diff --git a/CHANGELOG.md b/CHANGELOG.md
index da09c22..39dc54e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project are documented here. The format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project uses
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Changed
+- README opens with why the tool exists: agents can sweep orientations, print sequences and tower options in
+  parallel and iterate on plates in a way a person in the Studio GUI cannot; Studio stays the final pass.
+
 ## [0.6.0] - 2026-10-29
 
 A shambu project now opens in Bambu Studio with the process it was sliced with. On 2026-10-29 the owner opened a
diff --git a/README.md b/README.md
index a15189b..d4a6da0 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,15 @@
 [![license](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 ![python](https://img.shields.io/badge/python-3.11%2B-blue)
 
+**Why this exists.** Bambu Studio is a one-plate-at-a-time tool: you arrange, pick a profile, slice, read the
+estimate, and try again. Every variant costs a human a few minutes, so nobody explores more than a handful. shambu
+turns that loop into a command an agent can run many times over, in parallel: the same parts in six orientations,
+by object and by layer, with and without a prime tower, on one plate or two, each slice read back as grams and
+minutes (`shambu sweep` does exactly this). Because it ships as a Claude Code skill, several agents can prepare
+several plates at once, each with its own placement and reach checks, and iterate on the result in a way a person
+in the GUI cannot. Studio stays the place where you look at the plate and press Print; the search for the best plate
+happens before that, at machine speed, with every rule the slicer enforces checked first.
+
 STLs in, a checked Bambu Studio project out. `shambu` drives Bambu Studio's own command line to turn a short
 JSON spec into a `.3mf` project (or a sliced `.gcode.3mf` with time and filament estimates) with the parts placed,
 the process settings applied, the right filament on each part and the plate type set. It also inspects and