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Fast Python environment management with uv (10-100x faster than pip).
Passed 20 of 23 test cases with the skill, and 15 of 23 without it.
and 3 more in the full report
5 fixed15 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
I need to quickly create a standalone virtual environment folder without creating a full pyproject.toml project structure or pinning lockfiles. What is the command to create a bare virtual environment?
| Checked | Without skill | With skill |
|---|---|---|
| Uses `uv venv` to create the virtual environment. | Missed | Passed |
| Explains that bare venv creation creates an isolated environment without setting up a project workspace. | Missed | Passed |
The instructions your model reads when the skill loads.
Fast Python environment management with uv. Prefer the uv project workflow
(uv add / uv sync / uv run) over the uv pip compatibility layer — it
manages pyproject.toml + a lockfile for you and is reproducible.
| Task | Command |
|---|---|
| Start a project | uv init <name> (app) · uv init --package <name> (installable, src/ layout) |
| Add dependency | uv add httpx |
| Add dev dependency | uv add --dev pytest ruff |
| Remove dependency | uv remove httpx |
| Sync env from lockfile | uv sync |
| Run in project env | uv run pytest |
| Update lockfile | uv lock |
| Install a CLI tool | uv tool install ruff · one-shot: uvx ruff |
| Install a Python | uv python install 3.12 |
# Application (flat layout, no package build)
uv init myapp
# Installable package (src/ layout — separate tests/ that import by name)
uv init --package wordtools
# → src/wordtools/__init__.py, pyproject.toml with build-system
uv init creates pyproject.toml, pins a Python version, and prepares the
project for uv add / uv sync. The --package (src) layout is preferred for
anything with a test suite or that you intend to ship.
# Add runtime deps (writes to [project.dependencies] + updates the lockfile)
uv add "httpx>=0.25" pydantic
test cases passed, vs 15 / 23 without
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