{"type":"firestarter.listing","listing":{"id":"lst_5dghvafI","product_name":"XT Dynacore HD Extended Range Singles","category":"D'Addario","description":"Built for 7 and 8-string classical guitars, XT High Density strings pair D'Addario's advanced Dynacore multifilament cores and high-density alloys to deliver optimized tension, note clarity, and dynamic projection for extended-range classical guitar players. This new string design offers a powerful yet balanced low-end that stays articulate and responsive, at the right tension, while our XT coating provides extended string life and a natural feel. \n","images":["https://cdn.shopify.com/s/files/1/0669/6042/5025/files/ds_XTCHD8_main_transparent_web_0684b56a-8486-4d70-b8c4-a243ee961c13.png?v=1783349967","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/ds_XTCHD8_main_transparent_web.png?v=1783349964","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/ds_XTCHD7_main_transparent_web.png?v=1783349959","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/XTCHD7_detail1_hi-res.jpg?v=1783349952","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/ds_XTCHD7_detail1_transparent_web.png?v=1783349956","https://cdn.shopify.com/s/files/1/0669/6042/5025/files/ds_XTCHD8_detail1_transparent_web.png?v=1783349961"],"price":24.99,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-07-06T16:59:17.124Z"},"share_url":"https://firestarter.network/l/lst_5dghvafI","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 ","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_5dghvafI' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy XT Dynacore HD Extended Range Singles' and a budget_max comfortably above $24.99 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."]}}