agentmods.dev

cluster-cli: Skill for Claude Code

.agents/skills/rust-best-practices/SKILL.md

rust-best-practices is a skill for Claude Code from sharat/cluster-cli. It costs 91 tokens per session (1,072 once invoked), scanned A, a copy of rust-best-practices, MIT.

A guide to idiomatic Rust code based on Apollo GraphQL's best-practices handbook. It covers ownership choices, error handling, performance, testing, generics, and documentation.

In plain words
What is it for?
It is for writing, reviewing, and refactoring Rust code, including choosing between borrowing and cloning, using Result errors, applying lints, and designing tests.
Why use it?
It helps developers make consistent Rust design choices and avoid problems such as unnecessary cloning, unclear errors, and unsafe state patterns.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: installed under .agents/ (shared by several agents).

This is sharat/cluster-cli's own configuration. It tells Claude Code how to work on cluster-cli itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cluster-cli configures →

not rated 9repo 16d ago A scan 91 tokens copy · 92% MIT
View source ↗ sharat/cluster-cli sharat.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to sharat/cluster-cli. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/sharat/cluster-cli/main/.agents/skills/rust-best-practices/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/sharat/cluster-cli

Made for: Claude Code.

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-best-practices

README.md
[![agentmods](https://agentmods.dev/badge/skills/sharat/cluster-cli/rust-best-practices/github.svg)](https://agentmods.dev/skills/sharat/cluster-cli/rust-best-practices)
Your own site
<a href="https://agentmods.dev/skills/sharat/cluster-cli/rust-best-practices"><img src="https://agentmods.dev/badge/skills/sharat/cluster-cli/rust-best-practices/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-best-practices

Your own site · 80×15
<a href="https://agentmods.dev/skills/sharat/cluster-cli/rust-best-practices"><img src="https://agentmods.dev/badge/skills/sharat/cluster-cli/rust-best-practices.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,072 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 92% copy Near-identical to another mod 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 $0.00091 $0.01072
Opus 5.5 $0.00036 $0.00429
Sonnet 5.5 $0.00018 $0.00214
Haiku 4.5 $0.00009 $0.00107

Measured yesterday against content hash b1651a95a2c3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rust-best-practices 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 yesterday.

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.

Origin

This is a copy

92% identical to rust-best-practices — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/rust-best-practices/SKILL.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Rust Best Practices

Apply these guidelines when writing or reviewing Rust code. Based on Apollo GraphQL's Rust Best Practices Handbook.

Best Practices Reference

Before reviewing, familiarize yourself with Apollo's Rust best practices. Read ALL relevant chapters in the same turn in parallel. Reference these files when providing feedback:

Quick Reference

Borrowing & Ownership

  • Prefer &T over .clone() unless ownership transfer is required
  • Use &str over String, &[T] over Vec<T> in function parameters
  • Small Copy types (≤24 bytes) can be passed by value
  • Use Cow<'_, T> when ownership is ambiguous

Error Handling

  • Return Result<T, E> for fallible operations; avoid panic! in production
  • Never use unwrap()/expect() outside tests
  • Use thiserror for library errors, anyhow for binaries only
  • Prefer ? operator over match chains for error propagation

Read the full file on GitHub · 95 lines

Files

What ships with it

9 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. yesterday First seen · 95 lines · 91 tokens per session scan A b1651a95a2c3

Subscribe to this mod's changes

rust-best-practices is a skill published in the GitHub repository sharat/cluster-cli (9 stars, last pushed 16d ago), licensed MIT. It adds 91 tokens to every session and 1,072 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 92% identical to rust-best-practices, differing in 4 lines, and is treated as a copy.

Code reviewLanguagesRust
Related

rust-best-practices compared with skills from other repositories

rust-best-practices next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
rust-best-practicessharat/cluster-cliSkill916d agoMITA91Claude Code
cargo-fallowfallow-rs/fallow-skillsSkill137yesterdayMITA104Claude Code, Codex
architecture-auditorg2AI/ORG2Skill2.6k4d agoAGPL-3.0A70Claude Code, Codex
architectural_reviewEmilLindfors/a2a-rsSkill926d agoMITA82Claude Code, Codex
hexagonal_reviewEmilLindfors/a2a-rsSkill926d agoMITA65Claude Code, Codex
writing-rustalexei-led/cc-thingzSkill3813d agoMITA73Claude Code, Codex
rust-reviewliuyanghejerry/ClausuraSkill2051mo agoMITA25Claude Code, Codex