A
licenseB
qualityD
maintenanceSupercharges AI-assisted debugging of Playwright tests by parsing trace files to extract failures, action history, network logs, screenshots, and suggesting fixes.
6
0MIT
Playwright Report MCP
by nora-weisser
Playwright Report MCP
Un servidor MCP que expone los informes de pruebas JSON de Playwright como herramientas para agentes de LLM.
Requisitos
Python >= 3.10
uv (
brew install uvocurl -LsSf https://astral.sh/uv/install.sh | sh)Node.js + npx — solo para
mcp dev, que inicia el MCP Inspector
Related MCP server: QA Copilot MCP Server
1. Instalar dependencias
Desde la raíz del repositorio:
uv syncEsto crea .venv/ e instala el proyecto en modo editable. Todos los comandos siguientes se ejecutan mediante uv run, por lo que nunca necesitas activar el venv manualmente.
2. Generar un informe JSON de Playwright
El servidor lee un informe de Playwright generado por el reportero json. En tu proyecto de Playwright:
npx playwright test --reporter=json > results.jsonO configúralo permanentemente en playwright.config.ts:
export default defineConfig({
reporter: [['json', { outputFile: 'results.json' }]],
});El archivo debe contener las claves estándar de nivel superior config, suites, errors, stats.
Se incluye un informe de muestra en results.json si solo quieres probar el servidor.
3. Configurar la ruta del informe
Crea un archivo .env en la raíz del repositorio que apunte a ese informe (se recomienda una ruta absoluta):
REPORT_PATH=/absolute/path/to/results.jsonPara usar el ejemplo incluido en su lugar:
REPORT_PATH=/absolute/path/to/playwright-test-analysis-mcp/src/playwright_report_mcp/results.jsonREPORT_PATH se lee en cada llamada a una herramienta, por lo que puedes regenerar el informe sin reiniciar el servidor. Si no está definida, las llamadas a herramientas fallan con REPORT_PATH environment variable is not set.
4. Ejecutar el servidor
Desarrollo interactivo (MCP Inspector)
uv run mcp dev src/playwright_report_mcp/server.pyAbre el MCP Inspector en tu navegador, donde puedes listar e invocar las herramientas manualmente. Requiere npx.
Servidor stdio simple
uv run playwright-report-mcpo, de forma equivalente:
uv run mcp run src/playwright_report_mcp/server.pyHabla el protocolo MCP a través de stdin/stdout. Útil para conectarlo a un cliente MCP, o para una prueba de humo rápida:
printf '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"t","version":"1"}}}\n' \
| uv run playwright-report-mcpDeberías recibir un resultado JSON-RPC con "serverInfo":{"name":"Playwright Report",...}.
Conéctalo a un cliente
Registra el servidor con Claude Desktop:
uv run mcp install src/playwright_report_mcp/server.pyO añádelo manualmente a la configuración de un cliente MCP (p. ej. claude_desktop_config.json):
{
"mcpServers": {
"playwright-report": {
"command": "uv",
"args": [
"--directory",
"/absolute/path/to/playwright-test-analysis-mcp",
"run",
"playwright-report-mcp"
]
}
}
}--directory es importante: hace que uv resuelva el venv de este proyecto y permite que load_dotenv() encuentre el archivo .env.
Herramientas
Herramienta | Descripción |
| Resumen de la última ejecución: |
| Lista de pruebas fallidas, cada una con |
Ejecutar las pruebas
pytest y pytest-asyncio están instalados, pero el repositorio aún no tiene archivos de prueba, por lo que actualmente se recopilan 0 pruebas:
uv run pytestSolución de problemas
Síntoma | Solución |
| Crea |
|
|
| El JSON no es un informe del reportero |
| Instala Node.js para que |
Available Tools
2 toolsget_failuresA
Return failed tests of the latest Playwright test run.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
Output Schema
| Name | Required | Description |
|---|---|---|
| result | Yes |
TDQS
A3.8/5.0
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It conveys read-only behavior via 'Return' and adds the useful 'latest run' scope, but it does not disclose behavior such as how empty results are handled or whether failures are ordered or grouped. These gaps are minor for a simple parameterless read and are partly covered by the output schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
A single sentence that front-loads the action and object and contains no filler. Every word contributes to selection and invocation.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the zero-parameter complexity and the presence of an output schema, the description is nearly complete for correct tool selection and invocation. The only material gap is the lack of any interaction with the sibling get_test_summary, but that is a usage-guidance concern rather than a completeness failure for this simple read.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters, so there is no parameter semantics burden for the description to carry. The baseline of 4 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description states a clear action ('Return'), a precise resource ('failed tests'), and a scoping qualifier ('latest Playwright test run'). It effectively distinguishes itself from get_test_summary by focusing on failures rather than a summary.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description gives no explicit guidance about when to use this tool versus get_test_summary. It implies only that results are scoped to the latest run, but does not state when to prefer failures over a summary or whether get_test_summary is the alternative for successful tests.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_test_summaryA
Return summary of the latest Playwright test run.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
Output Schema
| Name | Required | Description |
|---|---|---|
| flaky | Yes | |
| failed | Yes | |
| passed | Yes | |
| skipped | Yes | |
| start_time | Yes | |
| duration_ms | Yes |
TDQS
A3.5/5.0
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the behavioral disclosure burden. The word 'Return' suggests a read-only operation, but the description does not mention what happens when no test run exists, whether the summary is limited by filters, or any side effects. This is minimally adequate but lacks richer behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
A single, compact sentence that front-loads the action ('Return') and the object ('summary') with no filler or unnecessary detail.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a zero-parameter retrieval tool, the description is sufficiently complete: the resource is identified, the action is clear, and the presence of an output schema covers return-value details. The main gap is lack of usage guidance relative to the sibling, but that is a separate dimension.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters, so the input schema is trivially complete. The description does not need to explain parameter semantics, and the baseline of 4 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('Return') and the resource ('summary of the latest Playwright test run'). It distinguishes from the sibling 'get_failures' by focusing on the overall summary rather than failures, but it does not explicitly name or contrast the sibling.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no guidance on when to use this tool versus 'get_failures' or any other alternative. The description implies it is for retrieving a summary, but it does not state exclusion criteria, prerequisites, or when another tool would be preferable.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
2 tool updates
v0.1.0- First observed
get_failures - First observed
get_test_summary
TDQS
A3.8/5.0
Scored across 2 tools
Disambiguation5/5
get_failures and get_test_summary have clearly distinct purposes: one retrieves only failed tests, the other an aggregate summary. There is no overlap or ambiguity between them.
Naming Consistency5/5
Both tools follow a consistent get_[noun] pattern, making the naming predictable and easy to infer. The convention is uniform across the entire set.
Tool Count3/5
With only two tools, the set is on the thin side and falls into the borderline range. The tools are focused and justified, but the count is minimal for a server that could reasonably include more report-oriented operations.
Completeness4/5
For a server scoped to the latest Playwright test run, get_failures and get_test_summary cover the primary reporting needs. Minor gaps exist—such as retrieving test details or run history—but they do not create dead ends for the core use case.
Maintenance
ActivitySlowing
ResponsivenessNo issues
Related MCP Connectors
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Discover Playwright workflows, start runs, and inspect results in Playrunner Cloud.
Ingest and search LogsLoom logs from coding agents.
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