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.
npx skills add dylantarre/design-system-skills --skill dark-modegit clone --depth 1 https://github.com/dylantarre/design-system-skillsWrote 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.
[](https://agentmods.dev/skills/dylantarre/design-system-skills/dark-mode)<a href="https://agentmods.dev/skills/dylantarre/design-system-skills/dark-mode"><img src="https://agentmods.dev/badge/skills/dylantarre/design-system-skills/dark-mode/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.
<a href="https://agentmods.dev/skills/dylantarre/design-system-skills/dark-mode"><img src="https://agentmods.dev/badge/skills/dylantarre/design-system-skills/dark-mode.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00043 | $0.04081 |
| Opus 5 | $0.00022 | $0.02041 |
| Sonnet 5 | $0.00009 | $0.00816 |
| Haiku 4.5 | $0.00004 | $0.00408 |
Grade A, and why
dark-mode 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 566 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dark Mode Implementation
Overview
Implement robust dark mode using semantic color tokens, CSS custom properties, and system preference detection. Creates a theme system that's maintainable, accessible, and works across frameworks.
When to Use
- Adding dark mode to an existing project
- Setting up a theme system from scratch
- Converting hardcoded colors to semantic tokens
- Implementing system preference detection
- Building a theme toggle component
Quick Reference: Theme Architecture
| Layer | Purpose | Example |
|---|---|---|
| Primitive tokens | Raw color values | --color-blue-500: #3b82f6 |
| Semantic tokens | Purpose-based aliases | --color-primary: var(--color-blue-500) |
| Theme tokens | Mode-specific values | --color-bg: var(--color-gray-50) in light |
| Component tokens | Component-specific | --button-bg: var(--color-primary) |
The Process
- Audit existing colors: Find all color usage in codebase
- Define primitive palette: Use color-scale skill if needed
- Create semantic tokens: Map primitives to purposes
- Define theme tokens: Light and dark values
- Choose switching mechanism: CSS classes, data attributes, or media query
- Add system detection:
prefers-color-scheme - Implement persistence: localStorage or cookies
- Handle edge cases: Images, shadows, third-party components
Implementation Checklist
Copy this checklist and track progress:
Dark Mode Implementation:
- [ ] Audit colors in codebase (grep for hex, rgb, hsl, color names)
- [ ] Create semantic token layer (bg, text, border, surface, interactive, status)
- [ ] Define light and dark theme values for all semantic tokens
- [ ] Implement switching mechanism (data-theme attribute recommended)
- [ ] Add system preference detection (prefers-color-scheme)
- [ ] Add inline script in <head> to prevent flash of wrong theme
- [ ] Build toggle component with localStorage persistence
- [ ] Handle edge cases (images, shadows, third-party components, form inputs)
- [ ] Test contrast ratios meet WCAG AA in both themes
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.
- 12d ago First seen · 566 lines · 43 tokens per session scan A 56d6cb6ae5b2
dark-mode is a skill published in the GitHub repository dylantarre/design-system-skills (43 stars, last pushed 8mo ago), licensed MIT. It adds 43 tokens to every session and 4,081 once invoked, about $0.0002 per session on Opus 5. 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 2026-08-30.
Other skills, from other repositories
chakra-ui-builder
Build responsive, accessible UI components and layouts using Chakra UI v3, install or configure Chakra UI in new and existing projects, and design scalable themes using tokens, semantic tokens, recipes, and slot recipes. Use this skill whenever a user asks to build, create, or generate any UI component, page, form…
visual-ralph
Visual Ralph orchestration for frontend UI from generated references, static references, or live URL targets, using $ultragoal with built-in visual verdict and pixel-diff evidence until the implementation matches and leaves a reproducible design system.
frontend-ui-dark-ts
Build dark-themed React applications using Tailwind CSS with custom theming, glassmorphism effects, and Framer Motion animations. Use when creating dashboards, admin panels, or data-rich interfaces with a refined dark aesthetic.
reveal-hover-effect
Build cursor-following spotlight reveals that expose a second aligned image through a soft radial mask. Use for hover-to-color, before-and-after, x-ray, material, texture, product-detail, and illustrated hero effects where a desaturated or embossed base image should remain visible while another treatment follows an…
frontend-visual-qa
Audits already-rendered web, landing-page, HTML deck/slide, browser tool/game, dashboard/admin, design-system, and desktop UIs using real-browser or native-app journeys, inspected screenshots, DOM geometry, responsive or projection viewports, and a bundled Playwright sweep. Use after UI implementation to find…
prototype-web
A clickable, high-fidelity web product prototype with navigation, a hero section, feature cards, steps, social proof, and optional pricing. It is designed to resemble a finished landing page while remaining a prototype.