A concise set of Rust practices for code structure, error handling, unsafe blocks, data structures, command-line tools, and tests.

Use it while writing or reviewing Rust code, organizing modules, handling recoverable errors, documenting unsafe code, or defining tests and command-line behavior.

It provides a practical checklist for avoiding fragile code and keeping common Rust decisions consistent.

rust — Skill for Claude Code and Codex by heyAyushh

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 heyAyushh/stacc --skill rust

Clone the repo

git clone --depth 1 https://github.com/heyAyushh/stacc

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/heyayushh/stacc/rust/github.svg)](https://agentmods.dev/skills/heyayushh/stacc/rust)

Your own site

<a href="https://agentmods.dev/skills/heyayushh/stacc/rust"><img src="https://agentmods.dev/badge/skills/heyayushh/stacc/rust/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/heyayushh/stacc/rust"><img src="https://agentmods.dev/badge/skills/heyayushh/stacc/rust.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 967 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.

Model	Per session	Once invoked
Fable 5.1	$0.00036	$0.00967
Opus 5	$0.00018	$0.00483
Sonnet 5	$0.00007	$0.00193
Haiku 4.5	$0.00004	$0.00097

Measured 9d ago against content hash 564e3a062d64, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

rust 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 9d 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.

configs/stacks/rust/SKILL.md · 97 lines

How it starts

The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Rust Best Practices

Quick Start

Apply these rules by default when touching Rust:

Organize code by feature/module, not by file type
Keep structs small and focused; split large data into composable types
Prefer Result<T, E> for recoverable errors, avoid panic!
Document every unsafe block with a // SAFETY: rationale
Default to Vec/HashMap; pre-allocate when size is known
For CLIs, expose non-interactive flags, stdin/file input, actionable errors, and example-rich help

Workflow (use this order)

Clarify scope: new module, refactor, or review.
Organize by feature/module; keep type + impls together.
Ensure error handling uses Result (avoid panic! except invariants).
Document unsafe blocks with // SAFETY: and minimal scope.
Choose data structures intentionally and pre-allocate when size is known.
For binaries, define the automation contract: flags, stdin, output format, exit codes, and dry-run behavior.
Add or update tests (unit tests + rustdoc examples for public APIs; CLI help/error tests for binaries).

Review Checklist

Module layout is feature-driven and cohesive.
Result used for recoverable errors; panic! justified.
All unsafe blocks have explicit // SAFETY: rationale.
No oversized structs; data is composed cleanly.
Collections pre-allocated when size is known.
CLI surfaces can run unattended and explain retry commands on usage errors.
Tests and doc examples cover edge cases.

Sub-Skills

Load these for focused guidance on specific topics:

Skill	When to Use
`ownership`	Ownership/borrow errors (E0382, E0597), lifetime design
`error-handling`	Result vs Option, anyhow vs thiserror, custom error types
`concurrency`	Send/Sync errors, threads vs async, shared state design
`zero-cost-abstractions`	Generics vs dyn Trait, object safety, dispatch choice
`type-driven-design`	Newtypes, type state, PhantomData, invalid states
`performance`	Profiling, allocation reduction, cache, parallelism
`agent-friendly-cli`	Rust binaries, clap command trees, diagnostics/codegen tools
`anti-patterns`	Code review, clone/unwrap overuse, idiomatic rewrites
`coding-guidelines`	Naming, style, modern crate recommendations

Read the full file on GitHub · 97 lines

Files

What ships with it

10 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.

9d ago First seen · 97 lines · 36 tokens per session scan A 564e3a062d64

Subscribe to this mod's changes

rust is a skill published in the GitHub repository heyAyushh/stacc (3 stars, last pushed 2mo ago), licensed MIT. It adds 36 tokens to every session and 967 once invoked, about $0.0002 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 2026-09-03.

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