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Browser Testing With Devtools

Browser Testing With Devtools is an agent skill (a SKILL.md file) from addyosmani/agent-skills. Tests in real browsers via Chrome DevTools MCP. It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 113,791 GitHub stars across a repository of 14 listed skills.

github.com/addyosmani/agent-skills/skills/browser-testing-with-devtools (opens in a new tab)

Data as of from the GitHub API and skills.sh; description from the skill's SKILL.md. Report an error

View on GitHub (opens in a new tab)View on skills.sh (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add addyosmani/agent-skills
/plugin install agent-skills@addy-agent-skills

In the Claude apps, zip the browser-testing-with-devtools folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/addyosmani/agent-skills.git
cp -r agent-skills/skills/browser-testing-with-devtools .agents/skills/browser-testing-with-devtools   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/addyosmani/agent-skills.git
cp -r agent-skills/skills/browser-testing-with-devtools .cursor/skills/browser-testing-with-devtools   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Tests in real browsers via Chrome DevTools MCP. Use when building or debugging anything that runs in a browser. Use when you need to inspect the DOM, capture console errors, analyze network requests, profile performance, or verify visual output with real runtime data. Requires the chrome-devtools MCP server to be configured. Use Chrome DevTools MCP to give your agent eyes into the browser.

When it triggers

  • Use when building or debugging anything that runs in a browser.
  • Use when you need to inspect the DOM, capture console errors, analyze network requests, profile performance, or verify visual output with real runtime data.

More skills in addyosmani/agent-skills

14 skills are listed from this repository.

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All Testing & QA

FAQ

Browser Testing With Devtools FAQ

Still curious? Email info@appsgit.com.

How do I install the Browser Testing With Devtools skill?

In Claude Code, run /plugin marketplace add addyosmani/agent-skills and then /plugin install agent-skills@addy-agent-skills. For Codex or Cursor, copy the browser-testing-with-devtools folder into .agents/skills/ or .cursor/skills/.

Is the Browser Testing With Devtools skill free?

Yes. The repository is open source under the MIT license.

Is Browser Testing With Devtools maintained?

The repository's most recent commit was on Nov 1, 2026. Its latest release is 0.6.15. appsgit only lists skills from repositories with a commit in the last six months.