based"
  },

  "data": {
    "product": {
      "@context": "https://schema.org",
      "@type": "Product",
      "@id": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html#product",
      "url": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html",
      "urls": {
        "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/product?id_product=117&setCountry=0&setCurrency=1",
        "contexts": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/contexts?resource=product&id_product=117&setCountry=0&setCurrency=1",
        "human": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html"
      },

      "id_product": 117,
      "name": "Wittner Ultra Tailpiece for Cello \u2013 Stability Without the Weight",
      "description": "The Wittner Ultra tailpiece for cello combines lightweight modern construction with integrated fine tuners for balanced response and reliable control.",
      "full_description": "Cello playing is not just about power. It is about control.  The Wittner Ultra tailpiece for cello is designed to reduce weight while improving stability and tuning comfort. Its advanced Hi-Tec composite construction creates a balanced combination of resonance, durability and everyday reliability.  The integrated fine tuners make tuning more direct and comfortable without adding extra hardware to the instrument. Especially on cello, a lightweight and carefully balanced tailpiece can noticeably influence response, control and overall playing feel.  Available for multiple cello sizes, the Wittner Ultra is suitable for both student and professional concert instruments.   Less weight on the instrument. More focus on the sound.",
      "additional_text": "Wittner Ultra tailpiece for cello \n Available for multiple cello sizes \n Integrated fine tuners \n Lightweight Hi-Tec composite construction \n Supports open resonance and controlled response \n Color: black \n Ideal for practice, stage and studio use",

      "sku": "819\/530",
      "mpn": "819\/530",
      "ean13": "",
      "upc": "",

      "brand": {
        "@type": "Brand",
        "name": "Wittner \u2013 Division of GEWA music GmbH",
        "url": "https:\/\/musiccraft-instruments.com\/en\/wittner-division-of-gewa-music-gmbh_19"      },

      "manufacturer": {
        "@type": "Organization",
        "id_manufacturer": 19,
        "name": "Wittner \u2013 Division of GEWA music GmbH",
        "url": "https:\/\/musiccraft-instruments.com\/en\/wittner-division-of-gewa-music-gmbh_19"      },

      "supplier": {
        "@type": "Organization",
        "id_supplier": 1,
        "name": "Migma e.G."
      },

      "main_category": {
        "id_category": 77,
        "name": "Tailpiece",
        "link_rewrite": "tailpiece",
        "urls": {
          "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/category?id_category=77&setCountry=0&setCurrency=1",
          "human": "https:\/\/musiccraft-instruments.com\/en\/tailpiece-77"
        }
      },

      "categories": [
                            {
            "id_category": 4,
            "name": "Instruments",
            "link_rewrite": "instruments",
            "urls": {
              "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/category?id_category=4&setCountry=0&setCurrency=1",
              "human": "https:\/\/musiccraft-instruments.com\/en\/instruments-4"
            }
          },                    {
            "id_category": 6,
            "name": "Equipment & Essentials",
            "link_rewrite": "equipment-essentials",
            "urls": {
              "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/category?id_category=6&setCountry=0&setCurrency=1",
              "human": "https:\/\/musiccraft-instruments.com\/en\/equipment-essentials-6"
            }
          },                    {
            "id_category": 7,
            "name": "Restoration",
            "link_rewrite": "restoration",
            "urls": {
              "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/category?id_category=7&setCountry=0&setCurrency=1",
              "human": "https:\/\/musiccraft-instruments.com\/en\/restoration-7"
            }
          },                    {
            "id_category": 5,
            "name": "Highlight",
            "link_rewrite": "highlight",
            "urls": {
              "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/category?id_category=5&setCountry=0&setCurrency=1",
              "human": "https:\/\/musiccraft-instruments.com\/en\/highlight-5"
            }
          }                        ],

      "features": [
                            {
            "id_feature": 1,
            "id_feature_value": 150,
            "name": "Product declaration",
            "value": "Spare parts"
          },                    {
            "id_feature": 1,
            "id_feature_value": 1,
            "name": "Product declaration",
            "value": "Utensils"
          },                    {
            "id_feature": 15,
            "id_feature_value": 130,
            "name": "Taxation",
            "value": "Standard Rate"
          },                    {
            "id_feature": 9,
            "id_feature_value": 325,
            "name": "Instrument",
            "value": "Cello"
          },                    {
            "id_feature": 28,
            "id_feature_value": 328,
            "name": "Components",
            "value": "String holder"
          },                    {
            "id_feature": 29,
            "id_feature_value": 353,
            "name": "Size for",
            "value": "4\/4 + 7\/8 Size"
          },                    {
            "id_feature": 29,
            "id_feature_value": 355,
            "name": "Size for",
            "value": "1\/4 + 1\/8 Size"
          },                    {
            "id_feature": 29,
            "id_feature_value": 354,
            "name": "Size for",
            "value": "1\/2 + 3\/4 Size"
          },                    {
            "id_feature": 2,
            "id_feature_value": 502,
            "name": "Badges",
            "value": "Different variants"
          },                    {
            "id_feature": 2,
            "id_feature_value": 350,
            "name": "Badges",
            "value": "High-tech composite material"
          }                        ],

      "agent_faqs": [
              ],

      "images": [
                            {
            "id_image": 2326,
            "cover": true,
            "position": 1,
            "legend": "Wittner Ultra Tailpiece for Cello \u2013 Stability Without the Weight",
            "url": "https:\/\/cdn1.musiccraft-instruments.com\/2326-large_default\/wittner-ultra-tailpiece-cello.webp"
          }                        ],

            "shipping_weight": {
        "@type": "QuantitativeValue",
        "value": 0.2,
        "unitCode": "KGM",
        "note": "Shipping weight, not product content."
      },
      
      
      "variant_model": {
        "has_variants": true,
        "variant_count": 3,
        "default_id_product_attribute": 381
      },

      "offers": {
        "@type": "Offer",
        "offer_scope": "default_variant",
        "id_product": 117,
        "id_product_attribute": 381,
        "url": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html",
        "price": 34.90,
        "priceCurrency": "EUR",
        "availability": "https://schema.org/InStock",
        "itemCondition": "https://schema.org/NewCondition",
        "seller": {
          "@type": "Organization",
          "name": "musiccraft - instruments",
          "url": "https:\/\/musiccraft-instruments.com\/",
          "telephone": "+49 (0) 34 20 63 14 888"        },
        "priceSpecification": {
          "@type": "PriceSpecification",
          "price": 34.90,
          "priceCurrency": "EUR",
          "valueAddedTaxIncluded": true        }
              },

      "variant_offers": [
                            {
            "@type": "Offer",
            "id_product": 117,
            "id_product_attribute": 382,
            "is_default": false,
            "sku": "819\/531",
            "url": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html",
            "image": "https:\/\/cdn2.musiccraft-instruments.com\/1-large_default\/wittner-ultra-tailpiece-cello.webp",

                                                                                                                                                                                                                                                "attributes": [
                                              {
                  "group_id": 10,
                  "group_name": "Size",
                  "value": "1\/2 + 3\/4 Size"
                }                                          ],
            "attribute_summary": "Size: 1\/2 + 3\/4 Size",

            "price": {
              "delivery_country": false,
              "currency": "EUR",
              "currency_symbol": "\u20ac",
              "tax_rate": 19,
              "tax_excluded": 29.33,
              "tax_included": 34.90,
              "without_reduction_tax_excluded": 29.33,
              "without_reduction_tax_included": 34.90,
              "value_added_tax_included": true            },

            
            "availability": "https://schema.org/InStock",
            "quantity": 5,
            "minimal_quantity": 1,
            "action": {
              "type": "add_to_cart",
              "method": "GET",
              "enabled": true,
              "quantity": 1,
              "url": "https:\/\/musiccraft-instruments.com\/en\/shopping-cart?add=1&id_product=117&id_product_attribute=382&qty=1&setCountry=0&setCurrency=1"
            }
          },                    {
            "@type": "Offer",
            "id_product": 117,
            "id_product_attribute": 383,
            "is_default": false,
            "sku": "819\/532",
            "url": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html",
            "image": "https:\/\/cdn2.musiccraft-instruments.com\/1-large_default\/wittner-ultra-tailpiece-cello.webp",

                                                                                                                                                                                                                                                "attributes": [
                                              {
                  "group_id": 10,
                  "group_name": "Size",
                  "value": "1\/4 + 1\/8 Size"
                }                                          ],
            "attribute_summary": "Size: 1\/4 + 1\/8 Size",

            "price": {
              "delivery_country": false,
              "currency": "EUR",
              "currency_symbol": "\u20ac",
              "tax_rate": 19,
              "tax_excluded": 29.33,
              "tax_included": 34.90,
              "without_reduction_tax_excluded": 29.33,
              "without_reduction_tax_included": 34.90,
              "value_added_tax_included": true            },

            
            "availability": "https://schema.org/InStock",
            "quantity": 5,
            "minimal_quantity": 1,
            "action": {
              "type": "add_to_cart",
              "method": "GET",
              "enabled": true,
              "quantity": 1,
              "url": "https:\/\/musiccraft-instruments.com\/en\/shopping-cart?add=1&id_product=117&id_product_attribute=383&qty=1&setCountry=0&setCurrency=1"
            }
          },                    {
            "@type": "Offer",
            "id_product": 117,
            "id_product_attribute": 381,
            "is_default": true,
            "sku": "819\/530",
            "url": "https:\/\/musiccraft-instruments.com\/en\/p\/wittner-ultra-tailpiece-cello-117.html",
            "image": "https:\/\/cdn2.musiccraft-instruments.com\/1-large_default\/wittner-ultra-tailpiece-cello.webp",

                                                                                                                                                                                                                                                "attributes": [
                                              {
                  "group_id": 10,
                  "group_name": "Size",
                  "value": "4\/4 + 7\/8 Size"
                }                                          ],
            "attribute_summary": "Size: 4\/4 + 7\/8 Size",

            "price": {
              "delivery_country": false,
              "currency": "EUR",
              "currency_symbol": "\u20ac",
              "tax_rate": 19,
              "tax_excluded": 29.33,
              "tax_included": 34.90,
              "without_reduction_tax_excluded": 29.33,
              "without_reduction_tax_included": 34.90,
              "value_added_tax_included": true            },

            
            "availability": "https://schema.org/InStock",
            "quantity": 5,
            "minimal_quantity": 1,
            "action": {
              "type": "add_to_cart",
              "method": "GET",
              "enabled": true,
              "quantity": 1,
              "url": "https:\/\/musiccraft-instruments.com\/en\/shopping-cart?add=1&id_product=117&id_product_attribute=381&qty=1&setCountry=0&setCurrency=1"
            }
          }                        ],

      "pricing": {
        "scope": "default_variant",
        "default_id_product_attribute": 381,
        "delivery_country": false,
        "currency": "EUR",
        "currency_symbol": "\u20ac",
        "tax_rate": 19,
        "use_taxes": true,
        "show_taxes": true,
        "price_tax_included": 34.90,
        "price_tax_excluded": 29.33,
        "price_without_reduction": 29.33,
        "reduction_percent": 0,
        "reduction_price": 0      },

      "availability": {
        "status": "https://schema.org/InStock",
        "orderable": true,
        "available_for_order": true,
        "show_price": true,
        "quantity": 15,
        "minimal_quantity": 1,
        "variant_stock_available": true,
        "allow_buy_when_out_of_stock": false,
        "stock_management": false,
        "is_virtual": false      }
    },

    "actions": {
      "add_to_cart": {
        "type": "cart_add",
        "method": "GET",
        "requires_context": true,
        "required_context_parameters": [
          "setCountry",
          "setCurrency"
        ],
        "instruction": "Use the exact action.url from data.product.offers for a simple product or from the selected data.product.variant_offers entry. Respect action.enabled and action.quantity."
      }
    }
  }
}