{"type":"firestarter.listing","listing":{"id":"lst_apIiZ4zR","product_name":"Square - Hardback Book by Mac Barnett & Jon Klassen","category":"Curated","description":"The beguiling second entry in the innovative shape trilogy by multi-award-winning, New York Times best-selling duo Mac Barnett and Jon Klassen.This book is about Square. Square spends every day taking blocks from a pile below the ground to a pile above the ground. This book is also about Square’s friend Circle. Circle thinks Square is an artistic genius. But is he really? With the second story in a trilogy of tales about Triangle, Square, and Circle, Mac Barnett and Jon Klassen nudge readers toward a more well-rounded way of looking at things. Understated and striking in its simplicity, this funny, thoughtful offering from two of today’s most talented picture-book creators emphasizes the importance of keeping your eyes — and your mind — open to wonder where others see only rubble and rocks.","images":["https://cdn.shopify.com/s/files/1/1751/9263/products/918piR5ZfiL.jpg?v=1630892620","https://cdn.shopify.com/s/files/1/1751/9263/products/61NM7L7VvbL.jpg?v=1630892620","https://cdn.shopify.com/s/files/1/1751/9263/files/714ewrO-GcL._SL1000.jpg?v=1707438885"],"price":16.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:43:46.891Z"},"share_url":"https://firestarter.network/l/lst_apIiZ4zR","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_apIiZ4zR' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Square - Hardback Book by Mac Barnett & Jon Klassen' and a budget_max comfortably above $16.99 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."]}}