{"type":"firestarter.listing","listing":{"id":"lst_CWYtQi6y","product_name":"K55K Mercator","category":"Axes / Knives","description":"Developed in 1867 by Heinrich Kaufmann & Sons in Solingen. The original Mercator, or better known as the Black Cat K55K: \"K\" for Kaufmann, \"55\" for Hochstraße 55 (the original company address), and the final \"K\" for Katze—the cat emblem that was hand-painted on each knife. The novel, utilitarian design proved so essential that it quickly spread among factory workers, farmers, craftsmen, and eventually, American GIs who brought them home after World War II, where it gained cult status. This is the knife that defined what a working folder should be: slim enough to disappear in any pocket, substantial enough for the best of cutting tasks.\nThe lockback mechanism represents early knife engineering at its most elegant: a curved spring bar that locks the blade open with positive engagement and releases with deliberate thumb pressure. The blade is made of carbon steel and maintains an exceptional edge. \nOtter-Messer acquired the Mercator pattern from Kaufmann in 1995 and has maintained production standards established over 140 years ago. ","images":["https://cdn.shopify.com/s/files/1/0674/2985/9558/files/MK-PDP-LAYOUTS2.jpg?v=1779459511","https://cdn.shopify.com/s/files/1/0674/2985/9558/files/MK-PDP-LAYOUTS3.jpg?v=1779459524","https://cdn.shopify.com/s/files/1/0674/2985/9558/files/MK-PDP-LAYOUTS4.jpg?v=1779459540","https://cdn.shopify.com/s/files/1/0674/2985/9558/files/MK-PDP-LAYOUTS5.jpg?v=1779459563","https://cdn.shopify.com/s/files/1/0674/2985/9558/files/MK-PDP-LAYOUTS6.jpg?v=1779459575","https://cdn.shopify.com/s/files/1/0674/2985/9558/files/K55K-PDP-LAYOUTS.jpg?v=1779380264"],"price":75,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:30:24.477Z"},"share_url":"https://firestarter.network/l/lst_CWYtQi6y","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 ","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_CWYtQi6y' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy K55K Mercator' and a budget_max comfortably above $75.00 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."]}}