I Built an AI Agent That Shops the Internet For You (Claude Code Tutorial)

I gave an AI agent a goal and a budget — "a home studio under $2,500" — and it shopped the entire internet for me: live prices, real buyer reviews, real photos, and a sourced parts list under budget. No code. Here's exactly how I built it with Claude Code. This is a full build tutorial: the architecture idea (from Anthropic's own commerce-agents blueprint), the "PRD trick" that keeps an AI coding agent from drifting, wiring up OpenRouter as the brain and Decodo's Web Scraping API as the eyes, and deploying the whole thing live on Railway — all in one sitting, no prior coding experience requir