Terminal.skills
Skills/ruff
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ruff

Lint and format Python with Ruff. Use when a user asks to set up Python linting, replace flake8/black/isort, configure code quality rules, or speed up Python code formatting.

#ruff#linting#formatting#python#code-quality
terminal-skillsv1.0.0
Works with:claude-codeopenai-codexgemini-clicursor
Source

Usage

$
✓ Installed ruff v1.0.0

Getting Started

  1. Install the skill using the command above
  2. Open your AI coding agent (Claude Code, Codex, Gemini CLI, or Cursor)
  3. Reference the skill in your prompt
  4. The AI will use the skill's capabilities automatically

Example Prompts

  • "Review the open pull requests and summarize what needs attention"
  • "Generate a changelog from the last 20 commits on the main branch"

Information

Version
1.0.0
Author
terminal-skills
Category
Development
License
Apache-2.0

Documentation

Overview

Ruff is an extremely fast Python linter and formatter written in Rust. It replaces flake8, black, isort, pyupgrade, pydocstyle, and dozens more tools — running 10-100x faster. One tool for all Python code quality.

Instructions

Step 1: Setup

bash
pip install ruff

Step 2: Configuration

toml
# pyproject.toml — Ruff configuration
[tool.ruff]
target-version = "py311"
line-length = 100
src = ["src", "tests"]

[tool.ruff.lint]
select = [
    "E",    # pycodestyle errors
    "W",    # pycodestyle warnings
    "F",    # pyflakes
    "I",    # isort (import sorting)
    "B",    # flake8-bugbear
    "C4",   # flake8-comprehensions
    "UP",   # pyupgrade
    "SIM",  # flake8-simplify
    "TCH",  # flake8-type-checking
    "RUF",  # ruff-specific rules
]
ignore = [
    "E501",   # line too long (handled by formatter)
]
fixable = ["ALL"]

[tool.ruff.lint.isort]
known-first-party = ["my_app"]

[tool.ruff.format]
quote-style = "double"
indent-style = "space"
docstring-code-format = true

Step 3: Use

bash
# Lint
ruff check .                   # check all files
ruff check . --fix             # auto-fix issues
ruff check . --fix --unsafe-fixes  # include risky auto-fixes

# Format
ruff format .                  # format all files
ruff format --check .          # check without modifying (CI)

# Watch mode
ruff check --watch .

Step 4: Pre-commit Hook

yaml
# .pre-commit-config.yaml
repos:
  - repo: https://github.com/astral-sh/ruff-pre-commit
    rev: v0.3.0
    hooks:
      - id: ruff
        args: [--fix]
      - id: ruff-format

Step 5: CI Integration

yaml
# .github/workflows/lint.yml
- name: Lint with Ruff
  run: |
    ruff check . --output-format=github
    ruff format --check .

Guidelines

  • Ruff replaces flake8, black, isort, pyupgrade in a single tool — remove the old ones.
  • Start with a broad rule set (select = ["E", "W", "F", "I", "B", "UP"]) and expand.
  • ruff check --fix auto-fixes most issues — safe to run in pre-commit hooks.
  • Ruff processes the entire CPython codebase in under 200ms — linting is no longer a bottleneck.
  • Use ruff format as a drop-in replacement for black — same output, 100x faster.