deibler/universal-design-principles

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What this is

A working library of design principles, packaged as portable Agent Skills plus native plugin metadata for Claude Code, Codex, and Cursor. Install one or more plugins and your agent gains access to curated skills that fire automatically whenever you work on UX, UI, or product design — regardless of design system, SDK, framework, or platform.

Each principle is built as a reference-grade entry: a router-style SKILL.md (~350–500 lines), 2–4 sub-aspect skills for context-specific application (~200–300 lines each), and per-skill references/ deep-dive files with origins, research lineage, and worked patterns. The result is a library an agent can apply with the same depth as a senior designer who has internalized the canon.

Why a plugin marketplace?

Many products today are built and reviewed by AI agents. The quality of their design judgment depends heavily on what they’ve been taught to attend to. Without a working library of principles, an agent will produce designs that are competent on average but blind in specific ways — the typography will drift, hierarchy will collapse on the third screen, the error states will be afterthoughts, the interaction patterns will be inconsistent across surfaces.

This marketplace gives your agent the same canon that experienced designers have internalized over years. Instead of one giant prompt, the canon is split across five composable plugins so you can install only what you need: