astral-uv

Development

Fast Python package and project management using Astral's uv. Use when installing packages, managing virtual environments, running Python scripts, or initializing Python projects. Triggers on: pyproject.toml, requirements.txt, Python dependency discussions, virtual environment setup.

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How to use this skill

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Review the proposed files and risks before you approve installation.

Prompt to paste

I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/astral-uv/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/astral-uv/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Astral UV

UV is an extremely fast Python package installer and resolver written in Rust.

Quick Reference

Task	Command
Create venv	`uv venv`
Install package	`uv pip install <pkg>`
Add dependency	`uv add <pkg>`
Run script	`uv run <script.py>`
Sync dependencies	`uv sync`
Init project	`uv init`

Project Management

Initialize a new project:

uv init my-project
cd my-project

Add dependencies (updates pyproject.toml automatically):

uv add requests httpx
uv add --dev pytest ruff

Sync environment with lockfile:

uv sync

Running Code

Run scripts without manual venv activation:

uv run python script.py
uv run pytest
uv run ruff check .

Run with inline dependencies:

uv run --with requests script.py

Virtual Environments

uv venv                    # Create .venv
uv venv --python 3.12      # Specific Python version

pip Interface

Drop-in pip replacement (10-100x faster):

uv pip install requests
uv pip install -r requirements.txt
uv pip compile requirements.in -o requirements.txt

Python Version Management

uv python install 3.12     # Install Python version
uv python list             # Show available versions
uv python pin 3.12         # Pin version for project

Best Practices

Prefer uv add over uv pip install for project dependencies
Use uv run instead of activating venvs manually
Commit uv.lock to version control
Use uv sync --frozen in CI for reproducible builds
Add dev dependencies with uv add --dev