playwright-e2e-mcp

playwright-e2e-mcp

The test doctor for AI agents.
Your Playwright test fails. Your AI finds out why, fixes it, and proves the fix works, or tells you it's a real bug.

⭐ If it saves you a debugging session, a star helps other Playwright users find it.

Quick start · Features · Tools · Tool reference · GitHub Action · Benchmark · Changelog

An MCP server and agent skill that gives Claude, Cursor, VS Code Copilot, Codex, Gemini and any other MCP client a full Playwright toolkit: a test runner, a failure detective and a fixer that checks its own work. Browser MCPs let an AI click around a page. This one lets it keep your test suite green, for TypeScript and Python suites, on your laptop and in CI. Free, MIT, no account.

❌ Without it / ✅ With it

Without it, your agent sees Timeout 5000ms exceeded waiting for getByTestId('checkout'), guesses a new selector, edits the test and hopes. Or it "fixes" the test by deleting the assertion that caught a real bug.

With it, your agent reads the page as it was when the test failed (from the Playwright trace), swaps in a locator proven unique on that page, re-runs the test and keeps the edit only if it passes. When the button is really gone, it says so: that's an app bug, not a test to patch. And a heal guard blocks any "fix" that went green by checking less.

flowchart LR
  A["run-test<br/>or load-report (CI)"] --> B["get-failure<br/>DOM at failure, requests, console"]
  B --> C{"suggest-fix"}
  C -->|"locator proven on the page"| D["apply + re-run"]
  D -->|green| E["✅ fixed and verified"]
  D -->|still red| F["↩️ edit reverted"]
  C -->|"element really gone"| G["🐞 reported as an app bug"]
  D -.-> H["check-test-change<br/>blocks fixes that check less"]

⚡ Quick start

Run this in your project root. It adds the server to every MCP client config it finds (Claude Code, Cursor, VS Code, Gemini CLI, Codex), installs the agent skill and leaves your other servers alone:

npx -y playwright-e2e-mcp init      # --client all | cursor,vscode … · --dry-run
npx -y playwright-e2e-mcp doctor    # checks Node, Playwright, browsers, client setup and updates

Then restart your client and ask:

Run my Playwright tests and fix whatever fails.

Or let your agent install it. Paste this into any coding agent:

Install the playwright-e2e-mcp server and skill by following https://raw.githubusercontent.com/xsignon-secure/E2E/main/llms-install.md

Or add the standard config by hand (works in most clients):

{
  "mcpServers": {
    "playwright-e2e": {
      "command": "npx",
      "args": ["-y", "playwright-e2e-mcp"]
    }
  }
}

Needs: Node.js 22+, and a project with @playwright/test and a browser (npx playwright install chromium) or with pytest-playwright. The server uses its working directory as the project root; if your client starts it elsewhere, add "env": { "PW_MCP_PROJECT_ROOT": "/path/to/your/project" }.

/plugin marketplace add xsignon-secure/E2E
/plugin install playwright-e2e-mcp@xsignon-secure

claude mcp add playwright-e2e -- npx -y playwright-e2e-mcp

code --add-mcp '{"name":"playwright-e2e","command":"npx","args":["-y","playwright-e2e-mcp"]}'

codex mcp add playwright-e2e -- npx -y playwright-e2e-mcp

[mcp_servers.playwright-e2e]
command = "npx"
args = ["-y", "playwright-e2e-mcp"]
startup_timeout_sec = 60
tool_timeout_sec = 600

gemini extensions install https://github.com/xsignon-secure/E2E

💬 What you can ask

✨ What you get

🩺 A fix loop that proves itself

• Fixes are verified, not guessed. suggest-fix picks a locator proven unique on the DOM at failure, writes it, re-runs the test and reverts if it's still red. Strict-mode violations get the locator of the intended match; changed copy gets the new expected text.
• Honest about real bugs. When the element is really gone, it refuses to patch the test and reports an app bug.
• Heal guard. check-test-change (and playwright-e2e-mcp guard in CI) blocks a "fix" that went green by deleting an assertion, skipping the test, adding .only, swallowing the error or moving an assertion under an if, and warns on weaker matchers, hard waits, forced clicks, early returns and raised timeouts. runtime: true also runs the old and new version and blocks a test that now executes fewer assertions, which catches what no code scan can. Works for pytest-playwright files too.
• Asks before it writes. Applying a fix, writing a test, quarantining or replacing a visual baseline shows you the exact diff and waits for your yes in clients that support MCP questions (PW_MCP_CONFIRM_WRITES).

🔬 Flaky tests, history and the breaking commit

• Flaky verdicts with evidence. diagnose-flaky tells a race from shared state from a test-order dependency, and gives the seed that replays it.
• Quarantine with an owner and an expiry. The test keeps running and being reported; it stops blocking the build until the date you set.
• Memory of every run. analyze-history ranks flaky, regressed, broken and slow tests and names the commit where each went bad. Share one history across every CI job and laptop with the free, self-hosted history server (one docker run, dashboard included).
• bisect-failure finds the first bad commit without touching your checkout.
• audit-tests finds flake risks in the test code (hard waits, one-shot assertions, missing awaits, fragile selectors, clicks right after goto on a server-rendered app), ranks them by real flakiness and applies the safe rewrites with a verifying run.

⚡ Hydration races and stale mocks

• The "too fast" click. On Next.js, Nuxt, Remix, Astro and other server-rendered apps the HTML is clickable before JavaScript attaches its handlers, so a test clicks, the step passes and nothing happens. inspect-page names the framework and measures how long controls were on screen before hydration; get-failure and diagnose-flaky flag a click made while the page's scripts were still downloading and hydration errors in the console; each comes with the wait to add.
• Mocks that drifted from the API. check-mocks (and playwright-e2e-mcp mocks in CI) finds every route.fulfill JSON body and routeFromHAR recording, calls the real endpoint (GET only) and reports the fields the mock relies on that the API no longer sends, changed types, new nulls and removed endpoints, so a green suite stops hiding a broken contract.

🔗 CI runs by URL, remote browsers, Python fixes and AI chat UIs

• Paste the CI run, skip the download. Give load-report a GitHub Actions run or GitLab job URL. It fetches the report and traces with your own GITHUB_TOKEN / GITLAB_TOKEN, maps them onto your checkout, and get-failure and suggest-fix work on that run.

  { "report": "https://github.com/acme/shop/actions/runs/123456789" }
  

• Any browser, anywhere. The page tools take connect: a Playwright server (npx playwright run-server), a browser grid or device cloud, or a Chrome over CDP. Keys stay in the environment as {{env:…}}, never in chat, and only go to hosts you named in PW_MCP_CONNECT or PW_MCP_CONNECT_HOSTS.

  { "url": "https://staging.example.com", "connect": "wss://grid.example.com/playwright?key={{env:E2E_GRID_KEY}}" }
  

• Fixes for pytest suites. suggest-fix now patches test_*.py files in Python syntax and re-runs the test with pytest before keeping the change:

  - page.get_by_test_id("checkout-button").click()
  + page.get_by_role("button", name="Checkout").click()
  

• AI chat and streaming UIs. The agent skill shows how to test answers that stream in: mock the model's stream, wait for the "done" signal instead of the text, and check shape rather than exact wording against a live model.

  await expect(page.getByRole('button', { name: 'Stop' })).toBeHidden();
  await expect(page.getByTestId('message').last()).toHaveText('Hello, world!');
  

🤖 CI that comments with working fixes

• GitHub Action that writes the diagnosis to the job summary, keeps one PR comment up to date and posts each verified fix as a suggested change reviewers apply with one click.
• CI templates for GitHub Actions, GitLab, Azure DevOps, CircleCI, Bitbucket and AWS CodeBuild, and a plain ci command for anything else.
• Diagnose CI locally: load-report maps a CI job's report and traces onto your checkout.

🌐 Page tools with locators that already work

• inspect-page returns a compact map of verified Playwright locators (about 570 tokens for a storefront page, against 2,300 for a Playwright MCP snapshot), or the full DOM inventory, or the accessibility snapshot with a ready toMatchAriaSnapshot assertion.
• Reaches the hard screens: saved logins, headers, click and fill steps, popups and new tabs, API mocks (500s, empty lists, slow calls), HAR record and replay, phone and tablet presets, Chromium, Firefox, WebKit, Chrome and Edge.
• Look without changing anything: blockWrites stops POST, PUT, PATCH and DELETE requests from reaching a real backend, and blockResources skips images, fonts and trackers for faster, private page checks. offline: true cuts the network after load to test offline states.
• Accessibility, Web Vitals and visual diffs that return locators and ready tests, not just a score.

🚀 Built for agents in 2026

• Lean on context. Start with --tools=auto (about 2.4k tokens of tool definitions instead of 12.1k) and the agent loads the page, audit or history tools when it needs them, or pick a profile: core, triage, inspect, author.
• Interactive test report in MCP Apps clients (Claude, ChatGPT, Cursor): filter failures, see expected vs. received, re-run or "Ask to fix" in one click.
• Current MCP: the stateless 2026-07-28 revision (2025 clients still work), structured results with output schemas, tool annotations for accurate safety prompts, the skill served over the Skills extension, and a Server Card for discovery.
• Everywhere you work: npm, Claude Code plugin, Claude Desktop bundle, Gemini CLI extension, Docker image on GHCR, and an HTTP bridge with OAuth for remote-only clients.

🧰 Tools

With --tools=auto, a load-tools tool turns on more tools mid-session. Two prompts, fix-failing-test and triage-flaky-tests, package the main workflows as slash commands. Every argument and example output is in the tool reference.

🤖 CI: GitHub Action, GitLab and any CI

The same diagnosis runs without an agent. On a pull request the Action re-runs each failing test with its suggested fix and posts the fixes that pass as suggested changes on the failing lines, so a reviewer applies one with the Commit suggestion button:

permissions:
  contents: read
  pull-requests: write   # for the PR comment and the suggested fixes
steps:
  - uses: actions/checkout@v6
  - uses: actions/setup-node@v6
    with: { node-version: 24 }
  - run: npm ci && npx playwright install --with-deps chromium
  - uses: xsignon-secure/E2E@v0.15.0
    with:
      flaky-runs: 3      # 0 skips the flaky verdict
      suggest: 2         # suggest-fix diffs for the first 2 failures
      # guard: true      # fail the job if a test was made to pass by checking less

• Ready-to-copy workflows: GitHub Actions (artifact upload, heal guard, history server), GitLab CI (heal guard on merge requests and a merge request comment), Azure DevOps, CircleCI, Bitbucket Pipelines and AWS CodeBuild (heal guard on pull requests, reports as artifacts).
• Any other CI (Jenkins, Buildkite, TeamCity): npx -y playwright-e2e-mcp ci --flaky-runs 3 --suggest 2 --output report.md. Exit code 0 passed, 1 tests failed, 2 the run itself failed. Quarantined, unexpired failures don't fail it.
• Heal guard without the Action: npx -y playwright-e2e-mcp guard --base origin/main (exit 1 on BLOCK; --strict fails on warnings too).
• Mock drift check: npx -y playwright-e2e-mcp mocks --base-url https://staging.example.com against a preview or staging deploy (exit 1 on drift; --map gives wildcard routes a real URL, --header "Authorization: Bearer $TOKEN" signs the calls).
• Team history across machines: run the free history server and give the Action history-url and history-token; every CI run lands in one history that analyze-history on your laptop and the server's dashboard both read.

Action inputs: project-root, args, flaky-runs, suggest, comment, review, verify-fixes, guard, history-token, history-url, fail-on-failure, version, github-token. Outputs: exit-code, report, guard.

🐍 Python projects (pytest-playwright)

When the project has no Node Playwright but has pytest settings (pytest.ini, pyproject.toml, setup.cfg, tox.ini) or a conftest.py, the tools run python -m pytest instead.

pip install pytest-playwright && playwright install chromium

⚙️ Configuration

Pick your tools. --tools= (or PW_MCP_TOOLS) takes profiles and tool names: auto (core loop plus load-tools, about 2.4k tokens), core (the seven-tool fix loop, about 2.3k), triage, inspect, author, or all twenty (about 12.1k, the default).

📊 Benchmark

bench/token-benchmark.mjs breaks a checkout button's test id on a storefront page and fixes it two ways: with this server (run-test → suggest-fix → apply) and with Playwright MCP plus a shell (playwright test, browser_navigate + browser_snapshot, edit, re-run). Latest result (full output):

Tokens are characters ÷ 4 and count what the model reads (each tool's name, description and input schema). Tool definitions are sent with every request, so with all 20 tools loaded they outweigh the saving on the work itself: use --tools=core when you only fix failing tests, or --tools=auto to start at 2,427 tokens and load more on request. The Playwright MCP route is a lower bound: it assumes the agent picks the right locator from the snapshot on the first try, which the server does for it here. Run 2026-11-01 with Playwright 1.64.1; re-run with npm run build && node bench/token-benchmark.mjs.

🤝 Works alongside your browser MCP

Microsoft's Playwright MCP, Chrome DevTools MCP and similar servers are great for driving a page step by step. This server doesn't replace them or Playwright's own Test Agents in VS Code. Use a browser MCP to explore, and this one to run, diagnose and fix the suite, with fixes that are verified, a guard against fixes that cheat, flaky verdicts with evidence and the commit that broke a test.

💚 Free and open source

• MIT licensed. Use it, change it, ship it in commercial work. No paid tier, no feature held back, including the team history server, which you host yourself.
• No account, no API key, no sign-up. npx -y playwright-e2e-mcp init is the whole setup.
• No telemetry. It never phones home. Your tests, traces and run history stay on your machine unless you point it at your own history server. The only other requests are doctor asking npm for the latest version number when you run it (--offline skips it), load-report downloading a CI run's artifacts when you give it a run URL, and a remote browser you name with connect.
• Free dependencies only: the MCP SDK (Apache-2.0), zod (MIT), axe-core (MPL-2.0) and playwright-core (Apache-2.0). Test runs use the Playwright your project already has.

🆕 Recent releases

• 0.15: pytest-playwright suites get diagnose-flaky (with pytest-xdist for isolate), audit-tests (Python flake rules and expect(...) rewrites) and generate-e2e-test (writes and verifies test_*.py). -n runs no longer count each pytest result twice.
• 0.14.1: security fix: behind a reverse proxy the sign-in limit can no longer be dodged with a forged X-Forwarded-For; {{env:…}} secrets in an agent-chosen connect URL only go to hosts you named. CI templates for Azure DevOps, CircleCI, Bitbucket and AWS CodeBuild, and check-mocks reads JSON bodies written as strings (body='{"id": 1}').
• 0.14: run-test changed: true (only tests affected by your changes), suggest-fix verifyAllProjects (keep a fix only if every browser passes), mask for dynamic regions in compare-visual-state, blockResources and offline for page tools, and a guard when the server starts in your home folder.
• 0.13.1: security fix: load-report only sends GITHUB_TOKEN / GITLAB_TOKEN to github.com, gitlab.com and hosts in PW_MCP_CI_HOSTS, never along a redirect. Page tools and suggest-fix now work in pytest projects installed from npm or Docker (the server ships playwright-core).
• 0.13: load-report takes a GitHub Actions or GitLab run URL, remote browsers and device clouds with connect, suggest-fix patches pytest files, guidance for testing AI chat and streaming UIs.
• 0.12: hydration-race detection, check-mocks for mocks that drifted from the API, heal guard that checks at run time and reads pytest files.
• 0.11: compact inspect-page (571 tokens instead of 3,600), --tools=auto to load tools on request, smaller tool definitions.
• 0.10: asks before changing your files, interactive test report in MCP Apps clients, Client ID Metadata Document sign-in for the hosted endpoint.
• 0.9: the team history server is free, self-hosted and in this repo.
• 0.8: pytest-playwright suites, popups and new tabs, blockWrites, MCP 2026-07-28, update check in doctor.
• 0.7: saved logins with 2FA, heal guard, flaky-test quarantine.

All release notes

📚 More documentation

• Tool reference: every argument, example outputs, edge cases handled
• Hosted endpoint: the HTTP bridge for ChatGPT and claude.ai connectors
• History server: shared CI run history with a dashboard, self-hosted
• Architecture: how the server is built and the design decisions behind it
• Security: the security model and how to report a vulnerability
• Development: building, tests, Docker, signing and releasing

🙌 Contributing

Issues, ideas and pull requests are welcome. Start with a good first issue, read CONTRIBUTING.md and the code of conduct.

License

MIT. If this saves you a debugging session, a ⭐ on the repo helps other Playwright users find it.