{"type":"firestarter.listing","listing":{"id":"lst_iR6EaX1y","product_name":"Fountain Pen Ink - 14 Marianas","category":"Ink","description":"The finest British-made fountain pen ink suitable for all pens. Named for the deepest point of the ocean (the Mariana Trench) this deep blue ink reflects the ocean’s mystical depths.\n\nTransform the way you create with an ink colour that sets you apart!\n\nMost pens offer ink cartridges in a limited selection of colours. I want to change that by bringing you this range of beautifully rich and distinctive inks – with no need to dispose of or replace an empty cartridge.\nThese wonderfully free-flowing inks come in a number of beautiful and nuanced shades. They truly are a joy to write or create with!","images":["https://cdn.shopify.com/s/files/1/0089/6129/4417/products/fountain-pen-ink-marianas-packaging-bottle-swatch.jpg?v=1772120449"],"price":19,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:23.944Z"},"share_url":"https://firestarter.network/l/lst_iR6EaX1y","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_iR6EaX1y' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Fountain Pen Ink - 14 Marianas' and a budget_max comfortably above $19.00 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."]}}