{"type":"firestarter.listing","listing":{"id":"lst_7BOthiAK","product_name":"Spare Ink Cartridges for Fountain Pen and Inkballs","category":null,"description":"These are Short International Standard Cartridges that fit both the Pocket 6 Fountain Pen and the Inkball Pens.  \nBlack, blue and empty cartridges are available, but a whole world of fantastic colors are available from retailers other than Schon DSGN! ","images":["https://cdn.shopify.com/s/files/1/0281/7862/products/IMG_1903.jpg?v=1605717136","https://cdn.shopify.com/s/files/1/0281/7862/files/6cartridgesblank.jpg?v=1726150906"],"price":3.5,"currency":"USD","in_stock":true,"inventory_qty":29997,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:17.271Z"},"share_url":"https://firestarter.network/l/lst_7BOthiAK","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_7BOthiAK' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Spare Ink Cartridges for Fountain Pen and Inkballs' and a budget_max comfortably above $3.50 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."]}}