{"type":"firestarter.listing","listing":{"id":"lst_5OrwEbDe","product_name":"Kaplan Non-Whistling Violin E String, 4/4 Scale","category":"D'Addario","description":"The ever-popular Kaplan Non-Whistling E String is an essential string for violinists of all styles.  This aluminum wrapped stranded steel core string provides a solution for those seeking to eliminate excessive E-string noise.  A Kaplan Ball-End Adaptor is included to accommodate loop-end hook-type fine tuners.","images":["https://cdn.shopify.com/s/files/1/0669/6042/5025/files/do_KS311W-44M_main_transparent_e250eec8-d695-42c4-b675-afe46e1170b5.png?v=1773014489","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/do_kaplan_E_string_EnhancedImage1_transparent_web_63330d5d-cdef-407c-829a-f41bd5ca6441.png?v=1773014489","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/do_kaplan_E_string_EnhancedImage2_transparent_web_22639819-a879-4c55-9386-5b228ca8c11f.png?v=1773014489","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/do_kaplan_E_string_EnhancedImage3_transparent_web_3901f210-0179-400e-b82c-40de8135465c.png?v=1773014490","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/do_kaplan_E_string_EnhancedImage4_transparent_web_fe3518d2-4659-488d-b560-6a1531447f85.png?v=1773014491"],"price":14.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:55:57.525Z"},"share_url":"https://firestarter.network/l/lst_5OrwEbDe","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_5OrwEbDe' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Kaplan Non-Whistling Violin E String, 4/4 Scale' and a budget_max comfortably above $14.99 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}