{"type":"firestarter.listing","listing":{"id":"lst_3Q2_LKC6","product_name":"Rollerball/Felt Tip Cartridge Grip Sections for \"Full Sized\" Pens","category":"Pen","description":"Our Rollerball/Felt Tip replacement grip sections allow you to convert your Schon DSGN \"Full Sized\" fountain or roller ball pen to accept two fun and unique refill cartridges from Schmidt!\nThe first is the Safety ceramic roller, a silky smooth writer with proprietary tech to keep it from drying out even when uncapped for extended periods.\nThe second is the FineLiner, a spring-backed felt tip cartridge with a super unique feel that offers a fine lined, marker like writing experience.\nBoth refills are included with the grip section, which is available in both natural and black ultem. \nThese grip sections can only be used with our engineered plastics and anodized aluminum \"Full Sized\" fountain pens, and are not compatible with any of our pocket fountain pens or classic and V2 ballpoint pens. ","images":["https://cdn.shopify.com/s/files/1/0281/7862/products/Natural_Ultem_Marker_Tip.jpg?v=1769625819","https://cdn.shopify.com/s/files/1/0281/7862/products/Black_Ultem_Marker_Tip.jpg?v=1769625819","https://cdn.shopify.com/s/files/1/0281/7862/products/inks.jpg?v=1769625819"],"price":40,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:17.177Z"},"share_url":"https://firestarter.network/l/lst_3Q2_LKC6","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_3Q2_LKC6' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Rollerball/Felt Tip Cartridge Grip Sections for \"Full Sized\" Pens' and a budget_max comfortably above $40.00 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."]}}