An example test proves one point in the input space; a property test states a law, lets the framework hunt for a counterexample, and shrinks it to the smallest failing case. Use it where the acceptance criterion is a rule ("decode(encode(x)) == x", "output is sorted", "never loses an acknowledged write"), keep the generators honest, and turn every found failure into a permanent example.
Property Based Test is a community-contributed Claude Code skill in the research-methods sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/property-based-test/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when a ticket's correctness is about invariants over many inputs — parsers and serialisers, encoders/decoders, arithmetic and date logic, sorting and merging, state machines, concurrent operations and interleavings — anything with "for all inputs" in its contract, where example tests would miss the edge case; write property-based, model-based or race-condition tests with the repo's framework (fast-check, Hypothesis, proptest, jqwik, QuickCheck). Invoke for "round-trips", "should never crash on any input", "the invariant must hold", "under any interleaving", or after a bug an example test could not have caught.
The Property Based Test Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/property-based-test curl -L https://claudskills.com/skills/property-based-test/SKILL.md \ -o ~/.claude/skills/property-based-test/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/property-based-test/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/property-based-test/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\property-based-test\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 →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
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SKILL.md from the source repository to ~/.claude/skills/property-based-test/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. Property Based Test is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research 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{property-based-test-2026,
author = {tmj-90},
title = {Property Based Test [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/property-based-test/}
}Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all Science & Research 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.