Cloudflare ships Flue, a declarative TypeScript agent framework from the Astro team.

Published June 17, Flue lets you "describe what an agent knows" (model, skills, sandbox, instructions) instead of scripting behavior. It ships pre-wired Slack/GitHub/Linear/Discord channels with event verification, a @flue/react library that streams agent state to the frontend, "Durable Streams" append-only logs for crash recovery, sandboxed TypeScript via codemode (isolates start in <10ms at $0.002/load), and a SQLite-backed virtual filesystem with grep/diff. (Cloudflare) It runs as long-lived Node processes anywhere or as Durable Objects on Cloudflare, which makes the Agents SDK a runtime any framework can target. The crash-recovery-as-a-primitive design is the part I'd steal.