{"type":"firestarter.listing","listing":{"id":"lst_9iXlPO7c","product_name":"Fine Fountain Pen Nib","category":"Fountain pens","description":"A springy and smooth nib perfect for delicate thin strokes. Made exclusively for our fountain pens, all nibs are tipped with hard-wearing iridium for effortlessly smooth writing. You can choose between uncoated stainless steel (a sleek silver finish) or 14k gold plating (a classic gold finish) – the difference is purely aesthetic, so both options offer the same exceptional performance. Plus, every nib is interchangeable, allowing you to effortlessly switch styles whenever inspiration strikes.","images":["https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-fine-gold.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-fine-stainless-steel.jpg?v=1737634482"],"price":19,"currency":"USD","in_stock":true,"inventory_qty":39996,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:23.490Z"},"share_url":"https://firestarter.network/l/lst_9iXlPO7c","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_9iXlPO7c' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Fine Fountain Pen Nib' 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."]}}