{ "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": 38 }, "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=38&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=38&setCountry=0&setCurrency=1", "contexts": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/contexts?resource=product&id_product=38&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\/double-bass-101-stefan-kreul-38.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\/double-bass-101-stefan-kreul-38.html#product", "url": "https:\/\/musiccraft-instruments.com\/en\/p\/double-bass-101-stefan-kreul-38.html", "urls": { "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/product?id_product=38&setCountry=0&setCurrency=1", "contexts": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/contexts?resource=product&id_product=38&setCountry=0&setCurrency=1", "human": "https:\/\/musiccraft-instruments.com\/en\/p\/double-bass-101-stefan-kreul-38.html" }, "id_product": 38, "name": "Double Bass 101 \u2013 Not just an instrument. A voice.", "description": "Handcrafted master double bass by Stefan Kreul. Built from carefully aged tonewood for musicians who don\u2019t just want to play \u2014 but truly sound.", "full_description": "Some instruments accompany you. Others completely change the way you feel music. The Double Bass 101 by Stefan Kreul clearly belongs to the second category. One look is enough to understand: this is not industrial mass production. No rushed high-gloss product. This bass was built the way true craftsmanship should be built \u2014 slowly, precisely and with enormous respect for sound. In Stefan Kreul\u2019s master workshop in Markneukirchen, instruments for demanding musicians have been handcrafted for generations. The family tradition reaches back to 1889. And this heritage isn\u2019t just part of the story \u2014 you can actually hear it in every note.\u00a0 The Model 101 in gamba shape delivers a large, open and deeply resonant tone with remarkable warmth and projection. The poplar back creates depth and richness, while the carefully selected spruce top provides response and dynamics. Together, they create a sound that doesn\u2019t simply become loud \u2014 it becomes present. A sound that stays in the room. The instrument is handcrafted from exceptionally well-seasoned tonewood. Spirit varnish, ebony fingerboard, Rubner tuning machines and Belcanto strings immediately show that no compromises were made in the details. And you can feel that while playing. The bass responds directly, remains controllable and develops that rare balance between power and musical openness. Perfect for jazz, classical music, chamber ensembles, studio sessions or simply musicians searching for an instrument that inspires instead of limiting them. Stefan Kreul\u2019s instruments are not designed through factory logic. Models, archings and construction styles are intentionally developed to create unique tonal personalities and playing experiences. That\u2019s exactly why these instruments feel so alive and individual. You don\u2019t simply buy an instrument like this. You grow old with it. Handcrafted in Markneukirchen. For people who don\u2019t need music to sound perfect. Just real.", "additional_text": "Master-crafted double bass in gamba shape \n Handmade by master violin maker Stefan Kreul \n Poplar back and premium spruce top \n Built from exceptionally aged tonewood \n Ebony fingerboard \n Rubner tuning machines \n Belcanto strings \n Hand-applied spirit varnish \n Available in dark or light brown shading \n Traditional craftsmanship from Markneukirchen \n Made in Germany", "sku": "213\/101", "mpn": "213\/101", "ean13": "", "upc": "", "brand": { "@type": "Brand", "name": "Stefan Kreul \u2013 Master Luthier for Cellos & Double Basses", "url": "https:\/\/musiccraft-instruments.com\/en\/stefan-kreul-master-luthier-for-cellos-double-basses_12" }, "manufacturer": { "@type": "Organization", "id_manufacturer": 12, "name": "Stefan Kreul \u2013 Master Luthier for Cellos & Double Basses", "url": "https:\/\/musiccraft-instruments.com\/en\/stefan-kreul-master-luthier-for-cellos-double-basses_12" }, "supplier": { "@type": "Organization", "id_supplier": 1, "name": "Migma e.G." }, "main_category": { "id_category": 24, "name": "Double Basses", "link_rewrite": "double-basses", "urls": { "agent": "https:\/\/musiccraft-instruments.com\/en\/mcc\/mcc_agent\/category?id_category=24&setCountry=0&setCurrency=1", "human": "https:\/\/musiccraft-instruments.com\/en\/double-basses-24" } }, "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": 3, "name": "Product declaration", "value": "Single item" }, { "id_feature": 15, "id_feature_value": 130, "name": "Taxation", "value": "Standard Rate" }, { "id_feature": 9, "id_feature_value": 323, "name": "Instrument", "value": "Double bass" } ], "agent_faqs": [ ], "images": [ { "id_image": 2112, "cover": true, "position": 1, "legend": "101 Double Bass by Stefan Kreul", "url": "https:\/\/cdn1.musiccraft-instruments.com\/2112-large_default\/double-bass-101-stefan-kreul.webp" }, { "id_image": 2113, "cover": false, "position": 2, "legend": "101 Double Bass by Stefan Kreul", "url": "https:\/\/cdn1.musiccraft-instruments.com\/2113-large_default\/double-bass-101-stefan-kreul.webp" } ], "shipping_weight": { "@type": "QuantitativeValue", "value": 12, "unitCode": "KGM", "note": "Shipping weight, not product content." }, "variant_model": { "has_variants": false, "variant_count": 0, "default_id_product_attribute": 0 }, "offers": { "@type": "Offer", "offer_scope": "product", "id_product": 38, "id_product_attribute": 0, "url": "https:\/\/musiccraft-instruments.com\/en\/p\/double-bass-101-stefan-kreul-38.html", "price": 17900.00, "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": 17900.00, "priceCurrency": "EUR", "valueAddedTaxIncluded": true } , "action": { "type": "add_to_cart", "method": "GET", "enabled": true, "quantity": 1, "url": "https:\/\/musiccraft-instruments.com\/en\/shopping-cart?add=1&id_product=38&qty=1&setCountry=0&setCurrency=1" } }, "variant_offers": [ ], "pricing": { "scope": "product", "default_id_product_attribute": 0, "delivery_country": false, "currency": "EUR", "currency_symbol": "\u20ac", "tax_rate": 19, "use_taxes": true, "show_taxes": true, "price_tax_included": 17900.00, "price_tax_excluded": 15042.02, "price_without_reduction": 15042.02, "reduction_percent": 0, "reduction_price": 0 }, "availability": { "status": "https://schema.org/InStock", "orderable": true, "available_for_order": true, "show_price": true, "quantity": 10, "minimal_quantity": 1, "variant_stock_available": false, "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." } } } }