{"type":"firestarter.listing","listing":{"id":"lst_TzfTz5Rb","product_name":"Model 45 Fountain Pen - Classic Black","category":"Fountain Pen - Model 45","description":"\nSELLING CONDITION: NEW OLD STOCK. This is the original 45 fountain pen design which has been retired. If you are interested in the current version of this popular pen, check out the 45 Cor collection.\n♦ Dimensions:.550\" cap diameter.510\"  barrel diameter 4.45\" capped length5.60\" cap posted length (including nib)4.12\" barrel only length (including nib).383\" grip section at thinnest point (curved)weight without ink = .42oz / 11.95g; barrel holds approximately 2.1ml of ink when eyedroppered♦ A smaller pocket sized fountain pen♦ Classic lines w/ no clip♦ Cartridge or eye dropper filled. Is too small for a traditional converter. There are small squeeze converters on the market or a spent cartridge can be re-flled via syringe. ♦ Precision posting for firm grip on the cap while posted.♦ No. 5 size nib♦ Lifetime warranty♦ Made in USA in our NC facility♦ Shipped with a Franklin-Christoph single pen zippered pouch.","images":["https://cdn.shopify.com/s/files/1/0023/7679/4187/files/45ClassicBlackFP.jpg?v=1779291214","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/45ClassicBlackart.jpg?v=1779291221"],"price":79.25,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:19.931Z"},"share_url":"https://firestarter.network/l/lst_TzfTz5Rb","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_TzfTz5Rb' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Model 45 Fountain Pen - Classic Black' and a budget_max comfortably above $79.25 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."]}}