# ruff-linting

Equips your coding assistant with ruff check workflows, auto-fixing commands, and pyproject.toml lint rules for Python repositories.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 474 installs · ★ 59
- Author: laurigates
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/laurigates/claude-plugins/tree/HEAD/python-plugin/skills/ruff-linting/SKILL.md
- Updated: 2026-10-25
- HTML: https://affpapa.org/en/nevibecode/skills/ruff-linting

## What it does

This skill guides the agent on running `ruff check` across Python projects to catch bugs, sort imports, and flag deprecated syntax. It outlines rule sets such as `E`, `F`, and `UP`, replacing legacy setups based on Flake8 or pylint. Under the hood, the skill permits execution of `ruff` and `uv` commands alongside file reading and editing tools.

Directory handling requires passing folder targets directly as arguments rather than switching into them with `cd`. This maintains execution from the repository root and keeps path resolution predictable. Note that code layout tasks belong elsewhere; code styling is directed to the sibling `ruff-formatting` skill.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add laurigates/claude-plugins --skill ruff-linting -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/ruff-linting/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/ruff-linting/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add laurigates/claude-plugins --skill ruff-linting -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/ruff-linting/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add laurigates/claude-plugins --skill ruff-linting -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/ruff-linting/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install laurigates/claude-plugins ruff-linting
```

2. **Manually: put the files in place**
- File: `.github/skills/ruff-linting/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add laurigates/claude-plugins --skill ruff-linting -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/laurigates/claude-plugins --path python-plugin/skills/ruff-linting
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/ruff-linting/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add laurigates/claude-plugins --skill ruff-linting -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/laurigates/claude-plugins/tree/HEAD/python-plugin/skills/ruff-linting/SKILL.md

## When to use it
- run `ruff check` with safe auto-fixes via `--fix`
- configure `[tool.ruff.lint]` options and `per-file-ignores` in `pyproject.toml`
- inspect rule explanations such as `F401` or `B006`
- integrate ruff into GitHub Actions workflows and pre-commit hooks

## Example prompts
- Run ruff check on the `src/` directory and preview changes with `--diff`
- Update `pyproject.toml` to enable Pyflakes and bugbear lint rules
- Show why rule `F401` fails and ignore it inside `__init__.py` files

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 2d41fe3d91a13a57.

BEGIN THIRD-PARTY FILE 2d41fe3d91a13a57
````text
---
created: 2025-12-16
modified: 2026-05-29
reviewed: 2026-05-29
name: ruff-linting
description: Python linting with ruff. Fast linting, rule selection, auto-fixing, and config. Use when checking Python code quality, enforcing standards, or finding bugs.
user-invocable: false
allowed-tools: Bash(ruff *), Bash(python *), Bash(uv *), Read, Edit, Write, Grep, Glob
---

# ruff Linting

Expert knowledge for using `ruff check` as an extremely fast Python linter with comprehensive rule support and automatic fixing.

## When to Use This Skill

| Use this skill when... | Use a focused sibling instead when... |
|---|---|
| Running `ruff check`, selecting rule sets, or auto-fixing lint violations | Running `ruff format` to enforce code style — use ruff-formatting |
| Configuring `[tool.ruff.lint]` rules and per-file ignores in pyproject.toml | Comparing ruff against type-checkers and formatters at a stack level — use python-code-quality |
| Wiring ruff into editors, pre-commit, CI/CD, Docker, or build systems | See the quick forms in [CI/CD Integration](#cicd-integration) below; full editor/CI/Docker/migration recipes in [REFERENCE.md](REFERENCE.md) |
| Migrating from Flake8/pylint/isort/pyupgrade to ruff's combined rule set | Running `ruff format` to enforce code style — use ruff-formatting |

## Core Expertise

**ruff Advantages**
- Extremely fast (10-100x faster than Flake8)
- Written in Rust for performance
- Replaces multiple tools (Flake8, pylint, isort, pyupgrade, etc.)
- Auto-fix capabilities for many rules
- Compatible with existing configurations
- Over 800 built-in rules

## Basic Usage

### Simple Linting
```bash
# Lint current directory
ruff check

# Lint specific files or directories
ruff check path/to/file.py
ruff check src/ tests/

# IMPORTANT: Pass directory as parameter to stay in repo root
# ✅ Good
ruff check services/orchestrator

# ❌ Bad
cd services/orchestrator && ruff check
```

### Auto-Fixing
```bash
# Show what would be fixed (diff preview)
ruff check --diff

# Apply safe automatic fixes
ruff check --fix

# Fix specific files
ruff check --fix src/main.py

# Fix with preview (see changes before applying)
ruff check --diff services/orchestrator
ruff check --fix services/orchestrator
```

### Output Formats
```bash
# Default output
ruff check

# Show statistics
ruff check --statistics

# JSON output for tooling
ruff check --output-format json

# GitHub Actions annotations
ruff check --output-format github

# GitLab Code Quality report
ruff check --output-format gitlab

# Concise output
ruff check --output-format concise
```

## Rule Selection

### Common Rule Codes

| Code | Description | Example Rules |
|------|-------------|---------------|
| `E` | pycodestyle errors | E501 (line too long) |
| `F` | Pyflakes | F401 (unused import) |
| `W` | pycodestyle warnings | W605 (invalid escape) |
| `B` | flake8-bugbear | B006 (mutable default) |
| `I` | isort | I001 (unsorted imports) |
| `UP` | pyupgrade | UP006 (deprecated types) |
| `SIM` | flake8-simplify | SIM102 (nested if) |
````
END THIRD-PARTY FILE 2d41fe3d91a13a57

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