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/iolairus/borderlint/cursorgit clone --depth 1 https://github.com/iolairus/borderlintWhat 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 | $0.00334 | $0.00334 |
| Opus 5 | $0.00167 | $0.00167 |
| Sonnet 5 | $0.00067 | $0.00067 |
| Haiku 4.5 | $0.00033 | $0.00033 |
Grade A, and why
cursor 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.
What it actually says
Before adding any AI SDK import, AI endpoint reference, or model identifier to this codebase
(an openai/anthropic/langchain-style package, a provider URL, a Bedrock/HF/Ollama model
id, an OpenAI-compatible base_url, an LLM endpoint in config or .env):
- Run the border check first. With a project policy:
borderlint scan . --policy residency.json --classification <the project's data class>Otherwise inventory mode:borderlint scan . - If the addition would introduce a flow whose jurisdiction is not
local— or a provider/router that resolves tounknown— say so in the conversation BEFORE committing, naming the provider, its residency jurisdiction, its sovereignty bloc, and (if a model id is involved) its provenance bloc. Let the human decide. - If the flow is accepted, record it with an inline waiver carrying a real justification:
# borderlint: allow <reason>. Unjustified waivers are ignored; waivers cannot override a provider or model deny.
Backstop: the pre-commit hook and the CI SBOM diff gate fail any PR that adds new
non-local AI egress — this rule moves the check to where the decision is made.
Install: save as .cursor/rules/borderlint.mdc in your project.
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 · 25 lines · 334 tokens per session scan A 704c5b6ff094
cursor is a cursor rule published in the GitHub repository iolairus/borderlint (6 stars, last pushed 9d ago), licensed MIT. It adds 334 tokens to every session, about $0.0017 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
angular-20
This rule provides comprehensive best practices and coding standards for Angular development, focusing on modern TypeScript, standalone components, signals, and performance optimizations.
dev-standard
Apache Superset development standards and guidelines for Cursor IDE.
typescript
Changes to these high-fan-out internals can affect every message, delta, element, or rerun. Keep work in them minimal, and benchmark changes with representative stress-test apps.
coolify-ai-docs
Master reference to all Coolify AI documentation in .ai/ directory.
python_lib
Tips and guidelines specific to the development of the Streamlit Python library, not applicable to scripts and e2e tests.
specs
This directory contains product and tech specs for Streamlit features.