Rivet: scale and orchestrate agents on S3
Open-source actor orchestrator for agent workloads with 5ms cold starts, 72KB memory per actor, and SQLite databases backed by S3.
Why it matters
Replaces heavyweight per-agent sandboxes with lightweight actors: 39x faster actor creation than Cloudflare Durable Objects in the team's self-published benchmarks, at a tenth of the storage cost.
What you could build with it
An indie developer building a multi-agent coding assistant could run each agent session as a Rivet actor instead of a container, keeping hundreds of long-lived sessions warm for the cost of S3 storage and resuming them instantly.
Does it hold up?
Too early to judge: launched Nov 5 with 6.7k stars and one named migration (Amp), but all performance numbers are self-published with no independent verification yet.
Built with Rivet
- Rivet open-sources actor-based agent orchestrator built on S3aiweekly · Coverage of the launch, the S3-backed SQLite design, and the self-published Durable Objects comparison.
- Rivet: YC-backed platform brings lightweight agent orchestration to S3article · Walkthrough of the actor model, S3 anchoring, and cost pitch for multi-agent systems.
- Launch HN: Rivet (YC W23) – Scale and Orchestrate Agents on S3article · Signal-feed mirror of the Launch HN post, with founder background from the Diep and Krunker multiplayer games.
Learn more
First spotted on github: source.
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