Agent skill · Anthropic
Web App Testing
Officialname: webapp-testing★ 184k (repo)pushed 2026-10-09Apache-2.0SKILL.md on GitHubchecked 2026-10-24
Install
The skills CLI copies the skill into the folder of each agent you pick (Claude Code, Codex, Cursor, Copilot, Gemini CLI, OpenCode, Windsurf...). Add -g for all projects. Needs Node.js 22.20+. docs
npx skills add anthropics/skills --skill webapp-testing
This repo is a plugin marketplace. Inside Claude Code, add it and install the plugin that holds the skill (document-skills, example-skills, claude-api, academy-guide...), or copy only this skill into ~/.claude/skills. docs
/plugin marketplace add anthropics/skills /plugin install <plugin>@anthropic-agent-skills # or only this skill: npx skills add anthropics/skills --skill webapp-testing -a claude-code
Download the skill folder, zip it, then Customize > Skills > + > Create skill > Upload a skill. Code execution must be on (Settings > Capabilities). docs
git clone --depth 1 https://github.com/anthropics/skills.git /tmp/webapp-testing-src cp -r /tmp/webapp-testing-src/skills/webapp-testing ./webapp-testing zip -r webapp-testing.zip webapp-testing
Codex reads skills from .agents/skills in the repo or ~/.agents/skills. Type $ in Codex to use one. docs
npx skills add anthropics/skills --skill webapp-testing -a codex
gh skill (GitHub CLI 2.90+, preview) installs it for Copilot in VS Code, the CLI and the cloud agent. Copilot also reads .github/skills and ~/.copilot/skills. docs
gh skill install anthropics/skills webapp-testing
Cursor reads .cursor/skills, .agents/skills and ~/.cursor/skills (and .claude/skills). It does not install loose skills from a GitHub URL, so copy it in. docs
npx skills add anthropics/skills --skill webapp-testing -a cursor
Installs from the GitHub repo; --path picks this skill out of the repo. Default scope is user (all projects). docs
gemini skills install https://github.com/anthropics/skills.git --path skills/webapp-testing
OpenCode reads .opencode/skills, ~/.config/opencode/skills and the Claude and .agents folders. docs
npx skills add anthropics/skills --skill webapp-testing -a opencode
Windsurf (now Devin Desktop) reads .devin/skills, .windsurf/skills and ~/.codeium/windsurf/skills. docs
npx skills add anthropics/skills --skill webapp-testing -a windsurf
Pairs with the Playwright MCP server: the server gives the agent the tools, the skill teaches it how to use them.
More from anthropics/skills
- Canvas Design: Produces posters and static artwork as PNG or PDF files, guided by a written design philosophy.
- Claude API: Reference for building on the Claude API and Anthropic SDKs: models, tool use, streaming, caching, pricing.
- Doc Co-authoring: Walks you through drafting specs, proposals and design docs step by step with Claude.
- Word Documents (DOCX): Creates, reads and edits Word .docx files, including templates, tracked changes and formatting.
- Frontend Design: Steers UI work toward deliberate visual direction and typography instead of generic template looks.
- MCP Server Builder: Guide for designing and building Model Context Protocol servers that wrap external APIs as tools.
- PDF: Extracts text and tables, merges, splits, fills forms and creates PDF files.
- PowerPoint (PPTX): Builds, reads and edits PowerPoint decks and templates, including layouts and speaker notes.
- Skill Creator: Helps write new skills, refine existing ones and test how well they trigger and perform.
- Slack GIF Creator: Makes small animated GIFs sized and validated for Slack's emoji and message limits.
- Web Artifacts Builder: Builds multi-component HTML artifacts with React, Tailwind and shadcn/ui, bundled into one file.
- Excel Spreadsheets (XLSX): Opens, cleans, edits and creates spreadsheets (.xlsx, .csv), including formulas and charts.
Other testing & qa skills
- Agent Browser · Vercel
- Playwright Browser Automation · OpenAI
- Playwright CLI · Microsoft (Playwright)
- Property-Based Testing · Trail of Bits
- Analyze .NET Performance · Microsoft (.NET)
- Browserbase Browser · Browserbase
- Adversarial UI Test · Browserbase
- Find Bugs · Sentry
FAQ
How do I install the webapp-testing skill?+
Run npx skills add anthropics/skills --skill webapp-testing and pick your agents, or use the tab for your agent above. In Claude Code the skill ends up in ~/.claude/skills/webapp-testing/SKILL.md.
Which agents can use Web App Testing?+
Any agent that reads the Agent Skills format (SKILL.md): Claude Code, the Claude apps, Codex, GitHub Copilot, Cursor, Gemini CLI, OpenCode, Windsurf and more.
Who maintains Web App Testing?+
Anthropic, the company or project behind it, in the anthropics/skills repo on GitHub, last pushed 2026-10-09.
Read a skill's SKILL.md and scripts before you install it: skills aren't verified by any agent vendor. All agent skills · MCP servers