The Agent Framework Moment: Why Flue and Eve Look so Much Alike

In May and June of 2026, two similar open-source agent frameworks, Flue and Eve, were launched by Cloudflare's Astro team and Vercel respectively, marking a significant step in the development of AI agents. Both frameworks allow developers to create AI agents declaratively using Markdown and TypeScript, with durable execution, sandboxes, and channels, signifying a convergence in the approach to building AI agents. Flue, which evolved from Astro's internal workflows, is multi-cloud and uses the Pi harness, while Eve is built on Vercel's stack and centers on a directory-based approach. Despite their similarities, neither framework includes native support for live web data, which requires an external tool like Firecrawl to access real-time information. The emergence of these frameworks suggests that AI agents are entering a framework era, similar to the web's evolution with tools like Next.js, with Cloudflare and Vercel leading the charge in shaping this new landscape.