{"type":"firestarter.listing","listing":{"id":"lst_bQGWilIY","product_name":"Leonardt EF Principal Calligraphy Nib","category":"Calligraphy","description":" The Leonardt EF Principal is a very flexible nib, great for expressive downstrokes.","images":["https://cdn.shopify.com/s/files/1/0089/6129/4417/products/calligraphy-nib-leonardt-ef-principal.jpg?v=1731937246"],"price":4,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:24.235Z"},"share_url":"https://firestarter.network/l/lst_bQGWilIY","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_bQGWilIY' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Leonardt EF Principal Calligraphy Nib' and a budget_max comfortably above $4.00 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."]}}