{"type":"firestarter.listing","listing":{"id":"lst_YXB6rBnq","product_name":"Circle- Hardcover Book by Mac Barnett & Jon Klassen","category":"Curated","description":"Multi-award-winning, New York Times best-selling duo Mac Barnett and Jon Klassen deliver the final wry and resonant tale about Triangle, Square, and Circle.This book is about Circle. This book is also about Circle’s friends, Triangle and Square. Also it is about a rule that Circle makes, and how she has to rescue Triangle when he breaks that rule. With their usual pitch-perfect pacing and subtle, sharp wit, Mac Barnett and Jon Klassen come full circle in the third and final chapter of their clever shapes trilogy.","images":["https://cdn.shopify.com/s/files/1/1751/9263/products/91WdYUAWmvL.jpg?v=1630892452","https://cdn.shopify.com/s/files/1/1751/9263/products/61ZX31S3bPL.jpg?v=1630892455"],"price":16.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:43:46.901Z"},"share_url":"https://firestarter.network/l/lst_YXB6rBnq","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_YXB6rBnq' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Circle- Hardcover 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."]}}