Cloudflare opens its Agents SDK primitives to outside frameworks, starting with Flue

Category: Agentic coding
Status: confirmed
Sources: Cloudflare blog, Cloudflare Agents SDK changelog
Summary: Cloudflare announced on 2026-06-17 that it is exposing the Agents SDK primitives, including durable execution, to outside agent frameworks and harnesses, with Flue as the first supported framework. Flue is an open-source TypeScript agent framework from the team behind Astro that reached a 1.0 beta on 2026-06-16; it is headless and programmable, triggered by API calls, webhooks, or cron, and deployable to Node.js or Cloudflare Workers. Cloudflare frames a three-layer stack: a framework such as Flue for project structure, a harness for the agentic loop, and the Agents SDK for durable primitives.
Why it matters: Decoupling durable-execution primitives from any single harness lets teams run third-party agent frameworks on Cloudflare without rewriting orchestration, which matters for production agent deployments.