---
title: "Discussion on \"What is an agent runtime? What we learned splitting harness, runtime and sandbox into three processes\" | Hashnode"
description: "Discussion on \"What is an agent runtime? What we learned splitting harness, runtime and sandbox into three processes\". An agent runtime keeps an agent's work alive between turns. How it differs from a harness and a sandbox, from running all three separately."
url: "https://hashnode.com/posts/what-is-an-agent-runtime-what-we-learned-splitting-harness-runtime-and-sandbox-into-three-processes/6abb2d71a28e37cf0883c296"
---

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# [What is an agent runtime? What we learned splitting harness, runtime and sandbox into three processes](https://gobare.hashnode.dev/what-is-an-agent-runtime-what-we-learned-splitting-harness-runtime-and-sandbox-into-three-processes?utm_source=hashnode&utm_medium=feed)

An agent runtime keeps an agent's work alive between turns. How it differs from a harness and a sandbox, from running all three separately.

Sep 29 · 7 min read · gobare.hashnode.dev  
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