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page-lab

Author Violentmonkey userscripts and diagnose live pages from one place — a measure-before-you-select method, a two-way element picker driven over the Chrome DevTools Protocol, a config-driven redesign acceptance runner that injects at document-start across real navigations and exercises the result with trusted events, performance/network/console diagnosis, and a Greasy Fork readiness linter, and a multi-agent method for redesigning a whole site.

Claude Code3 Skills

By Ismail KattakathLicense: MIT0 GitHub starsUpdated 2 hours ago

Directory evidence

Runtimes
Claude Code
Parsed components
3 skill or MCP entries
Source updated
Sep 24, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install page-lab for Claude Code

Installs for the current user
claude plugin marketplace add IchenDEV/agent-plugin-mkt
claude plugin marketplace update agent-plugin-marketplace
claude plugin install page-lab@agent-plugin-marketplace

Paste and run these commands in a terminal with Claude Code. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/kattakath/skills

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is plugins/page-lab/.

Plugin files

plugins/page-lab/
├── .claude-plugin/plugin.json
├── skills/page-diagnose/SKILL.md
├── skills/site-redesign/SKILL.md
└── skills/userscript-author/SKILL.md

Included Skills3

page-diagnoseskills/page-diagnose/SKILL.md

This skill should be used when the user asks why a page is slow, to record a performance trace, what network requests a page makes, why a request failed, to read the browser console, to debug a page in Chrome, to take a screenshot of a URL, to test a page at mobile width, or to emulate a slow connection. It drives a real Chrome over the DevTools Protocol through the `chrome-devtools-mcp` server.

site-redesignskills/site-redesign/SKILL.md

This skill should be used when the user wants a whole alternative experience for a site rather than one annoyance removed — "dark mode the entire site", "make the thumbnails fill the screen and put everything else in a menu", "rebuild this legacy app's shell", "redesign <site>", or any userscript that relocates the site's own controls, restyles every surface, or is expected to run past a few hundred lines. It runs a measure-first survey, builds against a keep-list, and verifies with trusted events at document-start before shipping.

userscript-authorskills/userscript-author/SKILL.md

This skill should be used when the user asks to make a site do X, write a userscript for a site, fix a broken userscript, remove or restyle an element that annoys them ("this site's sidebar annoys me", "hide this banner"), or publish a userscript to Greasy Fork. It authors a lint-clean Violentmonkey `.user.js` by measuring the live page first — never by guessing a selector — and can hand the operator a click-to-point element picker.

Plugin manifests1

plugins/page-lab/.claude-plugin/plugin.json
{
  "$schema": "https://anthropic.com/claude-code/plugin.schema.json",
  "name": "page-lab",
  "description": "Author Violentmonkey userscripts and diagnose live pages from one place — a measure-before-you-select method, a two-way element picker driven over the Chrome DevTools Protocol, a config-driven redesign acceptance runner that injects at document-start across real navigations and exercises the result with trusted events, performance/network/console diagnosis, and a Greasy Fork readiness linter, and a multi-agent method for redesigning a whole site.",
  "author": {
    "name": "Ismail Kattakath"
  },
  "homepage": "https://greasyfork.org/en/help/code-rules",
  "repository": "https://github.com/kattakath/skills",
  "license": "MIT",
  "keywords": [
    "userscript",
    "violentmonkey",
    "greasyfork",
    "chrome",
    "devtools",
    "cdp",
    "browser",
    "dark-mode",
    "redesign",
    "accessibility"
  ]
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[page-lab on Agent Plugins Marketplace](https://pluginsmp.com/plugins/page-lab)