{"type":"firestarter.listing","listing":{"id":"lst_JWbB6SHo","product_name":"Large Optimist - 18L Backpack","category":"Backpack","description":"The older sibling to our best selling 10L mini backpack, the 18L Optimist is roomier, tougher, and ready for even more adventure! An infinitely practical backpack, with a sleek silhouette and exceptionally durable design, it's highly functional with minimal fuss.\n\n\nLightweight, durable, and versatile, this power pack is ready for whatever your day brings. At just 12 ounces, it's comfortable and light enough for any day trip, and its stylish, water-resistant fabric transitions well as you go about your day, from hikes in the woods to a city-touring adventure. Carry your essentials with you in one, do-it-all pack, complete with two side stash sleeves and an outer zipper pocket.\n","images":["https://cdn.shopify.com/s/files/1/0040/7401/2790/products/ff18bp43-18loptimist-navy.png?v=1710360081","https://cdn.shopify.com/s/files/1/0040/7401/2790/files/Backpacks29_36efdc80-eb11-4bbc-b239-e423be4f8859.jpg?v=1710360081","https://cdn.shopify.com/s/files/1/0040/7401/2790/files/Backpacks35_88cae44d-e38b-4edc-b75b-8432231599c1.jpg?v=1710360081","https://cdn.shopify.com/s/files/1/0040/7401/2790/products/ff18bp21-ecopak-18L-optimist-jet-black_cb6fdc77-8a25-43fe-90c9-2eba12e11bb1.png?v=1710360081","https://cdn.shopify.com/s/files/1/0040/7401/2790/products/ff18bp21pocket.png?v=1710360081","https://cdn.shopify.com/s/files/1/0040/7401/2790/products/DSC_0068-2.jpg?v=1710360081","https://cdn.shopify.com/s/files/1/0040/7401/2790/products/ff18bp30.png?v=1710360081","https://cdn.shopify.com/s/files/1/0040/7401/2790/files/18L_Optimist_-_Brick_Red.png?v=1764868430"],"price":110,"currency":"USD","in_stock":true,"inventory_qty":39996,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:39.229Z"},"share_url":"https://firestarter.network/l/lst_JWbB6SHo","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_JWbB6SHo' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Large Optimist - 18L Backpack' and a budget_max comfortably above $110.00 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."]}}