MCPInstall

rust-systems

by rohitg00Backend & APIs

Rust systems programming patterns including ownership, traits, async runtime, error handling, and unsafe guidelines

Installs
185
Last 24h
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Security
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/rohitg00/awesome-claude-code-toolkit --skill rust-systems
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads rust-systems automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Rust Systems

Ownership and Borrowing

fn process_data(data: &[u8]) -> Vec<u8> {
    data.iter().map(|b| b.wrapping_add(1)).collect()
}

fn modify_in_place(data: &mut Vec<u8>) {
    data.retain(|b| *b != 0);
    data.sort_unstable();
}

fn take_ownership(data: Vec<u8>) -> Vec<u8> {
    let mut result = data;
    result.push(0xFF);
    result
}

fn main() {
    let data = vec![1, 2, 3, 0, 4];
    let processed = process_data(&data);     // borrow: data still usable
    let mut owned = take_ownership(data);     // move: data no longer usable
    modify_in_place(&mut owned);              // mutable borrow
}

Prefer borrowing (&T, &mut T) over ownership transfer. Use Clone only when necessary.

Error Handling

use thiserror::Error;

#[derive(Error, Debug)]
pub enum AppError {
    #[error("database error: {0}")]
    Database(#[from] sqlx::Error),

    #[error("not found: {resource} with id {id}")]
    NotFound { resource: &'static str, id: String },

    #[error("validation failed: {0}")]
    Validation(String),
}

type Result<T> = std::result::Result<T, AppError>;

async fn get_user(pool: &PgPool, id: &str) -> Result<User> {
    sqlx::query_as::<_, User>("SELECT * FROM users WHERE id = $1")
        .bind(id)
        .fetch_optional(pool)
        .await?
        .ok_or_else(|| AppError::NotFound {
            resource: "User",
            id: id.to_string(),
        })
}

Use thiserror for library errors, anyhow for application-level errors. Avoid .unwrap() in production code.

Traits and Generics

trait Repository {
    type Item;
    type Error;

    async fn find_by_id(&self, id: &str) -> std::result::Result<Option<Self::Item>, Self::Error>;
    async fn save(&self, item: &Self::Item) -> std::result::Result<(), Self::Error>;
}

struct PgUserRepo {
    pool: PgPool,
}

impl Repository for PgUserRepo {
    type Item = User;
    type Error = AppError;

    async fn find_by_id(&self, id: &str) -> Result<Option<User>> {
        let user = sqlx::query_as::<_, User>("SELECT * FROM users WHERE id = $1")
            .bind(id)
            .fetch_optional(&self.pool)
            .await?;
        Ok(user)
    }

    async fn save(&self, user: &User) -> Result<()> {
        sqlx::query("INSERT INTO users (id, name, email) VALUES ($1, $2, $3)")
            .bind(&user.id)
            .bind(&user.name)
            .bind(&user.email)
            .execute(&self.pool)
            .await?;
        Ok(())
    }
}

Async Patterns

use tokio::sync::Semaphore;
use futures::stream::{self, StreamExt};

async fn fetch_all(urls: Vec<String>, max_concurrent: usize) -> Vec<Result<String>> {
    let semaphore = Arc::new(Semaphore::new(max_concurrent));

    stream::iter(urls)
        .map(|url| {
            let sem = semaphore.clone();
            async move {
                let _permit = sem.acquire().await.unwrap();
                reqwest::get(&url).await?.text().await.map_err(Into::into)
            }
        })
        .buffer_unordered(max_concurrent)
        .collect()
        .await
}

async fn graceful_shutdown(handle: tokio::runtime::Handle) {
    let ctrl_c = tokio::signal::ctrl_c();
    ctrl_c.await.expect("Failed to listen for Ctrl+C");
    handle.shutdown_timeout(std::time::Duration::from_secs(30));
}

Builder Pattern

pub struct ServerConfig {
    host: String,
    port: u16,
    workers: usize,
    tls: bool,
}

pub struct ServerConfigBuilder {
    host: String,
    port: u16,
    workers: usize,
    tls: bool,
}

impl ServerConfigBuilder {
    pub fn new() -> Self {
        Self { host: "0.0.0.0".into(), port: 8080, workers: 4, tls: false }
    }

    pub fn host(mut self, host: impl Into<String>) -> Self { self.host = host.into(); self }
    pub fn port(mut self, port: u16) -> Self { self.port = port; self }
    pub fn workers(mut self, n: usize) -> Self { self.workers = n; self }
    pub fn tls(mut self, enabled: bool) -> Self { self.tls = enabled; self }

    pub fn build(self) -> ServerConfig {
        ServerConfig { host: self.host, port: self.port, workers: self.workers, tls: self.tls }
    }
}

Anti-Patterns

  • Using .unwrap() or .expect() in library code
  • Cloning data unnecessarily instead of borrowing
  • Holding a MutexGuard across .await points (causes deadlocks)
  • Using Arc<Mutex<Vec<T>>> when a channel would be more appropriate
  • Writing unsafe without documenting invariants
  • Not using #[must_use] on Result-returning functions

Checklist

  • Error types defined with thiserror and ? operator used for propagation
  • No .unwrap() in production paths
  • Ownership model minimizes cloning
  • Async code uses bounded concurrency (semaphores or buffer_unordered)
  • Traits used for abstraction and testability
  • unsafe blocks have documented safety invariants
  • Builder pattern used for complex configuration structs
  • Clippy lints enabled and warnings addressed

FAQ

What does the rust-systems skill do?

Rust systems programming patterns including ownership, traits, async runtime, error handling, and unsafe guidelines

How do I install rust-systems?

Run npx skills add https://github.com/rohitg00/awesome-claude-code-toolkit --skill rust-systems in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/rust-systems/ (personal) or .claude/skills/rust-systems/ (project).

Which AI agents can use rust-systems?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is rust-systems safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains rust-systems?

It is published by rohitg00 in rohitg00/awesome-claude-code-toolkit. It has 185 recorded installs.

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