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Agent skill

Rust Expert

by RightNow-AI in RightNow-AI/openfang

Rust programming expert for ownership, lifetimes, async/await, traits, and unsafe code

Apache-2.0Auto-check passedDevelopment

Install Rust Expert

skills CLI
$ npx skills add RightNow-AI/openfang --skill rust-expert -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install RightNow-AI/openfang rust-expert --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/openfang-skills/bundled/rust-expert .claude/skills/rust-expert && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
rust-expert
GitHub stars
18k
Token cost
~794 tokens
SKILL.md length
426 words
Files
1
Skills in repo
68
Repo updated
First seen
Licence
Apache-2.0

At a glance

Rust programming expert for ownership, lifetimes, async/await, traits, and unsafe code

  • Tasks that involve Async programming
  • SKILL.md covers Key Principles, Techniques, Common Patterns and Pitfalls to Avoid
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Rust Expert is an agent skill from RightNow-AI/openfang. Rust programming expert for ownership, lifetimes, async/await, traits, and unsafe code

Its SKILL.md is about 790 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Async programming. It works with Rust. The repository describes itself as: Open-source Agent Operating System. The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Async programming

Example prompts

  • “/rust-expert”

What it can do on your machine

Read from SKILL.md and the folder at commit acf2587. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Rust Expert loads about 794 tokens when it runs. Until then it costs about 25 tokens; SKILL.md has 426 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~25
When it runs · the whole SKILL.md, loaded when a task matches
~794

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from RightNow-AI/openfang at commit acf2587, republished under its Apache-2.0 licence (© RightNow-AI). 426 words, ~794 tokens.

Download SKILL.mdSave it as .claude/skills/rust-expert/SKILL.md (or your agent's skills folder).
name
rust-expert
description
Rust programming expert for ownership, lifetimes, async/await, traits, and unsafe code

Rust Programming Expertise

You are an expert Rust developer with deep understanding of the ownership system, lifetime semantics, async runtimes, trait-based abstraction, and low-level systems programming. You write code that is safe, performant, and idiomatic. You leverage the type system to encode invariants at compile time and reserve unsafe code only for situations where it is truly necessary and well-documented.

Key Principles

  • Prefer owned types at API boundaries and borrows within function bodies to keep lifetimes simple
  • Use the type system to make invalid states unrepresentable; enums over boolean flags, newtypes over raw primitives
  • Handle errors explicitly with Result; use thiserror for library errors and anyhow for application-level error propagation
  • Write unsafe code only when the safe abstraction cannot express the operation, and document every safety invariant
  • Design traits with minimal required methods and provide default implementations where possible

Techniques

  • Apply lifetime elision rules: single input reference, the output borrows from it; &self methods, the output borrows from self
  • Use tokio::spawn for concurrent tasks, tokio::select! for racing futures, and tokio::sync::mpsc for message passing between tasks
  • Prefer impl Trait in argument position for static dispatch and dyn Trait in return position only when dynamic dispatch is required
  • Structure error types with #[derive(thiserror::Error)] and #[error("...")] for automatic Display implementation
  • Apply Pin<Box<dyn Future>> when storing futures in structs; understand that Pin guarantees the future will not be moved after polling begins
  • Use macro_rules! for repetitive code generation; prefer declarative macros over procedural macros unless AST manipulation is needed
Show full SKILL.md (181 more words)Show less

Common Patterns

  • Builder Pattern: Create a FooBuilder with fn field(mut self, val: T) -> Self chainable setters and a fn build(self) -> Result<Foo> finalizer that validates invariants
  • Newtype Wrapper: Wrap String as struct UserId(String) to prevent accidental mixing of semantically different string types at the type level
  • RAII Guard: Implement Drop on a guard struct to ensure cleanup (lock release, file close, span exit) happens even on early return or panic
  • Typestate Pattern: Encode state machine transitions in the type system so that calling methods in the wrong order is a compile-time error

Pitfalls to Avoid

  • Do not clone to satisfy the borrow checker without first considering whether a reference or lifetime annotation would work; cloning hides the real ownership issue
  • Do not use unwrap() in library code; propagate errors with ? and let the caller decide how to handle failure
  • Do not hold a MutexGuard across an .await point; this can cause deadlocks since the guard is not Send across task suspension
  • Do not add unsafe blocks without a // SAFETY: comment explaining why the invariants are upheld; undocumented unsafe is a maintenance hazard

© RightNow-AI, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in crates/openfang-skills/bundled/rust-expert of RightNow-AI/openfang.

Open the folder on GitHubat commit acf2587

Compare with similar skills

Rust Expert next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Rust Expert compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Rust Expert this skillRightNow-AI/openfang18k—~794Automated safety check: PassApache-2.0
Rust Async Patternsdiodeme/Gold-Band14310 repos~3.1kAutomated safety check: PassAGPL-3.0
Rust Engineerfarm-fe/farm5.6k1 repos~1.5kAutomated safety check: PassMIT
Windmill Rust Backend Patternswindmill-labs/windmill18k—~869Automated safety check: PassCustom licence
Rust Prodavila7/claude-code-templates32k7 repos~1.9kAutomated safety check: PassMIT
Rust Debuggingmohitmishra786/low-level-dev-skills253—~1.6kAutomated safety check: PassMIT

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Works with

Categories

Questions about Rust Expert

What does Rust Expert do?

Rust programming expert for ownership, lifetimes, async/await, traits, and unsafe code. Rust Expert is an agent skill from RightNow-AI/openfang.

When should I use Rust Expert?

Rust Expert fits situations like: tasks that involve Async programming.

How do I install Rust Expert in Claude Code?

Run `npx skills add RightNow-AI/openfang --skill rust-expert -a claude-code`. Or copy the skill folder (crates/openfang-skills/bundled/rust-expert in RightNow-AI/openfang) into .claude/skills/rust-expert in your project. Claude Code loads it when a task matches its description.

How do I install Rust Expert in Codex?

Run `npx skills add RightNow-AI/openfang --skill rust-expert -a codex`. Or copy the skill folder (crates/openfang-skills/bundled/rust-expert in RightNow-AI/openfang) into .agents/skills/rust-expert in your project. Codex loads it when a task matches its description.

Can I use Rust Expert in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add RightNow-AI/openfang --skill rust-expert -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/rust-expert, .gemini/skills/rust-expert, .github/skills/rust-expert and .opencode/skills/rust-expert in your project.

What does Rust Expert need to run?

SKILL.md names no scripts, command-line tools or credentials: Rust Expert is instructions for the agent only.

Does Rust Expert access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Rust Expert safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Rust Expert use?

Rust Expert is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Rust Expert use?

About 794 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Rust Expert?

Skills that share tags, products or a category with Rust Expert: Rust Async Patterns (diodeme/Gold-Band, 143 stars), Rust Engineer (farm-fe/farm, 5.6k stars), Windmill Rust Backend Patterns (windmill-labs/windmill, 18k stars) and Rust Pro (davila7/claude-code-templates, 32k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Rust Expert?

RightNow-AI (a GitHub organization) maintains it in RightNow-AI/openfang, which has 18,213 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on July 2, 2026.

Source: RightNow-AI/openfang on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.