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/browserserviceskit-integrationgit clone --depth 1 https://github.com/duckduckgo/apple-browsersWrote 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/rules/duckduckgo/apple-browsers/browserserviceskit-integration)<a href="https://agentmods.dev/rules/duckduckgo/apple-browsers/browserserviceskit-integration"><img src="https://agentmods.dev/badge/rules/duckduckgo/apple-browsers/browserserviceskit-integration.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.02328 |
| Opus 5 | $0.00000 | $0.01164 |
| Sonnet 5 | $0.00000 | $0.00466 |
| Haiku 4.5 | $0.00000 | $0.00233 |
Grade A, and why
browserserviceskit-integration 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.
How it starts
The opening of the file, as written. The whole thing — 444 lines — stays where its author put it; the contents beside it link to each section on GitHub.
BrowserServicesKit Integration Guide
Overview
BrowserServicesKit is the core shared library providing essential browser functionality to both iOS and macOS DuckDuckGo applications. It ensures consistent behavior and code reuse across platforms while maintaining privacy as the primary focus.
Core Modules and Usage
Privacy & Protection
Always use BrowserServicesKit for privacy-related functionality:
// ✅ CORRECT - Content blocking integration
import BrowserServicesKit
import ContentBlocking
final class PrivacyManager {
private let contentBlockingManager = ContentBlockingManager.shared
func enableContentBlocking(for webView: WKWebView) {
contentBlockingManager.enable(for: webView)
}
func updateBlockingRules() async {
await contentBlockingManager.updateRules()
}
}
// ✅ CORRECT - Privacy configuration
import PrivacyConfig
final class PrivacyFeatureManager {
private let privacyConfig = PrivacyConfiguration.shared
func isFeatureEnabled(_ feature: PrivacyFeature) -> Bool {
return privacyConfig.isEnabled(feature)
}
}
Data Management
Use BrowserServicesKit for all data persistence:
// ✅ CORRECT - Bookmarks management
import Bookmarks
final class BookmarkService {
private let bookmarkManager = BookmarkManager.shared
func saveBookmark(_ bookmark: Bookmark) async {
await bookmarkManager.save(bookmark)
}
func fetchBookmarks() async -> [Bookmark] {
return await bookmarkManager.fetchAll()
}
}
// ✅ CORRECT - Secure credential storage
import SecureVault
final class CredentialManager {
private let secureVault = SecureVault.shared
func storeCredential(_ credential: WebsiteCredential) async throws {
try await secureVault.store(credential)
}
func retrieveCredentials(for domain: String) async throws -> [WebsiteCredential] {
return try await secureVault.credentials(for: domain)
}
}
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 · 444 lines · 0 tokens per session scan A 95d0b9527dd1
browserserviceskit-integration is a cursor rule published in the GitHub repository duckduckgo/apple-browsers (251 stars, last pushed yesterday), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 2,328 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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