{"type":"firestarter.listing","listing":{"id":"lst_cD-2eRPx","product_name":"Universal Nib Holder","category":"Calligraphy","description":"This unique universal nib holder makes changing and securing calligraphy nibs an absolute breeze. Designed to be compatible with all Tom’s Studio oblique calligraphy pens, it allows you to simply tighten or loosen the screw and pop your nib of choice in until you have a perfectly snug fit.\nPlease note: This listing is for the metal universal nib holder component only and does not include the pen body or nib.","images":["https://cdn.shopify.com/s/files/1/0089/6129/4417/files/universal-nib-holder.png?v=1746022193"],"price":13,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:23.079Z"},"share_url":"https://firestarter.network/l/lst_cD-2eRPx","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_cD-2eRPx' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Universal Nib Holder' and a budget_max comfortably above $13.00 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."]}}