Launch HN: Rivet (YC F25) – Scale and Orchestrate Agents on S3

Rivet is a new orchestration platform (YC F25) designed to run AI agents efficiently at scale using an actor model backed by S3 storage. It achieves 4.99ms p99 cold starts and uses only 72KB per actor by sharing node processes instead of using heavyweight sandboxes, while providing SQLite databases with SSD-speed performance. The open-source, self-hostable platform supports multiple languages and integrates with popular AI coding tools like Claude Code and Cursor.