Rivet: Open-Source Actor Orchestrator Beats Durable Objects

Durable state is the hidden tax on every AI agent project. You build the smart part, then spend two sprints figuring out where the conversation lives when the process crashes, how to avoid blocking on a database write mid-tool-call, and why Cloudflare Durable Objects keep evicting your sessions at the worst possible moment. Rivet is the open-source answer: an actor orchestrator that gives each agent session a persistent, lightweight process — 72 KB of RAM, a built-in SQLite database, WebSockets, and a 4.99ms p99 cold start — without locking you to any cloud vendor. Actors, Not Functions Rivet’s core primitive […]

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