What problem does it solve? Verifying that a full user journey actually works across API and client layers is hard when repo scripts are stale, coverage gaps are hidden, and environment assumptions go undocumented. This Skill provides a disciplined approach to flow-level verification so you test active product flows rather than outdated scripts. ## Core Features & Use Cases - Journey-Level Validation: Run or design end-to-end flow tests, smoke tests, and synthetic probes that verify users can complete flows, not just that individual requests return 200. - Harness Selection Guidance: Match the right tool to the goal, from the lightweight happy-path-probe.mjs production probe to Playwright MCP for browser journeys and WeChat DevTools MCP for mini-program flows. - Stale Script Detection: Identify scripts like test-e2e-flow.ts that target deprecated flows and treat them as migration candidates instead of proof of coverage. - Use Case: After a risky deployment, use this Skill to define the shortest realistic journey that proves the affected flow still works, run the synthetic probe via workflow_dispatch, and document environment assumptions. ## Quick Start Ask the AI to run an end-to-end smoke test of the signup flow and report any coverage gaps in the existing E2E scripts.