{"type":"firestarter.listing","listing":{"id":"lst_WI_sbC_R","product_name":"Leonardo Momento Zero Fountain Pen - Artica ST","category":"Fountain Pen","description":"Momento zero Artica, the glacial charm of vast, unspoiled landscapes dominated by majestic glaciers, icebergs, fjords and steep rocky snow-capped peaks plunging into the ocean. Cool shades of blue blend harmoniously with white in the new MZ Artica, giving a sense of peace and calm.- - - Filling system converter/cartrigesThe nib:Steel nibs 'la fenice' EF, F, M, B, Stub1.1, Stub1.5Elastic steel nib Extra fine o FineGold nib 'la Fenice' EEF, EF, F, M, B, Stub1.1 Elastic Gold nib Elastic EF and Elastic FClosed pen lenght: 142mmCap lenght: 65mmBarrel lenght: 127mm (nib included)Weight inkless: 27gCap diameter: 15,5mmGrip diameter: 10,6mm ","images":["https://cdn.shopify.com/s/files/1/0575/7177/files/photo-output_9_5299c744-9028-4e87-b5b2-8fd1e801e907.jpg?v=1777557777","https://cdn.shopify.com/s/files/1/0575/7177/files/Momento-zero-Artica-2.jpg?v=1775662455","https://cdn.shopify.com/s/files/1/0575/7177/files/Momento-zero-Artica-3.jpg?v=1775662457"],"price":179,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:45:59.008Z"},"share_url":"https://firestarter.network/l/lst_WI_sbC_R","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_WI_sbC_R' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Leonardo Momento Zero Fountain Pen - Artica ST' and a budget_max comfortably above $179.00 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."]}}