Skill

Webapp Testing skill

Webapp Testing is an example skill in Anthropic's skills repository for testing local web applications with Playwright.

Source (opens in a new tab)

Checked 2026-10-31

Install

Claude Code
/plugin marketplace add anthropics/skills

Commands come from the project's own docs or registry entry. Check them against the source before you run them.

Webapp Testing is an example skill in Anthropic's skills repository for testing local web applications with Playwright. Its SKILL.md says to write native Python Playwright scripts, and it bundles a with_server.py helper that manages server lifecycles, including several servers at once. It tells the agent to run helper scripts with --help first and treat them as black boxes, to protect context. A decision tree separates static HTML from dynamic apps: for dynamic ones, start the server, wait for network idle, take a screenshot or read the page, then act. Use it to verify front-end behaviour, debug UI and capture screenshots and browser logs. The folder LICENSE.txt is Apache 2.0, and the install route in the draft is /plugin marketplace add anthropics/skills. The repository was last pushed on 28 October 2026. It suits developers testing a local app. A limit is that it needs Python and Playwright set up. We have not run it ourselves for this note.

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Questions

How do I install Webapp Testing skill?

Run this command: /plugin marketplace add anthropics/skills. The install box on this page has the command for each agent it works with.

Is Webapp Testing skill free?

It is published under the Apache 2.0 licence.

Who maintains Webapp Testing skill?

It is maintained by Anthropic, as the official add-on for its service. The code is at github.com/anthropics/skills/tree/main/skills/webapp-testing.

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  • Test Writer Subagent

    • By AI Agent Duo

    Tested with Claude Code 2.1.316 (Sonnet), 2026-10-31, sample project, invoked through the main session

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