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Plain-word guides and superpowers for Claude Code, Codex and Gemini.

Web developers · 4 free picks · premium superpower

Testing: check that your site still works

A change by the assistant can break a form or a login that worked yesterday, and many small sites have no tests. Browser add-ons let the assistant click through the site like a visitor. Engineering skills make it write a test before it changes code.

Free picks (tested by us)

Most useful first. Each one was installed on a clean test system; start with the first, try it, then add the next.

  1. RecommendedskillInstalls cleanly

    Good habits for building websites

    Addy Osmani Agent Skills

    Good working habits for building websites: clear plans, tests and reviews.

    Test: installs cleanly and works without an account. Not yet used on real work.

    EveryoneWatch outThe skills are text instructions, so the direct risk is low. The agent still runs commands that you approve.

    For any assistant
    Paste this in the terminal
    npx skills add addyosmani/agent-skills
    Other ways to install, and how we tested it
  2. RecommendedconnectorPartly tested (needs an account)

    Control a browser

    Playwright MCP

    Lets your assistant open web pages and click and type like you do.

    Test: installs cleanly; its main features need an account we did not use. Not yet used on real work.

    Good forWeb developers, Build an app, Daily work and researchWatch outIt controls a real browser and can open any web address, fill forms and click buttons. Do not point it at pages where a click can cost money or send messages.

    For Claude Code Also works with Codex CLI and Gemini CLI — see all steps
    Paste this in the terminal
    claude mcp add playwright npx @playwright/mcp@latest
    Other ways to install, and how we tested it
  3. RecommendedskillInstalls cleanly

    Plan, test and check its own work

    Superpowers

    Makes the assistant ask questions, plan, test and check its own work.

    Test: installs cleanly and works without an account. Not yet used on real work.

    EveryoneWatch outIt changes how the agent works. It asks many questions and may start helper agents, which uses more of your usage limit.

    For Claude Code Also works with Codex CLI and Gemini CLI — see all steps
    Type this inside Claude Code
    /plugin install superpowers@claude-plugins-official
    Other ways to install, and how we tested it
  4. agentInstalls cleanly

    Quality and security reviewers

    VoltAgent quality and security subagents

    Reviewers for quality and safety: a security auditor, a tester and an accessibility checker.

    Test: installs cleanly and works without an account. Not yet used on real work.

    Good forSecurity testing, Web developersWatch outThe pack includes a penetration-tester helper. Use it only on systems you own or may test in writing.

    For Claude Code
    Step 1 of 2 · Paste this in the terminal
    claude plugin marketplace add VoltAgent/awesome-claude-code-subagents
    See all 2 steps

Superpowers Pack · early access

Premium superpowers in the Superpowers Pack

  • Premium superpower

    Must-work checklist

    You write the five things that must work; it turns them into saved checks and runs them before each release.

Superpowers written and tested by us, set up with one command. Early access: join the list and we email you the day it opens.

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