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setup-python-env — Claude Code skill: venv and Reflex setup

Creates a Python virtual environment and installs Reflex. Useful when a project has no .venv or imports fail because packages are missing.

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

What setup-python-env does

The skill runs in three steps. First it checks the project root for a .venv directory; if one is there, it activates it and jumps straight to installing Reflex. If not, the agent picks a tool: with uv present it runs uv venv .venv, otherwise it falls back to python3 -m venv .venv and upgrades pip.

Python version gets checked before anything is created. Anything older than 3.10 stops the run, and the agent tells you to install a newer Python. Worth checking your version up front if you are on an older machine.

Reflex is installed according to the path taken: uv add reflex or pip install reflex. Before that, the skill checks whether the package is already there, so it does not repeat work.

What it helps with

  • create a .venv in a fresh project
  • install Reflex without choosing between uv and pip by hand
  • set up an environment when imports fail on missing packages
  • check the Python version before starting a project
  • activate an existing environment instead of recreating it

Example prompts for the agent

  • Set up the Python environment and install Reflex
  • There is no .venv here, get everything ready to run Reflex
  • Imports are broken — sort out the environment and dependencies

How to install setup-python-env

1Skills CLI (Vercel)

npx skills add reflex-dev/agent-skills --skill setup-python-env -a claude-code

2Manually: put the files in place

~/.claude/skills/setup-python-env/SKILL.md

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

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

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Nearby in Agent setup: memory, context, orchestration

All skills for Agent setup: memory, context, orchestration →

Questions about setup-python-env

How do I install setup-python-env in Claude?

Run npx skills add reflex-dev/agent-skills --skill setup-python-env -a claude-code. The skill file then lands at ~/.claude/skills/setup-python-env/SKILL.md.

What does setup-python-env do?

It creates a Python virtual environment and installs Reflex. If .venv already exists, the skill just activates it.

Which Python version is required?

3.10 or newer. On an older version the skill stops and asks you to update Python.

See also

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