Muggle Test
Change-driven E2E acceptance testing: detects the user's recent changes (local diff, branch, or PR), maps them to the user flows they affect, and runs real-browser tests on localhost or a preview/staging URL. Use whenever the user wants their own work validated before it ships — \"make sure I didn't break anything\", \"did my recent commits break any user flows?\", \"test before I push\" — the pre-merge acceptance gate. The signal is validation tied to a commit, push, PR, merge, or release; it holds even when the request never says E2E or browser. Invoke it first, before reading the diff or running anything: finding what changed and what it affects is this skill's own first step, and unit tests, a build, or eyeballing the diff do not substitute for the acceptance run the user asked for. Unstated scope (a chunk of work, a refactor, a sprint, a deploy preview) is its input, not a reason to investigate first. One named flow: muggle-test-feature-local; importing spec files: muggle-test-import.
Security AStatic scan found no risk patternsHow grading works ›
From the source SKILL.md
A router skill that detects code changes, resolves impacted test cases, executes them locally or remotely, reads the cloud results from the Muggle AI dashboard (local runs are published by the studio during execution; remote runs publish cloud-side), and posts E2E acceptance summaries to the PR. The user can invoke this at any moment, in any state.
What this skill does
Muggle Test is a community-contributed Claude Code skill in the product-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/muggle-test/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use whenever the user wants their own work validated before it ships — \"make sure I didn't break anything\", \"did my recent commits break any user flows?\", \"test before I push\" — the pre-merge acceptance gate. The signal is validation tied to a commit, push, PR, merge, or release; it holds even when the request never says E2E or browser.
Who uses this skill
The Muggle Test Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. 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/muggle-test
curl -L https://claudskills.com/skills/muggle-test/SKILL.md \
-o ~/.claude/skills/muggle-test/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/muggle-test/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/muggle-test/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\muggle-test\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.
Frequently asked questions
How do I install the Muggle Test Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/muggle-test/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Muggle Test skill do?
Change-driven E2E acceptance testing: detects the user's recent changes (local diff, branch, or PR), maps them to the user flows they affect, and runs real-browser tests on localhost or a preview/staging URL. Use whenever the user wants their own work validated before it ships — \"make sure I didn't break anything\", \"did my recent commits break any user flows?\", \"test before I push\" — the pre-merge acceptance gate. The signal is validation tied to a commit, push, PR, merge, or release; it holds even when the request never says E2E or browser. Invoke it first, before reading the diff or running anything: finding what changed and what it affects is this skill's own first step, and unit tests, a build, or eyeballing the diff do not substitute for the acceptance run the user asked for. Unstated scope (a chunk of work, a refactor, a sprint, a deploy preview) is its input, not a reason to investigate first. One named flow: muggle-test-feature-local; importing spec files: muggle-test-import.
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 Muggle Test skill?
Use Muggle Test when your Claude Code task falls under the Product category — specifically in the product misc 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 Muggle Test" or describe the task and let Claude pick). Browse related skills at
/category/product/.
What is a Claude Code skill and how does the Muggle Test 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. Muggle Test is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product 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
multiplex-ai. (2026). Muggle Test [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/muggle-test/
BibTeX
@misc{muggle-test-2026,
author = {multiplex-ai},
title = {Muggle Test [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/muggle-test/}
}Embed this skill
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Security scan
Grade A · scanned 2026-10-25 — 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 ›
- ✓ Prompt injection
- ✓ Data exfiltration
- ✓ Supply chain
- ✓ Reverse shell
- ✓ Credentials
- ✓ Execution
- ✓ Filesystem
- ✓ Persistence
- ✓ Obfuscation
- ✓ Network
Show this grade on your repo (click to copy):
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