{"type":"firestarter.listing","listing":{"id":"lst_oju_mG5C","product_name":"Nahvalur Nautilus Fountain Pen - Chelonia Green","category":"Fountain Pen","description":" \nThe new Nautilus collection from Narwhal are oversized, piston filling pens created from European Ebonite.  The collection features four intricate ink windows carved on the barrel of the pen which resemble the port holes of a ship.\n *Chelonia Green is top pen in product image\nFilling System: Internal Piston\nNib: Steel","images":["https://cdn.shopify.com/s/files/1/0575/7177/files/photo-output_1_ef509167-d11d-4b7a-acd8-7322c20615a9.jpg?v=1757075880","https://cdn.shopify.com/s/files/1/0575/7177/files/photo-output_0_f2685b29-fffe-4954-8c5d-14866559deb6.jpg?v=1757075881","https://cdn.shopify.com/s/files/1/0575/7177/files/green.jpg?v=1757076558","https://cdn.shopify.com/s/files/1/0575/7177/files/green01.jpg?v=1757076558","https://cdn.shopify.com/s/files/1/0575/7177/files/nautilusgroup.jpg?v=1757076558"],"price":180,"currency":"USD","in_stock":true,"inventory_qty":29997,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:01.710Z"},"share_url":"https://firestarter.network/l/lst_oju_mG5C","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_oju_mG5C' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Nahvalur Nautilus Fountain Pen - Chelonia Green' and a budget_max comfortably above $180.00 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."]}}