Cloudflare ships Flue, the Astro team's open-source TypeScript agent framework, as a runtime on its Agents SDK
Published June 17, 2026, Flue (built by the Astro team, now at Cloudflare) is a declarative TypeScript agent framework where you 'describe what an agent knows' — model, skills, sandbox, instructions — rather than scripting its behavior. It ships pre-wired Slack/GitHub/Linear/Discord channels with event verification, a @flue/react library that streams agent state and tool execution into the frontend, 'Durable Streams' append-only logs for crash recovery, sandboxed TypeScript via @cloudflare/codemode (isolates start in <10ms at $0.002/load), and a SQLite-backed virtual filesystem with read/write/grep/diff. It runs as long-lived Node processes on any VM or as Durable Objects on Cloudflare; v1.0 Beta shipped the same week, making the Agents SDK a runtime any framework can target.
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