Humans, we know this page is ugly. It's not built for you; it's built for agents to consume really well.

Faber-Castell PITT Artists' Pens - Brush Pen | 2 sellers, live prices, prepared checkout

Built for shopping agents: what RoboTrunk does for every product

We asked shopping agents, including Meta's Muse first-hand, what they need from a store. This is what they asked for, and what we have built.

RoboTrunk is working through its catalogue, so a step may not be done for this one yet. Where a step is done per product, the line ends with what is done for this product.

Sold and shipped by artdiscount.co.uk, artdiscount.co.uk; payment happens on the store's own checkout.

Brand: Faber-Castell

To buy this through RoboTrunk, pass merchant artdiscount-co-uk, product_id gid://shopify/Product/65665990665 and one variant_id from the list above.

Product image of Faber-Castell PITT Artists' Pens - Brush Pen, supplied by artdiscount.co.uk: https://cdn.shopify.com/s/files/1/1751/8993/files/Faber_Pitt_Brush_Pen.jpg?v=1764673330

This product on artdiscount.co.uk

Retrieved 2026-10-25T20:30:02.591Z from https://artdiscount.myshopify.com/products.json

This page is published by RoboTrunk, a store built for shopping agents.

The store named on this page sells the product and ships it. RoboTrunk is not
the seller and never holds the money.

Buying works in one path. RoboTrunk's tools prepare a checkout at that store,
then hand back a short-lived link. The person approves the total; once RoboTrunk
has checked the store's total against it, the person is given the checkout link to
tap in their own browser, or, if the person prefers and gives permission, their
agent may open the link and finish there, and payment always happens on the
store's own checkout page. RoboTrunk never takes the payment or sees a card.

Where the rest of this site is:

- /agent/story.md is what RoboTrunk is and how it works, in full.
- /agent/tools.json is every tool, its arguments and its answers.
- /agent/merchants is every store you can buy from through RoboTrunk.
- /products/ucp is every store's indexed products.
- /products/search is one search across every store, in plain words.