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 agentmods add rules/duckduckgo/apple-browsers/project-structuregit clone --depth 1 https://github.com/duckduckgo/apple-browsersWhat 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 | $0.02544 |
| Opus 5 | $0.00000 | $0.01272 |
| Sonnet 5 | $0.00000 | $0.00509 |
| Haiku 4.5 | $0.00000 | $0.00254 |
Grade A, and why
project-structure 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 yesterday.
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 — 349 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Project Structure & Organization
Workspace Structure
Root Level
DuckDuckGo.xcworkspace/ # Main workspace (ALWAYS open this)
├── iOS/ # iOS app target
├── macOS/ # macOS app target
├── SharedPackages/ # Cross-platform Swift packages
├── fastlane/ # CI/CD automation
└── README.md # Main project documentation
iOS App Structure
iOS/
├── DuckDuckGo/ # Main iOS app
│ ├── AppDelegate.swift # App lifecycle
│ ├── MainViewController.swift # Primary browser interface
│ ├── BrowserTab.swift # Tab state and WebKit integration
│ ├── AIChat/ # AI chat integration
│ ├── AppLifecycle/ # App lifecycle management
│ ├── Autofill/ # Form autofill features
│ ├── Bookmarks/ # Bookmark management
│ ├── BrowsingMenu/ # Browser menu UI
│ ├── Configuration/ # App configuration
│ ├── DataImport/ # Data import utilities
│ ├── HealthKitReporting/ # Health data reporting
│ ├── MainWindow/ # Main window controllers
│ ├── Subscription/ # Premium features
│ ├── SyncPrompt/ # Sync feature prompts
│ ├── TabSwitcher/ # Tab switching UI
│ └── WebView/ # Web view management
├── Core/ # iOS-specific shared utilities
├── AutofillCredentialProvider/ # Password autofill extension
├── PacketTunnelProvider/ # VPN network extension
├── OpenAction/ # Share sheet integration
├── Widgets/ # Home screen widgets
└── Configuration/ # Build configurations
macOS App Structure
macOS/
├── DuckDuckGo/ # Main macOS app
│ ├── AppDelegate.swift # App lifecycle
│ ├── MainWindow.swift # Primary window controller
│ ├── BrowserTabViewController.swift # Web view management
│ ├── AIChat/ # AI chat integration
│ ├── Autofill/ # Form autofill features
│ ├── Bookmarks/ # Bookmark management UI
│ ├── Downloads/ # Download handling
│ ├── NavigationBar/ # URL bar and navigation
│ ├── NetworkProtection/ # VPN integration
│ ├── Preferences/ # Settings and preferences
│ ├── Subscription/ # Premium features
│ ├── SyncPrompt/ # Sync feature prompts
│ ├── TabBar/ # Tab management UI
│ └── WebView/ # Web view management
├── DuckDuckGoVPN/ # Standalone VPN app
├── NetworkProtectionSystemExtension/ # System-level VPN
├── DuckDuckGoDBPBackgroundAgent/ # Data Broker Protection
├── DuckDuckGoNotifications/ # System notifications
└── Configuration/ # Build configurations
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.
- yesterday First seen · 349 lines · 0 tokens per session scan A 86895bb11b9e
project-structure is a cursor rule published in the GitHub repository duckduckgo/apple-browsers (252 stars, last pushed yesterday), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 2,544 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.
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