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mcp-test-runner

mcp
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SUMMARY

MCP server driving pytest / Jest / Cypress / Go / Maestro — analyze, generate, run, advise. Web + Mobile (iOS/Android/BlueStacks).

README.md

MCP Test Runner

English · 繁體中文

PyPI
License: MIT
Buy Me a Coffee

Universal MCP server for running tests across pytest / Jest / Cypress / Go,
with built-in DOM analyzer, run history, and a self-improvement coach.

A Model Context Protocol server that lets Claude Desktop / Cursor / any
MCP client drive your test suite end-to-end: run tests, inspect failures
(screenshot + video + trace), analyze a live URL to draft test cases, and —
after each run — produce a prioritized action plan telling you exactly what
to fix or write next.

QA_RUNNER Framework Language Target
pytest / pytest-playwright / playwright pytest + Playwright Python Web
jest Jest JavaScript Web
cypress Cypress JavaScript Web
go / go-test go test Go Backend
maestro / mobile Maestro YAML iOS + Android

Full design notes: docs/framework.md.

What's in the box

  • Run tests across multiple frameworks (web + mobile) via a single MCP surface
  • Mobile via Maestro (since v0.3.0): same MCP tools, iOS Simulator /
    Android Emulator / real device; YAML flows; cross-platform without rewrites
  • Failure artifacts: screenshot (base64-inlined), video, Playwright
    trace.zip / Maestro recordings
  • Run history: every run snapshotted; HTML report shows a sparkline trend
  • DOM / Screen analyzer — analyze_url for web (forms / nav / dialogs /
    CTAs + the API endpoints the page hits) and analyze_screen for mobile
    (maestro hierarchy → form / cta / tab_bar modules)
  • Smart test generation (generate_test): hand it an analyzer module
    and it writes a runnable Playwright .py or Maestro .yaml with concrete
    selectors, not # TODO stubs
  • Auto-retry flakes — pytest side via pytest-rerunfailures; Maestro
    side via custom retry wrapper (no native --reruns); flaky tests
    surfaced separately from real failures
  • Self-improvement coach (get_optimization_plan): post-run analysis
    across three lenses — suite quality, MCP usability, AI generation effectiveness
  • JUnit XML output for CI integrations (GitHub Actions / Jenkins / GitLab)

Install

Two paths — pick the one that matches how you'll use it.

A. Run via uvx (zero install, recommended for end users)

Add mcp-test-runner to your client config without installing anything globally; uv fetches and runs it in an ephemeral environment per session:

{
  "mcpServers": {
    "mcp-test-runner": {
      "command": "uvx",
      "args": ["mcp-test-runner"],
      "env": { "QA_RUNNER": "pytest", "QA_PROJECT_ROOT": "/path/to/your-test-project" }
    }
  }
}

That's the whole setup. First call downloads the package; subsequent calls are cached. Switching versions: uvx [email protected] ....

B. Install into a project venv (for contributors / hacking)

pip install mcp-test-runner       # or: pip install -e . from a clone
playwright install                # only if you use pytest-playwright
pip install pytest-rerunfailures  # optional, enables auto-retry

Then point your client config at the same Python interpreter:

"command": "/path/to/.venv/bin/python",
"args": ["-m", "mcp_test_runner.server"]

Runner-specific prerequisites

QA_RUNNER You also need
pytest / pytest-playwright pip install pytest-playwright + playwright install chromium
jest A Node project with jest installed (npm i -D jest)
cypress A Node project with cypress installed (npm i -D cypress)
go Go toolchain on PATH
maestro Maestro CLI + a booted simulator / emulator / device (or BlueStacks reachable via adb connect)

Wire into Claude Desktop

Copy examples/configs/claude_desktop_config.example.json to:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
  • Windows: %APPDATA%\Claude\claude_desktop_config.json

Two environment variables drive the runtime:

Variable Example What it does
QA_RUNNER pytest / jest / cypress / go / maestro Selects which test framework
QA_PROJECT_ROOT /path/to/your/project Points at the project under test
QA_ANDROID_HOST (optional) 127.0.0.1:5555 Remote-ADB endpoint for BlueStacks / Genymotion / Nox / cloud Android. When set, the Maestro runner auto-runs adb connect <host> before each test / analyze_screen call. Requires adb on PATH.
QA_TIMEOUT_SECONDS (optional) 600 (default) Hard ceiling on any single subprocess invocation (pytest / jest / cypress / go test / maestro). Returns exit_code=124 with a [TIMEOUT…] tag in stderr when exceeded, so the AI client can react cleanly instead of hanging the MCP server forever.

Per-runner snippet

pytest-playwright:

"env": { "QA_RUNNER": "pytest", "QA_PROJECT_ROOT": "/path/to/python-project" }

Jest:

"env": { "QA_RUNNER": "jest", "QA_PROJECT_ROOT": "/path/to/node-project" }

Cypress:

"env": { "QA_RUNNER": "cypress", "QA_PROJECT_ROOT": "/path/to/cypress-project" }

Go test:

"env": { "QA_RUNNER": "go", "QA_PROJECT_ROOT": "/path/to/go-project" }

Other MCP clients

MCP is an open protocol — this server isn't Claude-only. The same Python
process talks to any MCP client over JSON-RPC stdio. What differs across
clients is (1) the config file format and (2) how reliably the underlying
model auto-chains tool calls.

Client Config Format Model Tool-chain quality
Claude Desktop / Cursor ~/Library/Application Support/Claude/...json · ~/.cursor/mcp.json JSON Claude Opus / Sonnet Best tested
Codex CLI ~/.codex/config.toml TOML GPT-5 family Strong (well-trained on tool chaining)
Gemini CLI ~/.gemini/settings.json JSON Gemini 3.1 Pro / Flash Works; prefers explicit prompts ("first analyze, then write")
Cline / Continue / Zed each has its own MCP config slot varies varies depends on configured model

Example configs ship in the repo:
codex-config.example.toml ·
gemini-config.example.json ·
claude_desktop_config.example.json.

Codex (TOML):

[mcp_servers.mcp-test-runner]
command = "/path/to/.venv/bin/python"
args = ["-m", "mcp_test_runner.server"]
cwd = "/path/to/mcp-test-runner"
[mcp_servers.mcp-test-runner.env]
QA_RUNNER = "pytest"
QA_PROJECT_ROOT = "/path/to/your-test-project"

Gemini (JSON, same shape as Claude Desktop):

{
  "mcpServers": {
    "mcp-test-runner": {
      "command": "/path/to/.venv/bin/python",
      "args": ["-m", "mcp_test_runner.server"],
      "cwd": "/path/to/mcp-test-runner",
      "env": {
        "QA_RUNNER": "pytest",
        "QA_PROJECT_ROOT": "/path/to/your-test-project"
      }
    }
  }
}

Tool descriptions already nudge the recommended chains
(analyze_url → generate_test, get_qa_context before generating
domain tests). Clients with weaker tool-selection benefit most from
explicit prompts that name the steps.

Tool surface

Shared across all runners (some tools degrade gracefully on non-pytest runners):

Tool Purpose
get_runner_info Which runner is active + all available ones
list_tests Enumerate tests in the project
run_tests Run tests (filter / headed / browser; last two pytest-playwright only)
run_failed Re-run last failures (pytest --lf)
get_test_report Summary (pass / fail / skipped / duration / flaky-in-run)
get_failure_details Per-failure message + screenshot / trace / video paths
generate_test Test skeleton; with module from analyze_url/analyze_screen, a runnable one (Playwright .py or Maestro .yaml)
auto_generate_tests One-shot: analyze URL → generate one test per discovered module
codegen Launch Playwright codegen (web) / hint to maestro studio (mobile)
generate_html_report Render the latest run as self-contained HTML
get_test_history Last N archived run summaries (for trend / flake debugging)
analyze_url Web: DOM probe → modules + selectors + candidate TCs + API endpoints + layout overflow warnings
analyze_screen Mobile: maestro hierarchy → form / cta / tab_bar modules + candidate TCs (noise-filtered)
init_qa_knowledge / get_qa_context Scaffold + read the project's QA knowledge layer (methodology + domain)
get_optimization_plan Three-layer self-improvement coach (suite / MCP / AI strategy)

Resources

URI What
report://html Live-rendered HTML report (dark mode, self-contained)
report://json Raw pytest-json-report JSON
report://optimization Latest optimization-plan.md

Self-improvement loop

After every run, _archive_report() snapshots report.json into
test-results/history/ and writes a fresh optimization-plan.md covering:

  1. Suite quality — outcomes string per test (PFPFP); transitions → flake
    score; 3+ identical-signature fails → broken; rerun-passed → flaky-in-run
  2. MCP usability — top tools, error rates, repeat-arg patterns, common
    A→B chains (from telemetry JSONL logs)
  3. AI strategy — adoption rate of generate_test outputs, coverage gaps
    from analyze_url modules with no matching test files

The plan emits prioritized actions (high / medium / low) each with
target + evidence + suggestion + optional auto_action_hint the MCP client
can chain into the next tool call.

Project layout

mcp-test-runner/
├── pyproject.toml
├── src/mcp_test_runner/
│   ├── server.py            # MCP entry (tool routing + telemetry wrap)
│   ├── config.py            # Paths + env vars
│   ├── runners/             # Per-framework plugins
│   │   ├── base.py          # TestRunner abstract interface
│   │   ├── pytest_playwright.py
│   │   ├── jest.py
│   │   ├── cypress.py
│   │   └── go_test.py
│   ├── reporters/
│   │   └── html.py          # Self-contained HTML render
│   └── tools/               # Thin shims + analyzer + optimizer + telemetry
└── tests_project/           # Example project under test

Adding a runner

  1. Create src/mcp_test_runner/runners/your_runner.py, subclass TestRunner,
    implement the abstract methods
  2. Register the name in runners/__init__.py's REGISTRY
  3. Done

End-to-end workflow

The intended pipeline — from a URL to "what should I improve next time":

flowchart LR
    URL[URL] -->|analyze_url| MOD[modules<br/>+ candidate TCs<br/>+ API endpoints]
    MOD -->|generate_test<br/>module=...| TEST[tests/test_*.py<br/>runnable skeleton]
    TEST -->|run_tests| RES[report.json<br/>+ screenshots<br/>+ trace.zip<br/>+ junit.xml]
    RES -->|auto archive| HIST[history/ snapshot]
    RES -->|generate_html_report| HTML[HTML report<br/>self-contained]
    HIST -->|auto write| PLAN[optimization-plan.md]
    PLAN -.->|next session reads| URL

The loop is the point: every run feeds the optimizer, the optimizer
points at the weakest link, the next run hits that link first.

Walkthrough — testing a login page

In a Claude / Cursor session:

You: 分析 https://shop.example/login，幫我寫對應測試

Claude: [analyze_url] Found 1 form (email_password_form_0) + 3 API
endpoints. 5 candidate TCs.
[generate_test with the form module] Wrote tests/test_login.py —
runnable with concrete selectors, no # TODO stubs.

You: 跑

Claude: [run_tests] 23 passed, 0 failed in 31s. Screenshots + step
traces captured for every test.

You: 下一步該做什麼？

Claude: [opens report://optimization]
Top: tests/test_login.py::test_invalid_credentials is flaky
(flake_score=0.4, outcomes=PFPFP). Suggestion: add
wait_for_response('/api/login') before asserting the error message.

The three optimizer lenses (suite quality / MCP usability / AI generation
effectiveness) make every "下一步" answer data-driven, not gut feel.

Walkthrough — testing a mobile app (Maestro)

Same shape, different runner. Requires Maestro CLI installed +
simulator/emulator booted + your app launched (or pass launch_app=true
with app_id):

You: 分析 your mobile app 首頁的條碼按鈕、寫對應測試

Claude: [analyze_screen(app_id="com.example.app", launch_app=true)]
Found 15 interactive elements; matched barcode_button
(text="條碼", resource_id="barcodeButton") + candidate TCs.
[generate_test with the cta module] Wrote maestro-flows/test_barcode.yaml —
tapOn: { id: barcodeButton } + waitForAnimationToEnd + takeScreenshot,
ready to maestro test.

You: 跑

Claude: [run_tests] 5 flows pass, retry didn't fire. Screenshots
embedded in HTML report.

You: 上面這個按鈕有時候會 fail、為什麼？

Claude: [get_optimization_plan] barcode_button::barcode_button flagged
flaky (flake_score=0.4, outcomes=PFPFP, rerun_count=1). Suggestion: 加
waitForAnimationToEnd 或 extendedWaitUntil 等動畫穩定後再 tap。

Mobile-specific notes:

  • The same qa-knowledge.md (built-in methodology + your domain) feeds
    both web and mobile runs — write your business rules once.
  • analyze_screen filters out iOS status bar (signal / wifi / battery)
    and asset-name labels (bg_*, *_filled); the result is signal-heavy.
  • Maestro's takeScreenshot: <name> directive controls which screens
    show up as inline images in the HTML report.

Prompting cookbook

Each row shows a phrase you can paste into a Claude / Cursor session and
the underlying MCP tool call it should trigger. Use as a reference for
"how do I get the AI to do X without naming the tool myself."

One-time setup

You say Claude calls
"Initialize the QA knowledge file." init_qa_knowledge → writes qa-knowledge.md to your project root
"Show me the current QA knowledge." get_qa_context → methodology + your domain sections
"Open the ISTQB principles section." get_qa_context(section="ISTQB")

Day-to-day testing

You say Claude calls
"Run all tests." run_tests
"Run only login-related tests." run_tests(filter="login")
"Re-run just the failures." run_failed
"Show me the summary." get_test_report
"Which ones failed? Give me screenshots and trace." get_failure_details
"Generate the HTML report." generate_html_report

Building tests from a URL (web)

You say Claude calls
"Auto-generate tests for https://shop.example/." auto_generate_tests(url=...) — one-shot
"Analyze https://shop.example/coupon first, then write one test per module." analyze_url → generate_test × N
"Analyze coupon page and write a regression test for our past idempotency bug." get_qa_context(section="Bug") → analyze_url → generate_test(business_context=...)
"Just record a checkout flow as a baseline." codegen(url=...)

Building tests from a mobile screen (Maestro)

Requires QA_RUNNER=maestro, Maestro CLI, and a booted simulator/emulator/device.

You say Claude calls
"Analyze the current your mobile app screen and write a test for the barcode button." analyze_screen(app_id="com.example.app", launch_app=true) → generate_test(module=<cta>)
"Test the login form on this app." analyze_screen(launch_app=true) → pick form module → generate_test
"Cover the tab bar — write one flow per tab." analyze_screen → take the tab_bar module → generate_test
"Use Maestro Studio to record a flow." codegen(url=...) returns a hint pointing at maestro studio (record + save manually)

BlueStacks / remote Android instances: set QA_ANDROID_HOST=127.0.0.1:5555
(or whatever host:port BlueStacks exposes — see Settings → Advanced → Android
Debug Bridge). The Maestro runner will adb connect before each test and
analyze_screen, and bumps the hierarchy timeout to 60s to absorb the
slower TCP-ADB path. Genymotion / Nox / LDPlayer / WSA work the same way;
any host:port that responds to adb connect is fine.

Continuous improvement

You say Claude calls
"What should I fix next?" get_optimization_plan
"Has test_login_invalid been flaky lately?" get_test_history + plan lookup
"Why did it fail? Show me the trace." get_failure_details (returns screenshot/trace/video paths)

Tips — getting Claude to pick the right tool

  • Mention QA knowledge explicitly — "reference qa knowledge when testing coupon" pushes Claude to call get_qa_context first; saying just "test coupon" may skip it.
  • State the order — "analyze first, then write" forces analyze_url before generate_test; "just write a test for X" skips analysis.
  • Batch vs precise — "auto-generate the whole page" → auto_generate_tests; "write one test per candidate_tc" → manual chain.
  • Failure debugging — Asking "why did it fail / show me the screenshot" reliably triggers get_failure_details (which now returns screenshot + trace + video paths).

Anti-patterns

  • ❌ "Run it 5 times to see if it's flaky" — the runner has auto-retry + history; just ask "is it flaky" and let get_optimization_plan answer.
  • ❌ "Generate 100 tests" — noise > signal. Use get_optimization_plan first to find what's missing.
  • ❌ "Test all edge cases" — too vague. Phrase as "test every candidate_tc for this form" — concrete, bounded, traceable.

Sample outputs

analyze_url (excerpt)

{
  "url": "https://shop.example/login",
  "page_title": "Login",
  "module_count": 3,
  "modules": [
    {
      "kind": "form",
      "name": "email_password_form_0",
      "selectors": {
        "container": "#login",
        "fields": [
          {"label": "Email", "selector": "#email", "type": "email", "required": true},
          {"label": "Password", "selector": "#password", "type": "password", "required": true}
        ],
        "submit": "button[type='submit']"
      },
      "candidate_tcs": [
        "所有必填欄位為空時送出，應顯示必填錯誤",
        "Email 欄位填入格式錯誤的字串（無 @），應顯示格式錯誤",
        "Password 欄位輸入後應預設遮蔽（type=password）",
        "全部填入合法值後送出，應觸發成功流程"
      ]
    }
  ],
  "api_endpoints": [
    {
      "method": "POST",
      "path": "/api/login",
      "status": 401,
      "candidate_tcs": [
        "POST /api/login payload 缺必填欄位應回 400 + 欄位錯誤訊息",
        "POST /api/login 合法 payload 應回 2xx",
        "POST /api/login 缺少 auth header 應回 401/403"
      ]
    }
  ]
}

generate_test output (smart, with module)

"""
Login happy path

Auto-generated from analyze_url module: email_password_form_0 (kind=form)
"""
from playwright.sync_api import Page, expect


def test_login(page: Page):
    page.goto('https://shop.example/login')
    page.locator('#email').fill('[email protected]')
    page.locator('#password').fill('TestPass123!')
    page.locator("button[type='submit']").click()
    # TC: Email 欄位填入格式錯誤的字串（無 @），應顯示格式錯誤
    # TC: Password 欄位輸入後應預設遮蔽
    # TC: 正確 Email + 正確密碼 → 導向 dashboard
    # TODO: 補上實際斷言，例如：
    # expect(page).to_have_url(...)
    # expect(page.get_by_text("成功")).to_be_visible()

optimization-plan.md (excerpt)

# Optimization Plan — 2026-05-12T14:03:40

_Based on 6 archived runs._

## Prioritized Actions

### 1. 🔴 HIGH — flaky
- **Target**: `tests/test_login.py::test_invalid_credentials`
- **Evidence**: flake_score=0.4, outcomes=PFPFP, rerun_count=1
- **Suggestion**: 加 explicit wait（wait_for_response / locator wait）

### 2. 🟡 MEDIUM — coverage_gap
- **Target**: `register_form`
- **Evidence**: 由 analyze_url 偵測但 repo 內找不到對應 test_*.py
- **Suggestion**: `call generate_test(description="...", filename="test_register_form.py")`

HTML report

Open the live rendered demo →
(served via GitHub Pages — clicking the link in GitHub's UI to
sample_report.html would only show source).

The demo shows the stats grid, trend sparkline, failure cards with embedded
screenshots + step lists, and the collapsed Passed section.

Integrations

mcp-test-runner doesn't bundle third-party SDKs — it stays a pure
test-execution + analysis layer. Real QA workflows are composed by
running multiple MCP servers side-by-side in the same client config;
Claude orchestrates the chain across servers. There's no MCP-to-MCP
RPC — each server is independent, the AI client is the conductor.

The pairings below are the ones that complete the loop most often:

Pair with Why Example chain
Atlassian MCP (JIRA + Confluence) Auto-open bug tickets from failures; sync optimization-plan.md to a team Confluence page run_tests → get_failure_details → atlassian.createJiraIssue (attaches screenshot + trace path)
Slack MCP Notify channels on failure, share the rendered HTML report, mention oncall for flaky tests generate_html_report → slack.send_message(channel="#qa-bots", attachments=...)
GitHub MCP Read PR description / linked issues for business context before generating tests; post results back as PR comments github.get_pull_request → analyze_url → generate_test(business_context=PR body) → github.create_issue_comment
Sentry MCP Production errors drive regression priority: top crashes → matching regression tests sentry.list_issues(sort="frequency") → generate_test(business_context=stack trace) → run_tests
Filesystem MCP Read a shared qa-knowledge.md or TC source files that live outside QA_PROJECT_ROOT (monorepos, multi-project setups) filesystem.read_file("~/shared/qa-knowledge.md") → init_qa_knowledge

Honorable mention — Google Drive MCP: pairs with Google-Sheet-based TC management (read TCs from a sheet → generate_test → write status back).

Composing in your client config

All five run as separate processes alongside mcp-test-runner:

{
  "mcpServers": {
    "mcp-test-runner": { "command": "python", "args": ["-m", "mcp_test_runner.server"], "env": { "QA_RUNNER": "maestro" } },
    "atlassian":       { "command": "npx", "args": ["-y", "@atlassian/mcp"] },
    "slack":           { "command": "npx", "args": ["-y", "@modelcontextprotocol/server-slack"] },
    "github":          { "command": "npx", "args": ["-y", "@modelcontextprotocol/server-github"] }
  }
}

Then a single prompt walks the chain:

"Run the checkout suite. For each failure, open a JIRA in project QA with the RIDER format and the screenshot attached. Post the HTML report to #qa-bots when done."

Why this matters: mcp-test-runner stays focused on the test loop
(analyze → generate → run → coach). JIRA / Slack / Sentry are entire
domains with their own dedicated servers — bolting them into this one
would dilute the scope, duplicate auth handling, and force every user
to inherit dependencies they may not want.

本 repo 不打包任何第三方 SDK——維持「測試執行 + 分析」單一職責。實務上 QA 工作流是多個 MCP server 並存、由 Claude 編排跨 server 的 tool chain達成的。範例配套：JIRA / Slack / GitHub / Sentry / Filesystem 各自獨立 MCP server，配上 mcp-test-runner 拼出完整測試管線。

Publishing (maintainer-only)

Releases ship to PyPI via Trusted Publishing — no API tokens stored in the repo. The flow:

  1. Bump version = "x.y.z" in pyproject.toml (via a normal PR — main is branch-protected).
  2. After merge, tag main and push:
    git tag -a vX.Y.Z -m "vX.Y.Z — short summary"
git push origin vX.Y.Z
  3. Create a GitHub Release for that tag (gh release create vX.Y.Z ...).
  4. The release event fires .github/workflows/publish.yml → builds sdist + wheel → uploads to PyPI.

One-time PyPI setup (must be done once before the first publish works):

  • Sign in at https://pypi.org → enable 2FA.
  • Project page → Settings → Publishing → add a pending publisher with:
    • Owner: kao273183
    • Repository: mcp-test-runner
    • Workflow filename: publish.yml
    • Environment name: pypi

After the first successful run, PyPI auto-promotes the pending publisher to a trusted one and subsequent releases authenticate via OIDC.

The workflow refuses to publish if the release tag doesn't match pyproject.version, which catches "tagged but forgot to bump" mistakes before they hit PyPI.

Support the project ☕

mcp-test-runner is built and maintained solo on nights and weekends. If it saved you time or shaped how your team thinks about AI-driven QA, a coffee keeps the late-night Maestro debugging sessions going:

Buy Me a Coffee

Your support funds: keeping this repo free + actively maintained, more device variants for Maestro testing (real iPhones / Android tablets / BlueStacks), recorded tutorials for the QA community, and the next 2am bug hunt.

No ads, no sponsorships, no enterprise upsell — just the work.

Contributing

This repo is maintained solo. Ideas and bug reports are very welcome — please open an Issue or start a Discussion. I read every one and will implement what fits the project's direction.

External pull requests are auto-closed. Not because contributions aren't appreciated, but because keeping the codebase coherent under a single voice matters more here than the throughput a multi-contributor model would bring. If you really want a specific change, an Issue describing the problem gets you further than a PR.

本 repo 由我一人維護。歡迎透過 Issue / Discussion 提想法或回報問題，我會親自評估並實作。外部 PR 會自動關閉——不是不歡迎貢獻，而是想保持程式碼風格與走向一致。

License

MIT © 2026 Jack Kao — see LICENSE
(中文翻譯參考: LICENSE.zh-TW.md; the English version is
authoritative).

In plain English: you can use this for anything (personal projects, commercial
work, modifications, redistribution). The only ask is that you keep the
copyright + license notice in any copy you ship. There's no warranty — use
at your own risk.

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