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rust-systems

rust-systems is a skill for Claude Code, Codex from FutureJJ/claude-skills. It costs 64 tokens per session (290 once invoked), scanned A, original, MIT.

Guidance for Rust systems programming, including memory ownership, asynchronous code, traits, low-level interfaces, and error handling.

In plain words
What is it for?
Resolving ownership and lifetime errors, designing traits and enums, writing async Rust, handling errors, working with unsafe code or foreign-function interfaces, and using pattern matching.
Why use it?
It helps write Rust that satisfies the borrow checker while remaining safe, efficient, and maintainable.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 3repo 8mo ago A scan 64 tokens original MIT

Good fit Resolving ownership and lifetime errors, designing traits and enums, writing async Rust, handling errors, working with unsafe code or foreign-function interfaces, and using pattern matching.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/futurejj/claude-skills/rust-systems
View source ↗ FutureJJ/claude-skills
Install

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.

Any agent
npx skills add FutureJJ/claude-skills --skill rust-systems
Clone the repo
git clone --depth 1 https://github.com/FutureJJ/claude-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for rust-systems

README.md
[![agentmods](https://agentmods.dev/badge/skills/futurejj/claude-skills/rust-systems/github.svg)](https://agentmods.dev/skills/futurejj/claude-skills/rust-systems)
Your own site
<a href="https://agentmods.dev/skills/futurejj/claude-skills/rust-systems"><img src="https://agentmods.dev/badge/skills/futurejj/claude-skills/rust-systems/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for rust-systems

Your own site · 80×15
<a href="https://agentmods.dev/skills/futurejj/claude-skills/rust-systems"><img src="https://agentmods.dev/badge/skills/futurejj/claude-skills/rust-systems.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 290 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00064 $0.00290
Opus 5.5 $0.00026 $0.00116
Sonnet 5.5 $0.00013 $0.00058
Haiku 4.5 $0.00006 $0.00029

Measured 2mo ago against content hash 9978371fff23, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rust-systems 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 2mo 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.

skills/rust-systems/SKILL.md · 30 lines

What it actually says

Rust Systems Engineer

You are a Rust expert who helps developers write safe, performant, and idiomatic Rust.

Core Principles

  • Ownership is your friend. The borrow checker prevents data races and use-after-free.
  • Enums for state. Rust enums with data replace inheritance hierarchies.
  • Error handling with Result. Use thiserror for libraries, anyhow for applications.
  • Zero-cost abstractions. Iterators, generics, traits compile to efficient machine code.

Anti-Patterns

  • .clone() everywhere — restructure ownership instead
  • .unwrap() in production — use ? or explicit handling
  • Box<dyn Trait> when generics work — dynamic dispatch has cost
  • Premature unsafe — most problems have safe solutions

Reference Guide

Topic Reference Load When
Ownership & borrowing references/ownership.md Borrow checker errors, lifetimes
Async Rust references/async-rust.md Tokio, async traits, pinning
Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

  1. 2mo ago First seen · 30 lines · 64 tokens per session scan A 9978371fff23

Subscribe to this mod's changes

rust-systems is a skill published in the GitHub repository FutureJJ/claude-skills (3 stars, last pushed 8mo ago), licensed MIT. It adds 64 tokens to every session and 290 once invoked, about $0.0003 per session on Opus 5.5. 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.

LanguagesRustai-skillsclaudeclaude-aiclaude-skills
Related

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