What problem does it solve? Teams practicing acceptance test-driven development often skip writing failing tests first, or produce inconsistent test scaffolds that developers cannot act on. This Skill generates red-phase acceptance test scaffolds before implementation, complete with fixtures, data factories, mock requirements, and a developer-ready implementation checklist. ## Core Features & Use Cases - Red-Phase Test Generation: Creates E2E, API, and component test scaffolds marked with test.skip() following Given-When-Then structure, so activated tests fail for the right reason before implementation. - Test Infrastructure Scaffolding: Produces faker-based data factories, Playwright fixtures with auto-cleanup, mock requirement documentation, and data-testid attribute lists. - Tri-Modal Workflow: Supports Create, Resume, Validate, and Edit modes with step-file architecture, progress tracking frontmatter, and checklist-based validation. - Use Case: Given a user story with acceptance criteria, the Skill maps criteria to test levels (E2E/API/Component), prioritizes them P0-P3, and outputs an ATDD checklist that hands developers a red-green-refactor roadmap. ## Quick Start Ask the agent to write acceptance tests for a story by saying something like "let's write acceptance tests for the guest checkout story" and provide the story file path.