Some claims can't be settled by a single assertion. When the thing under test is a measured quantity — a noisy or probabilistic output, a latency, an accuracy/conversion/error rate — one sample is an anecdote and "it ran / it looks faster" is not a verdict. You settle it the way an experimentalist would: against a fixed reference set, compared to a baseline, with results saved, and a delta you can trust is real rather than noise.
Test The Non Deterministic is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/test-the-non-deterministic/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when a verdict rests on a measured quantity rather than a single deterministic assertion — a noisy/probabilistic output, a performance number, an accuracy or conversion rate. "It ran" or one lucky sample is not a verdict; bring experimental rigor (labelled reference set, a baseline/control, saved structured results, significance on the delta) and, for an AI/probabilistic component, score the distribution and red-team the guardrails.
The Test The Non Deterministic Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 117,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/test-the-non-deterministic curl -L https://claudskills.com/skills/test-the-non-deterministic/SKILL.md \ -o ~/.claude/skills/test-the-non-deterministic/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/test-the-non-deterministic/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/test-the-non-deterministic/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\test-the-non-deterministic\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
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SKILL.md from the source repository to ~/.claude/skills/test-the-non-deterministic/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Test The Non Deterministic is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{test-the-non-deterministic-2026,
author = {wastedcode},
title = {Test The Non Deterministic [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/test-the-non-deterministic/}
}Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.