Official · by Anthropic

Web app testing Claude skill

The Web app testing skill lets an AI assistant verify frontend behavior, troubleshoot UI problems, take screenshots, and check browser logs for local web apps.

Apache-2.0 licence
★ 182,168 on GitHub (whole repository)
Verified against its source 19 Oct 2026

View SKILL.md Repository

What the Web app testing skill does

Built on Playwright, this skill gives the assistant a set of tools for working with and examining local web apps. It can confirm that frontend features work, investigate UI behavior, grab browser screenshots, and read browser logs. An included script handles starting and stopping servers and can run several at once.

What it covers

Verify frontend functionality
Debug UI behavior
Capture browser screenshots
View browser logs
Manage local server lifecycle with with_server.py helper

How to install it

In Claude Code

/plugin marketplace add anthropics/skills

/plugin install example-skills@anthropic-agent-skills

This plugin also installs: algorithmic-art, brand-guidelines, canvas-design, doc-coauthoring, frontend-design, internal-comms, mcp-builder, skill-creator, slack-gif-creator, theme-factory, web-artifacts-builder.

What you need

In its documentation's own words:

“To test local web applications, write native Python Playwright scripts”

Steps change between versions. Check the official instructions before you install.