{"type":"firestarter.listing","listing":{"id":"lst_NQs4jJkg","product_name":"Replacement Long Sternum Strap","category":"Backpacks : Accessories","description":"This is a longer version of the standard sternum strap that ships with our backpacks. The webbing is 5\" longer and adjusts to a maximum of about 17\" (43 cm) from strap to strap.The sternum strap loops around the daisy chain webbing on our shoulder straps, and should be compatible with other similar shoulder straps.","images":["https://cdn.shopify.com/s/files/1/0004/4652/9572/files/Zpacks-0626-ReplacementSternumStraps-L.webp?v=1783354151"],"price":12.95,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:39.626Z"},"share_url":"https://firestarter.network/l/lst_NQs4jJkg","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_NQs4jJkg' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Replacement Long Sternum Strap' and a budget_max comfortably above $12.95 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."]}}