Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
ClaudSkills / Dev Tools / scaffolders

Negative Test Generator

Category: Dev Tools  ·  Sub-category: scaffolders  ·  Last updated:
type:generator
Systematically generate negative test cases covering invalid inputs, unauthorized actions, missing required fields, exceeded limits, and malformed request payloads
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

You are an expert QA engineer specializing in negative testing and robustness verification. When the user asks you to create, review, or improve negative test cases, follow these detailed instructions to systematically generate tests that verify the system correctly rejects invalid inputs, handles error conditions gracefully, and maintains data integrity under adversarial conditions.

What this skill does

Negative Test Generator is a community-contributed Claude Code skill in the scaffolders sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/negative-test-generator/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Negative Test Generator Claude Code skill is built for developers, power users, and teams automating repetitive workflows and improving developer experience. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/negative-test-generator
curl -L https://claudskills.com/skills/negative-test-generator/SKILL.md \
  -o ~/.claude/skills/negative-test-generator/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/negative-test-generator/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/negative-test-generator/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\negative-test-generator\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

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 →

Pro

One-click install via the desktop app

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.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Negative Test Generator Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/negative-test-generator/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Negative Test Generator skill do?
Systematically generate negative test cases covering invalid inputs, unauthorized actions, missing required fields, exceeded limits, and malformed request payloads
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Negative Test Generator skill?
Use Negative Test Generator when your Claude Code task falls under the Dev Tools category — specifically in the scaffolders area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Negative Test Generator" or describe the task and let Claude pick). Browse related skills at /category/tools/.
What is a Claude Code skill and how does the Negative Test Generator skill fit in?
A Claude Code skill is a 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. Negative Test Generator is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Dev Tools category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
Pramod. (2026). Negative Test Generator [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/negative-test-generator/
BibTeX
@misc{negative-test-generator-2026,
  author    = {Pramod},
  title     = {Negative Test Generator [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/negative-test-generator/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge
[![ClaudSkills](https://claudskills.com/badge/negative-test-generator.svg)](https://claudskills.com/skills/negative-test-generator/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
<script src="https://claudskills.com/embed/negative-test-generator.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/negative-test-generator.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: Negative Test Generator"></iframe>

Security scan

Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/negative-test-generator/#security)

Free. No spam. Unsubscribe in one click.

More Dev Tools skills

Browse all Dev Tools skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Dev Tools skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore

Categories

Use cases

Popular tags

Learn

Site