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Python development with ruff, mypy, pytest - TDD and type safety
Passed 15 of 22 test cases with the skill, and 11 of 22 without it.
and 4 more in the full report
4 fixed11 passed either way7 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
List the shell commands for a CI quality pipeline that enforces linting, formatting check, type checking, and tests with coverage.
| Checked | Without skill | With skill |
|---|---|---|
| The workflow steps execute ruff check . for linting. | Passed | Passed |
| The workflow steps execute mypy src/ for type checking. | Missed | Passed |
The instructions your model reads when the skill loads.
typing module for complex typesmypy --strict in CIdef process_user(user_id: int, options: dict[str, Any] | None = None) -> User:
...
project/
├── src/
│ └── package_name/
│ ├── __init__.py
│ ├── core/ # Pure business logic
│ │ ├── __init__.py
│ │ ├── models.py # Pydantic models / dataclasses
│ │ └── services.py # Pure functions
│ ├── infra/ # Side effects
│ │ ├── __init__.py
│ │ ├── api.py # FastAPI routes
│ │ └── db.py # Database operations
│ └── utils/ # Shared utilities
├── tests/
│ ├── unit/
│ └── integration/
├── pyproject.toml
└── CLAUDE.md
test cases passed, vs 11 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.