{"type":"firestarter.listing","listing":{"id":"lst_I04oYca9","product_name":"The Essential Calligraphy Ruler","category":"Calligraphy","description":"The best designs are often the most simple and master maker and penman, Aquino Silva's Calligraphy rulers are no exception. \nI scratched my head trying to think of a simple calligraphy guide solution but nothing I came up with compared to these clever rulers.  If you can't beat em join em! So instead, I decided to stock Aquino's incredible guides, just watch the video to see what I'm talking about.\nThe Rulers are designed for Engrosser script which is perfect for copperplate and modern calligraphy, and for those who are diving deep into the world of calligraphy we also offer his Spencerian guides.\nI call them the Essential Calligraphy Ruler because you'll wonder how you managed without one previously!\nEach ruler comes in a beautifully designed and printed uncoated paper sleeve. All the way from sunny Macau, Tom's Studio is the only UK based store to offer them. ","images":["https://cdn.shopify.com/s/files/1/0089/6129/4417/products/aquino-da-silva-calligraphy-ruler-engrosser.jpg?v=1732791260","https://cdn.shopify.com/s/files/1/0089/6129/4417/products/aquino-da-silva-calligraphy-ruler-spencerian.jpg?v=1732791247","https://cdn.shopify.com/s/files/1/0089/6129/4417/products/aquino-da-silva-calligraphy-ruler-both.jpg?v=1732791305","https://cdn.shopify.com/s/files/1/0089/6129/4417/products/aquino-da-silva-calligraphy-ruler-engrosser-2.jpg?v=1732791279","https://cdn.shopify.com/s/files/1/0089/6129/4417/products/aquino-da-silva-calligraphy-ruler-spencerian-2.jpg?v=1732791293"],"price":19,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:24.243Z"},"share_url":"https://firestarter.network/l/lst_I04oYca9","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_I04oYca9' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy The Essential Calligraphy Ruler' 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."]}}