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/wangqiqi/cursor-ai-rules/rust-basics-typesgit clone --depth 1 https://github.com/wangqiqi/cursor-ai-rulesWhat 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 | $0.00419 |
| Opus 5 | $0.00000 | $0.00210 |
| Sonnet 5 | $0.00000 | $0.00084 |
| Haiku 4.5 | $0.00000 | $0.00042 |
Grade A, and why
rust-basics-types 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 3d 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.
What it actually says
Rust 类型系统 (Types)
本规则由
@rust-basics引用
错误处理
#[derive(Debug)]
pub enum Error {
Io(std::io::Error),
Validation(String),
NotFound(String),
}
impl std::error::Error for Error {}
impl From<std::io::Error> for Error { fn from(err: std::io::Error) -> Self { Error::Io(err) } }
pub type Result<T> = std::result::Result<T, Error>;
fn process_user_data(user_id: &str) -> Result<User> {
let id: u64 = user_id.parse()?;
let user = find_user_by_id(id).ok_or_else(|| Error::NotFound(format!("User {} not found", id)))?;
Ok(user)
}
泛型与特征
pub trait Repository<T> {
fn save(&self, item: &T) -> Result<()>;
fn find_by_id(&self, id: u64) -> Result<Option<T>>;
}
impl<T: Clone + Validatable> Repository<T> for InMemoryRepository<T> { ... }
异步编程
#[async_trait::async_trait]
pub trait AsyncRepository<T>: Send + Sync {
async fn save(&self, item: &T) -> Result<()>;
async fn find_by_id(&self, id: u64) -> Result<Option<T>>;
}
pub struct SharedCounter {
count: Mutex<i64>,
}
原则
- MUST 使用 Result 和 ? 操作符
- MUST 实现 std::error::Error
- MUST 用 async_trait 定义异步特征
引用: @rust-basics
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.
- 3d ago First seen · 68 lines · 0 tokens per session scan A e7d488477cdc
rust-basics-types is a cursor rule published in the GitHub repository wangqiqi/cursor-ai-rules (15 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 419 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 2026-08-30.
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