{"type":"firestarter.listing","listing":{"id":"lst_-4QP8fMn","product_name":"Nahvalur Eclipse Cobalt Black Fountain Pen","category":null,"description":"\nIntroducing the next evolution of the Nahvalur Eclipse, our iconic retractable fountain pen—now thoughtfully redesigned for an even smoother writing experience. With a newly engineered feed system that improves ink flow and an upgraded back cap fastening for added durability, Eclipse delivers refined performance in every detail. This release features two striking colorways: Hepatizon, a deep, ancient purple inspired by the legendary alloy, available with either classic silver or elegant rose gold trim; and Cobalt, a bold, modern blue accented with sleek black and rose gold. Both finishes showcase the Eclipse’s streamlined silhouette and signature one-handed retraction mechanism. Available in Fine and Medium nib sizes, the Eclipse is crafted for everyday use while standing out as a design-forward writing instrument—made to inspire, built to perform.Nahvalur Eclipse Cobalt Black Fountain Pen Specifications:\n\nPen Material: Aluminum\nTrim: Black\nNib: Stainless steel made by Nahvalur\nFilling System: Converter\nPen length, closed: 5.91 in. / 150mm\nPen length, open: 5.83 in. / 148mm\nPen Diameter, barrel: 0.55 in. / 13.91 mm\nPen weight (without ink): 1.2 oz. / 34g\nGift boxed with user guide and 1-year warranty\n\n","images":["https://cdn.shopify.com/s/files/1/0575/7177/files/Nahvalur-Eclipse-Cobalt-Black-Fountain-Pen_9baa8b52.jpg?v=1767175053","https://cdn.shopify.com/s/files/1/0575/7177/files/Nahvalur-Eclipse-Cobalt-Black-Fountain-Pen-2_0f506a49.jpg?v=1767175065","https://cdn.shopify.com/s/files/1/0575/7177/files/Nahvalur-Eclipse-Cobalt-Black-Fountain-Pen-3_bbb3b4b4.jpg?v=1767175077","https://cdn.shopify.com/s/files/1/0575/7177/files/Nahvalur-Eclipse-Cobalt-Black-Fountain-Pen-4.jpg?v=1767175079","https://cdn.shopify.com/s/files/1/0575/7177/files/Nahvalur-Eclipse-Cobalt-Black-Fountain-Pen-5.jpg?v=1767175080"],"price":99,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-18T20:45:59.604Z"},"share_url":"https://firestarter.network/l/lst_-4QP8fMn","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_-4QP8fMn' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Nahvalur Eclipse Cobalt Black Fountain Pen' and a budget_max comfortably above $99.00 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."]}}