uv-python

Development

Use uv for missing Python dependencies, task-scoped virtual environments, temporary execution, and non-preinstalled Python tools.

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How to use this skill

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Source SKILL.md: https://github.com/yv1ing/Z3r0/blob/HEAD/sandbox/.agents/skills/uv-python/SKILL.md

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uv-python

Use uv for missing Python dependencies, task-scoped virtual environments, temporary execution, and Python tools that are not already preinstalled. The image is configured to prefer the existing /usr/bin/python3 and to avoid uv-managed Python downloads.

Skill Loading Required

Before using uv to run or install a tool, load the dedicated skill for that tool when one exists. Do not use uvx, uv run --with, or uv tool install to recreate a bundled tool such as sqlmap, pwntools, checksec, or any tool listed by sandbox-shell.

Help First

Before constructing commands, use installed help as the source of truth:

uv --help
uv tool --help
uv pip --help

Usage Rules

Prefer preinstalled tools and their dedicated skills. Check command -v <tool> and installed help before any install step.
Create task virtual environments with uv venv --python /usr/bin/python3 <dir> only when a script needs dependencies outside the bundled toolset.
Install missing project dependencies with uv pip install --python <dir>/bin/python ....
Run temporary Python tools with uvx --python /usr/bin/python3 <tool> or uv tool run --python /usr/bin/python3 <tool> only when no preinstalled equivalent exists.
Install persistent Python CLI tools with uv tool install --python /usr/bin/python3 --no-python-downloads <tool> only when repeated use is required and the tool is not already in the image.
Run one-off Python with extra packages using uv run --python /usr/bin/python3 --with <package> python ... only for missing dependencies or a deliberately isolated environment.
Prefer the existing /usr/bin/python3; do not let uv download another Python unless the user explicitly asks.
Do not use global pip install unless the user explicitly asks and the reason is recorded.

Common Workflows

Create an isolated task environment:

uv venv --python /usr/bin/python3 .venv
uv pip install --python .venv/bin/python requests

Run one-off Python with a temporary dependency:

if python3 -c 'import requests' 2>/dev/null; then
  python3 script.py
else
  uv run --python /usr/bin/python3 --with requests python script.py
fi

Run a temporary CLI tool without installing it globally, only when it is not already bundled:

command -v ruff >/dev/null || uvx --python /usr/bin/python3 ruff --help

Install a persistent Python CLI tool only when it is absent and meant to stay available for repeated task use:

command -v <tool> >/dev/null || uv tool install --python /usr/bin/python3 --no-python-downloads <tool>

Output

Report the uv command used, virtual environment or tool path, installed packages, and any reproducibility notes.