{"type":"firestarter.listing","listing":{"id":"lst_npjpQnuk","product_name":"Tachikawa G Nib, Set of 3","category":"Nib","description":"Tachikawa G Pen Nib, Set of 3Tachikawa G Superior No. 3 Made in Japan\n \n \nThis is a chrome plated pen nib made for comics, and also widely used for calligraphy and general drawing and sketching.  It is considered the most flexible of the \"G\" nibs, though most users can't distinguish much difference.  G nibs have medium flexibility, making them easy to use and excellent for beginning calligraphers especially.  The Tachikawa G is my personal favorite.\n \n© Greenleaf &amp; Blueberry 2020www.greenleafblueberry.com","images":["https://cdn.shopify.com/s/files/1/1696/5931/products/IMG_4088.jpg?v=1606501583","https://cdn.shopify.com/s/files/1/1696/5931/products/IMG_4089.jpg?v=1606501583"],"price":4.2,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:24.039Z","product_rating":null,"product_rating_count":0,"seller_rating":null,"seller_rating_count":0,"units_sold":0,"reviews":{"count":0,"top":[]},"videos":[]},"share_url":"https://firestarter.network/l/lst_npjpQnuk","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_npjpQnuk' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Tachikawa G Nib, Set of 3' and a budget_max comfortably above $4.20 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."]}}