---
title: "What is environment runtime?"
description: "An environment runtime is infrastructure that builds, verifies, reproduces and forks the environment an AI agent runs inside, treating the environment itself as the product."
url: "https://www.promigence.ai/glossary/environment-runtime"
site: "Promigence"
---

# What is environment runtime?

An environment runtime is infrastructure that builds, verifies, reproduces and forks the environment an AI agent runs inside, treating the environment itself as the product.

A sandbox provider sells a box that starts: it boots fast, it isolates the process, and what happens inside is your problem. An environment runtime sells an environment that is known good, it ran its own tests before you got it, it reproduces exactly from a hash, and a thousand copies of it are all the same.

The distinction matters because cold start has converged industry-wide to a floor of tens of milliseconds. What still differs by orders of magnitude is how many of your environments were silently broken, and whether the bill is predictable.

## Related
- https://www.promigence.ai/glossary/verified-environment
- https://www.promigence.ai/glossary/episode
- https://www.promigence.ai/glossary/snapshot-fork
- https://www.promigence.ai/glossary/validity-report