tooling

A guide for setting up common Python development tools: ruff for code checks and formatting, mypy for type checks, pytest for tests, pyscn for code structure analysis, and uv for package management.

In plain words
What is it for?
Use it when creating or updating a Python project's pyproject.toml, development workflow, or continuous-integration checks.
Why use it?
It helps a project choose and configure tools that catch mistakes, keep code consistent, manage dependencies, and support automated checks.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/ludo-technologies/python-best-practices/tooling
Any agent
npx skills add ludo-technologies/python-best-practices --skill tooling
Clone the repo
git clone --depth 1 https://github.com/ludo-technologies/python-best-practices

Made for: Claude Code, Codex.

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 921 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00060 $0.00921
Opus 5 $0.00030 $0.00461
Sonnet 5 $0.00012 $0.00184
Haiku 4.5 $0.00006 $0.00092

Measured yesterday against content hash f753bddb0776, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

tooling scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/tooling/SKILL.md · 131 lines

How it starts

The opening of the file, as written. The whole thing — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Python Tooling

A comprehensive guide to Python development tools. Configuration best practices for analysis, linters, type checkers, formatters, test frameworks, and package managers.

Why These Tools Matter

To write high-quality Python code, we recommend adopting these tools:

  • pyscn - Detect dead code, duplicates, and circular dependencies to prevent technical debt
  • ruff - Catch bugs and style violations early with fast static analysis
  • mypy - Find errors before runtime with type checking, also improves IDE completion
  • pytest - Build confidence in changes with reliable tests
  • uv - Improve developer experience with fast dependency management

Integrating these into CI/CD reduces code review burden and maintains consistent quality.

Categories

Analysis [HIGH]

Structural code analysis for quality assessment.

Rule Description
analysis-pyscn Dead code, clones, dependencies, complexity with pyscn

Linting [CRITICAL]

Static code analysis with ruff for consistent, high-quality code.

Rule Description
lint-ruff Fast, comprehensive linting with ruff

Type Checking [HIGH]

Static type checking with mypy for type safety and better IDE support.

Rule Description
type-mypy Static type checking with mypy

Formatting [HIGH]

Consistent code formatting with ruff format and import sorting.

Rule Description
fmt-ruff Code formatting and import sorting with ruff

Testing [HIGH]

Test framework configuration with pytest for reliable testing.

Rule Description
test-pytest Testing with pytest, fixtures, and coverage

Package Management [MEDIUM]

Modern Python packaging with uv and pyproject.toml.

Rule Description
pkg-uv Fast package management with uv
pkg-pyproject Project configuration with pyproject.toml

Read the full file on GitHub · 131 lines

Files

What ships with it

11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 131 lines · 60 tokens per session scan A f753bddb0776

Subscribe to this mod's changes

tooling is a skill published in the GitHub repository ludo-technologies/python-best-practices (18 stars, last pushed 3d ago), licensed MIT. It adds 60 tokens to every session and 921 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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