---
title: Reference
description: The heed helper, where Heed keeps its files, and the environment variables it reads.
url: https://docs-v3-preview.elastic.dev/reference
---

# Reference
- [The heed CLI](https://docs-v3-preview.elastic.dev/reference/cli): the helper agents' hooks call.
- [Files and locations](https://docs-v3-preview.elastic.dev/reference/files): config, cache, socket and hook files.
- [Environment variables](https://docs-v3-preview.elastic.dev/reference/environment): what Heed sets in panes, and what it reads.