Webapp testing

Skill Anoxxx/skillcache/examples/webapp-testing

MRU attention protocol for skills that learn from every use — zero compute

Install

npx -y skills add Anoxxx/skillcache --skill webapp-testing

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What its author says it does

Copied from the file, not written here

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

The file declares its own license as Original by Anthropic (Apache 2.0). Adapted here as an adaptive skills example.. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

3.2 KB, as published. Nobody here has run it

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 absolutely necessary.

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
        │        Then use the helper + write simplified Playwright script
        │
        └─ Yes → Reconnaissance-then-action:
            1. Navigate and wait for networkidle
            2. Take screenshot or inspect DOM
            3. Identify selectors from rendered state
            4. Execute actions with discovered selectors

Example: Using with_server.py

Single server:

python scripts/with_server.py --server "npm run dev" --port 5173 -- python your_automation.py

Multiple servers (e.g., backend + frontend):

python scripts/with_server.py \
  --server "cd backend && python server.py" --port 3000 \
  --server "cd frontend && npm run dev" --port 5173 \
  -- python your_automation.py

Reconnaissance-Then-Action Pattern

Inspect rendered DOM:

page.screenshot(path='/tmp/inspect.png', full_page=True)
content = page.content()
page.locator('button').all()

Identify selectors from inspection results
Execute actions using discovered selectors

Common Pitfall

❌ Don't inspect the DOM before waiting for networkidle on dynamic apps ✅ Do wait for page.wait_for_load_state('networkidle') before inspection

Best Practices

Use sync_playwright() for synchronous scripts
Always close the browser when done
Use descriptive selectors: text=, role=, CSS selectors, or IDs
Add appropriate waits: page.wait_for_selector() or page.wait_for_timeout()

Adaptive Heuristics

This skill maintains a HEURISTICS.md alongside this file. Load it at skill activation. After completing the task:

Did anything unexpected happen? (failure, workaround, surprise, user correction) → Append a one-line lesson to the TOP of HEURISTICS.md.
Did you rely on an existing heuristic? → Move it to the TOP (MRU promotion).
Does a heuristic contradict this SKILL.md? → SKILL.md wins. Note the conflict in the heuristic entry.

Keep heuristics ≤ 20 entries. When full, the bottom entry is the eviction candidate.