Topic
Developer-facing frameworks for building, composing and hosting LLM agents, including Flue and Vercel's eve.
The open-source framework ships durable execution, sandboxing, approvals, subagents and evals in public preview. If the bet lands, your in-house harness is now maintenance.
Reality
Mastra raised $22M led by Spark Capital and launched a hosted platform in the same post. The framework was the cheap part; the runtime is where platform vendors already live.
Reality
The Agents SDK now carries durable execution, sandboxed code execution and a durable filesystem. Cloudflare's argument is that harnesses cannot own those problems, which makes them a platform decision.
Reality
Fred Schott's first stable release of Flue replaces file-based routing with React-style hooks, on the argument that an agent re-renders every turn and the harness defines it.
Reality