Is the Designing Python APIs skill free?

Yes. The skill itself is free from wdm0006/python-skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Designing Python APIs SkillProof Score?

9.2/10 — installs cleanly 4/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.

How do I install Designing Python APIs?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Designing Python APIs with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Designing Python APIs

Python library API design: naming, signatures, deprecation, fail-loud error handling.

by wdm0006 · wdm0006/python-skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 14, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 40281a1

Ran a real API design task (add_task with optional priority/due/recurring/notify): the skill's version enforced keyword-only args to kill a boolean-trap bug the baseline shipped as-is, plus a custom exception hierarchy with hints instead of a bare Exception.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 4/5
Triggers reliably 5/5
Output vs. baseline 9/10
Docs & honesty 5/5

What Designing Python APIs does

Guides the design of Python library APIs — progressive disclosure, keyword-only argument patterns, custom exception hierarchies, and a detailed 'fail loud, not silent' checklist for avoiding masked errors. Triggers when designing a new library API, reviewing an existing one, or planning a deprecation/versioning change; links out to a companion release-management skill for the deprecation mechanics.

How to install Designing Python APIs

git clone https://github.com/wdm0006/python-skills
cd python-skills
mkdir -p ~/.claude/skills
cp -r skills/python/api-design ~/.claude/skills/designing-python-apis

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Designing Python APIs

/designing-python-apis Python library API design: naming, signatures, deprecation, fail-loud error handling.

It also activates on plain-language prompts like these:

Help me design the public API for a new Python caching library.
Review this library's function signatures before we hit v1.0.
How should I deprecate a parameter without breaking callers?

Frequently asked questions

Is the Designing Python APIs skill free?: Yes. The skill itself is free from wdm0006/python-skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Designing Python APIs work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 14, 2026. Verdict: Tested · Works. Ran a real API design task (add_task with optional priority/due/recurring/notify): the skill's version enforced keyword-only args to kill a boolean-trap bug the baseline shipped as-is, plus a custom exception hierarchy with hints instead of a bare Exception.
What is the Designing Python APIs SkillProof Score?: 9.2/10 — installs cleanly 4/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.
How do I install Designing Python APIs?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Designing Python APIs with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.