webapp-testing

Originally fromanthropics/skills
Installation
Summary

Native Python Playwright toolkit for testing and debugging local web applications with server lifecycle management.

  • Includes with_server.py helper script for managing single or multiple server instances automatically during test execution
  • Supports reconnaissance-then-action workflow: screenshot/inspect rendered DOM, identify selectors, then execute interactions
  • Provides example scripts covering element discovery, static HTML automation, and console log capture
  • Emphasizes waiting for networkidle on dynamic apps before DOM inspection to avoid timing issues
SKILL.md

Web Application Testing

To test local web applications, write native Python Playwright scripts.

Helper Scripts Available:

  • scripts/with_server.py - Manages server lifecycle (supports multiple servers)

Always run scripts with --help first to see usage. DO NOT read the source until you try running the script first and find that a customized solution is abslutely necessary. These scripts can be very large and thus pollute your context window. They exist to be called directly as black-box scripts rather than ingested into your context window.

Decision Tree: Choosing Your Approach

User task → Is it static HTML?
    ├─ Yes → Read HTML file directly to identify selectors
    │         ├─ Success → Write Playwright script using selectors
    │         └─ Fails/Incomplete → Treat as dynamic (below)
    └─ No (dynamic webapp) → Is the server already running?
        ├─ No → Run: python scripts/with_server.py --help
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Jan 20, 2026