Klein Void — Development skill for Claude Code

Klein Void

A terminal theme for reading. Specifically: for reading the thousands of lines of prose that Claude Code now puts in your terminal every day.

The problem

Your terminal theme was built for `git status` and compiler errors — short bursts of text you scan, not read. Claude Code changed that. A single session generates pages of explanations, research summaries, code reviews, and planning documents. You're now doing sustained reading in a monospace font on a dark background for hours.

Most terminal themes fail this use case in ways you feel but can't name: eye strain at hour three, squinting at dim UI text, losing your place in a wall of output. The root cause is contrast — not too little of it, but the wrong kind. WCAG 2.x, the accessibility standard your theme probably targets, [systematically overstates contrast for dark color pairs](https://github.com/Myndex/SAPC-APCA/blob/master/documentation/WhyAPCA.md). A color pair can pass WCAG AA (4.5:1) and still be functionally unreadable on a dark background.

What this is

Klein Void is an ANSI-16 color palette verified against [APCA](https://git.apcacontrast.com/documentation/APCA_in_a_Nutshell.html) (Advanced Perceptual Contrast Algorithm), the contrast method in the W3C's WCAG 3.0 Working Draft. Every color is assigned a role based on how Claude Code actually uses it, and gated to a contrast threshold appropriate for that role:

Role	ANSI slot	Example in Claude Code	APCA gate
Body prose	foreground	Explanations, code reviews	Lc ≥ 90
Subtle text	white (7)	Secondary UI text	Lc ≥ 75
User echo	bright black (8)	Your message after submission	Lc ≥ 45
Error	red (1)	Error messages	Lc ≥ 60
Success	green (