{"type":"firestarter.listing","listing":{"id":"lst_G1j1DvfB","product_name":"Spare Cartridges for the Machined Pen V2 Ballpoint","category":null,"description":"Spare/Replacement Refills for the Machined Pen V2  Ballpoint (Parker Style Cartridges) pen in a variety of line-weights and colors.\nHow do I know if I have the Classic or Machined Pen V2 ?! Does your pen have a brass setscrew in the back of the body, if so, its a classic! If not, V2! ","images":["https://cdn.shopify.com/s/files/1/0281/7862/files/IMG_0001.jpg?v=1692115816"],"price":6,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:17.223Z"},"share_url":"https://firestarter.network/l/lst_G1j1DvfB","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_G1j1DvfB' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Spare Cartridges for the Machined Pen V2 Ballpoint' and a budget_max comfortably above $6.00 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."]}}