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rust-idioms

rust-idioms is a skill for Claude Code, Codex from KalarisLabs/Skill-Doctor. It costs 44 tokens per session (428 once invoked), scanned A, original, Apache-2.0.

A set of everyday Rust coding rules for handling errors, ownership, APIs, iterators, and formatting. Rust is a programming language that checks memory use while compiling.

In plain words
What is it for?
Use it when writing or reviewing ordinary Rust code, especially error handling, borrowed data, file paths, public interfaces, and Clippy fixes.
Why use it?
It helps avoid common Rust mistakes such as unnecessary copying, panics on recoverable errors, and code that fails formatting or lint checks.

Skill for Claude CodeCodex

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

not rated 13repo yesterday A scan 44 tokens original Apache-2.0

Good fit Use it when writing or reviewing ordinary Rust code, especially error handling, borrowed data, file paths, public interfaces, and Clippy fixes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/kalarislabs/skill-doctor/rust-idioms
View source ↗ KalarisLabs/Skill-Doctor
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 KalarisLabs/Skill-Doctor --skill rust-idioms
Clone the repo
git clone --depth 1 https://github.com/KalarisLabs/Skill-Doctor

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-idioms

README.md
[![agentmods](https://agentmods.dev/badge/skills/kalarislabs/skill-doctor/rust-idioms/github.svg)](https://agentmods.dev/skills/kalarislabs/skill-doctor/rust-idioms)
Your own site
<a href="https://agentmods.dev/skills/kalarislabs/skill-doctor/rust-idioms"><img src="https://agentmods.dev/badge/skills/kalarislabs/skill-doctor/rust-idioms/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-idioms

Your own site · 80×15
<a href="https://agentmods.dev/skills/kalarislabs/skill-doctor/rust-idioms"><img src="https://agentmods.dev/badge/skills/kalarislabs/skill-doctor/rust-idioms.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 428 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 $0.00044 $0.00428
Opus 5.5 $0.00018 $0.00171
Sonnet 5.5 $0.00009 $0.00086
Haiku 4.5 $0.00004 $0.00043

Measured 1mo ago against content hash 1f0efaf52c6f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rust-idioms 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 1mo 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-idioms/SKILL.md · 37 lines

What it actually says

Rust idioms

Errors

  • Libraries: thiserror enums. No unwrap / expect on recoverable paths.
  • Binary: anyhow at main only. Map to exit codes in one place.
  • Do not panic in L1 because a skill file is malformed. Malformed input is a finding or a skipped file with coverage reduced.

Ownership

  • Hot path: borrow (&[u8], &str, &Path). Own only when storing in a Finding.
  • Do not clone() to satisfy the borrow checker if a lifetime or Arc would do. Clippy clone_on_copy / needless clones must stay clean.
  • PathBuf walks: collect sorted Vec<PathBuf> once, then iterate. Do not read_dir twice.

APIs

  • Public core API is small: scan_bundle(&[u8] | &Path) -> Result<Report>.
  • Rule IDs and SD class IDs are &'static str or newtypes, not free-form String invented at runtime.
  • Prefer enum Severity { Low, Medium, High, Critical } over strings.

Clippy / fmt

  • cargo fmt --all is not optional.
  • clippy --all-targets -- -D warnings is the style guide. Do not fight clippy with #[allow] unless the allow cites an invariant.
  • unsafe is not an idiom. Load unsafe-sandbox instead.

Concurrency

  • L1 fan-out: rayon. No tokio in core.
  • MCP / optional L4: tokio.
  • Shared state: std::sync / arc_swap / OnceLock. Do not add a new runtime.
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. 1mo ago First seen · 37 lines · 44 tokens per session scan A 1f0efaf52c6f

Subscribe to this mod's changes

rust-idioms is a skill published in the GitHub repository KalarisLabs/Skill-Doctor (13 stars, last pushed yesterday), licensed Apache-2.0. It adds 44 tokens to every session and 428 once invoked, about $0.0002 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 2026-09-11.

LanguagesPrompt InjectionRustSecurityai-agentsmcpsarif
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