{"type":"firestarter.listing","listing":{"id":"lst_6QzkWHY_","product_name":"Model 20 Dark Room Emulsion w/ Black Rollerball","category":"Rollerball","description":"\n\n\n\n♦ The 20 Marietta rollerballs are capped with clips, with the pressure fit capping and posting system. \n♦ Dimensions:  5.0\" from nib tip to barrel end = 127mm5.45\" capped length = 138.43mm\n6.125\" cap posted length from nib tip to cap top = 156mm2.175\" cap = 55.25mm.575\" cap diameter = 14.61mm.51\" barrel diameter = 12.95mm.41\" smallest diameter of grip section = 10.41mm \n♦ Lifetime warranty / 30 day money back guarantee♦ All 20 Marietta rollerballs come with a Franklin-Christoph 888 refill found here.♦ $150.00 each♦ Shipped in a single pen zippered pouch. \n\n\n\n","images":["https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20RBDREBlackopen.jpg?v=1726062696","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20RBDREBlackposted.jpg?v=1726062702","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20RBDREBlack.jpg?v=1726062705"],"price":150,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:20.350Z"},"share_url":"https://firestarter.network/l/lst_6QzkWHY_","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 ","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_6QzkWHY_' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Model 20 Dark Room Emulsion w/ Black Rollerball' and a budget_max comfortably above $150.00 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."]}}