{"type":"firestarter.listing","listing":{"id":"lst_4zdt20E4","product_name":"The A24 Kolbenfüller (Juma)","category":"Fountain Pen","description":"The Kolbenfüller is our first Piston filler pen. We chose one of our favorite commercial materials (JUMA) to highlight this beauty. It features a generous 1.75\" cast acrylic ink window (will not yellow), combined with one of the 9 colors of Juma.\nJuma is a thermo plastic with a snake skin / reptile scale pattern\nYou can optionally have the metal piston body sleeved with the same color juma material for consistency of appearance.\nIn the image gallery, please see the photo with all juma colors available.","images":["https://cdn.shopify.com/s/files/1/0329/5117/3260/files/HPC-Day2-0466.jpg?v=1723118523","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/HPC-Day2-0472.jpg?v=1723118691","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/HPC-Day2-0484.jpg?v=1723118752","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/HPC-Day2-0490.jpg?v=1723118803","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/HPC-Day2-0496.jpg?v=1723118857","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/PXL_20241101_010114257.jpg?v=1730431513","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/Hinze-Custom-Order-Form-1_Page_1_6723b42c-8f54-49e6-ae4b-a2dbc2273025.jpg?v=1771952136","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/Hinze-Custom-Order-Form-1_Page_2_10b8831f-3900-4907-a9c1-c8e010d342f3.jpg?v=1771952136","https://cdn.shopify.com/s/files/1/0329/5117/3260/files/jumaexotic-carbongrouppic_600x_7952d1ec-56ff-4d5c-9d92-0488cc14974d.webp?v=1738405699"],"price":259.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:21.940Z"},"share_url":"https://firestarter.network/l/lst_4zdt20E4","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_4zdt20E4' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy The A24 Kolbenfüller (Juma)' and a budget_max comfortably above $259.99 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."]}}