Building Co-Shop: A Shared Cart for Humans and AI Agents with WebMCP

Description and use

<p><strong>The problem with "agentic" web apps today</strong></p> <p>Ask most AI agents to shop for you online right now, and here's roughly what happens under the hood: the agent opens a headless browser, loads the page, tries to parse the DOM, guesses which is the "Add to Cart" one, clicks it, waits, re-parses, and hopes nothing changed in the layout since the model was trained on how that site "usually" looks.</p> <p>It works sometimes. It's also slow, brittle, and completely opaque to the human sitting there. You ask an agent to "add a few vegetarian dinners to my cart," it goes away for a

Problem

<p><strong>The problem with "agentic" web apps today</strong></p> <p>Ask most AI agents to shop for you online right now, and here's roughly what happens under the hood: the agent opens a headless browser, loads the page, tries to parse the DOM, guesses which is the "Add to Cart" one, clicks it, waits, re-parses, and hopes nothing changed in the layout since the model was trained on how that site "usually" looks.</p> <p>It works sometimes. It's also slow, brittle, and completely opaque to the human sitting there. You ask an agent to "add a few vegetarian dinners to my cart," it goes away for a

Outcome

<p><strong>The problem with "agentic" web apps today</strong></p> <p>Ask most AI agents to shop for you online right now, and here's roughly what happens under the hood: the agent opens a headless browser, loads the page, tries to parse the DOM, guesses which is the "Add to Cart" one, clicks it, waits, re-parses, and hopes nothing changed in the layout since the model was trained on how that site "usually" looks.</p> <p>It works sometimes. It's also slow, brittle, and completely opaque to the human sitting there. You ask an agent to "add a few vegetarian dinners to my cart," it goes away for a

Evidence

Building Co-Shop: A Shared Cart for Humans and AI Agents with WebMCP

Source