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/privacy-securitygit 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/privacy-security)<a href="https://agentmods.dev/rules/duckduckgo/apple-browsers/privacy-security"><img src="https://agentmods.dev/badge/rules/duckduckgo/apple-browsers/privacy-security.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 | $0.00510 | $0.00510 |
| Opus 5 | $0.00255 | $0.00255 |
| Sonnet 5 | $0.00102 | $0.00102 |
| Haiku 4.5 | $0.00051 | $0.00051 |
Grade A, and why
privacy-security 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.
How it starts
The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Privacy & Security Guidelines
Core Principles
Privacy by Design
- Never collect or transmit user data without explicit consent
- All features must have privacy implications documented
- Default to the most private option
- Implement data minimization - only collect what's absolutely necessary
Secure Storage
Example: See secure-storage.swift
Data Handling
User Data Classification
-
Sensitive Data: Passwords, credentials, personal information
- Must use Keychain or encrypted storage
- Never log or transmit in plain text
- Clear on app logout/uninstall
-
Private Data: Browsing history, bookmarks, settings
- Store locally only
- Implement proper data clearing
- Respect fireproofing settings
-
Anonymous Data: Crash reports, usage statistics
- Only collect with user consent
- Strip all identifying information
- Use differential privacy where applicable
Network Security
Example: See network-security.swift
Content Blocking
Tracker Protection
Example: See tracker-protection.swift
Cookie Management
Example: See cookie-management.swift
Authentication & Authorization
Biometric Authentication
Example: See biometric-authentication.swift
Credential Management
Example: See credential-management.swift
Error Handling
Secure Error Messages
Example: See secure-error-messages.swift
Code Security
Input Validation
Example: See input-validation.swift
Secure Defaults
Example: See secure-defaults.swift
Testing Security
Security Test Cases
Example: See security-test-cases.swift
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 · 84 lines · 510 tokens per session scan A 5698b5df06ed
privacy-security is a cursor rule published in the GitHub repository duckduckgo/apple-browsers (252 stars, last pushed 2d ago), licensed Apache-2.0. It adds 510 tokens to every session, about $0.0026 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 2026-09-01.
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