architecture

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.

agentmods

npx agentmods add rules/duckduckgo/apple-browsers/architecture

Clone the repo

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

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/duckduckgo/apple-browsers/architecture.svg)](https://agentmods.dev/rules/duckduckgo/apple-browsers/architecture)

Your own site

<a href="https://agentmods.dev/rules/duckduckgo/apple-browsers/architecture"><img src="https://agentmods.dev/badge/rules/duckduckgo/apple-browsers/architecture.svg" alt="Measured on agentmods" height="20"></a>

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

When invoked 494 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00000	$0.00494
Opus 5	$0.00000	$0.00247
Sonnet 5	$0.00000	$0.00099
Haiku 4.5	$0.00000	$0.00049

Measured 2d ago against content hash 55d7a330ab07, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

architecture 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 2d 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/architecture.mdc · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DuckDuckGo Browser Architecture Guidelines

Overall Architecture

This is a multi-platform monorepo supporting iOS and macOS browsers
Shared code lives in SharedPackages/ directory
Platform-specific code in iOS/ and macOS/ directories
Follow modular architecture with clear separation of concerns

Architecture Patterns

MVVM for SwiftUI Views

Use MVVM pattern for all SwiftUI views
ViewModels should conform to ObservableObject
Use @Published properties for reactive updates
Keep ViewModels testable and free from UI concerns

Example:

class FeatureViewModel: ObservableObject {
    @Published var state: FeatureState = .idle
    private let service: FeatureServiceProtocol
    
    init(service: FeatureServiceProtocol) {
        self.service = service
    }
}

Coordinator Pattern

Use coordinators for navigation and flow control
Main app flow managed by MainCoordinator
Create feature-specific coordinators as needed
Coordinators handle navigation logic, not views

Dependency Injection

Use constructor injection for dependencies
Define protocols for all dependencies
Use AppDependencyProvider for shared dependencies
Keep dependencies explicit and testable

Code Organization

Feature-Based Structure

Organize code by features, not layers
Each feature should have its own folder containing:
- Views (SwiftUI/UIKit)
- ViewModels
- Services
- Models
- Tests

File Naming Conventions

ViewModels: FeatureNameViewModel.swift
Views: FeatureNameView.swift (SwiftUI) or FeatureNameViewController.swift (UIKit)
Services: FeatureNameService.swift
Protocols: FeatureNameProtocol.swift or embed in main file

Extension Organization

Split large classes into focused extensions
Name extensions descriptively: MainViewController+Email.swift
Group related functionality in extensions

Privacy-First Design

All features must consider privacy implications
Use secure storage for sensitive data
Implement proper data clearing mechanisms
Follow fireproofing patterns where applicable

Read the full file on GitHub · 77 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.

2d ago First seen · 77 lines · 0 tokens per session scan A 55d7a330ab07

Subscribe to this mod's changes

architecture is a cursor rule published in the GitHub repository duckduckgo/apple-browsers (252 stars, last pushed 2d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 494 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 2026-09-01.

browsers duckduckgo ios macos