Show HN: kassette – Durable agent workflows backed by object storage

Category: library

Tags: durable-execution, workflow, state-management

Score: 7.0/10 (Innovation: 6, Technical: 7, Documentation: 8, Utility: 7)

kassette is an embeddable TypeScript library that adds durable execution to agentic workflows using an append-only journal backed by object storage or filesystem. It solves the problem of costly retries in long-running LLM-based workflows by replaying completed steps instead of re-executing them, making it interesting for serverless and stateful agent architectures without introducing new infrastructure.

Target audience: backend devs, data engineers, ai engineers

Repository: https://github.com/lostinpatterns/kassette · TypeScript · MIT

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