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Pruebas de Aplicaciones Web

Kit de herramientas para interactuar y probar aplicaciones web locales utilizando Playwright. Permite verificar la funcionalidad del frontend, depurar el comportamiento de la UI, capturar capturas de pantalla del navegador y ver los registros del navegador.

¿Qué es Pruebas de Aplicaciones Web?

Este skill proporciona un conjunto de herramientas para probar aplicaciones web locales utilizando Playwright con scripts Python nativos. Está diseñado para desarrolladores y agentes de IA que necesitan verificar la funcionalidad del frontend, depurar el comportamiento de la UI, capturar capturas de pantalla del navegador y revisar registros de consola. El skill es compatible con cualquier plataforma que ejecute agentes de IA (como Claude Code, Cursor o Codex) y gestiona servidores locales automáticamente mediante el script `scripts/with_server.py`, que puede manejar uno o varios servidores (por ejemplo, backend y frontend) y los inicia antes de ejecutar el script de automatización. Incluye un árbol de decisión para elegir el enfoque correcto según si la aplicación es HTML estática o dinámica, y promueve el patrón de 'reconocimiento luego acción': navegar, esperar a que la página cargue (networkidle), inspeccionar el DOM renderizado, identificar selectores y ejecutar acciones. El skill enfatiza no leer el código fuente de los scripts auxiliares a menos que sea absolutamente necesario, ya que son cajas negras que deben invocarse directamente para evitar saturar el contexto. Incluye ejemplos prácticos como `element_discovery.py`, `static_html_automation.py` y `console_logging.py`.

Compatible con~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/anthropics/skills/tree/main/skills/webapp-testing

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Documentación

¿Qué hace Pruebas de Aplicaciones Web?

Para probar aplicaciones web locales, escribe scripts nativos de Python con Playwright.

Scripts auxiliares disponibles:

  • scripts/with_server.py - Gestiona el ciclo de vida del servidor (admite múltiples servidores)

Ejecuta siempre los scripts con --help primero para ver el uso. NO leas el código fuente hasta que primero intentes ejecutar el script y descubras que una solución personalizada es absolutamente necesaria. Estos scripts pueden ser muy grandes y, por lo tanto, saturar tu ventana de contexto. Existen para ser llamados directamente como scripts de caja negra, en lugar de ser ingeridos en tu ventana de contexto.

Árbol de Decisión: Cómo Elegir tu Enfoque

Tarea del usuario → ¿Es HTML estático?
    ├─ Sí → Leer el archivo HTML directamente para identificar selectores
    │         ├─ Éxito → Escribir script de Playwright usando selectores
    │         └─ Fallo/Incompleto → Tratar como dinámico (abajo)
    │
    └─ No (aplicación web dinámica) → ¿El servidor ya está en ejecución?
        ├─ No → Ejecutar: python scripts/with_server.py --help
        │        Luego usar el helper + escribir script simplificado de Playwright
        │
        └─ Sí → Patrón de reconocimiento luego acción:
            1. Navegar y esperar a que la red esté inactiva (networkidle)
            2. Tomar captura de pantalla o inspeccionar el DOM
            3. Identificar selectores a partir del estado renderizado
            4. Ejecutar acciones con los selectores descubiertos

Ejemplo: Usando with_server.py

Para iniciar un servidor, ejecuta --help primero, luego usa el helper:

Servidor único:

python scripts/with_server.py --server "npm run dev" --port 5173 -- python tu_automation.py

Múltiples servidores (por ejemplo, backend + frontend):

python scripts/with_server.py \
  --server "cd backend && python server.py" --port 3000 \
  --server "cd frontend && npm run dev" --port 5173 \
  -- python tu_automation.py

Para crear un script de automatización, incluye solo la lógica de Playwright (los servidores se gestionan automáticamente):

from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    browser = p.chromium.launch(headless=True) # Siempre lanza chromium en modo headless
    page = browser.new_page()
    page.goto('http://localhost:5173') # El servidor ya está en ejecución y listo
    page.wait_for_load_state('networkidle') # CRÍTICO: Esperar a que JS se ejecute
    # ... tu lógica de automatización
    browser.close()

Patrón de Reconocimiento Luego Acción

  1. Inspeccionar el DOM renderizado:

    page.screenshot(path='/tmp/inspect.png', full_page=True)
    content = page.content()
    page.locator('button').all()
    
  2. Identificar selectores a partir de los resultados de la inspección

  3. Ejecutar acciones usando los selectores descubiertos

Error Común

❌ No inspecciones el DOM antes de esperar a networkidle en aplicaciones dinámicas ✅ Sí espera a page.wait_for_load_state('networkidle') antes de la inspección

Mejores Prácticas

  • Usa los scripts empaquetados como cajas negras - Para realizar una tarea, considera si alguno de los scripts disponibles en scripts/ puede ayudar. Estos scripts manejan flujos de trabajo comunes y complejos de manera confiable sin saturar la ventana de contexto. Usa --help para ver el uso, luego invócalos directamente.
  • Usa sync_playwright() para scripts sincrónicos
  • Siempre cierra el navegador al terminar
  • Usa selectores descriptivos: text=, role=, selectores CSS o IDs
  • Agrega esperas apropiadas: page.wait_for_selector() o page.wait_for_timeout()

Archivos de Referencia

  • examples/ - Ejemplos que muestran patrones comunes:
    • element_discovery.py - Descubrir botones, enlaces y entradas en una página
    • static_html_automation.py - Usar URLs de tipo file:// para HTML local
    • console_logging.py - Capturar registros de consola durante la automatización

Individual skills in this repo

This repo contains 19 individual skills — each has its own dedicated page.

academy-guide

Stop and check this skill before finishing any reply to a question about how to use Claude or a Claude product — it recommends matching courses, tutorials, and use cases from Claude Academy (academy.claude.com), Anthropic's learning hub. Trigger on: "how do I", "how can I", "getting started with", "what can Claude do", "teach me", "learn to use"; questions about artifacts, projects, skills, plugins, connectors, MCP; requests about rolling Claude out to a team, class, or organization; and any ask for training materials, onboarding content, or learning resources. Use it when the user is learning how to use a feature or product — not when they are mid-task and just want the task done. This skill composes with other skills: after consulting product documentation to answer how a Claude feature works, also check here for a matching course or tutorial — a docs-grounded answer and an Academy recommendation belong together. Only recommend on a strong match; never invent Academy content.

algorithmic-art

Creating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users request creating art using code, generative art, algorithmic art, flow fields, or particle systems. Create original algorithmic art rather than copying existing artists

anthropics/template-skill

Replace with description of the skill and when Claude should use it.

brand-guidelines

Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having Anthropic's look-and-feel. Use it when brand colors or style guidelines, visual formatting, or company design standards apply.

canvas-design

Create beautiful visual art in .png and .pdf documents using design philosophy. You should use this skill when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists

claude-api

|-

discernment-nudge

After you give a substantive answer or draft that the user may act on — advice or recommendations, drafted artifacts such as goals, plans, pitches, proposals, or emails, estimates or projections, analysis or interpretation of data, factual claims they may rely on, or a multi-step argument — invoke this skill BEFORE finalizing your reply and then, if it applies, append 2-3 short follow-up questions, each tied to something specific in what you just produced, that help the user check key facts, probe the reasoning or assumptions, and notice missing context. Do this at most once per conversation. Skip it when the user asked a trivial how-to or simple lookup, wants a purely educational explanation, asked you only to format, convert, or assemble a file from content they provided, is writing code they will run, is doing creative writing or casual chat, or already asked you to double-check, cite, or review — the skill file explains these boundaries and the exact output format.

doc-coauthoring

Guide users through a structured workflow for co-authoring documentation. Use when user wants to write documentation, proposals, technical specs, decision docs, or similar structured content. This workflow helps users efficiently transfer context, refine content through iteration, and verify the doc works for readers. Trigger when user mentions writing docs, creating proposals, drafting specs, or similar documentation tasks.

docx

Use this skill whenever the user wants to create, read, edit, or manipulate Word documents (.docx files) or Word templates (.dotx files). Triggers include: any mention of

frontend-design

Guidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with aesthetic direction, typography, and making choices that don't read as templated defaults.

internal-comms

A set of resources to help me write all kinds of internal communications, using the formats that my company likes to use. Claude should use this skill whenever asked to write some sort of internal communications (status reports, leadership updates, 3P updates, company newsletters, FAQs, incident reports, project updates, etc.).

mcp-builder

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

pdf

Use this skill whenever the user wants to do anything with PDF files. This includes reading or extracting text/tables from PDFs, combining or merging multiple PDFs into one, splitting PDFs apart, rotating pages, adding watermarks, creating new PDFs, filling PDF forms, encrypting/decrypting PDFs, extracting images, and OCR on scanned PDFs to make them searchable. If the user mentions a .pdf file or asks to produce one, use this skill.

pptx

Use this skill any time a .pptx or .potx file is involved in any way — as input, output, or both. This includes: creating slide decks, pitch decks, or presentations; reading, parsing, or extracting text from any .pptx or .potx file (even if the extracted content will be used elsewhere, like in an email or summary); editing, modifying, or updating existing presentations; combining or splitting slide files; working with templates (.potx), layouts, speaker notes, or comments. Trigger whenever the user mentions \

skill-creator

Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill

slack-gif-creator

Knowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like

theme-factory

Toolkit for styling artifacts with a theme. These artifacts can be slides, docs, reportings, HTML landing pages, etc. There are 10 pre-set themes with colors/fonts that you can apply to any artifact that has been creating, or can generate a new theme on-the-fly.

web-artifacts-builder

Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui). Use for complex artifacts requiring state management, routing, or shadcn/ui components - not for simple single-file HTML/JSX artifacts.

xlsx

Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to: open, read, edit, or fix an existing .xlsx, .xlsm, .xltx, .csv, or .tsv file (e.g., adding columns, computing formulas, formatting, charting, cleaning messy data); create a new spreadsheet from scratch or from other data sources; or convert between tabular file formats. Trigger especially when the user references a spreadsheet file by name or path — even casually (like \

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