Rust Best Practices

What it does

When your agent uses it

• Writing new Rust code
• Refactoring existing Rust code
• Deciding between borrowing vs cloning
• Ownership patterns

Example prompts

• “/rust-best-practices”

Requirements

• Compatibility (from SKILL.md): Rust 1.70+, Cargo
• Pre-approved tools (allowed-tools): Bash(cargo:*), Bash(rustc:*), Bash(rustfmt:*), Bash(clippy:*), Read, Write, Edit, Glob, Grep

What it can do on your machine

Read from SKILL.md and the folder at commit 2000ef8. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash(cargo:*)
  • Bash(rustc:*)
  • Bash(rustfmt:*)
  • Bash(clippy:*)
  • Read
  • Write
  • Edit
  • Glob
  • Grep

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • cargo

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

• Network

  Links to these hosts (documentation or services it may open):

  • github.com

  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.

• Compatibility

  Rust 1.70+, Cargo

  From compatibility in the SKILL.md frontmatter.

Context cost

Rust Best Practices loads about 1.1k tokens when it runs, and up to ~23k if it reads all its reference files. Until then it costs about 108 tokens; SKILL.md has 391 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~108

When it runs · the whole SKILL.md, loaded when a task matches

~1.1k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~23k

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

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 farm-fe/farm at commit 2000ef8, republished under its MIT licence (© farm-fe). 391 words, ~1,085 tokens.

name

rust-best-practices

description

Guide for writing idiomatic Rust code based on Apollo GraphQL's best practices handbook. Use this skill when: (1) writing new Rust code or functions, (2) reviewing or refactoring existing Rust code, (3) deciding between borrowing vs cloning or ownership patterns, (4) implementing error handling with Result types, (5) optimizing Rust code for performance, (6) writing tests or documentation for Rust projects.

allowed-tools

Bash(cargo:*), Bash(rustc:*), Bash(rustfmt:*), Bash(clippy:*), Read, Write, Edit, Glob, Grep

compatibility

Rust 1.70+, Cargo

license

MIT

metadata.author

apollographql

metadata.version

1.1.0

struct Connection<State> { /* ... */ _state: PhantomData<State> }
struct Disconnected;
struct Connected;

impl Connection<Connected> {
    fn send(&self, data: &[u8]) { /* only connected can send */ }
}

© farm-fe, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 9 other files (references) in .agents/skills/rust-best-practices of farm-fe/farm.

• SKILL.md
• references/chapter_01.md
• references/chapter_02.md
• references/chapter_03.md
• references/chapter_04.md
• references/chapter_05.md
• references/chapter_06.md
• references/chapter_07.md
• references/chapter_08.md
• references/chapter_09.md

Open the folder on GitHubat commit 2000ef8

Used in 4 other repositories

We found 5 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in farm-fe/farm, which our catalogue first saw on October 7, 2026.

• apollographql/apollo-mcp-server.agents/skills/rust-best-practices
• apollographql/skillsskills/rust-best-practices
• koolamusic/claudefilesskills/rust-best-practices
• aniadev/android-stream-desk.agents/skills/rust-best-practices