rust-best-practices SKILL.md skillA
rust-best-practices from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add majiayu000/spellbook/rust-best-practices@git:20260605.9a7bea3Pins git:20260605.9a7bea3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- majiayu000/spellbook
- Path
skills/rust-best-practices/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260605.9a7bea3, committed Jun 5, 2026
- First version recorded
- Jan 15, 2026
- Size
- 3,846 bytes
- Repository stars
- 289
- License
- MIT
Use when writing, modifying, or reviewing Rust code. ALWAYS invoke before Rust edits; covers Microsoft Pragmatic Rust guidance for error handling, API design, performance, and idiomatic patterns.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Rust Best Practices
Based on Microsoft Pragmatic Rust Guidelines and Rust community standards.
## Core Principles
1. **Leverage the type system** — Use types to make invalid states unrepresentable
2. **Embrace ownership** — Work with the borrow checker, not against it
3. **Explicit over implicit** — Be clear about fallibility, mutability, and lifetimes
4. **Zero-cost abstractions** — Use iterators, generics, and traits without runtime cost
5. **Fail fast, recover gracefully** — Validate early, handle errors explicitly
---
## Error Handling
### Use `thiserror` for Libraries
```rust
use thiserror::Error;
#[derive(Error, Debug)]
pub enum MyError {
#[error("IO error: {0}")]
Io(#[from] std::io::Error),
#[error("Parse error at line {line}: {message}")]
Parse { line: usize, message: String },
#[error("Not found: {0}")]
NotFound(String),
}
```
### Use `anyhow` for Applications
```rust
use anyhow::{Context, Result};
fn main() -> Result<()> {
let config = load_config()
.context("Failed to load configuration")?;
run_app(config)?;
Ok(())
}
```
### Never Panic in Libraries
```rust
// ❌ BAD
pub fn get_item(index: usize) -> &Item {
…Read the whole file at its exact version.
How to install
mdr add majiayu000/spellbook/rust-best-practices@sha256:3935300c3834704cThe line at the top of this page pins the label git:20260605.9a7bea3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_cejf64qovry6rz6b)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jan 15, 2026 and Jun 5, 2026, about one every 71 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260605.9a7bea3 latest | 2026-06-05 | 9a7bea3 | 3,846 B | A | view · diff |
| git:20260605.a09e45c | 2026-06-05 | a09e45c | 6,824 B | A | view · diff |
| git:20260115.112b20c | 2026-01-15 | 112b20c | 6,826 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3846 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
majiayu000/spellbook · 289 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cejf64qovry6rz6b GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/rust-best-practices GET https://markdownregistry.com/api/v1/blob/3935300c3834704c39e51f80b0750da50783cec701630b833e981285975d37a1
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from majiayu000/spellbook
Every file in majiayu000/spellbook