{"type":"firestarter.listing","listing":{"id":"lst_LTzjd4VD","product_name":"Tom's Studio - Fountain Pen Nibs","category":"Fountain pens","description":"Beauty is in the eye of the pen holder – please read my FAQs to help you make the best choice when choosing your nib.Made exclusively for our fountain pens, all of my nibs are tipped with incredibly hard-wearing iridium for super smooth writing, and are plated in a 14k gold or Stainless Steel for a classically stunning look. As a bonus all nibs can be interchanged so you can easily write in different styles whenever it suits you.\n\nFine - A springy and smooth nib perfect for delicate thin strokes, with a smidge of flex if you're feeling creative.\n\nMedium - The go-to nib for the author, journaller or note-taker. This is a firm and consistent nib for everyday writing.\n\n\nCursive Italic B -  A specialised nib designed to produce line variations in handwriting. It is a type of italic nib that has a smooth, rounded tip that is slightly flattened on the sides. This flattening creates two distinct writing surfaces: a broader downstroke (1mm(+-0.1)) and a thinner horizontal stroke (hairline - 0.2 mm).\n\n\nArchitect - This is the opposite of the Italic nib, with a broad cross stroke and a thin down stroke. It's my personal favourite – the effortless big juicy lines make it my go-to for sketching and everyday use. It has nice line variation and strokes around 1.2mm at it's thickest (horizontal) and 0.3mm on the downstroke. You can also use the nib upside down for a super fine hairline stroke.\n\nExtra Fine Semi-Flex - A beautiful extra fine fountain pen nib with flex! This is a great middle-ground between the Pro Flex and our classic fountain pen nib, with its smooth writing experience and minimal maintenance. By applying a little pressure the nib will flex from 0.5mm to 1.5mm.\n\nTitanium Flex - This beauty is the ultimate flex as it's a lot softer than stainless steel nibs. It's perfectly paired with our fountain pens to practice calligraphy when you just want to get cracking without having to prep all your nibs and ink or you're out and about. Titanium is also bombproof so it will","images":["https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-collection-image-1.jpg?v=1745323698","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-collection-image-2.jpg?v=1745323698","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-fine-gold.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-fine-stainless-steel.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-medium-gold.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-medium-stainless-steel.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-cursive-italic-b.png?v=1772120449","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-architect-b.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-semi-flex-gold.jpg?v=1772120449","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-semi-flex-stainless-steel.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fountain-pen-nib-titanium-flex.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/fude-fountain-pen-nib.jpg?v=1737634482","https://cdn.shopify.com/s/files/1/0089/6129/4417/files/zoom-fountain-pen-nib.jpg?v=1737634482"],"price":19,"currency":"USD","in_stock":true,"inventory_qty":199980,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:24.096Z"},"share_url":"https://firestarter.network/l/lst_LTzjd4VD","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_LTzjd4VD' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Tom's Studio - Fountain Pen Nibs' and a budget_max comfortably above $19.00 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."]}}