What is python-package?

A reference guide for building Python packages: reusable software that other Python programs can install and use. It covers structure, configuration, type hints, tests, automation, documentation, releases, security, and public interfaces.

Use it while designing or improving a Python package, including its pyproject.toml configuration, public interface, tests, documentation, release process, and security practices.

It brings these decisions into one set of research-backed practices, reducing guesswork when creating or maintaining a package. It helps avoid common problems that make packages difficult to install, use, test, or maintain.

python-package — Plugin for Claude Code by oborchers/fractional-cto

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.

Clone the repo

git clone --depth 1 https://github.com/oborchers/fractional-cto

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/oborchers/fractional-cto/python-package/github.svg)](https://agentmods.dev/plugins/oborchers/fractional-cto/python-package)

Your own site

<a href="https://agentmods.dev/plugins/oborchers/fractional-cto/python-package"><img src="https://agentmods.dev/badge/plugins/oborchers/fractional-cto/python-package/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/oborchers/fractional-cto/python-package"><img src="https://agentmods.dev/badge/plugins/oborchers/fractional-cto/python-package.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 13 skills, 2 commands, 1 agent cost 1,598 tokens a session between them.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

python-package 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 3d ago.

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.

python-package/.claude-plugin/plugin.json · 25 lines

What it actually says

{
  "name": "python-package",
  "version": "1.0.1",
  "description": "Research-backed best practices for building modern, production-grade Python packages \u2014 project structure, pyproject.toml, typing, testing, CI/CD, documentation, versioning, API design, packaging, security, and developer experience",
  "author": {
    "name": "Dr. Oliver Borchers"
  },
  "repository": "https://github.com/oborchers/fractional-cto",
  "license": "MIT",
  "keywords": [
    "python",
    "packaging",
    "pyproject-toml",
    "pytest",
    "ruff",
    "mypy",
    "ci-cd",
    "documentation",
    "versioning",
    "api-design",
    "security",
    "best-practices"
  ]
}

Contents

What it installs

The manifest is a name and a version. 13 skills, 2 commands, 1 agent travel with it, and installing the plugin installs all of them — 1,598 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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.

3d ago First seen · 25 lines scan A 264d5b5a0fff

Subscribe to this mod's changes

python-package is a plugin published in the GitHub repository oborchers/fractional-cto (32 stars, last pushed 3d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-10-13.

Languages Python

python-package

Getting it into your agent

Wrote this? Show the measurements

Grade A, and why

Nothing flagged

What it actually says

What it installs

What this file has done since we first saw it

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