MCPInstall

ruff-formatting

by laurigatesSecurity

Python code formatting with ruff format. Fast, Black-compatible formatter. Use when formatting Python files, enforcing style, or checking format compliance.

Installs
81
Last 24h
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Security
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/laurigates/claude-plugins --skill ruff-formatting
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads ruff-formatting automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

ruff Formatting

Expert knowledge for using ruff format as an extremely fast Python code formatter with Black compatibility.

When to Use This Skill

Use this skill when...Use another tool instead when...
Formatting Python filesLinting for code issues (use ruff check)
Checking format compliance in CIType checking (use basedpyright)
Migrating from BlackDetecting dead code (use vulture/deadcode)
Setting up format-on-saveRunning tests (use pytest)

Core Expertise

ruff format Advantages

  • 10-30x faster than Black
  • Drop-in Black replacement (99.9% compatible)
  • Written in Rust for performance
  • Supports Black's configuration options
  • Format checking and diff preview
  • Respects .gitignore automatically

Basic Usage

Simple Formatting

# Format current directory
ruff format

# Format specific files or directories
ruff format path/to/file.py
ruff format src/ tests/

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

Format Checking

# Check if files are formatted (exit code 1 if not)
ruff format --check

# Show diff without modifying files
ruff format --diff

# Check specific files
ruff format --check src/ tests/

# Preview changes before applying
ruff format --diff services/orchestrator
ruff format services/orchestrator  # Apply after review

Selective Formatting

# Format only Python files
ruff format src/**/*.py

# Format excluding tests
ruff format --exclude tests/

# Format only changed files (git)
git diff --name-only --diff-filter=d | grep '\.py$' | xargs ruff format

# Format files in specific directory
ruff format src/core/ src/utils/

Configuration

pyproject.toml

[tool.ruff]
line-length = 88
target-version = "py39"

[tool.ruff.format]
quote-style = "double"
indent-style = "space"
skip-magic-trailing-comma = false
line-ending = "auto"
docstring-code-format = true
docstring-code-line-length = "dynamic"
exclude = [
    "*.pyi",
    "**/__pycache__",
    "**/node_modules",
    ".venv",
]

ruff.toml (standalone)

line-length = 88

[format]
quote-style = "single"
indent-style = "space"
skip-magic-trailing-comma = false
docstring-code-format = true

Black Compatibility

[tool.ruff]
line-length = 88
indent-width = 4
target-version = "py39"

[tool.ruff.format]
quote-style = "double"
indent-style = "space"
skip-magic-trailing-comma = false
line-ending = "auto"

Format Workflow

  1. Preview: ruff format --diff (see changes)
  2. Check: ruff format --check (CI validation)
  3. Apply: ruff format (modify files)
  4. Verify: ruff format --check (confirm)

Best Practices

  • Pass directory parameter directly: ruff format src/
  • Preview changes first with --diff
  • Use one formatter per project (ruff format replaces Black)
  • Exclude generated files in pyproject.toml
  • Keep pre-commit config in sync with formatter choice
  • Enable docstring-code-format for better docs

Agentic Optimizations

ContextCommand
Format directoryruff format src/
Check formattingruff format --check
Show diffruff format --diff
CI check + diffruff format --check --diff
Format + lintruff format && ruff check
Format changed filesgit diff --name-only --diff-filter=d | grep '\.py$' | xargs ruff format

Quick Reference

Essential Commands

ruff format                         # Format current directory
ruff format path/to/dir             # Format specific directory
ruff format --check                 # Check if formatted
ruff format --diff                  # Show formatting changes
ruff format file1.py file2.py       # Format specific files
ruff format --exclude tests/        # Exclude directory
ruff format --line-length 100       # Override line length

Format vs Check

CommandPurposeExit CodeModifies Files
ruff formatFormat files0Yes
ruff format --checkValidate formatting1 if unformattedNo
ruff format --diffShow changes0No
ruff format --check --diffValidate + show1 if unformattedNo

Configuration Quick Start

Minimal (Black-compatible)

[tool.ruff]
line-length = 88

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

Recommended

[tool.ruff]
line-length = 88
target-version = "py311"

[tool.ruff.format]
quote-style = "double"
indent-style = "space"
skip-magic-trailing-comma = false
docstring-code-format = true
line-ending = "auto"
exclude = [
    "*.pyi",
    "migrations/**/*.py",
]

For detailed examples, advanced patterns, integration guides, and migration checklists, see REFERENCE.md.

FAQ

What does the ruff-formatting skill do?

Python code formatting with ruff format. Fast, Black-compatible formatter. Use when formatting Python files, enforcing style, or checking format compliance.

How do I install ruff-formatting?

Run npx skills add https://github.com/laurigates/claude-plugins --skill ruff-formatting in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/ruff-formatting/ (personal) or .claude/skills/ruff-formatting/ (project).

Which AI agents can use ruff-formatting?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is ruff-formatting safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains ruff-formatting?

It is published by laurigates in laurigates/claude-plugins. It has 81 recorded installs.

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