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modern-python — Claude Code skill: uv, ruff, ty

Configures Python projects with a modern tooling stack: uv for dependency management, ruff for linting and formatting, ty for type checking. Use when starting new projects, writing scripts, or migrating from legacy tools.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add trailofbits/skills --skill modern-python -a claude-code
Open on GitHub

What modern-python does

The skill applies best practices based on the Trail of Bits cookiecutter template. It includes ready-made pyproject.toml configurations, project structure recommendations, and a reference table for switching from pip, Poetry, mypy, and black. Teaches you to use uv add for dependency management instead of manual edits, uv run for command execution without activating a virtual environment, and [dependency-groups] (PEP 735) to separate dev tools from production dependencies.

Includes security recommendations: shellcheck for shell scripts, detect-secrets for credential detection, pip-audit for dependency vulnerabilities. Provides migration examples: converting requirements.txt to pyproject.toml, replacing flake8+black+isort with ruff, mypy with ty. Handles both single-file scripts (PEP 723) and full packages.

What it helps with

  • bootstrap a new Python project with a modern tooling stack
  • migrate from pip and requirements.txt to uv
  • replace flake8, black, isort with ruff
  • switch from mypy to faster type checking with ty
  • set up pre-commit hooks using prek instead of slow pre-commit

Example prompts for the agent

  • Install the modern-python skill and create a new project with uv, ruff, and ty
  • Help me migrate this project from legacy tools to uv
  • Show me how to set up pyproject.toml correctly for Python 3.11+ with dev-dependency groups

How to install modern-python

1Skills CLI (Vercel)

npx skills add trailofbits/skills --skill modern-python -a claude-code

2Manually: put the files in place

~/.claude/skills/modern-python/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/modern-python/

From the same set35

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Questions about modern-python

How do I install modern-python in Claude Code?

Run npx skills add trailofbits/skills --skill modern-python -a claude-code, then open ~/.claude/skills/modern-python/SKILL.md for reference.

What does modern-python do?

Provides configurations and practices for a modern Python stack: dependency management via uv, linting and formatting via ruff, type checking via ty. Includes migration examples from pip, Poetry, mypy, and other legacy tools.

Does it require a specific Python version?

The skill targets Python 3.11 and newer. Tools can work with older versions, but configuration will need adjustment.

See also

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