---
title: "hadley 0.4.0"
description: "The fourth release of hadley: every new site gets an AGENTS.md for your coding agent, hems and punch get a template for notes, and a site set to light or dark stays that way."
url: "https://mko.run/notes/2026-11-10-hadley-0.4.0/"
language: "en"
published: 2026-11-10
tags: ["hadley"]
---
# hadley 0.4.0

The fourth release of hadley: every new site gets an AGENTS.md that tells your coding agent which documentation to read for what, hems and punch get a template for notes, and a site set to light or dark stays that way. How far an agent gets with hadley's documentation alone, [I measured](https://hadley.sh/agent-test/): five everyday tasks in under four minutes.