Just because text isn't the best interface for agentic commerce doesn't mean agentic commerce is dead. The way I'm building my open-source marketplace[0], each store's storefront and cart are rendered right in the chat through MCP UI. So you can ask the agent to change something in your cart or add something, but you also have a real cart in the UI that you can tap and edit directly.

0. https://github.com/openshiporg/marketplace