Agent skill

python-quality-tooling

Use when configuring or running Python quality tools (ruff, ty, pytest, coverage, CI gates) and when enforcing a pre-merge quality checklist.

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/python-quality-tooling

SKILL.md

Python Quality Tooling

Overview

Use ruff, ty, and pytest consistently through uv. Core principle: one repeatable quality gate across local and CI.

Quick Reference

Task Command
Lint uv run ruff check
Auto-fix uv run ruff check --fix
Format uv run ruff format
Type check uv run ty check
Test uv run pytest
Coverage uv run pytest --cov=src --cov-report=term-missing
Full gate (prek) prek run -a
Install git hooks (prek) prek install

Workflow

  • Install tools as dev deps (see python-uv-project-setup).
  • Run all checks before commit.
  • Keep CI aligned with local commands.
  • If the repo uses prek, prefer prek run -a as the single quality gate.
  • Pytest tests MUST be function-based (no class-based tests or unittest.TestCase).

Example

Pre-merge gate:

bash
uv run ruff check --fix
uv run ruff format
uv run ty check
uv run pytest --cov=src --cov-report=term-missing

Common Mistakes

  • Running tools outside uv (drifts from project env).
  • Skipping prek run -a when a repo standardizes on prek.
  • Running only one tool and calling it done.

Red Flags

  • Direct ruff/pytest invocations without uv run.
  • Mixing pre-commit and prek commands in the same repo.
  • Class-based pytest tests (class Test*) or unittest.TestCase usage.

References

  • references/quality.md - Full command set and CI example
  • references/quality.md - Prek install and usage notes (prefer uv tool install prek)

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