What is ddg-design-system?

A set of instructions for using the shared design system in iOS and macOS interfaces. A design system is a library of approved colors, fonts, icons, and reusable interface components.

Use it when creating, changing, or reviewing Apple-platform screens, including typography, colors, icons, spacing, buttons, and other repeated styling.

It prevents agents from inventing inconsistent visual styles or assuming that a component exists. It directs them to check the repository and Figma design intent first.

How duckduckgo/apple-browsers configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to duckduckgo/apple-browsers. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/duckduckgo/apple-browsers/main/.claude/skills/ddg-design-system/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/duckduckgo/apple-browsers

Made for: Claude Code.

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/skills/duckduckgo/apple-browsers/ddg-design-system/github.svg)](https://agentmods.dev/skills/duckduckgo/apple-browsers/ddg-design-system)

Your own site

<a href="https://agentmods.dev/skills/duckduckgo/apple-browsers/ddg-design-system"><img src="https://agentmods.dev/badge/skills/duckduckgo/apple-browsers/ddg-design-system/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/skills/duckduckgo/apple-browsers/ddg-design-system"><img src="https://agentmods.dev/badge/skills/duckduckgo/apple-browsers/ddg-design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 774 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	$0.00065	$0.00774
Opus 5.5	$0.00026	$0.00310
Sonnet 5.5	$0.00013	$0.00155
Haiku 4.5	$0.00006	$0.00077

Measured 14d ago against content hash b0eba0431ae3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ddg-design-system 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 14d 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.

.claude/skills/ddg-design-system/SKILL.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Design system (DRK)

Figma defines the design intent. The code in SharedPackages/Infrastructure/DesignResourcesKit, SharedPackages/Infrastructure/DesignResourcesKitIcons, SharedPackages/UIComponents and, on iOS, iOS/LocalPackages/DuckUI defines what is available; read it rather than assuming an API exists.

Lookup order

For every color, font, icon or piece of repeated styling, stop at the first step that fits:

A DRK semantic color or typography style, or a DRKIcons asset in the matching size.
A common component, modifier or preset in UIComponents, a button style in DuckUI (iOS), or an existing usage nearby. Look before writing your own buttons, shadows, borders, corner radii or spacing.
Nothing fits: ask the user what to do. Figma and a designer should resolve the doubt.

SingleUseColor is the fallback when no semantic color fits. When you use one, say so explicitly to the user and recommend confirming with a designer that no semantic color applies.

Do

Use semantic colors (Color(designSystemColor:), UIColor(designSystemColor:), NSColor(designSystemColor:)) and keep the screen's palette wiring and light/dark behavior.
macOS: colors must follow live theme changes. Read references/macos-theming.md before touching colors.
iOS: use DRK typography (UIFont.daxBodyRegular(), .daxTitle1() and similar) and keep Dynamic Type working; fix layouts for larger text rather than disabling it. macOS: DRK typography is iOS only, so follow the feature's existing conventions.
Prefer system components when they meet the design.

Don't

Use baseColor: initializers, hex or RGB literals, or new color assets in the apps. They bypass palettes and dark mode.
Duplicate a DRKIcons icon in app assets or swap it for a lookalike SF Symbol.
Replace intentional platform, feature or branding differences with the nearest token just to remove literals, or restyle unrelated UI during a focused change.
Add speculative abstractions. Extract shared code when a pattern actually repeats.

Read the full file on GitHub · 67 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/macos-theming.md 1.8 KB

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.

14d ago Changed · +2 lines · +5 tokens per session b0eba0431ae3
17d ago First seen · 65 lines · 60 tokens per session scan A f94a94b9f635

Subscribe to this mod's changes

ddg-design-system is a skill published in the GitHub repository duckduckgo/apple-browsers (270 stars, last pushed today), licensed Apache-2.0. It adds 65 tokens to every session and 774 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-10-20.

Design and UX browsers duckduckgo ios macos

ddg-design-system next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ddg-design-systemduckduckgo/apple-browsers	Skill	270	today	Apache-2.0	A	65	Claude Code
apple-designbillythekidz/apple-design-skill	Skill	5	2mo ago	MIT	A	55	Claude Code, Codex
dynamic-type-supportcruisediary/apple-app-review-skills	Skill	20	6mo ago	MIT	A	39	Claude Code, Codex
orientation-supportcruisediary/apple-app-review-skills	Skill	20	6mo ago	MIT	A	43	Claude Code, Codex
safe-area-compliancecruisediary/apple-app-review-skills	Skill	20	6mo ago	MIT	A	39	Claude Code, Codex
apple-hig-checklyupro/skillforge-mcp	Skill	2	2mo ago	MIT	A	15	Claude Code
apple-designbillythekidz/apple-design-skill	Skill	5	2mo ago	MIT	A	55	Claude Code, Codex

apple-browsers: Skill for Claude Code