Playwright Test Agent Skill
Write a playwright test, make sure it runs, and is not flaky.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/PostHog/posthog --skill playwright-testWhat it tells the agent to use
found in the instruction textThe instruction itself
6 sections, as written by the authorRead @playwright/README.md for best practices, gotchas, and how to run tests.
Rules
- Follow the best practices in the README strictly
- After UI interactions, always assert on UI changes, do not assert on network requests resolving
- Keep looping until all tests pass. Do not give up or ask the user for help. You must resolve every failure yourself.
Instructions
You are to plan an end to end playwright test for a feature.
Step 1: Plan the test(s) to be done.
Use the Playwright MCP tools (e.g., mcp__playwright__browser_navigate, mcp__playwright__browser_click, mcp__playwright__browser_screenshot) to interact with the browser and plan your tests.
After your exploration, present the plan to me for confirmation or any changes.
Step 2: Implement the test plan
- Write the tests, making sure to use common patterns used in neighbouring files.
- Run the tests with
BASE_URL='http://localhost:8010' pnpm --filter=@posthog/playwright exec playwright test <file name> --retries 0 --workers 3 - Debug any failures. Look at screen shots, if needed launch the playwright mcp skills to interact with the browser. Go back to step 1 after attempting a fix.
Step 3: Ensure no flaky tests
After all tests pass in the file, run with --repeat-each 10 added to the command. This will surface any flaky tests.
If any test fails across the 10 runs, treat it as a real failure: go back to Step 2, debug, fix, and re-run Step 3. Do not proceed to Step 4 until every run of every test passes.
Step 4: Report
Once all tests pass, output a single line: Testing Complete
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How to use it
Take posthog/playwright-test 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.