{"type":"firestarter.listing","listing":{"id":"lst_e_C8oCnO","product_name":"(Used) Harness","category":null,"description":"This Second Track item will be a mystery color, slightly used, but still has lots of life left in it. You might find a few pieces of fur or a bit of dirt on it, but your dog won't mind. If you won't be happy with any color harness, head on over to our full-price harnesses, where you can choose whatever color you want.\n\nTwo e-coated iron d-ring attachment points\nTop handle for control or assistance over objects\n\nReflective strips on handle for night visibility\n\nLightweight &amp; breathable\nOverall weight: S = 4.85oz, M = 6.7oz, L = 8oz\n\nSizing\n\nWhen measuring the chest: Be sure to measure around the widest part of your dogs chest - right behind the front legs!\nWhen measuring the neck: Be sure to measure around the widest part of your dogs neck - at the base where the harness will sit, not where a collar sits!\nIf your pup falls between sizes or they are still growing or filling out, we recommend sizing up!\n*Heads up! Our harness sizing has changed: We added a 'S' size - what was previously labelled as 'S/M' is now just 'M', and what was previously labelled as 'M/L' is now just 'L'. Please be sure to measure your pup!\nRecommended Fit\nTo put the harness on, simply slip the harness over the dog's head, and clip the two side release buckles at the chest - all 4 paws stay on the ground! Both the neck and shoulder straps are fully adjustable. We designed our harness to fit a bit shorter for maximum breathability. Make sure your pup has enough space between their armpit and the straps, and its a snug but comfy fit!","images":["https://cdn.shopify.com/s/files/1/1064/6998/files/st-harn-2026.jpg?v=1773861979"],"price":28.8,"currency":"USD","in_stock":true,"inventory_qty":29997,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:24.625Z"},"share_url":"https://firestarter.network/l/lst_e_C8oCnO","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_e_C8oCnO' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy (Used) Harness' and a budget_max comfortably above $28.80 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."]}}