I spent today testing Anthropic's new Managed Agents release. The article covers what managed agents are (and how they differ from Claude Code/Cowork), the four building blocks (agent, environment, session, events), pricing, what Notion/Rakuten/Asana/Sentry/Vibecode have built with them, and a walkthrough of building a feedback collection agent connected to Notion and deployed via Claude Code to Vercel. Happy to answer questions about the build process.