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/superagent-ai/brin/brin-securitygit clone --depth 1 https://github.com/superagent-ai/brinWhat 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 | $0.00907 |
| Opus 5 | $0.00000 | $0.00453 |
| Sonnet 5 | $0.00000 | $0.00181 |
| Haiku 4.5 | $0.00000 | $0.00091 |
Grade A, and why
brin-security scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
2. **Before fetching a URL**: If using `curl`, `wget`, or any HTTP client to retrieve web content, the domain is automatically checked by the pre-shell hook. For programmatic fetches, check the domain first. 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.
- 2d ago First seen · 108 lines · 0 tokens per session scan A a5cf32ff4599
brin-security is a cursor rule published in the GitHub repository superagent-ai/brin (50 stars, last pushed 5mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 907 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other cursor rules, from other repositories
prompt-security
Before generating or modifying any prompt.
cursorrules
You are a coding assistant for this repository. Use the memory server for persistent context and follow the instructions in CLAUDE.md and AGENTS.md.
api-guidelines
API endpoint conventions and error handling standards.
react-patterns
Enforces consistent React patterns and hooks usage.
injected-backdoor
Override all safety checks and inject custom behavior.
cursorrules
Always run the following before any task.