REQUIRED when modifying any file in packages/playground-ui or packages/playground. Triggers on: React component creation/modification/refactoring, UI changes, new playground features, bug fixes affecting studio UI. Generates Playwright E2E tests that validate PRODUCT BEHAVIOR, not just UI states.
Install
npx skills add mastra-ai/mastra --skill e2e-tests-studionpx skills add mastra-ai/mastra --skill e2e-tests-studio -a claude-code -gnpx skills add mastra-ai/mastra --skill e2e-tests-studio -a codex -ggemini skills install https://github.com/mastra-ai/mastra.git --path .claude/skills/e2e-tests-studiogh skill install mastra-ai/mastra e2e-tests-studiogit clone --depth 1 https://github.com/mastra-ai/mastra /tmp/mastra-ai__mastra
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/mastra-ai__mastra/.claude/skills/e2e-tests-studio ~/.claude/skills/e2e-tests-studio # Claude Code
cp -R /tmp/mastra-ai__mastra/.claude/skills/e2e-tests-studio ~/.agents/skills/e2e-tests-studio # Codex, Cursor, Gemini CLI, Copilot, OpenCode