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/wklm/beacio-sdk/cursorrulesgit clone --depth 1 https://github.com/wklm/beacio-sdkWhat 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 | $0.00630 | $0.00630 |
| Opus 5 | $0.00315 | $0.00315 |
| Sonnet 5 | $0.00126 | $0.00126 |
| Haiku 4.5 | $0.00063 | $0.00063 |
Grade A, and why
cursorrules 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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 · 53 lines · 630 tokens per session scan A bc20568e5314
cursorrules is a cursor rule published in the GitHub repository wklm/beacio-sdk (6 stars, last pushed 6d ago), with no licence file. It adds 630 tokens to every session, about $0.0032 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 2026-08-31.
Other cursor rules, from other repositories
abn-experiment-framework
The DuckDuckGo browser includes a comprehensive A/B/N experiment framework that enables data-driven feature testing across iOS and macOS platforms. This framework allows you to safely experiment with new ideas while maintaining control groups and measuring impact.
browserserviceskit-integration
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.
general
This is the DuckDuckGo browser for iOS and macOS, built with privacy-first principles, modern Swift patterns, and cross-platform architecture.
testing
This guide covers testing practices and patterns for the DuckDuckGo browser on iOS and macOS platforms.
webkit-browser
Cursor rule "webkit-browser" from duckduckgo/apple-browsers, covering webkit & browser development guidelines, webview configuration, basic webview setup, user scripts management and tab management.
network-quality-test-config
The NetworkQualityMonitor uses carefully tuned parameters to balance speed and accuracy for browser performance testing.