Webapp Testing Agent Skill
Use this skill to build features or debug anything that uses a webapp frontend.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/microsoft/FluidFramework --skill webapp-testingThe instruction itself
2 sections, as written by the author<required>
*CRITICAL* Add the following steps to your Todo list using TodoWrite:
<system-reminder>From this point on, ignore any existing tests until you have a working example validated through a new playwright file.</system-reminder>
- Install playwright. Use the SDK that best matches the codebase. Default to python.
- Write a playwright config file. Make sure you use reporter: 'list' mode.
- If using python, you *must* use a virtual env.
- Check to see if you require authentication. If you do, ask me for credentials.
<system-reminder>Do NOT use mock mode or test harnesses. You should be testing the real thing.</system-reminder>
- Write and run a playwright script that lets you interact with the webapp frontend.
- Follow these steps in a loop until the bug is fixed:
- Add many logs to the server and to the UI. You *MUST* do this on every loop.
- Start the server and the UI.
- Run the playwright script and identify what is happening. Take screenshots, read logs, do whatever you need to.
- Update the playwright script.
<system-reminder>If you get stuck: did you add logs?</system-reminder>
- Run a final demonstration of the playwright browser NOT in headless mode. This is to show me directly what you accomplished.
- Clean up all background jobs and close any browsers.
- Make sure other tests pass.
</required>
Web Application Testing
To test local web applications, write native Python Playwright scripts. Your
testing should be as close to 'real' as possible.
Example
Identify the server
Single server:
npm run dev" --port 5173
Multiple servers (e.g., backend + frontend):
cd backend && python server.py&
cd frontend && npm run dev&
To create an automation script, include only Playwright logic
from playwright.sync_api import sync_playwright
with sync_playwright() as p:
browser = p.chromium.launch(headless=True) # Always launch chromium in headless mode
page = browser.new_page()
page.goto('http://localhost:5173') # Server already running and ready
page.wait_for_load_state('networkidle') # CRITICAL: Wait for JS to execute
# ... your automation logic
browser.close()
<system-reminder>If Playwright is not available, install it in a virtual env.</system-reminder>
Do NOT get in a loop where you just keep running tests. In this mode, you should ignore tests entirely until it works.
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How to use it
Take microsoft/webapp-testing from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.