A set of user-interface design rules covering color, typography, spacing, layout, and accessibility basics. A user interface is the visible part of software that people interact with.

Creating design systems, choosing visual styles, setting type and spacing scales, and checking contrast.

It gives developers practical standards for making screens consistent, readable, and easier to use.

ui-design — Cursor rule for Cursor by kok-o

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/kok-o/koko-contextos-agents

Made for: Cursor.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/rules/kok-o/koko-contextos-agents/ui-design/github.svg)](https://agentmods.dev/rules/kok-o/koko-contextos-agents/ui-design)

Your own site

<a href="https://agentmods.dev/rules/kok-o/koko-contextos-agents/ui-design"><img src="https://agentmods.dev/badge/rules/kok-o/koko-contextos-agents/ui-design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/rules/kok-o/koko-contextos-agents/ui-design"><img src="https://agentmods.dev/badge/rules/kok-o/koko-contextos-agents/ui-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Nothing until a file matches its globs; then the whole rule loads.

When invoked 1,018 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.01018
Opus 5	$0.00000	$0.00509
Sonnet 5	$0.00000	$0.00204
Haiku 4.5	$0.00000	$0.00102

Measured 5d ago against content hash eccf5638b410, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

ui-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/ui-design.mdc · 128 lines

How it starts

The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: UI Design

UI Design

Overview

A brief summary of what the skill does and its core philosophy.

When to Use

Context for when this skill is applicable.

Rules & Patterns

UI Design — Best Practices

Design System Foundations

Color

Never use generic colors — curate a harmonious palette
Always tint — no pure black (#000), no pure gray. Add a subtle warm or cool tint
Color roles: primary (action), secondary (accent), neutral (text, borders), semantic (error, success, warning, info)
Dark mode: design intentionally, not just invert. Surface hierarchy: background < surface < elevated
Contrast: 4.5:1 minimum for body text, 3:1 for large text

Typography

Never use browser defaults — choose a curated font (Inter, Outfit, Geist, Sora)
Type scale: use a modular scale (1.25 ratio) — 12, 14, 16, 20, 24, 32, 40, 48
Font weights: Regular (400), Medium (500), Semibold (600), Bold (700). Don't use all of them — pick 2-3
Line height: 1.5 for body, 1.2 for headings, 1.6 for long-form text
Max line width: 65-75 characters for readability

Spacing

Use a 4px grid — all spacing should be multiples of 4
Spacing scale: 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 80, 96
Consistency — same spacing between similar elements
Whitespace is design — don't fill every pixel

Layout

Grid system: 12-column grid for desktop, 4-column for mobile
Visual hierarchy: size, weight, color, spacing, position
F-pattern/Z-pattern — for content-heavy pages
Group related items — use proximity and boundaries

Component Patterns

Buttons

Clear hierarchy: Primary > Secondary > Ghost/Text
Consistent sizing: sm (32px), md (40px), lg (48px)
States: default, hover, active, disabled, loading
Always accessible: sufficient contrast, focus indicator

Forms

Labels above inputs (not floating labels for critical forms)
Clear error states with inline messages
Logical tab order
Progressive disclosure — don't show all fields at once

Read the full file on GitHub · 128 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

5d ago First seen · 128 lines · 0 tokens per session scan A eccf5638b410

Subscribe to this mod's changes

ui-design is a cursor rule published in the GitHub repository kok-o/koko-contextos-agents (2 stars, last pushed 5d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,018 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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